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Old 26th September 2010, 03:14 PM   #1
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Default I impulsively bought this woofer...

I impulsively bought this woofer at a swap meet. Price was right and it's new. There's glue over the mounting holes. What should I do with it? I was thinking about building a home theater sub with the driver in side and ported out the front.

Sub800 Specs:

Diameter________18"
Impedance_______8ohm
Sensitivity_______99db
Response________25-1,500 Hz
RMS power_______800w
Peak power______1600w
Voice coil________4"
FS______________30hz
Qts_____________0.22
Qms____________10.0
Qes_____________0.23
Vas_____________350L
xmax____________8mm +/-
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Old 26th September 2010, 03:49 PM   #2
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What will you be using to drive this?
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Old 26th September 2010, 04:00 PM   #3
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Buy some HOME earthquake insurance and some Q-tips to sop up the blood running from your ears....LOL

GOOD luck and I wish you the best with your design, please post PICs when done. THANKS
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Old 26th September 2010, 04:00 PM   #4
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Originally Posted by chris661 View Post
What will you be using to drive this?
Dayton HPSA500

Dayton HPSA500 500W Subwoofer Amplifier | Parts-Express.com

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Originally Posted by Krisfr View Post
Buy some HOME earthquake insurance and some Q-tips to sop up the blood running from your ears....LOL

GOOD luck and I wish you the best with your design, please post PICs when done. THANKS
Will do. The box will be braced MDF, 6 cubic feet, and ported. 6" port roughly 5" long. puts me about 36.71hz. I'm shooting for 36.71hz (D1) because it's in the middle of a musical scale. "A0" being 27.50hz and "G1" at 49hz. This "logic" has resulted in some very "musically sounding" subs for cars. I hope it works out as well for a home system. It scales higher octaves quite well. I'm going completely by ear. Meter readings don't impress me. I've heard subs that look great on paper, rumble the walls watching movies, but are worthless when it comes to music.

Last edited by lazzer408; 26th September 2010 at 04:12 PM.
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Old 26th September 2010, 04:05 PM   #5
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Oh dear! 99db sensitivity and 800w power handling?
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Old 26th September 2010, 04:05 PM   #6
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It's a PA bass speaker. It needs a big ported box and even then it will struggle to hit the real lows. It will be very loud though! The other option which is probably better for a movie sub is to make a sealed box and add loads of EQ.

A 12 inch proper sub driver will probably perform as well if not better and in a smaller box...
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Last edited by richie00boy; 26th September 2010 at 04:07 PM.
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Old 26th September 2010, 04:12 PM   #7
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So, plenty of power.

I'd agree with richie that a small sealed box would be best for a HT... Unless space isn't an issue. Even so, I doubt you'd get lower than 30Hz when ported. EBS would be out of the question (again, space considerations).

The other option, of course, is to put it in your car.
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Old 26th September 2010, 04:15 PM   #8
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Originally Posted by richie00boy View Post
It's a PA bass speaker. It needs a big ported box and even then it will struggle to hit the real lows. It will be very loud though! The other option which is probably better for a movie sub is to make a sealed box and add loads of EQ.

A 12 inch proper sub driver will probably perform as well if not better and in a smaller box...
Correct in both. It's all for DIY fun though right? I listen to music more then I watch movies. Deap rumble isn't very important to me. Bass guitar is and I think this sub will work great for that.

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The other option, of course, is to put it in your car.
Already measured. lol It's not going to happen.
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Old 26th September 2010, 04:19 PM   #9
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A 12 inch proper sub driver will probably perform as well if not better and in a smaller box...
you mean ported 12" vs sealed 18" ?

or sealed 12" vs ported 18"?

or sealed vs sealed?

( I am particulary interested about sealed 18" with a similar driver)
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Old 26th September 2010, 04:23 PM   #10
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you mean ported 12" vs sealed 18" ?

or sealed 12" vs ported 18"?

or sealed vs sealed?
I'd imagine both. And are we talking volume or sound quality? A 12" with high excursion can move more air then this 18 in terms of surface area/xmax. There's so many variables involved (including amplifier specs) that size isn't the only major factor.

Sealed subs always sound best to me but lack sound volume. A large speaker could help with that. I could always cut the port last and give my opinion on it's sealed performance but a 6 cubic foot sealed box might not be ideal for this speaker. I don't have the test equipment required to plot the frequency response either.

Last edited by lazzer408; 26th September 2010 at 04:27 PM.
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