HotHouse / Hot House M500 pair of mono block mastering amplifiers

Incredible sounding Hothouse M500 mono blocks. There are some scratches and wear on these as seen in the pictures, nothing out of the ordinary for their age ( 1990's) . Fantastic sounding and working amps that have no rivals at this price point. I have too many amps so these must go to good home. These amps have 1/4" unbalanced ins (most mastering houses run unbalanced from their custom consoles) so be awarre of this. Not a problem unless you have Ground loops in your AC power. Incredibly quiet amps. Robust and simple/elegant design. Shipping will be more than what I'm charging in auction.... these babys are heavy. These are available locally so i reserve the right to end the auction at any time.

M500

Mono High Current MOSFET
Control Room Amplifier

As an alternative to its stereo sibling, the M500 monoblock has been designed to offer the ultimate in smooth extended bandwidth for the most advanced audiophile monitoring possible. Utilizing the same twelve 100 watt MOSFET output devices and high current power supply, a different approach to the front end design has yielded a slightly warmer, less aggressive presentation with an enhanced and truly astounding deep bass response. Also, in our attempt to emulate the "tube" sound, a significantly higher output impedance has been used to provide a damping factor that does not vary with frequency. In traditional designs the lower damping factor exhibited at the frequency extremes is remedied in a tube amplifier's circuit by the necessity of using an output transformer... with its unfortunate contribution of sonic impurities. In theM500 we have applied the benefits of this concept without the drawbacks, providing very strict cone motion control at all frequencies. Since the M500 is not a bridged version of the S400, but a dedicated parallel mono unit, it does not supply quite the output of an S400 bridged, but is, however, quite happy at all impedances down to one Ohm. In stereo pairs the M500 will bring out the best from the finest monitors, while single units are the perfect choice when mono subwoofers are added in the nearfield environment.