Just fitted the Alpine SPC D84AT6 Subwoofer and DSP amp to complement the SPC 108s fitted last year. Lessons from the installation:
DSP definitely improves the sound compared to OEM headunit, but subwoofer not as convincing out the box. I will give it more time.
UPDATE: DSP Pwr supply pin not seated correctly by me and after some playing around i got it on properly. Subwoofer improvement happy.
The package was neither compatible with the passenger seat (T6) as stated in the instructions and more importantly, not compatible with the captains chair mount.
I had to angle grind some ironwork from the passenger seat. The Captains Chair plate has been removed for now until i can think of a modification.
UPDATE: Got the angle grinder out again on the Captain's chair to slim down the strengthening braces and give clearance between the Captains Chair and the subwoofer. Obviously not an issue if you haven't got a swivel Captains Chair but I suspect quite a few Dubbers have.
Instructions not that clear. There is a terminated blue wire at the headunit that is not mentioned for either the T6 or T6.1 config. CEN did tell me it was not needed.
In order to fit the loom at the headunit side you need to free the OEM beige speaker socket from its cable cloth wrap and fold it back otherwise the headunit will not fit back when Alpine black socket connected.
Likewise on the DSP side i had to do a partial rewrap of the Alpine loom in order to seat the black and white connectors and release the tension on the pins. Alpine need to make the looms up connected to an amp to avoid one connector cable length being shorter than the other.
Make sure there is some slack in the loom at the Headunit end to allow its removal at a future date. Plenty of length in the loom and power line to accommodate all needs.
if you have electronics in the passenger seat (I didn't) it will be a very tight fit to accommodate that and the DSP/Subwoofer.
set up of the DSP is a simple case of dialling a number on the amp consistent with you Van model. As audio is a personal taste I think i would have preferred more freedom to dial in the DSP. Might dial in the other Van settings and see if there is any sound improvement.
Overall like the DSP and after rejigging the connection, the Subwoofer too but this fit is not plug and play