Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
||Thread Tools||Search this Thread|
|4th January 2010, 12:02 AM||#1|
Join Date: Jan 2010
Help wanted building an optimal sealed box for a single 12" subwoofer.
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
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)
Mms [g] 184.95
Cms [m/N] 0.00012
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:
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.
|4th January 2010, 05:47 AM||#4|
Join Date: Aug 2003
"What is the benefit of going as small as 0.85 cubic feet or as large as 1.75 cubic feet?"
The smaller enclosure will have higher machanical powerhandling, less low end response and likely a peak around resonance, the larger one will have less mechanical powerhandling, a smoother response, and more bottom end.
I have experience using these in car tuned TL's and tapped horns if you have the space for the (much) larger enclosure. (for later)
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Need help for building 8" subwoofer box||pradeeppk||Subwoofers||4||17th October 2009 10:05 AM|
|Which 12" sub for sealed box||rca9449||Subwoofers||1||10th September 2007 09:26 AM|
|DAYTON RSS315HF-4 12" sealed box size?||Daveis||Subwoofers||2||17th August 2007 12:33 AM|
|building a 12" sub box||waz||Subwoofers||7||3rd March 2005 09:20 AM|
|suggestions; looking for shallow 10 or 12" woofer to work in small sealed box||zuki||Multi-Way||6||1st April 2004 06:21 AM|
|New To Site?||Need Help?|