[SWRocket]

Originally Posted by SomeGeoffGuy

I am not worried about how loud it is. It sounds terrible at half volume now with all the buzzing from the doors. So if I lose 50% volume, it's fine. This car is louder at half than my 2016 was at full, too, so I am not worried about it being too quiet. Going to do some dampning work on the doors in the spring, and I can't bear to put them back together with Bose Speakers.

On top of what you said relative to DSP, my car is a convertible, so there are also two modes of the Bose EQ - top up and top down. There are a couple solutions that pull the signal pre-bose, and at some point, that is where I will head.

The thing is, every time I try to do an all-in-one project, it just takes forever. So step one speakers. Step two add a sub, step three get an amp wired post Bose, step four get the DSP and get a pre-amp signal. If I try to do all that at once, it might be years. Going to try to do one a year. Maybe two if I can keep my wife from giving me home improvement projects!

-Geoff

My 2c on this...you would be better off doing things the other way. For a Bose system you need the Axxess AXDSPX-ETH1 integration device.
I would install that along with the GS25 and GS690 and use a Helix M6DSP. No sub yet)
Bridge 2 channels of the M6 to each of the 690s and you will have great sound (after tuning) Later you can add a Helix M1-X and a sub.
The 690s were designed to work well and give decent bass even without a sub. Set a 50Hz LR4 HP and a 300Hz LR4 LP on the 690s and a 300Hz LR4 HP on the GS25s. use the Helix ATM function or measuring tape to set time alignment. Audiofrog sells a great microphone that you can then use to measure and eq you system, either with the Helix TuneEQ or REW