McIntosh MC601 Quad Balanced Monoblock Amplifier Set

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This listing is for a super clean set of MC601 monoblocks from McIntosh that came to us from the original and only owner.

These super powerful monoblock amps from McIntosh are capable of driving just about anything.

Heck you could probably charge your Tesla in under 5 minutes with these beasts :-)

We also have both of the original McIntosh high-quality shipping cartons for these to ship safely anywhere worldwide on a pallet via freight.

If you're on the eternal waiting list to get a new set of amps from McIntosh due to amazing demand (or you just bought another BMW M series car) this might be a great alternative.

SkyFi Cosmetic Notes:

• Minor wear to top covers.
• Minor wear to faceplate trim and handles.

McIntosh Performance Features Include:

• Power Output
The MC601 is a Power Amplifier with a capability of 600 watts into 2, 4 or 8 ohm speakers with less than 0.005% distortion. The Power Amplifier Circuitry uses Thermal Trak Output Transistors for lower distortion and cool operation.

• Quad Balanced Circuitry
The MC601 is fully balanced from input to output. It consists of two matched power amplifiers operating in push-pull with their outputs combined in a McIntosh Autoformer. The Quad Balanced configuration cancels virtually all distortion.

• Patented Autoformer
McIntosh designed and manufactured Output Autoformers provide an ideal match between the amplifier output stages and speaker loads of 2, 4 and 8 ohms. The Autoformers also provide perfect DC protection for your valuable loudspeakers.

Manual:

McIntosh MC601 Monoblock Amplifier - Owners Manual

Recommended Cables:

McIntosh Balanced Audio Cables (XLR)

McIntosh Audio Cables (RCA)

McIntosh Speaker Cables

McIntosh Power Control Cables 

Kimber Kable - Ascent 10 Gauge Power Cord - Better 

Kimber Kable - Palladian 10 Gauge Power Cord - Best

The SkyFi Testing Process for Solid State Amplifiers:

We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.

If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.

Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.

If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.

Specifications:
Power Output
Minimum sine wave continuous average power output is:
600 watts into 2 ohm load
600 watts into 4 ohm load
600 watts into 8 ohm load

Output Load Impedance
2, 4 or 8 ohms

Rated Power Band
20Hz to 20,000Hz

Total Harmonic Distortion
0.005% maximum harmonic distortion at any power level from 250 milliwatts to rated power, 20Hz to 20,000Hz

Dynamic Headroom
1.8dB

Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3.0dB from 10Hz to 100,000Hz

Input Sensitivity (for rated output)
4.8 Volts Balanced
2.4 Volts Unbalanced

Signal To Noise Ratio (A-Weighted)
96dB Balanced (124dB below rated output)
94dB Unbalanced (122dB below rated output)

Intermodulation Distortion
0.005% maximum, if the instantaneous peak power output does not exceed twice the rated power output for any combination of frequencies from 20Hz to 20,000Hz.

Wide Band Damping Factor
Greater than 40

Input Impedance
22,000 ohms Balanced 22,000 ohms Unbalanced

Voltage Gain
29dB, 8 Ohms 26dB, 4 Ohms 23dB, 2 Ohms

Power Guard
Less than 2% Total Harmonic Distortion with up to a 14dB overdrive signal

Power Control Input
5-15VDC, less than 1mA

Power Control Output 1 and 2
12VDC, 50mA maximum total
Output is delayed 0.2 seconds from turn On

Power Requirements
Field AC Voltage conversion of the MC601 is not possible.
The MC601 is factory configured for the following AC Voltage:
120V ~ 50/60Hz at 6.6 Amps
Standby: less than 0.5 watt

Dimensions:

Overall Dimensions
Width is 17-1/2 inches (44.45cm)
Height is 9-7/16 inches (23.97cm) including feet
Depth is 22 inches (55.88cm) including the Front Panel, Handles and Cables

Weight:

93 pounds (42.18 kg) net, 126 pounds (57.15 kg) in shipping carton