Sorry if this post gets long winded....

I purchased an Alpine 9827 headunit today and had it installed at a local stereo shop. They used a PIE HRC-GM21 (basically the same as PAC-OEM1) but I think they have the line adjustments too high because I have some small but noticeable noise in speakers now. First chance I get I was gonna pull it out and try to adjust the 4 individual gains down some on the PIE adapter but while messing with the adjustments of the radio and trying to learn some of the features I think I have found another issue that needs to be taken care of first.

Here is the issue and what I ultimately need an answer on.
With the factory Bose CD player when I adjusted the fader control towards the front it would cut out the far rear fill 4" piece of crap speaker but didn't affect the rear sail panel subs. Now when I use the fader to fade towards the front it cuts the far rear fill speaker and the subs. Did they make a mistake here or is this the way it should have been done? I know the gains are too high but that is a simple thing to pull back out and readjust, but I am hoping he wired it wrong and I can take it back to be wired correctly. I usually ran my fader close to all the way faded to the front for a better sound stage and because the wimpy hatch speaker just made the whole thing sound like crap anyway. Please tell me he made a mistake wiring them (sail panel subs & hatch speaker) together and that he can rewire this to the way it was before where they were independant of each other.

Thanks in advance for any info on this (details on how to wire it correctly would be perfect if anyone knows)

I know someone is gonna say that the best thing is to do is to rip out all the Bose equipment and replace it but I have a family and have to do this in pieces over time when the $$$ is available so this is all I can add at the moment.

Thanks,
95z noob

 

I am no audio expert, but I have been reading and asking a lot about audio in the last month. I too am planning on using an adapter + an aftermarket HU.

My guess is that the PAC & PIE units' 4 gain controls are similar to a 4 channel amp and that the one rear hatch speaker (actually 2 in there) and a sail-panel sub must be controlled by a single gain screw. So 2 gains control each of the doors and 2 gains control each set of sub + rear speaker. Unless our subs are not individually amped like the rest of the system, I don't see a way around this while using the adapter.

I guess you could lower the gain for the rear a bit to keep the fronts louder, but that would soften the subs.

Please let me know how it goes. I'm looking to do the same

 

I actually got it sounding good again. Since the Fader and Balance do strange things with my set up. I found that by turning the screws on the PIE unit down some and adjusting the Fader and balance I could bring the sound stage back up front and keep the bass hitting good. Its a pain in the *** but once you get it the way you want it....write down all your settings in case the need arises to unhook your battery.

Ed