McIntosh MC2600

Commentary

This is a stereo power amplifier announced as a top-end model that achieves both maximum output and minimum distortion rate among the Macintosh power amplifier group.

A large output of 600W + 600W in stereo and 1200W in mono operation with bridge connection is achieved. This continuous output does not change from 2 Ω ~ 8 Ω (1 Ω ~ 16 Ω in mono operation) because an output transformer is used.
It is also a powerful speaker drive with a power margin capable of supplying dynamic power of 2,200W + 2,200W (4,400W in mono operation) even under heavy loads 80% lower than the rated impedance and an output current capacity of up to 200A.

A total of 36 power devices in 9 parallel units are used in the output stage. The power stage operates stably by the output lance, and heat generation is reduced by a large heat sink and automatic tracking and bias circuit. In addition, a low-noise heat radiation fan of 2 speed operates when high-power operation is continued for a long time, and low-temperature operation is achieved.
In addition, an automatic recovery type power breaker is built in in case of overheating.

In order to cope with excessive input exceeding the clipping output, it is equipped with a Power Guard System unique to Macintosh, and the gain is automatically reduced when excessive input is made.
In addition, the Sentry Monitor system controls the output current against excessive current such as output short.

The circuit is equipped with a new Macintosh circuit that does not generate crossover distortion, a balanced amplifier, strict impedance distribution for each stage, and careful examination of constituent parts. This realizes a low distortion factor even in the minute output region despite being a large output amplifier.

A high-current capacity gold-plated terminal is used for the output terminal.

Model Rating

Type	Stereo power amplifier
Output (sine wave continuous output)	Stereo : 600W + 600W (2 Ω, 4 Ω, 8 Ω) Mono : 1,200W (1 ohm, 2 ohm, 4 ohm, 8 ohm, 16 ohm)
Output impedance	Stereo : 2 Ω, 4 Ω, 8 Ω Mono Parallel : 1 Ω, 2 Ω, 4 Ω Mono bridge : 4 Ω, 8 Ω, 16 Ω
Output frequency band	20 Hz to 20 kHz
Total harmonic distortion factor (20 Hz to 20 kHz)	Stereo : 0.005% or less (250 mW ~ 600W, both channel operation) Mono : 0.005% or less (250 mW to 1200W)
Intermodulation distortion factor (20 Hz to 20 kHz)	Stereo : 0.005% or less (peak 1,200W or less per one channel, both channels operating) Mono : 0.005% or less (peak, 2,400W or less)
Frequency Band (at 1W output)	20 Hz ~ 20 kHz + 0 -0.26 dB 10 Hz ~ 100 kHz + 0 -3dB
Signal-to-noise ratio	105 dB or less (at rated output, A-weighted)
IHF Dynamic Headroom	1.7dB
Damping factor	40 or more
Input impedance	20k Ω (unbalanced) 40k Ω (balanced)
Input sensitivity	Switching to 1.4 v, 2.5 v
Power Guard	Overdrive at 1 kHz up to 14 dB THD within 2%
Accessory function	Power meter for lighting with voltage regulator WATTS/HOLD meter display changeover switch Left and right independent gain volume Headphone monitor terminal Speaker on/off switch
Pwer	100 VAC, 50Hz/60Hz, 2A ~ 24.5A, 15A, UL/CSA
External dimensions	Width 483x Height 267x Depth 457 mm (including terminal) Handle Clearance 44 mm
Weight	59kg