A Pre-Amplifier takes a low level input signal and prepares it for amplification. It allows for Volume control and device (source) switching, and often some form of equalization. These are multichannel preamps, also known as Home Theater Processors.
NAD AM-100 Upgrade Board
NAD VM-100 Upgrade Board
NAD AM-200 Upgrade Board
NAD VM-200 Upgrade Board
NAD T175 Home Theater Pre Amplifier (7.1 Channel)
NAD T175 HD Home Theater Pre Amplifier (7.1 Channel)
NAD M15 Surround Sound Preamp / Processor