Talk:Loudspeaker enclosure

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[edit] 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)

[edit] 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)

[edit] 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 the 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)