Loudspeaker assembly and electric vehicle

Abstract

A speaker assembly and an electric vehicle are provided. The speaker assembly includes: a speaker unit having an axis and having a diaphragm assembly; a horn structure having a base portion and a peripheral portion, where the base portion of the horn structure is disposed on a first axial side of the speaker unit, facing or opposite the diaphragm assembly of the speaker unit, and the peripheral portion of the horn structure is disposed on a second axial side of the speaker unit. And the peripheral portion of the horn structure extending from the base portion of the horn structure is positioned radially outward of the speaker unit and extends toward a second axial side of the speaker unit opposite the first axial side. The electric vehicle includes a speaker assembly.

Description

Technical Field

[0001] This disclosure generally relates to a speaker assembly and an electric vehicle including the speaker assembly. Background Technology

[0002] As electric vehicles gain popularity, new challenges have emerged due to their quiet operation. Traditional internal combustion engine vehicles naturally produce sound due to their engine operation. Over time, the sound of a vehicle's engine has become a signal or indicator for nearby individuals to detect an approaching or operating vehicle. The quiet nature of electric vehicles can pose potential safety risks, especially at low speeds when tire noise is minimal. To address this challenge, there is a growing need for using speaker assemblies to artificially generate the engine sound and / or horn sound of electric vehicles to warn nearby individuals.

[0003] While the concept of using speaker assemblies to generate artificial sounds of engines and / or horns seems simple, achieving the desired sound pressure level presents considerable challenges, especially when using compact speakers designed for vehicle mounting. Traditional speaker designs often fail to produce the required loudness or sound pressure level, particularly in the target frequency range of 1kHz to 3kHz, which is the most critical frequency range for engine and / or horn sounds.

[0004] Additionally, speaker assemblies used in such outdoor installations or directly exposed to environmental factors are at risk of damage from elements such as water and small stones. It is important to incorporate protective features that safeguard the speaker assembly's diaphragm from these threats without compromising sound quality.

[0005] Therefore, there is a need in the art for a speaker assembly that can mitigate or solve at least some of the above-mentioned problems. Summary of the Invention

[0006] According to one aspect of this disclosure, a loudspeaker assembly is provided. The loudspeaker assembly includes: a loudspeaker unit having an axis and a diaphragm assembly; a horn structure having a base portion and a peripheral portion, wherein the base portion of the horn structure is disposed on a first axial side of the loudspeaker unit, facing or opposite to the diaphragm assembly of the loudspeaker unit, and the peripheral portion of the horn structure extending from the base portion of the horn structure is positioned radially outside the loudspeaker unit and extends toward a second axial side of the loudspeaker unit opposite to the first axial side.

[0007] According to another aspect of this disclosure, an electric vehicle is provided. The electric vehicle includes the speaker assembly described above. Attached Figure Description

[0008] This disclosure will be better understood with reference to the following figures and description. The components shown in the figures are not necessarily drawn to scale, but rather the principles illustrated in this disclosure are intended to be emphasized. Furthermore, in the figures, the same reference numerals denote the same parts throughout the figures.

[0009] Figures 1A to 1C A schematic structural diagram of a loudspeaker assembly according to one or more embodiments of the present disclosure is shown, wherein... Figure 1A An assembly diagram of the speaker components is shown. Figure 1B An enlarged view of the speaker unit of the speaker assembly is shown, and Figure 1C An exploded view of the speaker assembly is shown;

[0010] Figure 2A A perspective view of a speaker assembly is shown, with one half of the speaker assembly cut off to reveal its internal structure;

[0011] Figure 2B An exploded view of the speaker assembly is shown;

[0012] Figure 3 The speaker assembly is shown with Figure 1A A similar view, but including certain dimensions of the speaker components;

[0013] Figure 4 A graph comparing the sound pressure level (SPL) of a loudspeaker assembly according to an embodiment of the present disclosure and a comparative example is shown;

[0014] Figure 5 A vehicle according to one or more embodiments of this disclosure is shown. Detailed Implementation

[0015] Various embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings.

[0016] As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context explicitly indicates otherwise. As used herein, the terms “comprise,” “comprising,” “include,” and / or “including” specify the presence of the stated feature, integer, step, operation, element, and / or component, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. As used herein, the terms “and / or” and the symbol “ / ” signify any and all combinations including one or more of the associated listed items. Furthermore, while the terms “first,” “second,” etc., may be used herein to describe various elements, components, steps, or calculations, these elements, components, steps, or calculations should not be limited by these terms, but rather these terms are used only to distinguish one element, component, step, or calculation from another. For example, a first component may be referred to as a second component; similarly, a first calculation may be referred to as a second calculation; likewise, a first step may be referred to as a second step; all of these do not depart from the scope of this disclosure.

[0017] For the purpose of clarifying its use in pending claims and to provide notice to the public, unless expressly stated to the contrary by the applicant, the phrase "in lieu of any other implied definition above or below" shall apply. 、 ,……and <n> "at least one of" or "< / n> 、 、……、 <n>"or at least one of their combinations" is defined by the applicant in the broadest sense as one or more elements selected from the group consisting of A, B, ... and N, that is, any combination of one or more elements A, B, ... or N that includes any single element or a combination of one or more elements with other elements (which may also include additional elements not listed).

[0018] As used herein, the term "axis" refers to the central axis passing through the loudspeaker unit or loudspeaker assembly, and the term "axial direction" refers to the direction along the axis. The term "radial direction" refers to the direction perpendicular to the axis, toward or away from the axis. The terms "radially inward," "radially towards," "inner," or "inner portion" refer to a direction, location, or portion relatively closer to the axis, and the terms "radially outward," "radially outward," "outer," or "outer portion" refer to a direction, location, or portion relatively away from the axis.

[0019] This disclosure provides a loudspeaker assembly including a loudspeaker unit having a diaphragm assembly and a horn structure having a base portion and a peripheral portion. The base portion of the horn structure is disposed on a first axial side of the loudspeaker unit, opposite to the diaphragm assembly of the loudspeaker unit, and the peripheral portion of the horn structure extending from the base portion of the horn structure is positioned radially outward of the loudspeaker unit and extends toward a second axial side of the loudspeaker unit.

[0020] The horn structure (including the base portion and the peripheral portion) is spaced apart from the speaker unit, thereby defining a space or cavity between them. This space or cavity can serve as a resonant cavity for sound resonance from the speaker unit, and as a relatively narrow path or channel for sound propagation. Due to resonance within the resonant cavity as it propagates, sound (especially within a specific frequency range) is amplified, resulting in an increased sound pressure level.

[0021] In one or more embodiments, the loudspeaker assembly includes a back cavity structure that is connected to the frame on the side of the frame opposite to the diaphragm assembly and, together with the frame, defines the back cavity.

[0022] This arrangement provides a defined space or volume behind the diaphragm assembly, thereby allowing controlled air movement and achieving the desired acoustic performance.

[0023] In one or more embodiments, the peripheral portion of the speaker structure and the back cavity structure define a channel that has a gradually expanding dimension in the sound propagation direction from the first axial side of the speaker unit toward the second axial side.

[0024] This structure, used as a traditional loudspeaker, further amplifies sound waves through reflection and resonance. It also allows for a wider distribution of sound waves.

[0025] < / n> Figures 1A to 1C A schematic structural diagram of a loudspeaker assembly 100 according to one or more embodiments of the present disclosure is shown, wherein Figure 1A An assembly diagram of the speaker assembly 100 is shown. Figure 1B An enlarged view of the speaker unit 110 of the speaker assembly 100 is shown, and Figure 1C An exploded view of the speaker assembly 100 is shown.

[0026] The loudspeaker assembly 100 includes a loudspeaker unit 110, a horn structure 160, and a back cavity structure 180.

[0027] The loudspeaker unit 110 has an axis x and includes a magnetic assembly 120, a frame 130, and a diaphragm assembly 140. The magnetic assembly 120 includes a magnet 122, a yoke 124, and a top plate 126. The magnetic assembly 120 defines a magnetic gap, and the yoke 124 and the top plate 126 are arranged and configured to guide and / or concentrate magnetic flux from the magnet 122 through the magnetic gap. The frame 130 includes a frame base 134, a top portion 136, and an extension 132 that extends between the frame base 134 and the top portion and connects the frame base and the top portion. The frame 130 is fixedly connected to the magnetic assembly 120. In the illustrated embodiment, the frame 130 is fixedly connected to the magnetic assembly 120 via a connection between the frame base 134 and the top plate 126 of the magnetic assembly 120. In one or more embodiments, the frame 130 is insert-molded with the magnetic assembly 120. The diaphragm assembly 140 includes a diaphragm 142, a dust cap 144, and a surround 146. The diaphragm 142 is connected to the frame 130 via the surround 146, and the dust cap 144 is connected to the diaphragm 142. The loudspeaker unit 110 also includes a voice coil 150 and / or a spider 152, which is connected between the voice coil 150 and the frame 130. The voice coil 150 is connected to the diaphragm 142 at its upper end and has a coil portion suspended in a magnetic gap. During operation, the voice coil 150 receives an electrical audio signal from an external source and vibrates in the magnetic gap in response to the audio signal passing through the voice coil 150 in the magnetic gap, causing both the diaphragm 142 and the dust cap 144 connected to the voice coil 150 to vibrate and emit sound. The loudspeaker unit 110 shown is merely illustrative, and this disclosure can include loudspeaker units with any suitable structure.

[0028] The speaker structure 160 includes a base portion and a peripheral portion 168. The base portion is disposed on the axial side (i.e., the first axial side) of the speaker unit 110 and includes three sections: a first base section 164, a second base section 162, and a third base section 166. As shown, the first base section 164 is arranged facing or opposite to the diaphragm 142 of the diaphragm assembly 140, and is spaced apart from and parallel to the diaphragm 142. The second base section 162 is arranged facing or opposite to the dust cap 144, and is spaced apart from the dust cap. The third base section 166 is arranged facing or opposite to the top of the back cavity structure 180, and is spaced apart from and parallel to the top of the back cavity structure 180. The peripheral portion 168 of the speaker structure 160 extends from the base portion of the speaker structure 160, specifically from the outer edge of the third base section 166, and is positioned radially outside the speaker unit 110 and extends toward the second axial side of the speaker unit opposite to the first axial side.

[0029] As shown, the base portion of the speaker structure 160 is spaced apart from the speaker unit 110, thereby defining a space or cavity 170 between the base portion of the speaker structure 160 and the speaker unit 110. The space or cavity 170 may also be referred to as a resonant cavity. The space or cavity 170 acts as a relatively narrow path or channel for the propagation of sound from the speaker unit 110. It also serves as a space for sound resonance, resulting in amplified sound. Specifically, during operation, the voice coil 150 vibrates in response to an audio signal passing through it, causing the diaphragm 142 and the dust cap 144 to vibrate to emit sound waves. The sound waves initially enter the resonant cavity 170 and then undergo reflection and resonance within it. Due to the resonance within the resonant cavity 170, the sound (especially within a specific frequency range) is amplified, resulting in an increased sound pressure level.

[0030] The sound then leaves the resonant cavity 170 and enters the horn region or horn space 176 defined between the back cavity structure 180 and the peripheral portion 168. The horn region or horn space 176 has a gradually expanding dimension in the direction of sound propagation. This structure serves as a conventional horn for further amplifying sound waves through reflection and resonance. This structure also helps to disperse sound over a wider area through its gradually expanding dimension in the direction of sound propagation, thus allowing for a broader distribution of sound waves. This structure also improves the audio performance of the loudspeaker assembly.

[0031] By means of a horn structure, sound waves from speaker unit 110 resonate within the resonant cavity 170 and / or horn region or horn space 176 as they propagate through it. This resonance effect amplifies the sound waves, thereby enhancing the overall sound output level, particularly in the target frequency range. Therefore, the speaker assembly 100 of this disclosure is capable of providing an enhanced sound output level with a relatively small speaker unit. This is particularly advantageous when the speaker assembly 100 is provided in an electric vehicle for emitting engine sounds and / or horn sounds.

[0032] A cavity structure 180 is attached to the frame 130 on the side of the frame 130 opposite to the diaphragm assembly 140, and together with the frame 130 defines a cavity 190. This means that the cavity structure 180 and the cavity 190 are located behind the diaphragm 142 or the diaphragm assembly. As shown, the cavity structure 180 includes a top segment 184, a bottom segment 186, and a sloped segment 182 that extends between and connects the top and bottom segments. The frame 130, the top segment 184, the bottom segment 186, and the sloped segment 182 together define the cavity 190.

[0033] Figure 2A A perspective view of a speaker assembly 100 is shown, in which half of the speaker assembly 100 is cut off to show the internal structure of the speaker assembly 100. Figure 2B An exploded view of the loudspeaker assembly 100 is shown. As clearly shown, the outward extension 132 of the frame 130 is in the form of spaced-apart ribs 132 separated by gaps 132a between the ribs. This design allows the back cavity 190, defined by the frame 130 and the back cavity structure 180, to communicate with the air behind the diaphragm 142 of the loudspeaker unit 110 through the gaps 132a. This arrangement provides a space or volume defined behind the diaphragm 142 or diaphragm assembly 140, thereby allowing controlled air movement and achieving desired acoustic performance.

[0034] Additionally, the speaker structure 160 (resonant cavity) cooperates with the back cavity structure 180 (back cavity) located behind the diaphragm 142 of the speaker unit 110. The resonant cavity is focused on amplifying sound within the target frequency range, while the volume of the back cavity 190 can be adjusted to fine-tune the speaker unit's free resonant frequency (fs). This combination provides a combined effect, thereby ensuring optimal sound output for both in or near the specified frequency range.

[0035] Another advantage of the speaker assembly 100 disclosed herein is its protection against environmental threats. Specifically, the horn structure 160 and / or the back cavity structure 180 act as a barrier to protect the diaphragm assembly 140 and / or the voice coil 150 from external elements such as water and small stones, thereby ensuring the speaker's lifespan and consistent sound performance. This is particularly advantageous when the speaker assembly 100 is provided in an electric vehicle for emitting engine sound and / or horn sound.

[0036] Figure 3 The speaker assembly 100 is shown with Figure 1A Similar views, but including certain dimensions of the speaker assembly 100. The inventors of this disclosure have discovered that specific dimensions or ranges of dimensions are crucial for optimizing the acoustic performance of the speaker assembly 100. In one or more embodiments of this disclosure, the first base segment 164 is spaced from the diaphragm 142 by a distance d1 of 1-20 mm, the third base segment 166 is spaced from the top of the back cavity structure 180 (top segment 184) by a distance d2 of 1-20 mm, the radial outer edge of the back cavity structure 180 is spaced from the peripheral portion 168 by a distance d3 of 1-50 mm, and the inclined segment 182 forms an angle α of 0-90 degrees with the peripheral portion 168, and the back cavity 190 has a volume of 0.1-20 L.

[0037] In one or more other embodiments of this disclosure, the distance d1 can be in the range of 3-9 mm, the distance d2 can be in the range of 5-11 mm, the distance d3 can be in the range of 5-10 mm, and the angle α can be in the range of 15-50 degrees, and the back cavity 190 can have a volume of 0.15-0.6 liters. In some other embodiments of this disclosure, the distance d1 can be about 6 mm, such as 5-7 mm, the distance d2 can be about 8 mm, such as 7-9 mm, the distance d3 can be about 7.5 mm, such as 6.5-8.5 mm, the angle α can be about 28 degrees, such as 23-33 degrees, and the back cavity 190 can have a volume of about 0.32 liters, such as 0.22-0.42 liters.

[0038] The carefully chosen dimensions described above not only affect the accuracy and clarity of the produced sound, but also influence the energy efficiency and sound distribution of the speaker assembly 100. These dimensions are crucial because they enhance resonance, reduce distortion, and allow for a wider distribution of sound waves.

[0039] Figures 1A to 3 A specific construction of the horn structure 160 of the loudspeaker assembly 100 is shown. For example, in some embodiments, the horn structure 160 is formed of a solid plate or solid plate structure without holes or through holes. This disclosure is not limited thereto, and the horn structure of this disclosure can have any suitable construction, as long as it has a base portion arranged facing or opposite to the diaphragm assembly of the loudspeaker unit and a peripheral portion extending from the base portion of the horn structure and positioned radially outside the loudspeaker unit, such that sound waves from the diaphragm assembly of the loudspeaker unit can undergo reflection and resonance, resulting in an increased sound pressure level. For example, the horn structure may not be a separate structure, but may be part of other structures, such as walls of other structures, as long as the walls provide the base portion and the peripheral portion.

[0040] exist Figures 1A to 3 In the illustrated embodiment, the speaker assembly has a back cavity structure with a specific configuration. This disclosure is not limited thereto, and in one or more other embodiments, the speaker assembly may not include a back cavity structure. In some other embodiments, the speaker assembly may include a back cavity structure with any suitable configuration, provided that the back cavity structure, in conjunction with the frame, defines a back cavity with a suitable volume.

[0041] Figure 4 A graph comparing the sound pressure level (SPL) of a speaker assembly according to an embodiment of the present disclosure and a comparative example is shown. The dashed line represents the SPL of the speaker assembly according to an embodiment of the present disclosure, where the distance d1 is approximately 6 mm, the distance d2 is approximately 8 mm, the distance d3 is approximately 7.5 mm, the angle α is approximately 28 degrees, and the back cavity 190 has a volume of approximately 0.32 liters. In contrast, the solid line represents the SPL of a comparative example, which has a similar structure to the embodiment of the present disclosure but lacks the horn structure 160 and the back cavity structure 180. As shown, the SPL curve of the speaker assembly according to an embodiment of the present disclosure demonstrates a significant improvement in SPL compared to the SPL curve of the speaker assembly according to the comparative example. Notably, the SPL curve of the speaker assembly according to an embodiment of the present disclosure provides an SPL improvement of more than 10 dB in the frequency range of 1-3 kHz, which is most desirable when the speaker assembly 100 is used in an electric vehicle to emit engine sounds and / or horn sounds.

[0042] Figure 5 A vehicle 10 according to one or more embodiments of the present disclosure is shown. The vehicle 10 includes a speaker assembly 100 according to one or more embodiments of the present disclosure. In some embodiments, the vehicle 10 may be an electric vehicle, and the speaker assembly 100 is provided for emitting engine sounds and / or horn sounds.

[0043] According to one or more embodiments of this disclosure, this disclosure can be implemented as follows.

[0044] Item 1: A loudspeaker assembly comprising: a loudspeaker unit having an axis and a diaphragm assembly; a horn structure having a base portion and a peripheral portion, wherein the base portion of the horn structure is disposed on a first axial side of the loudspeaker unit, facing or opposite to the diaphragm assembly of the loudspeaker unit, and the peripheral portion of the horn structure extending from the base portion of the horn structure is positioned radially outside the loudspeaker unit and extends toward a second axial side of the loudspeaker unit opposite to the first axial side.

[0045] Project 2: A loudspeaker assembly according to Project 1, wherein the loudspeaker unit comprises: a magnetic assembly defining a magnetic gap; a frame attached to the magnetic assembly, the diaphragm assembly being connected to the frame; and a voice coil connected to the diaphragm assembly, the voice coil having a coil portion at least partially suspended within the magnetic gap.

[0046] Item 3: A loudspeaker assembly according to any one of Items 1 to 2, wherein the loudspeaker assembly further comprises a back cavity structure connected to the frame on a side of the frame opposite to the diaphragm assembly and defining a back cavity in conjunction with the frame.

[0047] Item 4: A loudspeaker assembly according to any one of Items 1 to 3, wherein the diaphragm assembly includes a diaphragm and a surround, and the base portion of the loudspeaker structure includes a first base section opposite to and parallel to the diaphragm extension of the diaphragm assembly.

[0048] Item 5: A loudspeaker assembly according to any one of Items 1 to 4, wherein the diaphragm assembly includes a dust cap attached to the diaphragm, and the loudspeaker structure includes a second segment opposite to the dust cap.

[0049] Item 6: A loudspeaker assembly according to any one of Items 1 to 5, wherein the back cavity structure includes a top section, a bottom section, and a sloping section, the sloping section bridging the top section and the bottom section, the frame, the top section, the bottom section, and the sloping section together defining the back cavity.

[0050] Item 7: A loudspeaker assembly according to any one of Items 1 to 6, wherein the base portion of the loudspeaker structure includes a third base section that is opposite to and extends parallel to the top section of the back cavity structure.

[0051] Item 8: A loudspeaker assembly according to any one of Items 1 to 7, wherein the peripheral portion of the speaker structure and the inclined section of the back cavity structure define a channel having a gradually expanding dimension in the sound propagation direction from the first axial side of the loudspeaker unit toward the second axial side.

[0052] Item 9: A speaker assembly according to any one of Items 1 to 8, wherein the first base section is spaced 3-9 mm from the diaphragm of the diaphragm assembly, preferably 5-7 mm.

[0053] Item 10: A speaker assembly according to any one of items 1 to 9, wherein the third base section is spaced 5-11 mm apart from the top section of the back cavity structure, preferably 7-9 mm apart.

[0054] Item 11: A loudspeaker assembly according to any one of items 1 to 10, wherein the inclined section of the back cavity structure is at an angle of 15-50 degrees, preferably at an angle of 23-33 degrees.

[0055] Item 12: A loudspeaker assembly according to any one of items 1 to 11, wherein the back cavity has a volume of 0.15-0.6 liters, preferably 0.22-0.42 liters.

[0056] Item 13: An electric vehicle comprising a speaker assembly according to any one of items 1 to 12.

[0057] Item 14: The electric vehicle according to Item 13, wherein the speaker assembly is configured to emit engine sounds and / or horn sounds.

[0058] Systems and methods have been described in general terms to aid in understanding the details of this disclosure. In some cases, well-known structures, materials, and / or operations have not been specifically shown or described in detail to prevent obscuring aspects of this disclosure. In other cases, specific details have been given to provide a thorough understanding of this disclosure. Those skilled in the art will recognize that this disclosure may be embodied in other specific forms, such as to suit a particular system or device or situation, or material or component, without departing from its spirit or essential characteristics. Therefore, the disclosure and description herein are intended to define the scope of this disclosure and not to limit it. Consequently, this disclosure is not limited except by consideration of the appended claims and their equivalents.

Claims

1. A loudspeaker assembly, comprising: A loudspeaker unit having an axis and a diaphragm assembly; A speaker structure having a base portion and a peripheral portion, wherein the base portion of the speaker structure is disposed on a first axial side of the speaker unit, facing or opposite to the diaphragm assembly of the speaker unit, and the peripheral portion of the speaker structure extending from the base portion of the speaker structure is positioned radially outside the speaker unit and extends toward a second axial side of the speaker unit opposite to the first axial side.

2. The loudspeaker assembly of claim 1, wherein the loudspeaker unit comprises: Magnetic components that define the magnetic gap; A frame attached to the magnetic component, the diaphragm assembly being connected to the frame; And a voice coil connected to the diaphragm assembly, the voice coil having a coil portion at least partially suspended within the magnetic gap.

3. The loudspeaker assembly of claim 2, wherein the loudspeaker assembly further comprises a back cavity structure connected to the frame on a side of the frame opposite to the diaphragm assembly and defining a back cavity together with the frame.

4. The loudspeaker assembly according to any one of claims 1 to 3, wherein The diaphragm assembly includes a diaphragm and a surround, and the base portion of the horn structure includes a first base section that is opposite to and extends parallel to the diaphragm of the diaphragm assembly.

5. The loudspeaker assembly of claim 4, wherein the diaphragm assembly includes a dust cap attached to the diaphragm, and the loudspeaker structure includes a second section opposite to the dust cap.

6. The speaker assembly of claim 3, wherein the back cavity structure includes a top section, a bottom section, and a sloping section, the sloping section bridging the top section and the bottom section, the frame, the top section, the bottom section, and the sloping section together defining the back cavity.

7. The loudspeaker assembly of claim 6, wherein the base portion of the loudspeaker structure includes a third base section that is opposite to and extends parallel to the top section of the back cavity structure.

8. The loudspeaker assembly of claim 6, wherein the peripheral portion of the horn structure and the inclined section of the back cavity structure define a channel having a gradually expanding dimension in the sound propagation direction from the first axial side of the loudspeaker unit toward the second axial side.

9. The loudspeaker assembly according to claim 4, wherein the first base section is spaced 3-9 mm from the diaphragm of the diaphragm assembly, preferably 5-7 mm.

10. The speaker assembly of claim 7, wherein the third base section is spaced 5-11 mm from the top section of the back cavity structure, preferably 7-9 mm.

11. The loudspeaker assembly of claim 8, wherein the inclined section of the back cavity structure is at an angle of 15-50 degrees, preferably at an angle of 23-33 degrees.

12. The loudspeaker assembly of claim 6, wherein the back cavity has a volume of 0.15-0.6 liters, preferably 0.22-0.42 liters.

13. An electric vehicle comprising a speaker assembly according to any one of claims 1 to 12.

14. The electric vehicle of claim 13, wherein the speaker assembly is configured to emit engine sounds and / or horn sounds.

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