boxmen

southside connections · Posted: Sun Jul 20, 2008 9:58 pm Post subject: boxmen

well i understnad the relation of vas vs box size, but has anyone ever built a box based directly on the vas of a speaker?

eg-
speaker vas-128liters
thus-1cuft=28liters
therefore vas(cuft)= 128 devided by 28
=4.5cuft +(speaker and port displacement)

so given the above example,has anyone ever done it?and if so what were noticeable benefits of it?

let me hear the box men and please try not to spam even though it is iresistible

Chiney · Posted: Mon Jul 21, 2008 12:36 am Post subject:

well i did... for my type R 12"..

45L
so i did a 1.6 box and WOW! everyone waz like.. wat sub u got there..its really low and clean..and got some nice volume..

showed them the R in the back seat peeping out.. then pops the trunk..when man see that box they like EH Shocked

so small??

reason i tried the VAS thingy...and not just build and tune to manu. specs.. is because i saw this same thing on steve meade forums..and did a bit of reason up on it.. found out that ppl tend to get the best efficiency out of a sub wen built on the VAS specs and tuned frequency required..

i might be understanding it wrong.. but didnt fail me that time !!

i did something similar for my RE 15" box..

maybe some build pics tmr and i wanna have the system install to try it out asap. and then i`ll kno how successful i waz this time again Mr. Green

southside connections · Posted: Mon Jul 21, 2008 10:37 am Post subject:

i dout is just me and chiney buildin box on d forum ehh

demboyzaudio · Posted: Mon Jul 21, 2008 10:50 am Post subject:

maybe some dont know and the rest stil have to come online.

jeff · Posted: Mon Jul 21, 2008 10:50 am Post subject:

because it may work for one sub you cannot build a box based on one thiele alone

wikipedia has a good read on thieles, and if understand what they are, u will realise why one thiele is not enough to 'guestimate' a box on

Chiney · Posted: Mon Jul 21, 2008 11:48 am Post subject:

^^ same thing i waz saying at well..

wat about just building the recommended enclosure and done? and tune it to what they say?

shouldnt one expect optimum performance?

riadb · Posted: Mon Jul 21, 2008 1:20 pm Post subject:

building a box that is equivalent to the compliance of the driver provides a perfect acoustic spring for the driver as the pressure required to compress a given volume of air (VAS) into the enclosure is equivalent to the mechanical resistance of the drivers suspension & spider...

In theory it is supposed to provide accurate transient response with virtually no cone lag / response delay.

jeff · Posted: Mon Jul 21, 2008 2:41 pm Post subject:

riadb · Posted: Mon Jul 21, 2008 3:01 pm Post subject:

*fixed*

sorry jeff...i forgot to quote you

loudsound · Posted: Mon Jul 21, 2008 11:21 pm Post subject: Re: boxmen

Chiney · Posted: Mon Jul 21, 2008 11:27 pm Post subject: Re: boxmen

loudsound · Posted: Tue Jul 22, 2008 1:22 am Post subject: Re: boxmen

Chiney · Posted: Tue Jul 22, 2008 1:32 am Post subject:

^^ its still 1 VERY important spec..

Wink

loudsound · Posted: Tue Jul 22, 2008 1:33 am Post subject:

hmmm but i now looking at what alyuh saying...but it dont make sense...
lets look at a RF T2 12"
the VAS on this sub is equal to 26.4 liters
as you guys stated 1 cubic ft = 28 liters
soooo...
26.4/28 = 0.943 cubic + sub and port displacement...

hmmmm
i dont think that makes sense...
do you? a T2 12 in a .943 cubic box Shocked

Chiney · Posted: Tue Jul 22, 2008 1:43 am Post subject:

.93 to be exact from RF's specs.

this is very interesting one..

time i clear my head of the stuff i kno or read on VAS and let it be explained properly..

im confused now.. unless RF made a mistake?

loudsound · Posted: Tue Jul 22, 2008 1:52 am Post subject:

the VAS of a 9512 MTX is 25.57 liters
soo 28/25.57 = 1.09 cubic

still makes no sence RF and MTX wouldnt make the same mistake...
will they?????

Chiney · Posted: Tue Jul 22, 2008 1:55 am Post subject:

ok.. so im confused now!!

hmm.. does the mtx have a 4" voice coil?

loudsound · Posted: Tue Jul 22, 2008 2:03 am Post subject:

pyromaniax · Posted: Tue Jul 22, 2008 2:10 am Post subject:

loudsound in ur two calculations i believe u did something different than the other.

in the first i divided 26.4 by 28 and in the 2nd u divided 28 by 25.57. i believe from SSC post the MTX suppose to be

25.57/28= 0.913 cubic ft Shocked

Chiney · Posted: Tue Jul 22, 2008 2:10 am Post subject:

i notice thats a common thing among the 2
i wonder if a 4" vc has anything to do with it...