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Old Jan 25, 2004
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changes gone right!

ok, today i decided to mount my subs inverted to keep crap in my trunk from hitting the cone and damaging it. And while i was at it i wired them up to 8 ohm each instead of 2 ohm.

They are 2 alpine type-r subs powered by 2 phoenix gold XS 2500's, and the box is 2 sealed .93 cu/ft boxes.

Anyway, i upgraded the wire from 20 guage to 12 guage wire and it hits a lot harder and a lot cleaner. And the headlights dont dim much anymore.
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Old Jan 25, 2004
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Your headlights don't dim anymore because your amps are now putting out half the power they were before.
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Old Jan 25, 2004
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Correct me if I am wrong...but I thought the lower the ohm rating the better??????
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Old Jan 25, 2004
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I understand that they are putting out less power. That is why i was soo impressed that it actually hit harder. With the little 20 guage wire, it wasnt seeing the full power the amp was trying to put out. And the box was a bit too small.

With a combination of the larger wire and increased unused volume inside the box, i believe it made a large difference. I could wire the coils back to 2 ohm, but there is no real need. 170 amps is a little much to be pulling from the stock alternator.
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Old Jan 25, 2004
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If they hit harder now, imagine if you wired them right. If they are inverted then fixing the wiring should be way easy to get to ....

Drnknmnky13: The ohm rating has nothing to do w/ how good something is. The key is to matching the subs resistance to make an amp work to its full potential. Generally speaking amps will put out more power as the ohms goes down, but generally distortion will go up. Also the amp needs to be able to handle that low of an ohm load. Look at amp specs, many amps when bridged are no longer stable at 2 ohm and have a higher distortion rating. You wouldn't be able to hear a difference w/ identical sub, one that is 4 ohm sub and one a 2 ohm sub, if both are given 200 true watts.
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Old Jan 25, 2004
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It's strange how that works, but the one sub I'm running now hits as hard as when I had two back there. It's all about the install and how you tune everything.
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Old Jan 25, 2004
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The amps are 2 ohm stable according to the manuals. "85 amp maximum power output in 2 ohm mono"

The subs are 300 rms and 1000 peak, and my amp is 500 rms @ 4 ohm. So i am sure i am closer to the RMS rating on the subs.
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Old Jan 25, 2004
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Originally posted by Regularjoe
If they hit harder now, imagine if you wired them right. If they are inverted then fixing the wiring should be way easy to get to ....

Drnknmnky13: The ohm rating has nothing to do w/ how good something is. The key is to matching the subs resistance to make an amp work to its full potential. Generally speaking amps will put out more power as the ohms goes down, but generally distortion will go up. Also the amp needs to be able to handle that low of an ohm load. Look at amp specs, many amps when bridged are no longer stable at 2 ohm and have a higher distortion rating. You wouldn't be able to hear a difference w/ identical sub, one that is 4 ohm sub and one a 2 ohm sub, if both are given 200 true watts.
technically speaking, you DO get a much higher damping rate and a lower THD at higher ohm loads, so one can get better sound at higher levels of resistance.
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Old Jan 25, 2004
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inverting the sub also increased your box space. no more magnet taking up space.
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Old Jan 25, 2004
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can u post some pics of ur system setup?
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Old Jan 25, 2004
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Originally posted by DoubleDeuce2k2
inverting the sub also increased your box space. no more magnet taking up space.
in reality though, .1 - .15 cubic feet wont do a damn thing to the sound of a sub unless youre a SERIOUS audiophile and teh sound is tested in a perfect environment (ie: not a car!)
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Old Jan 26, 2004
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my subs have a pretty serious magnet on them.Im sure they displace more than .1 cu/ft.
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Old Jan 26, 2004
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that idmax has a displacement of .12 cf and its a pretty big sub

even the jl 12w7, a monstrosity of a sub, has a displacement of .14 cubic feet. so your type r, definitely has right around .1
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Old Jan 26, 2004
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he's also changing the direction they fire 180 degrees. i was just thinking of reasons why they would seem louder with less power.
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