Talk:Loudspeaker enclosure

Leaks In Acoustic Suspension

I would like to see a reference where the principle behind your theory on acoustic suspension cabinets needing leaks can be found. I have never heard of this and would like to be sure it is accurate. Most people spend a painstaking amount of time to insure there are absolutely no leaks in their AS systems.

Thank you

The spacemonkey

I've seen it referenced in severl DIY design rationales for sealed boxes, eg Linkwitz's Pluto+ subwoofer design. But more importantly, most speakers have some air leaks, through the magnet structure/dust cap, or the surround or the cone itself. So in those cases, barometric pressure changes will not bias the position of hte voice coil in the gap. But for speakers with rubber sourrounds, plastic cones and dust caps, it's possible to have sufficiently low leakage that the speaker becomes a barometer or sorts, with the bias position and slow motion of the cone bias being an indication of air mass movement into and out of your location. The leakage path, intentional or not, should be, of course, quite small, such that the resistance to air flow is high enough that, at audio frequencies, the enclosure is effectively fully sealed. ww 21:00, 18 February 2007 (UTC)

Diagrams facing random directions

The diagrams are potentially confusing, because they vary randomly having the front of the speaker facing left or right. At first glance, I thought the passive radiator" had the speaker cone facing the back and radiated from the box. And in the compound or band-pass speaker, it's even less obvious which is the front.

Some of these should be flipped so that they all have the front facing the same way. It may also be necessary to indicate the front with an arrow or label, but hopefully this can be avoided.

I suggest the speakers all face left, into the text of the article. —Michael Z. 2007-05-30 21:57 Z

Heh. It's only taken a year, but I believe the issue is fixed. Binksternet (talk) 19:14, 4 June 2008 (UTC)

Cabinet resonance and panel resonance

There doesnt seem to be much here on 'cabinet resonance' (ie system resonance due to the air in the cabinet) and its prevention. Nor is there anything on panel resonances (resonances of the panels themselves). I dont know enough to add this material at the moment. But Im asking on the Ref Desk.--Tugjob 15:21, 22 June 2007 (UTC)

Neither of the resonances you note can be prevented. What can happen, and in good designs does happen, is that the energy that 'wants' to be stored in those resonances can be damped/absorbed to a point that it is so low in level as to not be a problem. And, in some enclosures, the air in the cabinet and its motion are part of the design (eg, bass reflex) and shouldn't be prevented. Likewise for transmission line enclosures, though things are more complex with them. Panel resonance is always a problem, though. See Art Ludwig's site for the physics of such matters, to the extent we have exact accounts of them, and any of a multitude of DIY sites for ideas and approaches. One with a variety of quality designs, pictures, and some discussion is Humble Homemade in Holland (Tony Gee's site).

Note, however, that the ease of posting material on the Net makes it easy for the obsessive to post too. Try to avoid getting tangled in the wilds of magic cables, magic speaker stands, magic capacitors, ... Rod Elliot's (Elliot Sound Products) DIY site has several sensible essays on one or more aspects of some of the snake oil that's oozing around out there. SEAS (and ScanSpeak -- or is it the other way round?) even have some designs for DIY folks. they name them after Norse Gods... ww (talk) 21:41, 4 June 2008 (UTC)

Photo

Let's get a photo of an empty, unloaded enclosure. I think it would illustrate the point better. Binksternet (talk) 17:17, 22 October 2008 (UTC)

Something like these photos of a naked wood DIY subwoofer project in progress:

ProSoundWeb LAB subwoofer project photos by Jeff Bailie. Binksternet (talk) 17:21, 22 October 2008 (UTC)

Or these photos of a mid-bass box:

ProSoundWeb USB project photos by Lasse Lukkari. Binksternet (talk) 17:24, 22 October 2008 (UTC)

You just hate everything I do, don't you Binksternet?

If I can see that an article needs improvement then I say something. The photo of a loudspeaker with a wire hanging out the front and a completely different woofer stuck into it is not serving as the optimal example of "loudspeaker enclosure". Because the selected replacement woofer is nowhere near the correct T/S parameters for the box as originally designed, the photo serves as an example of "hit-or-miss DIY audio", "loudspeaker experiments using what's on hand" or "field repairs of audio gear". There's no article for those subjects, so the photo doesn't seem to fit anywhere yet.

When I see you do things that are good quality, I let them stand. I've got no personal problem with the things you do. Binksternet (talk) 20:07, 19 November 2008 (UTC)

Then put those ones on there if there so good. What's stopping you? Daniel Christensen (talk) 04:14, 8 January 2009 (UTC)

The images I linked to aren't freely available for Wikipedia to use, as far as I can tell. Binksternet (talk) 07:01, 8 January 2009 (UTC)

here's a better photo-your move.....

Image sizes

What's better for people: this version of the page with hard-coded pixel sizes of images, or this version with scaled sizes, using the "upright" parameter in the extended image syntax? I think hard-coded image sizes aren't good for the wide variety of people who come read the page with an equally-wide variety of browser window sizes, screen resolutions, thumbnail preferences, etc. Binksternet (talk) 20:10, 5 November 2009 (UTC)

Grille description

I came here looking for at least a couple of paragraphs discussing the purpose of the grille, and why they are often removable, even on things like small, cheap computer speakers. This seems the most appropriate page for it, yet there's not one mention of grille currently. Thanks. 66.90.186.197 (talk) 18:16, 8 February 2010 (UTC)

OK, just found coverage of the speaker grille elsewhere. It'd still be nice for the enclosure page to mention grilles and link to the page, because a grille is generally present on most speaker enclosures. 66.90.186.197 (talk) 18:18, 8 February 2010 (UTC)

Paul G. A. H. Voigt

I can't believe en.wikipedia doesn't have a page for this audio inventor - de. and nl. do ! Brought stereo sound to the UK, Invented horn speaker and Voigt pipe, Moving coil pickup/cutter, electrostatic microphone, In 1974 he was honoured with the Fellowship of the Audio Engineering Society at their New York Convention... --195.137.93.171 (talk) 22:00, 18 September 2010 (UTC)

Waveguide section

I tried splitting Tweeter from Woofer section, but my internet is playing-up. There's some scope for some interesting stuff for horns vs waveguides here - constant directivity, oblate spheroids ... Waveguide (acoustics) is inteesting for transmission not emission. --195.137.93.171 (talk) 08:00, 21 November 2010 (UTC)

Pipes and Bose

Concerning transmission lines and pipes... In the DIY community at least, the terms are used pretty much interchangeably. What is the justification for saying a 1/4 wave pipe is not a "true" transmission line? Would it not be better just to explain how the two terms are commonly used?

The assertion that pipes are typically larger than bass reflex enclosures needs justification and clarification. Does the assertion refer to length or does it mean enclosed volume? The pipe can be folded up.

I think the sections on transmission lines and tapered quarter wave pipes should be merged.

Someone needs to rework the whole thing. M.J. King is the man to do it, if he can be persuaded.

The part about Bose is wrong. Follow the link in the footnote and you'll find the "Acoustic Waveguide" described in advertisements on the Bose web site. It is not a tapered pipe. It is a straight 1/4 wave pipe, driven at the closed end, and tuned to around 40Hz. Here is the patent: http://www.freepatentsonline.com/6278789.pdf It is not clear to me what the patent covers that was not prior art in 2001. Disclosure: I rather dislike giving Bose any mention. Jive Dadson (talk) 20:10, 10 January 2011 (UTC)

Acoustic suspension rare?

The wikipedia article on acoustic suspension says that such systems are very popular. http://en.wikipedia.org/wiki/Acoustic_suspension The section here says they are not. One of the articles is wrong, and I think it's this one. If you define acoustic suspension systems as sealed boxes where the enclosure volume is less than the driver's Vas, then they are quite popular. What IS the definition? I do not think there is one, really. Isn't it more a marketing term of Acoustic Research (AR)? Jive Dadson (talk) 20:35, 10 January 2011 (UTC)

Tapped_horn, a version of the Loudspeaker_enclosure page?

How come this page also has an alternative URL of http://en.wikipedia.org/wiki/Tapped_horn ? — Preceding unsigned comment added by Eyleron (talk • contribs) 19:40, 19 April 2011 (UTC)

Images

Most of the images, including the MTX boxes at the top, which is mine, are terrible. I was just putting them there for now because no one seemed to have anything better to offer at the time. I just added another mediocre image to voice coil becuase there are no others. To avoid brand name issues, I think quality pictures of good quality home made stuff is best for these articles. Daniel Christensen (talk) 01:12, 9 July 2011 (UTC)

My gawd, all of my pictures are still here. Daniel Christensen (talk) 19:06, 18 February 2012 (UTC)

The section on Horn speakers completely overlooks back loaded horns. Since full range backloaded horns are popular for DIY because they require no crossover they should be included in this article — Preceding unsigned comment added by 122.57.224.37 (talk) 04:43, 16 September 2012 (UTC)

Resonance

Its worth mentioning that while resonance can increase bass output and thus extend bass response, it also causes a time domain distortion, and that for bass reflex designs in particular this has often proved objectionable. Tabby (talk) 01:22, 17 April 2013 (UTC)

It is certainly worth talking about resonance—absolutely. Do you have a reference for extended bass response? My gut feeling is that the cabinet would be louder with increasing resonance, but not necessarily lower extension. Binksternet (talk) 01:34, 17 April 2013 (UTC)

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Jason P Jackson (talk) 07:36, 8 September 2018 (UTC)== Transmission Lines ==

This section needs amendment. "too much stuffing can cause reflections due to back pressure" is false. Excess stuffing prevents adequate output at the transmission lines exit. "They can be thought of as a waveguide which the structure shifts the structure of the driver's rear output by at least 90 degrees" is false. The output at the exit around resonant frequency is in phase with the driver reinforcing those frequencies. This is in the same manner in which a reflex enclosure operates. — Preceding unsigned comment added by Jason P Jackson (talk • contribs) 07:34, 8 September 2018 (UTC)

"Acoustic systems" listed at Redirects for discussion

A discussion is taking place to address the redirect Acoustic systems. The discussion will occur at Wikipedia:Redirects for discussion/Log/2021 February 1#Acoustic systems until a consensus is reached, and readers of this page are welcome to contribute to the discussion. _signed, Rosguill ^talk 17:10, 1 February 2021 (UTC)