doug97gxe

only reason to use the rear is if you want to use the fader on the radio .. and for a good setup you shouldn't use the rear as additional full range speakers for your ear passenger .. they should be rear fill or not even used at all

MDXLT

I only use the rears for fill anyway. It's just what I'm used to. But, I'm also interested in not using to many hook ups to achieve that so, I will unplug input channels 3 and 4 from the DSP, leave output channels 3 and 4 connected therefore only using the front l/r speakers for the signal.

Kanadian-kaos

Why would you do this? You lose the ability to fade front to rear off the HU. When no one is in the rear, I just fade it to the front. Unless you have a bunch of preset DSP settings saved.

You can defeat the EQ in Forscan.

dgoingsjr

Rookie mistake !!! I was in such a rush to get everything done over the weekend . I fat fingered the input button on the amp and set it to “high” . Now , all channels are playing. Thank guys for the input . The only issue left is , one amps shuts off during auto start/stop . I’m going to try out what Planetix suggested.

MDXLT

If what I do here does anything I don't want it to do, I will return it to what I have now. It's only a matter of two RCA inputs. We must experiment.

MDXLT

Ok, disconnected channels 3 and 4 on the input side of the DSP, made some source input corrections in the 408 program and now both front and rear speakers get their signal from one source, the front right and left. While it does render the fade in the HU useless to some extent, this function is merely transferred to the 408 program in the amount of decibels you determine for each channel. I will have to listen to the effect doing this has caused to see if it is worth keeping. At any rate, it hasn't pulled a negative in my book for my initial response and as I said earlier, it is easily put back to 'normal' if need be. Time will tell.

nineball

no need for rear with a properly tuned system with a dsp. what you said would be the opposite - you should only use the fader IF you have multiple dsp settings for each scenario, i.e. one for no rear and one for rear.

planetix

I would not use the factory fader if you are running separate amps/DSP. Even if you get it to work it's only going to cause problems. If you've got your DSP dialed in right you shouldn't miss factory fade (or balance for that matter) anyway.

If we're talking about the stock system you don't need to use Forscan to defeat the EQ (because there isn't one). That trick is particular to the "Premium" Sony system that was available up to 2017 if I am not mistaken. The new B&O Play requires an entirely different approach (see my build thread).

dhmcfadin

Because with a DSP, fade is now controlled through the dsp. Why use any of the eq settings on the headunit when you have exponentially more control with the Dayton.

dhmcfadin

Yes sir! Right again!