sound level problem

[moochinazz]

Hey, i have a question for you guys. after trying out a diy firstwatt F5 (made for home audio) in my car i was disappointed very much. the sound level at ful gain was so low that i could hardly hear it. where do i search for problem? little more info on my car audio setup: the head unit is pioneer p88rs, mid range speakers -rs audio spl (91db), tweeters (some old scan speaks). there are no problems when i run the speakers off my car amps (audiosystem)

[ppia600]

The head unit may not have enough preamp voltage to drive the amp, home amps usually need substantially more. Maybe you can modify the input circuit of the amp to compensate.

[moochinazz]

i think it about incompatibility of my h/u output and amp input impedances. if there's some guy who could tel what changes i have to make in this scheme http://www.tcaas.btinternet.co.uk/hiraga3fig1.gif in order to have no problem with sound level i would be very grateful

[Perry Babin]

You should post this in the Pass Labs forum if it's a Pass design.

[moochinazz]

its a hiraga 20w version

[Perry Babin]

It was discussed on the solid state forum. Try asking this question there.
Solid State - diyAudio

[moochinazz]

thanx perry