speaker surround

Abstract

Speaker surround (100), featuring an inner mounting section (110) for coupling to a diaphragm (300), an outer mounting section (120) for coupling to a loudspeaker basket and / or loudspeaker frame (310), and a rolling section (130) extending between the inner fastening section (110) and the outer fastening section (120), wherein a radial cross-sectional profile of the rolling section (130) changes in a circumferential direction, preferably continuously, between at least a first cross-sectional profile and a second cross-sectional profile that differs from the first cross-sectional profile, wherein a difference of a developed arc length (L) of the first cross-sectional profile and the second cross-sectional profile is a maximum of 50%, wherein The first cross-sectional profile and the second cross-sectional profile transition seamlessly into each other.

Description

[0001] The invention relates to a loudspeaker surround comprising an inner mounting section for coupling to a diaphragm, an outer mounting section for coupling to a loudspeaker basket and / or loudspeaker frame, and a rolling section extending between the inner mounting section and the outer mounting section.

[0002] Electrodynamic loudspeakers typically consist of a diaphragm, a drive unit with a voice coil, and at least one suspension element. The voice coil is usually located in a magnetic gap and drives the diaphragm axially. The diaphragm may also be fitted with a dust cap. The loudspeaker system is mounted in a basket / frame or directly in a baffle.

[0003] The surround connects the diaphragm to the basket / frame and allows reciprocal axial movement of the diaphragm, while simultaneously providing a seal between the front and rear chambers. Often, an additional suspension element (spider) is provided to improve axial guidance and reduce tilting movements of the diaphragm assembly, which could otherwise lead to distortion or, in extreme cases, to the voice coil rubbing in the air gap.

[0004] Surrounds are often made of elastic materials such as rubber, impregnated fabric, or foam. These materials can contribute to damping edge and bending vibrations of the diaphragm. At the same time, the force-displacement behavior of a surround, especially with viscoelastic materials, can be amplitude- and frequency-dependent as well as non-linear, which can contribute to distortion.

[0005] The electroacoustic sensitivity of a loudspeaker, all other parameters being equal, depends primarily on the moving mass (Mms) and the effective diaphragm area (Sd). A larger moving mass and / or a smaller effective diaphragm area typically result in lower sensitivity. Since surround materials often have a higher density than typical diaphragm materials, and a wide surround reduces the effective diaphragm area, a compact surround design is advantageous in many applications.

[0006] In the prior art, surround profiles are known that are designed as rolled surrounds with a substantially semicircular cross-section. For a given outer diameter of the diaphragm, increasing the roll width can reduce the effective diaphragm area and simultaneously increase the moving mass. Furthermore, at large excursions, depending on the material and geometry, undesirable self-deformations such as wrinkling or buckling can occur. Additionally, in loudspeakers housed in enclosures, pressure differences can arise between the front and rear compartments, which influence the mechanical behavior of the surround.

[0007] It is therefore an object of the invention to create a loudspeaker surround and a loudspeaker with a loudspeaker surround with improved acoustic properties.

[0008] This problem is solved by the subject matter of the independent claims.

[0009] According to the invention, the loudspeaker surround is designed for installation in a loudspeaker, preferably an electrodynamic one, and / or can be used for this purpose. For example, the loudspeaker surround is designed for the elastic suspension of a diaphragm relative to a basket / frame and / or can be used for this purpose.

[0010] In the context of this description, the term "circumferential direction" refers to the direction along the circumference of the groove. A "circumferential position" refers to a position along the circumferential direction, in particular definable by a circumferential angle or a circumferential arc length. A "radial cross-section" refers to a section in a plane that encompasses a radial direction of the groove and the axial direction of movement of the membrane.

[0011] A “developed arc length L” refers to the length of a cross-sectional profile of a rolling section running along a profile contour between an inner transition point and an outer transition point.

[0012] The inner or outer transition point can be defined as the respective point where the profile contour of the rolling section transitions into the inner or outer fastening section, particularly where the contour changes from the curved design of the rolling section to a substantially straight or planar section of the respective fastening section. The developed arc length L is measured along the profile contour between these points.

[0013] The term "kink-free" refers to a transition without a jump in the tangent line (tangentially continuous). The term "curvature-continuous" refers to a transition where the curvature is also continuous. The term "piecewise linear" describes a change in a geometric parameter along the circumference in segments with a constant gradient.

[0014] The loudspeaker surround has an inner mounting section for coupling to a diaphragm, an outer mounting section for coupling to a loudspeaker basket and / or loudspeaker frame, and a rolling section extending between the inner mounting section and the outer mounting section.

[0015] Preferably, the rolling section comprises or consists of an elastomer material, e.g. EPDM, NBR, SBR, IIR and / or NR.

[0016] A radial cross-sectional profile of the rolling section changes in a circumferential direction, preferably continuously, between at least a first cross-sectional profile and a second cross-sectional profile that differs from the first cross-sectional profile.

[0017] For example, the first cross-sectional profile is located at a first circumferential position and the second cross-sectional profile is located at a second circumferential position.

[0018] Preferably, exactly two cross-sectional profiles are provided. Alternatively, a third, fourth, fifth, etc. cross-sectional profile is also conceivable. All cross-sectional profiles can, for example, differ from each other.

[0019] Preferably, the distance between adjacent, e.g., upper, vertices of the cross-sectional profiles is constant. Alternatively, the distance between the vertices can vary.

[0020] For example, the different cross-sectional profiles can alternate multiple times in the circumferential direction, for instance at least or exactly two, three, four, five, six, seven, eight, nine, or ten times. The number of alternations is essentially arbitrary and can, for example, be at least or exactly 15, 20, 30, 40, 50, or more.

[0021] A continuous alternation is therefore possible. Preferably, several sections with the first cross-sectional profile and several sections with the second cross-sectional profile are provided.

[0022] Preferably, the cross-sectional profile is constantly changing. For example, the cross-sectional profile is not constant along the circumferential direction over any circumferential segment with a non-zero circumferential extent.

[0023] By varying the cross-sectional profile in the circumferential direction, the strain of the material in the rolling section can be distributed more favorably around the circumference, thereby reducing local over-extension. This contributes to a more uniform force-displacement behavior and improved linearity.

[0024] The difference in the developed arc length of the first cross-sectional profile and the second cross-sectional profile, and possibly other cross-sectional profiles, is a maximum of 50%.

[0025] Preferably, the difference can be a maximum of or exactly 50%, 49%, 48%, 47%, 46%, 45%, 44%, 43%, 42%, 41%, 40%, 39%, 38%, 37%, 36%, 35%, 34%, 33%, 32%, 31%, 30%, 29%, 28%, 27%, 26%, 25%, 24%, 23%, 22%, 21%, 20%, 19%, 18%, 17%, 16%, 15%, 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.75%, 0.5%, 0.4%, 0.3%, 0.25%, 0.2%, 0.1%, or 0%.

[0026] The developed arc length L of the cross-sectional profile is essentially the same for different circumferential positions. This ensures that a comparable material length is available despite varying profile parameters, allowing the rib to "start" more uniformly around the circumference and reducing local early stiffening of individual circumferential sections. The smaller the difference, the greater the positive properties.

[0027] The first cross-sectional profile, the second cross-sectional profile, and any further cross-sectional profiles, transition seamlessly into one another.

[0028] Preferably, the change in the cross-sectional profile in the circumferential direction is linear, at least in sections.

[0029] For example, the change in the cross-sectional profile in the circumferential direction is formed without radially extending folds.

[0030] The transition of the cross-sectional profile can be designed without kinks in the circumferential direction.

[0031] Preferably, the transition of the cross-sectional profile in the circumferential direction is designed to be continuously curvatured.

[0032] This avoids abrupt changes in local stiffness, which can contribute to more stable and reproducible deformation behavior, especially under varying pressure differences between the front and back surfaces. This can improve resistance to undesired self-deformations (e.g., buckling) and the resulting nonlinearities, without requiring a significant increase in material thickness.

[0033] Overall, according to the invention, a loudspeaker surround is provided which, in a compact design, enables a large linear excursion while simultaneously reducing local overextensions and the associated nonlinearities.

[0034] The mechanical behavior is more stable and remains more uniform even under changing pressure differences between the front and rear spaces (e.g. in a loudspeaker enclosure), without requiring stiffening through additional rib or corrugation structures recurring along the circumferential direction.

[0035] Furthermore, the formation of pronounced, narrowband resonance effects in the upper frequency range, which can be promoted by excited bending vibrations of the diaphragm and / or the surround, can be reduced.

[0036] Furthermore, the acoustic influence of the surround on the radiated sound power is reduced, particularly with regard to edge diffraction and / or interference effects in the area of ​​the surround structure.

[0037] Furthermore, the circumferentially varying geometry of the rolling section can promote a splitting or distribution of natural and edge resonances. In particular, resonance effects, which can lead to pronounced, narrowband peaks and dips in the frequency response with a completely rotationally symmetrical geometry, can be distributed over a wider frequency range in preferred embodiments, thus reducing the intensity of individual resonance peaks.

[0038] In numerical simulations (FEM) of a 6.5" loudspeaker driver with a 38 mm voice coil, where the diaphragm, voice coil, spider and an identical drive model (as a lumped model) were used and only the geometry of the surround was varied, a reduced ripple in the simulated sound pressure frequency response was observed compared to a rotationally symmetric high-roll surround, particularly in the range of about 1.5 kHz to 5 kHz, while outside this range the responses were largely comparable.

[0039] Furthermore, a compact surround design allows for a relatively larger effective diaphragm area. This reduces the relative acoustic contribution of the surround to sound radiation, which can lessen the perception of surround resonances.

[0040] Additionally, a smaller effective extent of the corrugation structure and / or a non-rotationally symmetric design of the corrugation geometry can reduce the formation of edge diffraction and interference effects in the membrane / corrugation transition area or make their spectral signature less pronounced.

[0041] Further developments of the invention can also be found in the dependent claims, the description and the accompanying drawings.

[0042] According to one embodiment, the loudspeaker surround is ring-shaped.

[0043] For example, the speaker surround can be used in a cone speaker.

[0044] In principle, the shape of the loudspeaker surround is arbitrary, e.g. oval or rectangular.

[0045] According to a further embodiment, the first cross-sectional profile and the second cross-sectional profile each have an upper segment with at least substantially constant curvature and two flank segments, each of which has at least substantially constant curvature and / or is at least substantially straight.

[0046] Preferably, the upper segment transitions tangentially into the flank segments at transition points.

[0047] According to another embodiment, the flank segments are asymmetrically formed with respect to an axis of symmetry passing through the center point of a radius of curvature.

[0048] Alternatively, the flank segments can be mirror-symmetrical. For example, the vertices can be arranged in the same position in the radial direction.

[0049] In both cases, the flank segments can be arranged perpendicular to the axis of symmetry or extend obliquely. The cross-sectional profiles can be inclined circumferentially relative to the axial direction by an angle β. The radial cutting planes can be tilted relative to the axis. The structures of the cross-sectional profiles, e.g., V-shaped or U-shaped, can also be inclined.

[0050] According to another embodiment, the first cross-sectional profile and the second cross-sectional profile differ with respect to at least one geometric parameter of the upper segment and / or at least one flank segment.

[0051] The geometric parameter can be, for example, a radius of curvature of the upper segment, a radius of curvature of at least one flank segment, a roll height, a roll width, a thickness, a flank angle and / or an inner or outer transition radius.

[0052] According to another embodiment, an inner transition radius and / or an outer transition radius is different from zero or at least substantially equal to zero.

[0053] According to a further embodiment, at least one geometric parameter of the cross-sectional profile can be monotonically changed in the circumferential direction between the first circumferential position and the second circumferential position.

[0054] According to another embodiment, the cross-sectional profile corresponds to a different cross-sectional profile at at least three different circumferential positions.

[0055] According to another embodiment, the different cross-sectional profiles recur in a predetermined sequence in the circumferential direction.

[0056] According to another embodiment, the circumferential positions of the different cross-sectional profiles are arranged at equal or unequal angular intervals.

[0057] According to another embodiment, the first cross-sectional profile is V-shaped and the second cross-sectional profile is U-shaped.

[0058] These structures exhibit high stability. A seamless transition between these structures is also possible.

[0059] According to another embodiment, the roll width of the first cross-sectional profile and / or the second cross-sectional profile is essentially constant in the circumferential direction, while the roll height of the first cross-sectional profile and / or the second cross-sectional profile varies in the circumferential direction.

[0060] For example, the rolling height in the circumferential direction can vary between a minimum value and a maximum value, where the maximum value is at least 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 25%, 30%, 40% or 50% above the minimum value.

[0061] According to another embodiment, the rolling height of the first cross-sectional profile and / or the second cross-sectional profile is greater than half the rolling width of the first cross-sectional profile and / or the second cross-sectional profile.

[0062] According to another embodiment, the radius of curvature R1 of the upper segment is smaller than at least one of the radii of curvature R2, R3 of the flank segments.

[0063] According to another embodiment, R2 ≥ 5·R1 and / or R3 ≥ 5·R1.

[0064] According to another embodiment, the flank segments have different radii of curvature, in particular R2 ≠ R3.

[0065] According to another embodiment, the first cross-sectional profile differs from the second cross-sectional profile in that the radius of curvature of the upper segment is larger in the first cross-sectional profile than in the second cross-sectional profile.

[0066] According to a further embodiment, the first cross-sectional profile differs from the second cross-sectional profile in that at least one of the radii of curvature of the flank segments is larger or smaller in the first cross-sectional profile than in the second cross-sectional profile.

[0067] According to a further embodiment, at least one of the flank segments is essentially straight in at least one cross-sectional profile.

[0068] According to another embodiment, the upper segment is designed as a circular arc section with essentially constant curvature.

[0069] The flank segments can each be designed as a circular arc section with essentially constant curvature and / or as an essentially straight section.

[0070] According to another embodiment, the thickness of the first cross-sectional profile and / or the second cross-sectional profile varies in the circumferential direction.

[0071] For example, the thickness in the effective area of ​​the rolling section can vary in the circumferential direction or alternatively be constant.

[0072] Preferably, the thickness of the rolling section varies along the developed arc length between the inner transition point and the outer transition point.

[0073] Finally, the invention relates to a loudspeaker and / or a passive diaphragm device with a loudspeaker surround according to the invention and a diaphragm, preferably a passive diaphragm.

[0074] According to one embodiment, the rolling section is directed outwards relative to a mounting plane of the loudspeaker.

[0075] According to another embodiment, the rolling section is directed inwards relative to a mounting plane of the loudspeaker.

[0076] According to another embodiment, the rolling section is directed inwards section by section and outwards section by section along the circumferential direction.

[0077] All aspects, embodiments, and features of the invention described herein can be combined with one another, preferably also independently of the specific embodiment in which they are mentioned. Preferably, all subject matter of the dependent claims can be combined with each other and with any subject matter of the independent claims.

[0078] It is generally noted that terms like "ein" (a) and "eine" (a / an) do not necessarily mean "exactly one" or "exactly one," although this is also possible. The terms "ein" and "eine" can therefore be understood as "at least one" or "exactly one." The use of the singular preferably includes the possibility of the components being plural, and vice versa.

[0079] It is noted that "vorzugsweise" and "bevorzugt" can be translated as "preferably" in English. A feature introduced by "vorzugsweise" or "bevorzugt" is purely optional, can be omitted, and does not constitute a limitation, for example, of claims.

[0080] The invention is described below by way of example with reference to the drawings. The drawings show: Fig. 1 a perspective view of a loudspeaker surround, Fig. 2 a top view of the loudspeaker surround with two offset cutting positions AA and BB and an offset angle α, Fig. 3 Sectional views of the loudspeaker surround along section positions AA and BB; detail areas A and B refer to enlarged profile views according to Fig. 4 or Fig. 5, Fig. 4 an enlarged representation of a first cross-sectional profile (Detail A) with an upper segment and flank segments, Fig. 5 an enlarged representation of a second cross-sectional profile (Detail B) with an upper segment and flank segments, Fig. 6 a definition of a developed arc length L of the cross-sectional profile between an inner transition point and an outer transition point, Fig. 7 a developed representation of the loudspeaker surround, wherein the cross-sectional profile varies continuously along the circumferential direction, Fig. 8 a cross-sectional profile of an alternative embodiment, and Fig. 9 a schematic sectional view of a loudspeaker with a diaphragm, a basket / frame and a loudspeaker surround according to an embodiment of the invention, as well as a voice coil arranged on a voice coil carrier in the area of ​​a magnetic gap / air gap, and a spider.

[0081] It should first be noted that the embodiments shown are purely exemplary. Individual features can be implemented not only in the combination shown, but also individually or in other technically feasible combinations. For example, the features of one embodiment can be combined with features of another embodiment in any way. The number, length, width, shape, and / or position of the cross-sectional profiles are, in principle, arbitrary.

[0082] If a figure contains a reference numeral that is not explained in the immediately associated descriptive text, reference is made to the corresponding preceding or subsequent explanations in the figure description. Thus, the same reference numerals are used for identical or comparable components in the figures and are not explained again.

[0083] The in Fig. The loudspeaker surround shown, 100, can, for example, be ring-shaped.

[0084] The loudspeaker surround 100 has an inner mounting section 110 for coupling to a diaphragm and an outer mounting section 120 for coupling to a basket / frame. A rolling section 130 is arranged between the inner mounting section 110 and the outer mounting section 120, which allows elastic deflection of the diaphragm in the axial direction.

[0085] Fig. 2 and Fig. Figure 3 shows two section positions AA and BB at different circumferential positions. The cross-sectional profiles occurring at these circumferential positions differ by at least one geometric parameter, for example, by a radius of curvature R1 of an upper segment (200), by a radius of curvature R2 or R3 of a flank segment (180 or 190, respectively), by a roll height H, or by a flank angle. Between the circumferential positions, the cross-sectional profile changes continuously along the circumferential direction, as shown in Fig. Figure 7 is shown schematically. Transition areas can be labelled with 160.

[0086] Fig. Figure 4 shows a first cross-sectional profile (Detail A) with an upper segment 200 and flank segments 180, 190. The upper segment 200 is preferably designed as a circular arc segment with a substantially constant curvature. The flank segments 180, 190 each have a substantially constant curvature R2, R3 and can alternatively or additionally be substantially straight. At transition points, the upper segment 200 transitions tangentially into the flank segments 180, 190. Transitions to the fastening sections can have inner and outer transition radii Rf,i and Rf,o, respectively, or can be designed essentially without a transition radius.

[0087] Fig. Figure 5 shows a second cross-sectional profile (Detail B) that differs from the first cross-sectional profile by at least one of the aforementioned geometric parameters. In a preferred embodiment, the developed arc length L of the cross-sectional profile is between 210 and 220 (see Figure 5). Fig. 6) for the first and second cross-sectional profiles essentially the same, so that a comparable material length is available for changing profile geometry and local overstretching is reduced.

[0088] In alternative embodiments, the change in the cross-sectional profile along the circumferential direction can be linear incrementally. Furthermore, the thickness T of the rolled section 130 in the effective area can be essentially constant or vary in the circumferential direction and / or along a developed arc length L.

[0089] In further embodiments, the transition 160 can be designed such that the cross-sectional profile changes continuously in the circumferential direction and is not constant over any circumferential section with a non-zero circumferential extent, but only corresponds to a defined cross-sectional profile at individual circumferential positions.

[0090] In further embodiments, the roll width W can be essentially constant in the circumferential direction, while the roll height H varies in the circumferential direction, wherein the roll height H varies, for example, between a minimum value and a maximum value, and the maximum value is preferably at least 20% higher than the minimum value. For at least one of the cross-sectional profiles, H > 0.5·W can also apply. Furthermore, the developed arc length L of the cross-sectional profiles (between the inner transition point 210 and the outer transition point 220) can differ from each other, for example, by no more than 10%.

[0091] In preferred embodiments, the radius of curvature R1 of the upper segment 200 differs between the first and second cross-sectional profiles, with R1 being larger for the first cross-sectional profile than for the second. Additionally or alternatively, a radius of curvature R2 and / or R3 of at least one of the flank segments 180, 190 can be larger or smaller for the first cross-sectional profile than for the second. In preferred embodiments, R1 is smaller than at least one of the radii of curvature R2 and / or R3, where, for example, R2 ≥ 5·R1 and / or R3 ≥ 5·R1 and / or R2 ≠ R3. At least one geometric parameter (for example, R1, R2, R3, H, or a flank angle) can change monotonically along the circumferential direction between the first and second circumferential positions.

[0092] The cross-sectional profile can correspond to a different cross-sectional profile at at least three different circumferential positions, whereby these profiles can recur in a predetermined sequence and / or the circumferential positions can be arranged at equal or unequal angular intervals. The flank segments 180, 190 can be mirror-symmetrical or asymmetrical with respect to an axis of symmetry passing through the center of the radius of curvature R1. The transition in the circumferential direction can also be formed without radially extending folds. The rolled section 130 can be made of an elastomer material, in particular EPDM, NBR, SBR, IIR or NR.

[0093] The rolling section 130 can be configured to face outwards or inwards with respect to a mounting plane of the loudspeaker. Alternatively, different circumferential sections can be configured to face inwards in some sections and outwards in others.

[0094] The loudspeaker surround 100 can be used, for example, in a passive membrane device, especially for the elastic mounting of a passive membrane relative to a frame.

[0095] Fig. Figure 9 schematically shows the application of the loudspeaker surround 100 in a loudspeaker, wherein the inner mounting section 110 is coupled to a diaphragm 300 and the outer mounting section 120 to a basket / frame 310. The diaphragm 300 is driven via a voice coil 320 with a voice coil former 330 in the area of ​​a magnetic gap / air gap 340 and additionally guided by means of a spider 350.

[0096] A loudspeaker surround 100, e.g. ring-shaped, is thus provided. This has an inner mounting section 110 for coupling to the diaphragm 300, an outer mounting section 120 for coupling to the basket / frame 310, and a rolling section 130 arranged between the inner and outer mounting sections 110, 120.

[0097] The rolling section 130 has a cross-sectional profile in a radial cross-section that changes in the circumferential direction.

[0098] The cross-sectional profile corresponds to a first cross-sectional profile at at least one first circumferential position and to a second cross-sectional profile at at least one second circumferential position.

[0099] The cross-sectional profile changes continuously along at least one circumferential section between the at least one first circumferential position and the at least one second circumferential position.

[0100] The developed arc length of the cross-sectional profile of the rolling section 130 is essentially the same along the profile contour between an inner transition point 210 and an outer transition point 220 for the first cross-sectional profile and the second cross-sectional profile.

[0101] The first cross-sectional profile differs from the second cross-sectional profile by at least one geometric parameter.

[0102] Each of the first and second cross-sectional profiles can be formed by several profile segments, comprising an upper segment 200 with substantially constant curvature and two flank segments 180, 190, each having substantially constant curvature and / or being substantially straight.

[0103] The upper segment 200 transitions tangentially into the flank segments 180, 190 at transition points.

[0104] The transition of the cross-sectional profile is free of kinks in the circumferential direction, preferably with continuous curvature. Reference symbol list 100 speaker surrounds 110 Inner fastening section 120 Outer fastening section 130 Roll section 160 Transition area 180 First flank segment 190 Second flank segment 200 Upper Segment 210 Inner transition point 220 Outer transition point 300 membrane 310 basket / frame 320 voice coil 330 voice coil formers 340 Magnetic gap / air gap 350 Centering spider α Offset angle H Rolling height W Roll width T Thickness L Developed arc length R1 Radius of curvature of the upper segment R2 radius of curvature of the first flank segment R3 radius of curvature of the second flank segment Rf,i Inner transition radius Rf,o Outer transition radius

Claims

[1] Loudspeaker surround (100), having an inner mounting section (110) for coupling to a diaphragm (300), an outer mounting section (120) for coupling to a loudspeaker basket and / or loudspeaker frame (310), and a rolling section (130) extending between the inner fastening section (110) and the outer fastening section (120), wherein a radial cross-sectional profile of the rolling section (130) changes in a circumferential direction, preferably continuously, between at least a first cross-sectional profile and a second cross-sectional profile that differs from the first cross-sectional profile, wherein a difference of a developed arc length (L) of the first cross-sectional profile and the second cross-sectional profile is a maximum of 50%, wherein The first cross-sectional profile and the second cross-sectional profile transition seamlessly into each other. [2] Loudspeaker surround (100) according to claim 1, characterized by , that the loudspeaker surround (100) is ring-shaped. [3] Loudspeaker surround (100) according to claim 1 or 2, characterized by , that the first cross-sectional profile and the second cross-sectional profile each have an upper segment (200) with at least substantially constant curvature and two flank segments (180, 190) which each have at least substantially constant curvature and / or are at least substantially straight. [4] Loudspeaker surround (100) according to claim 3, characterized by , that the flank segments (180, 190) are asymmetrically formed with respect to an axis of symmetry passing through a center point of a radius of curvature (R1). [5] Loudspeaker surround (100) according to claim 3 or 4, characterized by, that the first cross-sectional profile and the second cross-sectional profile differ with respect to at least one geometric parameter of the upper segment (200) and / or at least one flank segment (180, 190). [6] Loudspeaker surround (100) according to any one of the preceding claims, characterized by that the first cross-sectional profile is V-shaped and the second cross-sectional profile is U-shaped. [7] Loudspeaker surround (100) according to any one of the preceding claims, characterized by , that a roll width (W) of the first cross-sectional profile and / or the second cross-sectional profile is essentially constant in the circumferential direction, while a roll height (H) of the first cross-sectional profile and / or the second cross-sectional profile varies in the circumferential direction. [8] Loudspeaker surround (100) according to claim 7, characterized by, that the roll height (H) of the first cross-sectional profile and / or the second cross-sectional profile is greater than half the roll width (W) of the first cross-sectional profile and / or the second cross-sectional profile. [9] Loudspeaker surround (100) according to any one of the preceding claims, characterized by , that a thickness (T) of the first cross-sectional profile and / or the second cross-sectional profile varies in the circumferential direction and / or along the developed arc length (L). [10] Loudspeaker surround (100) according to any one of the preceding claims, characterized by , that the rolling section (130) is directed section by section inwards and section by section outwards along the circumferential direction. [11] Loudspeaker and / or a passive diaphragm device comprising a loudspeaker surround (100) according to any of the preceding claims and a diaphragm, preferably a passive diaphragm.

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