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38 Posts
I am having a problem similar to SteamFire with my audio setup... it's driving me nuts!
At all volumes I can hear a distinct hissing (white or pink noise - basically no structure to it - not alternator whine). Regardless of HU volume it's always at the same level. Increasing/decreassing AMP gains increase/decreases it. The Hissing stop completely when changing radio stations or CD tracks (no audio for HU).
At high volumes the audio starts crackling, just like a blown speaker. The sound volume (SPL) at which it happens is different, it depends upon AMP gain only, not HU volume setting. The higher the Amp gain th lover the HU volume needed to trigger it and vise versa.
Ok, for the set-up, I have to original Head Unit but replaced the crappy speakers and added some Amps. The amps are an Alpine F450 for the Pioneer 12" bass and a couple Alpine F250 for the other various kappa speakers (I've tried some Sonys amps with the same result).
other noteworthy tidbits, the HU and Amps are not on the same circuit and I've tried some impedance matching between HU and amps, without success.
Help please
At all volumes I can hear a distinct hissing (white or pink noise - basically no structure to it - not alternator whine). Regardless of HU volume it's always at the same level. Increasing/decreassing AMP gains increase/decreases it. The Hissing stop completely when changing radio stations or CD tracks (no audio for HU).
At high volumes the audio starts crackling, just like a blown speaker. The sound volume (SPL) at which it happens is different, it depends upon AMP gain only, not HU volume setting. The higher the Amp gain th lover the HU volume needed to trigger it and vise versa.
Ok, for the set-up, I have to original Head Unit but replaced the crappy speakers and added some Amps. The amps are an Alpine F450 for the Pioneer 12" bass and a couple Alpine F250 for the other various kappa speakers (I've tried some Sonys amps with the same result).
other noteworthy tidbits, the HU and Amps are not on the same circuit and I've tried some impedance matching between HU and amps, without success.
Help please