I have 5 THX Certified Marantz MA-500 Mono channel amplifiers for sale. All are in great shape, work great, and sound fantastic! Set up your music speakers, your movie surround sound system, plenty of power for pretty much any speakers!MA-500 Specifications:The Marantz MA-500 THX Ultra certified Monoblock Power Amplifier measures just 33/4" in width, yet delivers 125 watts into 8 ohms. In common with the MA-700, the MA-500 is ideal for creating multi-channel home theater and multi-room systems or for adding additional channels of amplification to an existing system.- High Current Power Supply offers true low impedance drive capability--125 watts into 8 ohms and 180 watts into 4 ohms.- Two MA-500's can be Bridged together to produce over 360 watts into 8 ohms.- Compact Design--5 MA-500's occupy the width of a single conventional stereo power amplifier.Amplifier Section:Continuous power output (RMS)8 Ohm 20 Hz - 20 kHz