HU pre-out & amp gains!

So i have a head-unit that puts out around.5-.6 volts and im using a y splitter from the mono out-put. The thing is my amp gains have to be set to 75-80% to achieve the disired level of bass. Along with the gains cranked up i also have the bass boost at like 6db..
As for what im running its a hifonics glx 1400.1d pair with two 15inch kicker cvrs @ 1ohm.
Anysugguestions? I dont want to damage the amplifier having it cranked up the high but the thing is it really doesnt get that hot.
Dont use the gain as a volume knob....i know but seems to me at this point it has to be done.

As long as you can hit the power level you want, you're good. It doesn't make the amp "work harder" to have the gain up high.

does the headunit have a sub level control? and are you saying the HU puts out .5 - .6 or 5-6 those dots make a HUGE difference. what headunit do u have?

It's output volt is around .5, I called the manufacture and that's what they told me. It's a mono output with no sub control.

What HU would that be?

If you pat attention to the Hifonics amp the gain is actually marked in HU output and all the way up is .2V so if your at .5-.6 it will be way up.

Get a new HU if you want to fix the "issue".

Everyone talks about gains and not using it as a volume knob, well by me having it at 80% to meet my .5 volt output isnt that kinda using it as a volume knoB? I mean the amp doesnt really get that hot butt it does pop 120amp fuses under the good if i pound for to long. I am just trying to perserve the life of my amplifier thats all. But Once i hit the lottery steve here i come!

Seriously man, get a deck with a dedicated sub out and at least 2v out.

No, you're using it how you're supposed to. To match the input voltage to the ouput.