Builders... Designers... A topic to debate.

[joeldirt 10+ year member]

There are instances where a multi chamber enclosure would have better SQ then a shared one;
Say we have a long enlcosure in a pickup housing 4x 10's sealed, it's ~4' long, if it was a shared enclosure you could have a standing wave problem ~70hz (4' is 1/4 wavelength of 70hz), if each driver was in it's own chamber the quarter wave frequency would be pushed up to well over 200hz, out of the band we are using the drivers for.

interesting...

 

[hofulstrof 10+ year member]

There are instances where a multi chamber enclosure would have better SQ then a shared one;
Say we have a long enlcosure in a pickup housing 4x 10's sealed, it's ~4' long, if it was a shared enclosure you could have a standing wave problem ~70hz (4' is 1/4 wavelength of 70hz), if each driver was in it's own chamber the quarter wave frequency would be pushed up to well over 200hz, out of the band we are using the drivers for.

totaly forgot to mention this. yes good point

 

[PV Audio 5,000+ posts]

Totally forgot to mention? I don't even understand what the **** he's talking about //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

 

[hofulstrof 10+ year member]

edit

 

[hofulstrof 10+ year member]

Totally forgot to mention? I don't even understand what the **** he's talking about //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif

standing waves

 

[PV Audio 5,000+ posts]

Oh, I am just not the shurpest nyfe in deh drawar.

 

[James Bang 5,000+ posts]

1) What do you think the most likely cause of the first sub blowing was ?2) Have you ever heard what it sounds like when one sub blows in a common-chamber enclosure ?

Answers:

1) Too much power

2) No, otherwise you'd know that you'd know right away if one of the subs were blown. In this case, separate chambers would offer you the convenience of being able to use the other sub(s) while the other one was getting replaced/repaired. However, this in no way means that it offers more protection, unless you have extremely slow reactions, are completely deaf, or are operating the sound system while being away from the vehicle.

On the flip side, if you're operating a separate chamber enclosure, you may not realize that one sub is blown and, since most people bridge their amplifiers and most amplifiers output more power per sub at a higher impedance, the likelihood of blowing the other sub would increase as well.

i.e.

500 w @ 4 ohm

900 w @ 2 ohm

1500 w @ 1 ohm

Two dual 4 ohm subs wired in parallel-parallel, each receiving ~750 watts. One blows, the other sub is now receiving ~900 watts.

tis why my example consisted of a 2 channel amp //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[req 5,000+ posts]

i love you james //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

my only reason for having a dual chamber box would be for the benificial support lended from the added internal wall, and if i only had one sub at the time, but planned on upgrading to two in the future - or just that added idea of if one got stabbed by a air jordan in the back that only one sub would suffer mechanical damage due to circumstantial problems.

as far as how it sounds?

i believe it sounds exactally the same as a shared chamber.

 

[James Bang 5,000+ posts]

And how many people run their sub amplifiers in 2-channel mode ? Maybe 1% of the forum members at best ?

If I were to change my setup, it would consist of an amp in two channel mode. before I do that i'll need to pick up a pair of IDs or IDQs run them off my ID amp //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif and put them in a seperate chambered box. //content.invisioncic.com/y282845/emoticons/yumyum.gif.0556df42231b304b9c995aefd13928a8.gif