What size amp?

Probably as close as you'll get to 'right' with what you have on hand. I'd also consider bandwidth limiting the rears - keeping most high frequencies out...maybe piddle with the crossover point from 250Hz or so and playing with delay for the desired result. Seems like most start out around 20 ms

 

The bass knob for the TWK88 has a push button function that enables you to toggle any setups you have saved in the module. I only keep two or three presets, but you can have at least 5 or 6 if you want. There's an LED that comes with the system that changes color to coordinate with each saved preset so you can keep track of which tune is active. It enables you to switch on the fly between different tunes, time alignments, mapping... anything you can adjust with the software. So he could add the amp, have one preset for all speakers, one preset for just front stage +sub, one preset time aligned to the driver seat, one time aligned to the center of the truck, one with no EQ, different crossover settings, different output levels different different different, and have the ability to hit the button and cycle through them all.

If you really wanted to, you could use the Valet function to trigger a neutral tune using a pressure switch in the passenger seat, so when someone sits in the seat, that tune becomes active automatically.

It would be a simple matter to set up a neutral tune for when he has passengers. I mostly use it to A/B compare but I do have a preset for concurrent separate front seat and back seat time alignment to the subwoofer... because I can.

 

I have 3 tunes set up with my audiocontrol dsp that I can switch between.
Driver time delay
Everyone (no time delay)
Blank setting (crossovers set, but no time delay and eq set.)

Though I never really change it because I like my music to sound how I want it to.

 

Yeah those are the three minimum to keep I think. It's also useful for doing A/B on different EQ settings so you can kind of learn the consequences of different adjustments. Not everything that looks good on an RTA will sound good to your ear.

 

Thats very true, I set up the input signal to be flat going into the dsp, it sounded like absolute garbage. When I changed it back to what the factory entune was giving me, it sounded 100% better.

 

Thank you all!! Yes im doing some upgrading..My 4 channel is going bad so im just upgrading the amps..The mono amp is fine but ill replace it to so my amps match..I was just seeing what you all thought about rear fill...I might go with the extra amp and do like you said with different presets for passengers and when im just in my truck ill have a setting for that..I still like the front stage sound..lol