The McIntosh MC-2300 was my first basic Mac power amplifier. I bought it paired with a McIntosh C-29 preamp.
The MC-2300 is an imposing piece of gear, being 19” wide, about 10.5” tall and 18” deep it is a beast. It weighs in at 128lbs! You find a place to put it and that’s where it stays.
The 300 watts per channel rating is ridiculously modest, but it is noteworthy that MAC specs that rating all the way down to a .05 ohm load in stereo and .25 ohm load in mono! That’s nearly a direct short!
The McIntosh MC-2300 is well know for being used at Woodstock, powered the Grateful Dead’s wall of sound and was the personal guitar amp of Jerry Garcia. They were used in outrageous commercial applications where they absolutely ruled the market place powering stadiums and concerts halls around the world. I always felt that the MC-300 build in answer to Crowns famous DC-300, also widely used in sound reinforcement. The difference of course was the power. 150 watts per channel for the Crown and 300+ for the Mac.
Back in 1997 I was in upstate Michigan in an audio showroom. It was a rainy Saturday afternoon and the in house tech was bench testing amplifiers. Not client amps, just some used gear they had laying around. It was a slow day and it passed the time. I mentioned that I owned an MC-2300 and noticed that they had one on the floor. “Wanna see what it’s made of?” Remarked the tech. You bet! I gave him a hand and we carried the Beast over to the bench. Using dummy loads of course we found that the MC-2300 would deliver more than 570 wpc at 1K (the only frequency we were testing) at 8 ohms. 1150 wpc at 4 ohms, 2670 into 2 ohms at which point the line voltage dropped below 90volts, so no further testing could be done. That’s insane performance from an amplifier built in 1971, and way beyond its exceptionally low conservative power ratings.
Phase Linear is often credited for offering the first ‘high power’ amplifier with the original Phase 700 which was rated at 350 wpc into 8 ohm. Having owned many Phase Linear amps I can attest to their power, but I highly doubt it they would drive anything close to a .05 ohm load without imploding.
To me, the MC-2300 is McIntosh’s best sounding high powered amp. This amp doesn’t have the famous McIntosh ‘Autoformer’, transformers which is why I think it sounds so good. Also, if I am not mistaken the damping factor of this beast is about 13 which is really low for an amplifier of this power rating. You can translate that into realizing the this was not only designed to be indestructible, it was designed to sound exceptionally good. Conversely, the damping factor of the Phase Linear 700 is 1000. The low damping factor really plays a part in the Mac being so musical for a high powered amp.
At low volume you would think you’re listening to a MAC 1700 or something similar. The amp has no negative characteristic that I can remember. I remember it was musical, and coupled with the C-29 preamp it throws a huge sound stage. At high volume, the sound is crystal clear, never any sign of weakness or lack of headroom. I didn’t dare open it up full gate, it would have set my speakers on fire, I am sure of that. I used one in my home system for more than a decade and never once had any issues. The construction quality is unsurpassed in any amplifier I have owned.
If I could choose between a Mac 2300, 2500 or 2600, the 2300 would be my choice. NO ONE will ever need the power that this amp has on tap.
Yes, I have another audio story to tell. Remember the Apogee Scintilla ribbon speakers of the mid 80’s and 90’s? Amazing sound, incredible, always which I could afford a pair. These were famously difficult to drive, often having a Krell KSA 50 or 100 needed to bring them up to proper listening levels. I have seen the Krells beg for mercy when high volume was asked for while driving these and I have heard stories how they mercilessly destroyed almost any amp subjected to their low 1.0 ohm impedance load.
The Mac 2300 however, will drive the Apogess without so much as a whimper, being rated to drive a .05 half ohm load all day long if asked to do so.
When I was in the middle of packing my home up during a house move, my wife asked if we could have some music. With all the Mac gear packed away I went to the basement and retrieved my Sansui 551, EPI 100’s and my Dual 1219.
I was thinking this is perfect for background music. About 40 min later, we were sitting on the floor in front of the EPI’s listening. My wife asked me “where have you been hiding this at”? That’s when I discovered how good, a well voiced low powered amplifier can sound. We played records all night long. It was an eye opener for me and the end of my desire to have more power that any sane person could want. I wanted to find the most musical system I could. I wanted feel, touch, texture and tone. That experience ended my McIntosh system, but I have no regrets in having owned Mac, or using the MC-2300.
I can find no fault with the McIntosh MC-2300. It’s sounds beautiful, effortless power delivery, wide deep sound stage, and is massively over built. Just a fine sounding, ultra powerful amplifier. This is from what I call the ‘Old McIntosh”, and the design and construction are over the top. If you can find one for less that $3000.00, buy it. You will never regret it and the value is sure to increase. Today I see these listed between $4500 - 11,000 for clean examples. They are worth every penny. More to come!


































