Would i be able to tell the difference between a head unit with 2.2v outputs and one with 4v outputs? Theyre preamp straight from the HU.

 

yes....more sq ....but at the same time will pick up dirt in your signal easier

 

with 4v you amps gains should be lower and thus should send a "cleaner" signal. but these days it seems everyone claims h/u dont put out the preamp voltage and such. but either way, 4volts is better.

 

Pay more attention to the resistance than the Voltage. Most manufacturers are now 4-6.5Volt. With 200+Ohm resistance. Eclipses lower line 2.8Volt is easily comparable with most other 4+volt.

Yes you will tell a difference.

--Don

 

definately. sadly, my old pioneer only puts out 2.2 get a HU with at least 4v preouts you WILL notice a difference

 

yea look for the lowest possible output impedance...the lower the impedance, the closer the unit's OP-AMP's are to ideal OP-AMP's (which is a good thing)

 

what's a good impedance range? my panasonic puts out 5V at 60 ohms

 

that's fine

 

many thanks you guys, you've pretty much made my decision on what to go with next