What is a pre-out on a headunit?
Pre-out stands for preamplification output. They are commonly used with a subwoofer and provide aid in adding all kinds of channels to your home theatre. By using preamp output, you can consider serious upgrade options. It is a way to take your signal out from your amp before it passes through the power section.
What are 4 volt pre-out head unit?
4 volt pre-outs have higher resolution than lower voltage pre-outs. this translates to a cleaner, more detailed signal at the amplifier input stage for a cleaner audio reproduction.
What should RCA voltage be?
A good quality RCA audio source should have a voltage rating around 1-2 Volts and a low impedance. The voltage is the “strength” of the signal and the “impedance” relates to signal integrity once the RCA is plugged into the amplifier.