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The C6 and M4 were tested in HIFI Choice in issue 25 in 1981. That amp worked well with low impedance loads, one channel driven it produced 149/248/343 at 8,4 and 2 Ohms. The downside was the it had an "Average" sound rating despite a very good technical performance. So a mixed bag, " no loudspeaker matching problems" but " somewhat untidy and tending to sound aggressive when loud. --some brittleness--midrange muddling --less than firm bass." But the results were inconsistent among panel members so the reader was advised to listen for himself. Hope this is some help, I couldn't find one on the M2.
I like vintage Yamaha amps too. while i do not have an M2 or any of its cousins, I do own a CA-2010 from the 1977 era. Pix posted in my bedroom system. Gorgeous amp with VU meters. Not meant to drive a hard load & it seems that, back in those, days hard-to-drive speakers did not exist or were very uncommon.
Cwlondon,the entire M series was class A rated for the first 10% or so. The 40-80 series may have been more mass produced with cheaper parts and mediocre circuit boards but they sounded great and had unbelievable amounts of power. Most of them had A/B/C speaker selectors and volume controls built in.
I loved modding this series.
I remember owning a Yamaha A1 Integrated amp - it was a very sweet sounding amp - Pure Class A - and a very attractive design. It was a step up the usual Sansui/Marantz/SAE integrateds at that time. I also had the matching casste deck - it was great as well (Dolby C, green LEDs instead of VU Meters) - a honey!!
MX1000U, MX10000U, CR1020. I have enjoyed all 3 of these terrific amps. Sold the 10000 series gear some years ago. My MX1000U is paired with the CX1000U preamp, and the equalizer of that time AND CONTINUES TO PERFORM IN A BIG WAY, impressively driving 3 pairs of large McIntosh speakers. My CR1020 is in a 3d system I have in a home office and is wonderfully driving a pair of vintage JBL L65s (mint)at the moment. I'M A LONG-TIME VINTAGE YAMAHA FAN.
Sit - JBL L65 was one of my favourite speakers at that time - I could never afford them (to pricey for a hungry student back then) but had great time with various ADS models as well as an ESS speaker. I heard the L65 with some McIntosh Integrateds of the time (MA5100, 6100 and 6200) - a very sought-after speaker far north of what the L100 could offer.
I have a CA-2010 inyegrated- beautiful to look at, beautiful to listen to as well. Very acceptable mc phono stage, of course not extreme in detail but compensates with its musicality and open relaxed sound. Greta engineering in these old pieces DC offset almost perfect when I tested it a few months ago. Gets a bit toasty though in class A mode. I had a CA-1000 as one of my first pieces years ago, but the 2010 is in a different league all together. Currently having my tech service a C4 to try out shortly.
Flg - The L65s sound terrific mostly for rock and jazz. The 70 watts produced by the CR1020 seem about perfect for sound repro for these JBLs. I tried playing them at a higher volume with a 1000 Watt amp (740-960w at 4ohm)and they could not handle it even though they were the 3d set of speakers connected at the time. Quite good for what they are though. You gotta like the now retro look with the smoked glass tops. The crystal tweeter is special and 15" woofers really pound. Fun, CLASSIC stuff.
I have several M2's, including one I purchased new with a C2a in 1982. I found the MX830 cleaner sounding. I think I will try my Yamaha CDR-HD1500 directly into the MX830 (without preamp) and see what it sounds like.
I have gone to tubes with a Canary Audio CA-301 MkII, with Sophia Princess 300B and RCA 6SN7M tubes... very nice improvement over the Yamaha's.
But at the price of used Yamaha amps, they are a nice step in the audiophile food chain.
Reviewing this thread, I still have my M2 and continue to think this era of Yamaha components were particularly beautiful.
Sadly, the back lit switches are often dark, and even from across the room, repairs using LEDs do not look authentic or original to my eye.
Would anyone please know how to restore these gorgeous, glowing back lit switches to their original color and brightness?
I bought an M4 in 1978. Used in my system for 14 years. Then used in a bedroom system for my son thru high school and then taken with to college. Now married 3 years, he still uses it in their apartment system. Currently house hunting, I assume it will be replaced once they're moved in and settled. 36 years and all the lights work and never missed a beat. Better knock on wood.