Posted 07 Aug 2002 - 00:43
I only put in a layer of 1 inch thick all around, but I'm sure the box has an "echo", so I'm assuming I need a bit more.
I can remember a few months ago, a magazine filling the box with fluff from a habadasherers shop, and I thought how does the sound get out. They must have gone over board surely with that much. <img border="0" title="" alt="[Eek!]" src="eek.gif" />
Focal Polyflex 165H Components
JL 10w3-D2, wired 1Ohm
Efmax sealed twin chamber SQ+ box
Directed 600d Mono for sub
Phoenix Gold XS2200 for fronts
Posted 07 Aug 2002 - 01:49
Posted 07 Aug 2002 - 02:43
Posted 07 Aug 2002 - 03:13
Posted 07 Aug 2002 - 03:48
all it does is trick the speaker into thinking its in a larger then average box because the airflow inside the box is slower than normal
Posted 07 Aug 2002 - 16:18
I paid £10 at my local ICE store for a meter square of 'sub box wadding' is this the same stuff?
Posted 07 Aug 2002 - 16:27
When using make sure it is not too near the rear vent on the sub as i have seen a couple of subs trashed by this stuff being pulled into the sub through the rear vent!!!
The Damn loud Blue Van
Posted 07 Aug 2002 - 16:53
Theres place in south leicester that sells it.. although I havnt bought any for quite some time!!
Baz <img border="0" title="" alt="[Wink]" src="wink.gif" />
Posted 07 Aug 2002 - 19:37
Posted 07 Aug 2002 - 23:32
Posted 07 Aug 2002 - 23:43
<strong>they say your sub should never be parallel to the back because of the soundwave problem. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">garrrr shit. <img border="0" title="" alt="[Frown]" src="frown.gif" />
Posted 08 Aug 2002 - 00:14
As for standing waves re the baffle and rear panel being parallel, not likely. At low bass frequencies standing waves do not form within the enclosure, well, unless your enclosure plays upto 100Hz, say, and the distance between parallel surfaces is about 3.5 metres! (1/2 wavelength relative to the frequency in question).
Confucius...Our glory is is not in never failing, but in getting up every time we do
Posted 08 Aug 2002 - 00:14
<strong>they say your sub should never be parallel to the back because of the soundwave problem. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I dont think thats true (although I have no evidence). The JL purist box design for my 15W6 suggests a rectangular box where the sub plane is parallel with the back. And I kinda trust JL
Posted 08 Aug 2002 - 00:17
Your also not supposed to put the speaker in the centre of the baffle, it should be off to 1 side or corner, again i doubt you will hear the difference.
Posted 08 Aug 2002 - 00:23
Posted 08 Aug 2002 - 04:25
If a distance is less than the 1/8th wave it's a true pressure field. But in order for resonances to be significant you usually have the 1/2 wave distance... for subs.. or even mids in most cases... this is unlikely to occur.
Peaks in response can be due to all sorts of cancellations and resonances though, in a car we're faced with a myriad of problems to attack.
As K says build the box right in the first place.
The wadding will abosorb shuffing noises from the sub to some extent though, which in a ported box may be useful.
"On the contrary, you see everything. You fail, however, to reason from what you see"