I have an Alpine head unit CDA9886M with 6 pre outs, using the one marked SW into a Polk PA D4000.4 bridged into 2 Polk MM1040 subs they are not very loud, I checked the polarity on the subs and tried every setting but, you can stand right next to them and talk to the person next to you...... any thoughts? at 400 watts to each bridged they sound way under powered.
Settings: Stereo, switch on BPF, LPF switch out, LPF knob about 100hz, level between 3v and 200mv. Head unit: sub level and bass level at max. I cant say there is even a solid thud, more of a rumble. I have a 400 watt audiobahn with a single 12 that sounds 10 times as loud and more solid hooked to a factory radio.
I just hooked up an AudioBahn A4002T rated at 100 watts per channel, it's only a 2 channel amp. It sounds
WAAAAAAAY louder and clearer. While I'm not arrogant enough to think I'm beyond making a mistake, I've been a Honda technician for 21 years, my specialty is electrical. I've tried 2 of these PAD4000.4 amps with the same result.... pulling out what little hair I have left.