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In Reply to: RE: Sanders Magtech Amp posted by stereo5 on October 03, 2016 at 13:13:22
I have a Magtech amp driving Magnepan 3.7 speakers and the sound is fabulous, but keep in mind that it runs extremely HOT, even after a short period of use. Too hot to touch. Not surprising since it requires 2400 watts to operate and is delivering 900 watts into 4 ohms. Sanders recommends that it be kept ON all the time but I don't do that. Make sure you give it lots of space for ventilation.
Follow Ups:
...as 2400 Watts, IF it's connected to a branch circuit capable of delivering 20 amps and IF IF IF it's actually delivering around 900 Watts per channel into 4-Ohm loads. I suspect that most speakers that received 900 Watts of power for more than a fraction of a second wouldn't work after that.
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Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
Edits: 10/08/16
See the link below ...
I love the music of Dmitri Shostakovich ...
NT
Interesting. I've owned the Magtech since December 2011 and it never ran "stone cold". It always ran warm/hot after an hour or so of operation. Admittedly, it has gotten hotter over time so possibly there is a voltage regulator problem. Having said that, the Magtech is a super-performer and the best amp I've ever heard.
As an aside, in another room I have Magnepan 1.7s being driven by a Parasound Halo integrated amp (270 watts into 4 ohms). The sound is excellent and the amp remains comfortably warm during operation. I tried matching the Parasound with the Magnepan 3.7s but it was no match for the dynamics delivered by the Magtech.
Well, this thread has gotten way off topic and I'm sure the original poster has long since moved on.
Hi Charles!Sorry, there was a misstatement in my typing. Roger's designs use advanced transistors which have very low bias points, so they IDLE very cool compared to other amps.
However, during play they will heat up almost as much as any other A/B biased amp. Maybe a little cooler, but there's a reason why they have such massive heat sinks. They certainly do not stay as cool as Class-D amps will.
Best,
Erik
Edits: 10/09/16
OK, now it's coming back to me.
Playing ESL Panels, the Sanders amps DO run cooler than normal. Because they are essentially capacitors, the max current flow occurs at 0 Volts. This is where the Sanders amps are designed to excel.
Playing dynamic speakers, they should heat up normally-ish.
Thanks Erik! Lots of good information about the amp I've been enjoying for the last 5 years. Tomorrow I'll contact Sanders Sound Systems about sending it in for diagnosis.
This whole thing about "stone cold" is becoming somewhat confusing. "Stone cold" = cold, warm, slightly warm ??
The intent was to warn you of a possible issue with the amp..... if it is to indeed run "stone cold". Not doubting your word that it runs hot.
If you contact Magtech about the heat problem please let us know.
I'd be curious to find out what Magtech has to say. I'd also like to know if the amp sounds even better (or not as good) once any repair work is done.
The amp should not be hot to the touch. I sent an email through this page to Charles to send the amp in for warranty repair.
Angela Sanders
Sanders Sound Systems
If only all manufacturers were this helpful and responsive.
No, I haven't moved on yet. I am also looking at the new Spread Spectrum Son of Ampzilla. Not sure if it comes in silver though.
"You have to be trusted by the people that you lie to, so that when they turn their backs on you, you'll get the chance to put the knife in."
Roger Waters
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