Comps are quieter now after HU upgrade

[ace_800 5,000+ posts]

I was never able to replace my factory HU, so I had to add one beneth it. Before I was using the PAC units to get the signal to the amps. The Pros I am running would get really loud with the amp gains set correctly.

When I added the Pioneer HU the loudness went considerably down, enough to where I have to adjust the gain close to 3/4 high and its still not close. I have adjusted the pioneer eq and everything I can think of. My rear door speakers went out and I even bridged the PG to pushing close to 200rms and I still have the gains at 1/2 and still not close.

Anyone know why?

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[Etac 10+ year member]

are you using a dmm to set gains?

 

[Bommy 10+ year member]

Might be because the new HU outputs at a lower voltage. Try using a line driver to get your channel output to around 5-8v. 8v is the highest the PG amp can handle I believe.

 

[Etac 10+ year member]

you dont even need 5

4 is good and you can probaly get away with 2... honestly.. and his amp prolly goes down to like 750 mv...