Adding onto Bose factory system

I recently purchased a 1998 Oldsmobile Intrigue.  It came with a factory Bose system including a cd player, 5-1/4"s and tweeters, 6x9s and tweeters, and a factory amplifier.  I already switched out the cd player and I am planning on adding my MTX 81000D and 2 Kicker XPL 15"s.

The problem is that I only have to turn up the volme to about 8 or 10 before it is almost too loud for the speakers.  I don't want to have to turn up the gain too much on my amplifier, yet I don't want to blow the Bose speakers because they sound awesome...any suggestions?

I hooked it up as if it were a regular system.  I know that a lot of people tell you not to do so with Bose because of the impedance; however, all of the speakers are on an amplifier and the cd player is pretty outdated anyway so I am not worried about it.

I was wondering if there was a way to change the gain on the Bose amplifier.

Nope there are no controls for/on the bose amplifier, so the only way to control the volume really is to adjust the level of the bose input.

So are the bose amps still being used?  or is your aftermarket head unit powering all of the bose speakers?

The proper way to have everything hooked up, so that the bose amplifier does not get too high of an input signal, as well as to send power to your sub amp in the future, you'll use the aftermarket head unit's preamp output(s) to send a signal to the sub amp.

In order to keep using the bose speakers and have it all work right, you need to get an integration adapter, as this will let you adjust the level of the signal that gets input into the bose amp, so that it matches up properly.

I had already planned on using the preouts on the cd player for the sub amp, I just wish their was an easier way to control the Bose amp.

I am not sure if all eight speakers are connected to the Bose amp or which ones aren't but I will check soon.

It would probably be best to use all aftermarket speakers instead.

I will use RCAs for the sub amp but I wish there was a way to control the Bose gain.

I am not sure which speakers are connected to the Bose amp but I will check.  It is probably best to use all aftermarket speakers anyway.