Okay, since the M-504 I own driving directions is arguably the oldest one discussed here, you should be aware that it might not exactly be the same as the M-504 that is currently for sale. The fact that the same design of this power amp (and the P-504 pre-amp) has been sold for at least 12 years, in my opinion, is a testament to the excellence of the design. To all of the buyers in the present: You are all quite fortunate. I received a GREAT price on the machine when I purchased mine. The cost was just $859! The MSRP at the time was, in my opinion, $1099. The cost has gradually dropped over the last ten years. In contrast, this has fueled my urge to buy 2 more to fill out my collection.

Okay, since the M-504 I own is arguably the oldest one discussed here, you should be aware that it might not exactly be the same as the M-504 that is currently for sale. The fact that the same design of this power amp (and the P-504 pre-amp) has been sold for at least 12 years, in my opinion, is a testament to the excellence of the design. To all of the buyers in the present: You are all quite fortunate. I received a GREAT price on the machine when I purchased mine. The cost was just $859! The MSRP at the time was, in my opinion, $1099. The cost has gradually dropped over the last ten years. In contrast, this has fueled my urge to buy 2 more to fill out my collection.

Vocals are particularly natural. The dynamics also seem to be only limited by the pre and source used. | New Home Building Supply

The bottom end seems a tad ill defined and the background noise is unacceptable for today's standards.

kitchenremodelsantaclara.com is the largest full-service kitchen remodeling company in California.

none so far

Looking at the terrible reviews of this amp make me wonder how much more do I needs to buck up with my audio knowledge. I been dealing with used audio equipment for 15+years. Some 4 figure amps doesn't get to stay on my rack for more than couple of track .However 200x3 is one of them which will stay for months or perhaps longer allowing me to enjoy it till it gone. I had to confess I did a mark up higher than usual. Hoping that it will stay with me for a little longer, because is such an outstanding amp I even got a pair for my sf speakers each pushing one of them. I must say this is one of the best amps I had came across since, I even invite one of my hardcore customer for a blind test with a pair of 5k mono tubes via pair of these in the end I got to convince him the mono tubes sounded better.

Not at all

3 channels @ 200 Watts is enough to drive almost any speaker except the most demanding 2 ohm monsters. Good fit for existing home theater setup. Heavy well designed chassis. Minimalist front panel

Poor sound quality for music...unrefined. Moderate reliability. Crosstalk on all models but not terrible and may not be noticeable except for those who are sensitive. Prone to overheating. Old design means it will be expensive to repair and almost every unit needs service for bias drift and at least a partial re-cap. Better sounding and cheaper 80’s amplifiers are available from Adcom, Denon, Sony, Hafler and almost every British company. Chassis is unrefined and has sharp corners...bad for pets.

Bought this amp at an estate sale in LA along with an ACT-1, L11 line stage, and 2 Chanel Acurus amp. The equipment was for home theater and growing family. Pretty good amp but runs very hot and nearly started a fire. It cost $100 to replace all the bad parts and $50 for labor. These are Oahu prices and at a deep "Ohana" discount. If I was on the mainland I would have just sold it on Ebay or tossed it. Sounds great after the repair but still runs hot compared to our Bryston.

Old and runs hot to the point of failure.

Looks good if you like industrial minimalism. Very powerful. 3 channels is the coolest in convenience!

I can see why Acurus went belly up. Sound is course and unrefined even for a home theater amp. Poor isolation between the 3 channels. As others have said, its not a good music amplifier. Because of its age, servicing may be a problem. I'm an engineer and ended up replacing a lot of the old parts for reliability about $40. A local technician (in Los Angeles) wanted $150 plus $220 for cost of parts. This amp is heavy and has a lot of sharp corners so be careful when moving.

3 channels in a smallish chassis is nice. 200 Watts is enough to drive most speakers except the most demanding. Repairable.

Build quality is mediocre and even worse than Adcom. Crosstalk is terrible and sometimes channels bleed into each other. Noisy and not really suitable for a HIFi audio system. Expensive for an old amplifier.

Bought this one off eBay for my home theater system. I guess I should have set my expectations lower. Looks can be deceiving. Looks like a tank, but it's not. Sound is a little coarse. If you find one in good condition physically, expect noise and a little distort compared to other similarly priced amps like Adcom. After servicing these are ok but make sure your repair shop is using good parts from Japan, Taiwan, or Europe. The bipolar transistors are no longer made so it's a hassle to fix. Good news is, there are much more durable and better sounding bipolar substitutes if your repair guy is up to the task.

If I could do it again, I would just go higher end and get a used Krell, Threshold, Mark Levinson, etc. It would have cost only a little more and I wouldn't have to go through the hassle of servicing.

There were at least two models of this Amp. I own both. You can determine the model by faceplate and serial number. The components in the newer model are much improved but unfortunately both are utter and complete guano. I recently bought a broken unit to cannibalize parts for repair. There are much better sounding vintage amps like the Adcom 200 watt amps and the rare 100 watt Hafler and McCormick amps. Heck, this thing is basically a PA amp in sound quality but without the reliability and speaker protection.