Getting the sub... now help me build my sub box.

 

Bronze Member
Username: Boomboomboom

New Zealand

Post Number: 13
Registered: Nov-06
Ok so I'm getting a Pioneer TSW308D2 sub and I want to build a box for it.

Here's the Thiele stats for this sub from the Pioneer website:

http://www.pioneer.eu/uk/products/25/131/201/TS-W308D2/specs.html

Nom. Dia.(In) 12 .
Qts 0,48 .
Qms 14,11 .
Qes 0,50 .
Fs [Hz] 33,7 .
Vas [l] 36,16 .
Vas [ft3] 1,28 .
Vd [l] 0,400 .
Vd [ft3] 0,01412 .
Sd [m2] 0,04597 .
Sd [ft2] 0,495 .
Revc [U] DUAL1.5 .
Levc [mH] (2000Hz) 2.18 (4U)
0.65 (1U) .
Xmax [mm] 8,7 .
Xmax [in] 0,34 .
Zmax [U] 99.13 (4U)
24.81 (1U) .
BI [Tm] 16.07 (4U)
8.04 (1U) .
Rms[Ns/m] 2,773 .
Mms [g] 184,95 .
Cms [m/N] 0,00012 .
Mg.Wt.[g] 2350 .
Flux Density [Gauss] 6800 .
Hag [mm] 10 .
Hag [In] 0,39 .
Hvc [mm] 27,4 .
Hvc [In] 1,08 .
VC.Diameter [mm] 55 .
Eff [%] 0,27 .
S.P.L. [dB] 91,0 .
R.M.S.Power [W] 400 .
M.M.P. [W] 1400 .
Sp. Displacement [l] 2,16 .
Sp. Displacement [ft3] 0,076 .
Recom. Enclosure [l] 35,4 .
Recom. Enclosure [ft3] 1,25 .
F0 (in Cabinet) 47,9 .
Q0 (in Cabinet) 0,682


I'm going to be bridging a 2 channel amp to push somewhere between 400-500 RMS at the sub which should give it decent power.

From the Pioneer Sub Manual here:


http://www.pioneerelectronics.com/StaticFiles/Manuals/Car/TS-W308D2_InstructionM anual1120.pdf


it gives the following minimum and maximum box sizes for a sealed setup:

0.85 cubic feet to 1.75 cubic feet. They recommend a sealed box size of 1.25 cubic feet. This is right about in the middle of the minimum and maximum range.

So I went and downloaded the WinISD program and put in all the Thiele numbers and it spat out the following optimal sealed box size for me:

1.091 cubic feet
Optimal box shape for a cube shaped box:
13.94" wide
21.45" high
8.93" deep

I'm using 1.8 cm (.709")thick MDF board to build the box.

So my question is... which recommendation is better... the recommended size from Pioneer or the recommended size from the WinISD program?

From you all here that have built hundreds of boxes before :-)... who should I listen to... or do you all have other recommendations taking into account all those Thiele numbers shown above?

I think I basically want 50/50 SQ/SPL sound. It should sound good and it should sound loud :-) ...if possible. :-)

By the way here's the ported recommendations from Pioneer for this sub as well:

Ported Maximum box size is 2.05 cubic feet with a maximum port hole opening of 3" diameter x3" (odd that the "maximum" port size is smaller than the minimum port size... is this normal or is this a typo?)
Ported Minimum box size is 1.25 cubic feet with a maximum port hole opening of 3" diameter x8"

The Pioneer optimal recommendation for a ported box is: 1.65 cubic feet and a port hole opening of 3" diameter x6"

The WinISD program spits out these optimal numbers for a ported box:

2.266 cubic feet with a tuning frequency of 28.21 Hz

Opimal ported box shape:
17.39" wide
26.98" high
11.00" deep
The port hole size is 4.02" diameter with a length of 15.65" and the ported box has a vent mach of 0.10

There's a chance I inputted the stats into WinISD incorrectly for the sub as I'm not that familiar with the program and some stats I wasn't exactly sure of.... example Re in ohms, I used 1.5 but was I supposed to use 3.0 as this is a dual voice coil sub so should I double that figure?


These are the inputs I used to enter into the WinISD program. Did I convert them correctly from the Thiele stats provided by Pioneer?

Qts 0.48
Vas 36.2 Litres
Fs 33.70 Hz
Re 1.50 ohm
Le 2.18
Xmax 0.009 metres
Z 99.13 ohm
Qms 14.11
Qes 0.50
SPL 91.00 dB
Pe 400.0 Watts
BL 16.07
dia 0.055 metres
Sd 0.046 metres^cubed


So which out of all these recommendations has the best potential SQ/SPL setup? There seems to be quite a variation especially in the ported box figures between the Pioneer recommendations and the WinISD calculations.
 

Silver Member
Username: Gcs8

Atlanta, Ga

Post Number: 162
Registered: Sep-09
talk to bassman3 he can eather build you one or make you a cut list.
 

Gold Member
Username: Dustin3

D&L Audio Tech.Dustin

Post Number: 5228
Registered: Oct-05
To answer your first question whether or not you should go by winISD or what pioneer recommends, it appears that pioneer recommends 1.25 and winISD recs ~ 1.10 cubes. That's .1 of a difference and it doesn't really matter. 1.25 should be fine if you were to go sealed.

and do they not have your pioneer on file on winISD? if not i cannot remember which values your suppossed to enter off the top of my head, i dont use winISD (Unibox FTW) i believe the values your supossed to enter is Qms, Qes, fs, mms, re, pe, xmax and Le. Not 100% positive though, Unibox is more user friendly.

If you are interested in a box design and a cutlist you can always send me an email.
 

Bronze Member
Username: Boomboomboom

New Zealand

Post Number: 14
Registered: Nov-06
Sent you an email Bassman. So does this sub suit a sealed box or a ported environment or is it really up to the individual?
 

Bronze Member
Username: Boomboomboom

New Zealand

Post Number: 15
Registered: Nov-06
WinISD doesn't have my subs stats in it (neither does the Unbibox database as far as I can tell). I think it's a reasonably new sub so that may explain why the stats aren't in there yet.
 

Gold Member
Username: Dustin3

D&L Audio Tech.Dustin

Post Number: 5230
Registered: Oct-05
it's up to the individual. if your lookin for spl, ported would be best
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