This McIntosh MC-501 500w mono block has been used
exclusively to drive the center speaker in my home theater system. Using Audiogon’s definitions it is in very
good condition having only a tiny scratch on the right side bezel. I have the original factory shipping packaging
as well as the owner’s manual.
To be clear, this is a single MC-501 for sale, not a pair.
I’ve listed a few of the MC-501’s key features taken from
the Owner’s manual below; curtsy of McIntosh Labs: (I have and can send a .pdf
of the owner’s manual if interested).
Ships to the 48 contiguous US states.
For more information see the Stereophile review:
The MC501 is a Power
Amplifier with a capability of 500 watts into 2, 4 or 8 ohm speakers with less
than 0.005% distortion.
The MC501 is fully
balanced from inputs to outputs. It consists of two matched power amplifiers
operating in push-pull with their outputs combined in a McIntosh Autoformer.
The double balanced configuration cancels virtually all distortion.
The McIntosh designed
and manufactured Output Autoformer provides an ideal match between the
amplifier output stage and speaker loads of 2, 4 and 8 ohms. The Autoformer
also provides perfect DC protection for your valuable Loudspeaker.
Patented Power Guard:
The patented McIntosh
Power Guard Circuit prevents the amplifier from being over driven into
clipping, with its harsh distorted sound that can also damage your valuable
Patented Sentry Monitor
with Thermal Protection:
McIntosh Sentry Monitor
power output stage protection circuits ensure the MC501 will have a long and
trouble free operating life. Built-in Thermal Protection Circuits guard against
Minimum sine wave
continuous average power output is:
500 watts into 2 ohm
500 watts into 4 ohm
500 watts into 8 ohm
Maximum Total Harmonic
Distortion at any power level from 250 milliwatts to rated power output is: 0.005%
for 2, 4 or 8 ohm load
+0, -0.25dB from 20Hz
+0, -3dB from 10Hz to
2.1 Volts Unbalanced
4.2 Volts Balanced
A-Weighted Signal to
97dB (124dB below rated
output) Unbalanced and Balanced
Distortion if instantaneous peak output does not exceed twice the rated output,
for any combination of frequencies from 20Hz to 20,000Hz is: 0.005% for 2, 4 or
8 ohm load
Overall Unit Dimensions (Shipping container 28w x 25d x 18h)
Front Panel: 17-1/2
inches (44.45cm) wide, 8-13/16 inches (22.38cm) high. Depth is 14-13/16 inches
(37.62cm) including the Front Panel and Knobs
91.5 pounds (41.6 kg)
net, 105.5 pounds (48 kg) in shipping carton