Speaker crossover?!?!
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
Since you also upgraded your rear 6½" twiddlers (I'm guessing you got the GX628 JBL coaxials to go along with your front GX328), I'll recommend you run your 4 main channels full range in your new headunit and either:
- highpass your front 3½" coaxials with the 600Hz filters from Crutchfield
- and run your rear 6½" coaxials full range
- highpass your front 3½" coaxials with the 600Hz filters
- and highpass your rear 6½" coaxials with the 300Hz filters
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
Precisely because the new headunit has built-in complete bass management capabilities is why I was recommending to run the 4 main channels full range (no HPF to any channel, and disabling subwoofer output(s), if applicable).
The reason for that is that the Axxess and PAC adapters tap the aftermarket headunit's 4 main channels speaker outputs to generate the line level signals that are passed to the Bose DSP module via connector C4. The 4 main channels need to run at full bandwidth, otherwise the DSP module would not be able to pass all the low frequencies to the subwoofers, and whatever info is filtered out by the headunit's HPF is lost.
The reason for that is that the Axxess and PAC adapters tap the aftermarket headunit's 4 main channels speaker outputs to generate the line level signals that are passed to the Bose DSP module via connector C4. The 4 main channels need to run at full bandwidth, otherwise the DSP module would not be able to pass all the low frequencies to the subwoofers, and whatever info is filtered out by the headunit's HPF is lost.
Last edited by GCG; Sep 8, 2020 at 12:47 PM.
