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Title:
LOUDSPEAKER UNIT, LOUDSPEAKER COVER, AND METHODS
Document Type and Number:
WIPO Patent Application WO/2019/231375
Kind Code:
A1
Abstract:
A loudspeaker unit (14) comprises a housing (24); a loudspeaker arranged inside the housing (24); and a loudspeaker cover (28) supported by the housing (24), wherein the loudspeaker cover (28) is configured as a textile sleeve extending along a sleeve axis (A) and comprising a first axial end opening (38), the sleeve enclosing and covering at least a portion of the housing (24), wherein the loudspeaker cover (28) is elastically held to the housing (24) in a radial direction, with respect to said sleeve axis (A), by intrinsic elasticity of the textile, and configured to be slid off the housing (24) for replacement.

Inventors:
GRANATH ANNA (SE)
Application Number:
PCT/SE2019/050421
Publication Date:
December 05, 2019
Filing Date:
May 13, 2019
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
IKEA SUPPLY AG (CH)
GRANATH ANNA (SE)
International Classes:
H04R1/02; F21V33/00; B32B5/26
Domestic Patent References:
WO2018175183A12018-09-27
Foreign References:
FR2408269A11979-06-01
CA1121276A1982-04-06
CA1203218A1986-04-15
EP3165648A12017-05-10
US9848255B12017-12-19
Attorney, Agent or Firm:
STRÖM & GULLIKSSON AB (SE)
Download PDF:
Claims:
Claims

1. A loudspeaker unit (14; 114) comprising

a housing (24);

a loudspeaker (34, 36) arranged inside the housing (24; 124); and a loudspeaker cover (28; 128) supported by the housing (24; 124), wherein the loudspeaker cover (28; 128) is configured as a textile sleeve extending along a sleeve axis (A) and comprising a first axial end opening (38), the sleeve enclosing and covering at least a portion of the housing (24; 124), wherein

the loudspeaker cover (28; 128) is elastically held to the housing (24; 124) in a radial direction, with respect to said sleeve axis (A), by intrinsic elasticity of the textile, and configured to be slid off the housing (24; 124) for replacement or washing.

2. The loudspeaker unit of claim 1 , wherein the loudspeaker cover (28; 128) is at least partly knitted, and optionally knitted to a tubular cross-section as seen along the sleeve axis (A); preferably, at least partly weft knitted, and even more preferably, at least partly stockinette and/or double pique.

3. The loudspeaker unit of claim 2, wherein the loudspeaker cover (28; 128) is flatbed knitted.

4. The loudspeaker unit according to any of the claims 2-3, wherein at least a portion of the knitted loudspeaker cover (28; 128) has a right side and a wrong side (48), wherein the right side faces the housing (24; 124).

5. The loudspeaker unit according to any of the previous claims, wherein said loudspeaker cover (28) further comprises a second axial end opening (40), said first and second axial end openings (38, 40) being positioned at opposite axial ends of said loudspeaker cover (28).

6. The loudspeaker unit according to any of the previous claims, wherein an axial end (50; 52) of the loudspeaker cover (28; 128), defining an axial end opening (38; 40), has a loose edge permitting lifting off the housing (24; 124).

7. The loudspeaker unit according to any of the claims 2-6, wherein an elastic portion (44) of the loudspeaker cover (28) is formed by ribbing or Garter stitch; preferably the ribbing or Garter stitch is arranged adjacent to said first axial end opening (38).

8. The loudspeaker unit according to any of the previous claims, wherein the

loudspeaker cover (28) comprises an axial mid section (42) and, at each axial opening (38; 40), an axial end section (44; 46), wherein stitches and/or yarn materials of the mid section (42) are different from those of at least one of the axial end sections (44; 46).

9. The loudspeaker unit according to any of the previous claims, wherein at least a portion of the loudspeaker cover (28; 128) is knitted using an elastic yarn (54), which preferably comprises at least 20% by weight of an elastic fiber, preferably said elastic fiber comprising elastomer, such as elastane.

10. The loudspeaker unit according to any of the previous claims, wherein at least a portion of the loudspeaker cover (28; 128) is knitted using a yarn (54) comprising at least 20% by weight of polyester.

11. The loudspeaker unit according to any of the previous claims, wherein a yarn (54) of the loudspeaker cover (28; 128) has a linear density of between 120 dtex and 220 dtex.

12. The loudspeaker unit according to any of the previous claims, wherein at least a portion of the loudspeaker cover (28; 128) is knitted with a knitting gauge of between 5 and 18 stitches per inch, more preferably a gauge of 8 to 16.

13. The loudspeaker unit according to any of the previous claims, wherein a wall of the housing (24; 124) is configured as a perforated plastic body, wherein perforations (26) of the housing (24; 124) are in register with said loudspeaker (34; 36).

14. The loudspeaker unit according to any of the previous claims, further

comprising an audio amplifier.

15. A lamp (10) comprising a light source holder (14), such as a stand, provided with a light source socket (20), the light source holder (14) being configured as a loudspeaker unit according to any of the previous claims.

16. A replaceable flexible loudspeaker cover (28; 128) for a loudspeaker unit (14;

114) according to any of the previous claims, wherein the loudspeaker cover (28; 128) is configured as a textile sleeve extending along a sleeve axis (A) and comprising a first axial end opening (38), the sleeve being configured to enclose and cover at least a portion of a loudspeaker housing (24; 124), wherein the loudspeaker cover (28; 128) is elastic in a radial direction, with respect to said sleeve axis (A), by intrinsic elasticity of the textile, such that it may be held to the housing (24; 124) by elastically squeezing the housing (24; 124), and may be slid off the housing (24; 124) for replacement.

17. A method of assembling a loudspeaker unit, comprising

providing a housing (24; 124) comprising a loudspeaker (34, 38);

providing a loudspeaker cover (28; 128) configured as a textile sleeve extending along a sleeve axis (A) and comprising an axial end opening (38); inserting the housing (24; 124) into the loudspeaker cover (28; 128) via said axial end opening (38); and

allowing the loudspeaker cover (28; 128) to elastically engage with the housing (24; 124).

18. A method of renovating a loudspeaker unit, comprising

sliding off a first loudspeaker cover (28; 128) from a housing (24; 124) comprising a loudspeaker (34, 36);

providing a second loudspeaker cover (28; 128), configured as a textile sleeve extending along a sleeve axis (A) and comprising an axial end opening (38);

inserting the housing (24; 124) into the second loudspeaker cover (28; 128) via said axial end opening (38); and

allowing the sleeve (28; 128) to elastically engage with the housing (24;

124).

Description:
LOUDSPEAKER UNIT LOUDSPEAKER COVER. AND METHODS

Field of the invention

The present invention relates to a loudspeaker unit, a loudspeaker cover, and methods of assembling and renovating a loudspeaker unit.

Background of the invention

As earth’s population increases, more and more people move into cities, and tend to live closer together, as the cost of accommodation rises. At the same time, there is an incessant strive to reduce the environmental impact of modern lifestyle.

Summary of the invention

It is an object of the present invention to solve, or at least mitigate, parts or all of the above mentioned problems. To this end, there is provided a loudspeaker unit comprising a housing; a loudspeaker arranged inside the housing; and a loudspeaker cover supported by the housing, wherein the loudspeaker cover is configured as a textile sleeve extending along a sleeve axis and comprising a first axial end opening, the sleeve enclosing and covering at least a portion of the housing, wherein the loudspeaker cover is elastically held to the housing in a radial direction, with respect to said sleeve axis, by intrinsic elasticity of the textile, and configured to be slid off the housing for replacement or washing. Such an arrangement facilitates replacing e.g. a broken loudspeaker cover, which extends product life and reduces environmental impact. In particular, the arrangement may allow completely tool-less replacement. Moreover, it permits changing to a loudspeaker cover of a different colour and/or pattern, which allows following trends without replacing the entire product, which also extends product life and reduces environmental impact. In addition, if the

loudspeaker cover becomes stained, e.g. by accidental contact with food or beverages, it can be taken off and washed, e.g. in a washing machine, and then put back again. Thanks to the loudspeaker cover squeezing the housing by means of its intrinsic elasticity, the need for any auxiliary bracing arrangements for stretching and bracing the textile to the housing is reduced. According to an embodiment, the loudspeaker cover is unbraced, i.e. , it is held to the housing only by squeezing the housing. The housing and the unbraced loudspeaker cover may be shaped to allow removal of the unbraced loudspeaker cover without first removing any other elements, such as housing parts. According to an embodiment, the loudspeaker cover may be at least partly knitted, and optionally knitted to a tubular cross-section as seen along the sleeve axis; preferably, at least partly weft knitted, and even more preferably, at least partly Stockinette. It has unexpectedly been found that, while a knitted fabric may provide the desired elasticity to elastically engage with an object, it may also provide a good sound transparency within the audible frequency range for loudspeaker cover applications. Weft knitted fabrics, in which a single yarn forms multiple loops across the entire width of the fabric, may be particularly elastic. In such a knitting, each course of yarn may form such multiple loops along a tangential direction

perpendicular to the sleeve axis. Stockinette, such as single Jersey, has been found to be particularly suitable. The knit may, for example, be knitted in a flatbed knitting machine or a circular bed knitting machine.

According to an embodiment, the loudspeaker cover is flatbed knitted. Flatbed knitting generally facilitates obtaining a coarser fabric, which may typically be particularly well suited for obtaining a high level of sound transparency.

According to an embodiment, at least a portion of the knitted loudspeaker cover has a right side and a wrong side, wherein the right side faces the housing.

The wrong, or reverse, side of e.g. a stockinette stitch generally has a flatter surface, whereas the right side has a relatively more structured surface. By arranging the loudspeaker cover wrong side out, the structure of the right side will hold the loudspeaker cover at a distance from the housing, which reduces the visibility of the housing through the loudspeaker cover.

According to an embodiment, said loudspeaker cover may further comprise a second axial end opening, said first and second axial end openings being positioned at opposite axial ends of said loudspeaker cover.

According to an embodiment, an axial end of the loudspeaker cover, defining an axial end opening, may have a loose edge permitting lifting off the housing.

Thereby, the edge may easily be grasped for sliding the loudspeaker cover off the housing for replacement. Here,“loose” should be construed as the edge not being fixedly attached to the housing. Optionally, a second axial end of the loudspeaker cover, defining said second axial end opening, also has a loose edge.

According to an embodiment, an elastic portion of the loudspeaker cover is formed by ribbing or Garter stitch; preferably, the ribbing or Garter stitch is arranged adjacent to said first axial end opening. Optionally, a ribbing or Garter stitch may be arranged adjacent each of two opposing axial end openings. By“ribbing” is meant a knitted pattern in which stripes of Stockinette stitch alternate with stripes of reverse Stockinette stitch. The stripes may preferably extend in a direction along the sleeve axis, and may, for example, be parallel to the sleeve axis.

According to an embodiment, the loudspeaker cover may comprise an axial mid section and, at each axial opening, an axial end section, wherein stitches and/or yarn materials of the mid section are different from those of at least one of the axial end sections. By way of example, one of, or both, axial end sections may have a relatively higher elasticity, while the mid section may have a relatively lower elasticity. For example, the axial mid section may be configured as a double pique knit, and an axial end section may be configured as Stockinette ribbing. The housing enclosing the loudspeaker may have a larger width at its central portion than adjacent at least one of its axial end portions, as seen along the sleeve axis; hence, it may be preferable that the sleeve has a larger radial width at its mid section than at said first axial end section.

According to an embodiment, at least a portion of the loudspeaker cover is knitted using an elastic yarn. The elastic yarn may obtain its elasticity at least partly based on the structure of the yarn. Alternatively or additionally, the yarn may comprise at least 20% by weight of an elastic type fibre, preferably comprising elastomer, such as elastane (spandex) fibre. Optionally, the yarn may comprise at least 40% by weight, at least 60% by weight, or at least 80% by weight of elastic type fibre, preferably elastomer. The knit may comprise courses of high-elastic type fibre, preferably elastane, yarn (more than 40% by weight of elastic type fibre, preferably elastomer) alternating with courses of low-elastic type fibre, preferably elastomer, yarn (less than 20% by weight of elastic type fibre, preferably elastomer).

According to an embodiment, at least a portion of the loudspeaker cover is knitted using a yarn comprising at least 20% by weight polyester. Optionally, the yarn may comprise at least 40% by weight, at least 60% by weight, or at least 80% by weight polyester.

According to an embodiment, a yarn of the loudspeaker cover has a linear density of between 120 dtex and 220 dtex. A typical linear density may, by way of example, be about 167 dtex. Additionally or alternatively, a yarn of the loudspeaker cover may have between 24 and 48 filaments, such as 36. The filaments may be of single-fibre type. According to an embodiment, at least a portion of the loudspeaker cover may be knitted with a knitting gauge of between 5 and 18 stitches per inch, more preferably a gauge of 8 to 16. A typical gauge may be about 12 stitches per inch.

According to an embodiment, the outside of the housing may be free from any protruding corners or edges engaging with the inside of the loudspeaker cover. A coarse fabric, presenting a high level of sound transparency, may otherwise reveal or expose such sharp corners or edges. Hence, a housing free from corners or edges may permit obtaining a better sound quality. By way of example, an outer face of the housing may have an oval or substantially circular cross-section. An outer face of the housing may be rotationally symmetric about the sleeve axis.

According to an embodiment, a wall of the housing may be configured as a perforated plastic body, wherein perforations of the housing are in register with said loudspeaker.

According to an embodiment, the loudspeaker may be arranged inside the housing such that it faces, i.e. is configured to primarily direct the sound emitted therefrom, in a direction transversal to the sleeve axis. More specifically, the loudspeaker may face in a direction perpendicular to the sleeve axis.

According to an embodiment, the loudspeaker unit may further comprise an audio amplifier. The audio amplifier may be arranged within the housing. It may e.g. be powered by a battery arranged within the housing, or by a mains cable. The audio amplifier may also be provided with a wireless communications interface configured to receive streaming audio from a remote source, such as a smartphone.

According to a second aspect, there is provided a lamp comprising a light source holder, such as a stand, provided with a light source socket, wherein the light source holder may be configured as a loudspeaker unit in accordance with any of the embodiments disclosed hereinabove. The lamp may be e.g. a table lamp, a ceiling lamp, or a floor lamp. The socket may, by way of example, be a standard Edison socket such as an E14 or E27 socket.

According to a third aspect, there is provided a replaceable flexible

loudspeaker cover for a loudspeaker unit according to any of the embodiments disclosed hereinabove, wherein the loudspeaker cover is configured as a textile sleeve extending along a sleeve axis and comprising a first axial end opening, the sleeve being configured to enclose and cover at least a portion of a loudspeaker housing, wherein the loudspeaker cover is elastic in a radial direction, with respect to said sleeve axis, by intrinsic elasticity of the textile, such that it may be held to the housing by elastically squeezing the housing, and slid off the housing for replacement or washing. The loudspeaker cover may be configured in accordance with any of the embodiments defined hereinabove with reference to the loudspeaker unit.

According to a fourth aspect, there is provided a method of assembling a loudspeaker unit, the method comprising providing a housing comprising a

loudspeaker; providing a loudspeaker cover configured as a textile sleeve extending along a sleeve axis and comprising an axial end opening; inserting the housing into the loudspeaker cover via said axial end opening; and allowing the loudspeaker cover to elastically engage with the housing. Such a method may be performed without using any tools, i.e. tool-less. The housing and loudspeaker cover may be configured in accordance with any of the embodiments defined hereinabove.

According to a fifth aspect, there is provided a method of renovating a loudspeaker unit, the method comprising sliding off a first loudspeaker cover from a housing comprising a loudspeaker; providing a second loudspeaker cover, configured as a textile sleeve extending along a sleeve axis and comprising an axial end opening; inserting the housing into the second loudspeaker cover via said axial end opening; and allowing the sleeve to elastically engage with the housing. Such a method may be performed without using any tools, i.e. tool-less. The housing and first and second loudspeaker covers may be configured in accordance with any of the embodiments defined hereinabove.

It is noted that embodiments of the invention may be embodied by all possible combinations of features recited in the claims, as well as in the summary and the detailed description. Further, it will be appreciated that the various embodiments described for the devices above are all combinable with the methods as defined above, and vice versa.

Brief description of the drawings

The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non- limiting detailed description of preferred embodiments of the present invention, with reference to the appended drawings, where the same reference numerals will be used for similar elements, wherein:

Fig. 1 is a view in perspective of a table lamp comprising a loudspeaker unit according to a first embodiment; Fig. 2 is an exploded view in perspective of the table lamp of Fig. 1 ;

Fig. 3 is a view in perspective of a housing and a loudspeaker cover of the loudspeaker unit of the table lamp of Fig. 1 ;

Fig. 4 is a view in perspective of a loudspeaker unit according to a second embodiment; and

Fig. 5 is a flow chart illustrating a method of renovating a loudspeaker unit.

All the figures are schematic, not necessarily to scale, and generally only show parts which are necessary in order to elucidate the embodiments, wherein other parts may be omitted.

Detailed description of the exemplary embodiments

Fig. 1 illustrates a table lamp 10 powered via a mains cable 12. The table lamp 10 comprises a stand 14 supported on a foot 16, and a light source 18 carried by the stand 14. The light source 18 may for example be configured as a LED (light emitting diode) lightbulb unit screwed into an Edison socket 20 at the top of the stand 14. The light source 18 is enclosed by a translucent lamp-shade 22, which is releasably attached to the top of the stand 14 to facilitate replacement of the light source 18.

The stand 14 is configured as a loudspeaker unit, and will in the following be referred to as a loudspeaker unit. The loudspeaker unit 14 comprises a plastic housing 24 provided with perforations 26, which are in register with the audio output of one or more loudspeaker elements arranged inside the housing 24.

A loudspeaker cover 28, configured as a textile sleeve, encloses the housing 24. In the view of Fig. 1 , the loudspeaker cover 28 is, for clarity of illustration, illustrated with parts broken away to expose the housing 24. The loudspeaker cover 28, which completely encloses the mantle area of the housing 24, is elastically held to, and squeezes, the housing 24 by intrinsic elasticity of the textile, but is otherwise not attached to the housing. Thereby, the loudspeaker cover 28 is configured to be slid off the housing 24 for easy and tool-less replacement or washing in a manner which will be apparent in the following. A user interface, configured as a control knob 30 having dimmer and/or on/off switch functionality and penetrating the housing 24 and the loudspeaker cover 28, allows a user to control the light source 18.

Turning now to the exploded view of Fig. 2, the lamp 10 comprises, starting from the top, the lamp-shade 22, the light source 18, and the loudspeaker unit 14 comprising the loudspeaker cover 28, the housing 24, a loudspeaker assembly 32 arranged inside the housing 24, the control knob 30, and the foot 16. The loudspeaker assembly 32 comprises a woofer 34 and a tweeter 36, each facing a perforated portion 26 of the housing 24. . The tweeter 36 and the woofer 34 are both oriented to emit sound primarily in a horizontal direction, i.e. in a direction

perpendicular to the sleeve axis. The loudspeaker assembly 32 further comprises a battery and an audio amplifier (not illustrated) operably connected to each other, and each operably connected to receive power from the mains cable 12. The audio amplifier is also provided with a wireless communications interface (not illustrated) configured to receive streaming audio from a remote source, such as a smartphone, and a button 31 (Fig. 1 ) is provided on the foot for wireless pairing with another device (not illustrated).

Now with reference to Fig. 3, the loudspeaker cover 28 has a tubular cross- section extending along a sleeve axis A which, in the illustrated embodiment, coincides with an axis of rotational symmetry of the housing 24. The loudspeaker cover 28 exposes the foot 16 (Fig. 2) via a first, lower axial opening 38 of the loudspeaker cover 28, whereas the light source 18 (Fig. 2) protrudes out of the loudspeaker cover 28 via a second, upper axial opening 40 of the loudspeaker cover 28. An axial mid section 42 of the loudspeaker cover 28 has a greater width W1 than a width W2 of a lower axial end section 44. The width W1 of the axial mid section 42 is also greater than a width W3 of an upper axial end section 46. The loudspeaker cover’s 28 varying width along the sleeve axis A aids in gripping the housing 24 in a formfitting manner.

As is illustrated in the uppermost magnified portion of Fig. 3, the upper axial end section 46 of the loudspeaker cover 28 is weft knitted using a Stockinette knit. Weft knit is a knit in which each course of wales intermeshes only with the

immediately adjacent courses of wales, which results in an elastic knit. As is illustrated, the wrong/reverse side of the Stockinette knit faces outwards, and the right side, which is opposite the wrong side, faces the housing 24. Alternatively, the wrong side may face the housing 24. The knitted fabric gives an elastic character to the fabric of the upper axial end section of the loudspeaker cover 28. As is illustrated in a second magnified portion of Fig. 3, the axial mid section 42 is weft knitted using a double pique knit. The second magnified portion illustrates the stitch as seen from the right/front side, which preferably faces the housing 24, whereas the

reverse/wrong side of the stitch faces outwards, away from the housing 24. The lower axial end section 44 of the loudspeaker cover 28, a portion of which is illustrated in the lowermost magnified portion of Fig. 3, is ribbed by alternating stripes of Stockinette stitch and reverse Stockinette stitch. Even though the ribbing is illustrated as a 2x2 rib (alternating two consecutive right wales with two consecutive reverse/wrong wales along each course), other combinations, such as 1x1 rib, 1x2 rib, 2x1 rib, etc are equally possible. It is also pointed out that the alternating/ribbed character is not illustrated in the magnified portion. Thanks to the ribbing, the fabric of the lower axial end section 44 is even more elastic than the fabric of the axial mid section 42 and the upper axial end section 46, which facilitates threading the loudspeaker cover 28 over the housing 24 from above. As an exemplary alternative to Stockinette/reverse Stockinette ribbing, elasticity may be added by using Garter stitch. In alternative embodiments, the entire loudspeaker cover may be made in the same stitch, e.g. ribbed or unribbed Stockinette. Alternatively or additionally, a relatively higher elasticity of the axial end sections 44, 46 may be obtained by using a stitching yarn of the mid section 42 which is different from the stitching yarn of the axial end sections 44, 46.

Thanks to the elastic character of the fabric, no auxiliary attachment means, other than the intrinsic elasticity of the loudspeaker cover 28, are needed for attaching the loudspeaker cover 28 to the housing 24. For removing the loudspeaker cover 28 from the housing 24, the lower and upper edges 50, 52 of the loudspeaker cover 28, which edges 50, 52 define the respective axial end openings 38, 40, are loose, such that the user need only lift e.g. the upper free edge 52 off the housing 24 to get a firm grip, and pull off the loudspeaker cover 28 along the axial direction A. In order to provide a well-defined axial stop position of the loudspeaker cover 28, an upper end of the loudspeaker housing 24 is provided with a radially extending flange 56; however, the flange 56 is not configured to attach to the upper edge 52 of the loudspeaker cover 28, but merely acts as a support.

One manner of obtaining a coarse fabric, which adds to the sound

transparency of the loudspeaker cover 28, is to use a flatbed knitted fabric for the loudspeaker cover 28. The loudspeaker exemplary loudspeaker cover of Fig. 3 may be flatbed knitted with a knitting gauge of between 5 and 18 stitches per inch, more preferably a gauge of 8 to 16, and typically about 12 stitches per inch. Thereby, a lateral wale separation d approximately corresponding to between 5 and 18 wales per inch, more preferably 8 to 16 wales per inch, and typically about 12 wales per inch, may be obtained. A typical knitting yarn 54 may have a linear density of between 120 dtex and 220 dtex, for example about 167 dtex. Typically, the yarn 54 may have between 24 and 48 filaments, such as 36 filaments, which may be of multi- or single-fibre type. The axial end sections 44, 46 of the loudspeaker cover 28 may be knitted with a yarn comprising a mix of polyester and elastomer fibres, and/or with alternating courses of strictly elastomer fibre based yarn and polyester yarn. A typical elastomer fibre suitable for the purpose is elastane/spandex/Lycra. In particular, in order to even further enhance the elasticity of the lower axial end section 44, a fraction of the courses 53b of polyester based yarns 54b overlaps with a respective course 53a of elastomer fibre yarn 54a. In the illustrated embodiment, one of four courses 53b of polyester based yarn 54b overlaps with a respective course 53a of elastomer fibre yarn 54a, such that the four-course pattern of the magnified portion repeats in the vertical direction. Moreover, the elastomer fibre yarn 54a may skip a fraction of the wales 55b of the polyester based yarn 54b; in the illustrated

embodiment, the elastomer fibre yarn 54a forms a wale 55a at every two wales 55b of the polyester based yarn 54b. Axial rim portions, at lower and/or upper edges 50, 52, may be knitted using elastomer fibre yarn 54a only, such that the axial edges 50, 52 will more firmly grip the housing 24. The axial mid section 42 could be knitted with a yarn free from elastomer fibres, such as a 100% polyester yarn.

Fig. 4 illustrates a loudspeaker unit 114 according to a second embodiment. The loudspeaker unit of Fig. 4 differs from the loudspeaker unit 14 disclosed with reference to Figs. 1 -3 in that the housing 124 does not have a light source socket at its top, and does not operate as a lamp stand. Instead, the loudspeaker unit 114 is free from auxiliary equipment at its top, and hence, the loudspeaker cover 128 is closed at its top axial end 140. Moreover, the loudspeaker unit 114 does not have any ribbing at its lower axial end.

Fig. 5 illustrates a method of renovating a loudspeaker unit, such as any of the loudspeaker units 14, 114 described in detail hereinabove. The method comprises:

In step 501 , sliding off a first loudspeaker cover from a housing comprising a loudspeaker;

In step 502, providing a second loudspeaker cover, configured as a textile sleeve extending along a sleeve axis and comprising an axial end opening;

In step 503, inserting the housing into the textile sleeve via said axial end opening; and

In step 504, allowing the textile sleeve to elastically engage with the housing.

The first and second loudspeaker covers may be of different character. For example, they may have different colours or ornamental patterns. The above method may also be employed when taking off a loudspeaker cover from the housing for washing, for example for washing the loudspeaker cover in a machine or by hand.

The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims. For example, knitted loudspeaker covers have been disclosed in detail. The loudspeaker cover may comprise or be made of another type of textile, such as a woven fabric.

In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.