I've just bought a new Pioneer TS-W308D2 dual 2 ohm VC subwoofer. This is the first sub I'm building an enclosure for so I wanted to keep it simple the first time around and stick with a sealed box to keep things easy and relatively foolproof. I may go ported in the future but that's another build for another time.

I have two different 2 channel amps (Kenwood KAC7204 ~500 RMS bridged 4 ohm for the subwoofer and an Earthquake T1000W/2 ~200 RMS x 2 channels 4 ohm for the 6.5" comps that I'm putting in the front doors (I'll keep the gains turned well down on the amp to the 6.5 comps).

I've looked at the Pioneer manual for the sub and it has the following stats for a sealed enclosure:

Minimum Sealed enclosure size: 0.85 cubic feet
Maximum Sealed enclosure size: 1.75 cubic feet
Recommended Sealed enclosure size: 1.25 cubic feet
These sizes include the speaker displacement.

Here are all the Thiele stats for the sub:

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 [Ω] DUAL1.5
Levc [mH] (2000Hz) 2.18 (4Ω 0.65 (1Ω
Xmax [mm] 8.7
Xmax [in] 0.34
Zmax [Ω] 99.13 (4Ω 24.81 (1Ω
BI [Tm] 16.07 (4Ω 8.04 (1Ω
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 also ran the numbers through WinISD and it calculated that the optimal sealed enclosure size for this sub is 1.093 cubic feet and gave the optimal box size as follows:
13.95" wide
21.46" high
8.93" deep

I'm using 18 mm thick MDF to build the box which is equivalent to 0.71 inches.

What I'm wondering as I'm new to this is which size within this range would be best for a sealed enclosure. Pioneer gives a large range of sizes to use from 0.85 to 1.75 cubic feet and their recommendation is basically right in the middle of that range @ 1.25 cubic feet whereas WinISD gives an optimal of 1.093 cubic feet.

What is the benefit of going as small as 0.85 cubic feet or as large as 1.75 cubic feet?

I'm basically looking for 50-50 SQ/SPL and I realize going sealed vs ported is giving up some SPL hopefully in favor of some SQ... and that's fine with me for this first build. What I'd like to know though is how the size of the enclosure within that range from .85 cubic feet to 1.75 cubic feet effects the SQ and SPL.

What size would you all recommend? What would sound the best and make optimal use of the sub for SQ/SPL in a sealed enclosure? Any advice is appreciated. Thanks in advance.
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Exile son of Exodus
First for the weight of that sub the baffle should be no less than 1" thick. For that matter the entire enclosure. i had 2 of them but never got to use them before I sold them. I would go with 1.25 - 1.50 after bracing and displacement.
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Master Yoda
I think the answer to you question is as follows:?

the smaller enclosure should give you more power handeling but at a higher Hz the larger will lower power handeling some but be tuned lower I also would say around 1.25cf and if you would like it tuned lower you could add some polyfil to the box this will make the sub act as if it is in a larger box and should help some or you can add wood to the inside of the box to inprove the handeling a little bit. my recomendation is to start around 1.25cf then make small adjustment till you get the sound that you are looking for. keep in mind that it is easier to make a box smaller then it is to make it larger!
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