Anyone compared Sanders Magtech vs. McIntosh MC462/52 or MC611/01 with Magnepan 3.7/20.7?


I know a lot has been written about all of these amps with the 3.7 and 20.7 series Mangepan's, but I was wondering if anyone has done a direct comparison and can describe the differences in what they heard?

Yes, I know, the best way is to demo them myself, and I will be this coming October... but until then, I would be interested in getting other's opinions to prepare myself for certain things to listen for, think about, etc.

Contrary to all of the popular opinions out there on the net that you needs gobs and gobs of watts to make the Magnepan's sound good, that is not my total experience. I have a new pair of 3.7i's (one month old) and am running them off of the 8 ohm tap of a McIntosh 6700 integrated 200 wpc amp. It actually sounds fantastic with plenty of warm bass, and depending on recording, can be chest pounding - from either vinyl or digital. My audiophile jazz recordings with piano, guitar, vocal, drums, and upright bass are the most accurate (compared to a live jazz club) I've heard.

The issue is, I have to turn it up to a volume that would be similar to what you would hear live - which is fine when in the mood, but at times I would like to listen at a lesser volume. There seems to be a certain volume threshold that when crossed over, the speakers open up and do their magic / crossed under, they all of a sudden lose their good charms - dynamics and bass all but disappear. 

So, from what I've read, what I'm experiencing is from lack of proper wattage from the power amp, thus I'm on the upgrade path - I'm sure any of the above amps (in the title) would be an improvement as the least of them is more than doubling my current wattage - but I'm curious if anyone has compared any of these amps paired with the Magnepan's. If so, do they improve dynamics and bass? What did you like about one and not the other and vice versa, etc.? 

Thanks and looking forward to hearing your opinions --cheers!

Jimmy
128x128jimmy_jet

Showing 2 responses by lucidear

Jimmy

I’ve been scratching my head and just can’t get over the idea that the manuf. would put taps (4 & 2) on an amp where in reality you wouldn’t need them, in other words if the 8 ohm tap is not only sufficient but actually provides more current/power than the 4 ohm tap then why spend the money to put those in the amp?
And wouldn’t they state that somewhere in their literature? Something like :" hey you got 4 ohm speakers? No problem just use our 8ohm tap, it provides 80% more power than the 4 tap!"
This just doesn’t make sense...

in fact there is a chart in your amp’s manual which specifies different gauge and legnth requirements for speaker wires based on the speakers impedance, which I believe indicates manufacturers intentions plainly-> 4 ohm taps for 4 ohm speakers etc. ...

Also,
if you look at the measurements for the 3.6 in Stereophile, and the 20.7 in hifinews these drop respectively to 3.5 and 2.0 ohms at certain points...
my "uneducated guess" is that this is where you’re hitting problems, where the speakers dip low and the 8 ohm taps are not sufficient.

Lastly
I’m sure you know of the minimum 3-5 feet (some say 7-10) distance from the walls behind them...
and I was gonna tell you that they’d need 300-500 hours to settle down, now Elizabeth’s experience is apparently something like 1000-1500 hours...
good luck