McIntosh MC-275 Mk IV versus MC-250

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rcarlton

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McIntosh MC-275 Mk IV versus MC-250
« on: 15 Jul 2007, 12:49 am »
One month ago I purchased a McIntosh MC-275 Mk IV to replace my MC-250 for two-channel and home theater listening. Terry DeWick restored my MC-250 to specs last year.

Back in 1970 the MC-275, 75 watts/channel, sold for $444 and the MC-250, 50 watts/channel, was $379 (the MC-2505 sold for $449, the blue meter version of the MC-250). Based on the similar prices one would assume they would sound about the same.

Listening test:

I used Chesky’s Ultimate Demonstration Disc to test the amps. The Chesky disc is well recorded and easily available, and I have listened to the disc many times and know it well. I have listened to many CD's with the amplifier in the past month. The system consisted of Klipschorn’s, Cambridge Audio Azur 640C, Denon AVR-3200, and Monster cable.



High resolution: Spanish Harlem, Rebecca Pigeon’s voice was very distinct and filled the room, the MC-275 seem to put a ‘halo’ around her voice. Heard more of a sharper distinction in the vocals with the MC-250. Edge MC-250.

Depth: If I Could Sing the Blues. Virtually identical. Placement of the trumpet is identical, about 15 feet behind and to the right of the microphone. Tie.

Midrange purity: Grandma’s Hands. Near the end of the song you can hear tapping of feet, seemed more distinct with the MC-275. With the MC-250 sounded like they were wearing tennis shoes, with the MC-275 they might have been wearing dress shoes. Edge MC-275.

Holographic Imaging: Festival Te Deum. You can certainly tell this piece was recorded in a large cathedral. No edge to either amp. Tie.

Bass Resonance. Maybe more detail in the MC-275, especially as the fingers moved down the strings. Slight edge MC-275.


Appearance: Edge MC-275. Who can resist the glow of tubes?

Measurements:

Measured the room response curve of both amplifiers using full range test tone from Room EQ Wizard. The MC-275 seems a little flatter in the higher ranges and does a better job at 12-17 KHz. Lower end the curves track real close. Edge MC-275.





Overall: Slight edge to the MC-275.


Conclusions:
The newer MC-275 Mk IV beat the MC-250 by a small margin in my very subjective tests. Is the difference in price between the MC-275 at $3,900 and MC-250 at $450 (after a going over by Terry DeWick) worth it? The MC-250 is one heck of a value. Very warm, tube like sound at 1/8th the price!

« Last Edit: 15 Jul 2007, 08:55 pm by rcarlton »