How to bridge a ppi amp - PPI PCX-1500 Car Audio Amplifier

That would depend on the impedance (resistance) of the subs. Your best bet would be to use the full power of the amp to one channel (i.e. bridged) instead of to two separate channels (i.e. stereo). Two 4 ohm subs wired in parallel would present a 2 ohm load to the amp, which should allow you to get all 1600w out of it.

This explains series vs parallel quite well:
http://www.termpro.com/articles/spkrz.html

Are you sure everything is correctly connected. If you are running the amplifier in bridge mode then take note that the load to the amplifier can be no lower than 4OHM. dreamsystems

If you look at the speaker hookup it will say bridged and have a line going to the two that you should use....If it doesnt then it might be an amp that you cant bridge

sorry to tale you, but my opinion SONY just SUCKS... as you can tell. Might wanna upgrade your amp. I have had no luck with sony. Try audiobahn, mmat, ppi, mcintosh, zappco, orion, rockford. THESE are a lot better amp to go with by far. But thier is a lot better brands out thier that just knocks sony in the dirt. my favorite happens to be the audiobahn A2300HCX aka cheater amp. NICE AMPS. it also depends on what kind of subs you got to

the sticker usually shows u the exact way the leads r set so just use the sticker

Use some good 4 gauge wire to the amp and ground - and getcha some like 12 gauge speaker wire(MONSTERCABLE) I recommend using streetwires brand but any reputable shop around your town should have some good solid 4 gauge. Might want to invest in at least a 1 farad capacitor too if your lights start dimming when the bass hits you'll know its time for that cap-they're alot cheaper than a new alternator-good luck

Here is an archive od PPI PowerClass manuals...

http://narbi.free.fr/manuels/Amplis/Precision%20Power/Serie%20Powerclass/

the bridge rectifier is most likley shorted in the amp.you could repair yourself if you can solder but amps are cheap today and you might just look into replacing it.please rate my solution.

If the woofer isn't moving significantly, try the following settings:

gain at highest (most sensitive) setting

crossover at highest frequency

subsonic filter at the lowest frequency

If those do nothing and you have a dual voice coil woofer, you may have one coil reversed. If you disconnect one voice coil and the woofer moves significantly more, check the polarity of all speaker wire connections.

Here's a brochure for the amp:

http://cartoys.com/cartoy/pdfs/eclipse_amp_manual.pdf

 

You're correct. this amp cannot be bridged to produce more power. It's minimum safe load is 4 ohms per channel. It's essentially two bridged amps in one chassis.

I'm not familiar with this amplifier but in most cases, if a mono amp has more than one positive speaker terminal and more than one negative speaker terminal, the positives are directly connected and the negatives are directly connected. So  as long as you connect the speaker positive to a positive speaker terminal of the amp and the speaker negative to a negative speaker terminal of the amp, it will work properly.