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Old 28th December 2005, 03:17 AM   #1
gompka is offline gompka  United States
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Join Date: Jun 2005
Location: .
Default car audio sub in an HT setup

I was wondering about using my eclipse 88120dvc 12" sub in an HT setup i heard they are nice ported.

here are the specs on the sub.

size: 12"
DC-R: 3.1 ohms/coil
Fs: 27 hz
Qts: 0.30
Vas: 3.20 ft^2
SPL/W/M: 89.4 dB
Qes: .322
Qms: 5.0
Sd: 0.0511 m^2

modeling it in winlsd i got 2.5 ft^3 with a singe 4" x 15" port tuned to 27 hz.

Someone help me out here am i right with my design here? Also this sub has dual 4 ohm voicecoils and is 500 watts rms i'm thinking i may have trouble finding an amp for it i'd prefer it to be a plate amp if possible.
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Old 29th December 2005, 03:14 AM   #2
diyAudio Member
Join Date: Apr 2005
Location: Salt Lake
Well, since this has been hanging untouched for a whole day, I will throw my ignorance into the ring just to draw some rebuttals.

Since you want a sub for HT, the Fs on this driver looks a bit high. It is possible to tune below Fs to get around a less-than-perfect match between a driver you have on hand and the desired application, but the results will not be optimal.

On the other hand, if you don't think you will miss the cool LFE information in the lowest octaves that has become quite the rage to find and share, or if your mains require the "small" setting on your receiver, you may be very happy with this design. As far as power for this driver, it is possible to wire the coils in series for a nominal 8ohm impedance. Assuming the 500W rating is RMS running both coils, you could look for a plate amp that will supply 500-800W into that load. Alternately, you could make the box dimensions such that two plate amps could be mounted on it and give each coil its own amp. And since you have to run wires to the sub anyway, you might consider an outboard amp from one of the pro audio lines which could be placed with the rest of the audio equipment. These can be relatively inexpensive and often have more options for connections and loads.

This is just some food for thought and hopefully it will draw in some more diverse and experienced opinions.
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Old 29th December 2005, 10:28 PM   #3
gompka is offline gompka  United States
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Join Date: Jun 2005
Location: .
ok thanks for the info i never really though of a rack map. Can anyone throw out some brands of decently prices rack amps that will do 500+ watts @ 2 or 8 ohms?
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Old 30th December 2005, 12:57 AM   #4
gompka is offline gompka  United States
diyAudio Member
Join Date: Jun 2005
Location: .
actually i think i might have found something. It does about 600 watts into 8 ohms which will work. Is QSC RMX850 POWER AMPLIFIER good for $300? Its a partsexpress item.

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Old 30th December 2005, 03:07 AM   #5
eswets is offline eswets  United States
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Join Date: Dec 2005
Location: Chicago
I've got that same speaker (I think)and was wondering the same thing. Is 88126 the same speaker? I have two of these speakers and want to use them for my dj subs. I don't have my HT yet so I use all my dj equiptment for music. I'm looking for some powerful bass for my setup. Clean not just boomy.
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