Can you bridge a 4 channel head unit?
Yes it is possible to do, but it can and the eventually will fry your head unit if it is can’t handle it. Plus the gain in a head unit will be very minimal. Most head units run 4 channels at 20watts peak, about 10-12rms. Bridging will give you possibly 35watts out of the two channels and about 15watts rms.
Does pre amp voltage matter?
If you are planning to add an amplifier to your mobile electronics system, make sure your source unit can produce at least 4 volts of output on the preamps. This extra voltage will allow your installer to reduce both the sensitivity controls on your amplifier and the background noise level of the system.
What are pre amp outputs used for?
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.