Re: 2 or 4 volt preamp on Head Unit
Realize that with 2 volts spec, you'll only have about 1/2 volt with the HU at 3/4 volume. While that works fine for most installs, it causes you to crank the amp gain up quite a bit and that can cause some hiss on quiet passages.
Also realize that the overall quality of 4 v HU's is typically better than the lower models with only 2V. I won't own another 2V HU.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
Sub Stage: Boston G3 10", 0.5 cu ft sealed
Amp: PPI Phantom 900.4
Rear Fill: Boston SE953 6X9's