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In Reply to: RE: Least amount of power in to Magnepans posted by mgv on August 05, 2020 at 11:55:15
When I had Maggies, they were some form of SMGs (still don't know exactly what they were, because they weren't rectangular, but rather slightly trapezoidal (a bit wider at the base than at the top).
They were quite happy with 50wpc, when I had them hooked to a Proton D950 for a bit. They were wonderful, when I had an NAD 2200 as amp driving them. They came a bit more alive when I had an Adcom GFA-555II powering them.
At one point? The tweeter wires gave up the ghost, and the woofer wires were getting floppy & pealing off. Got the refurb wire & glue kit from Magnepan, and put them right. Sold them off not long after, and the buyer was VERY happy with the sound.
Follow Ups:
I don't recall a Magnepan that wasn't rectangular. Are you sure it wasn't perhaps Apogee speakers?
I don't remember Magnepan ever making anything other than equal sided rectangle speakers. I had sMGb's that I used for probably twenty years driven by an Adcom GFA 535 rated at 60 watts. The dealer I bought it from tested all the gear going out the door though and never had one test below 90 watts before clipping. I was able to light up the distortion LEDs without much effort though.
LineSource
Built to drive low impedence loads. The 535 would do 60 watts into 8 ohms and 100 watts into 4 ohms. They would even go as low as 2 ohms.
I don't know how much current the 535 put out, but it's larger brother, the 555 could crank out 20 amps.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
The shop I bought the Adcom 535 from tested every piece of gear with you there before taking it home. My 535 put out 95 watts per channel into eight ohms. The staff would place bets on how much 535s would test at.
LineSource
Don't you love it when a company errs on the conservative side rather then skew specifications! Those amps were built well.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
As Magnepan speakers are close to resistive loads, current will not be much of an issue. !00 W in 4 Ohm will be 5 Amperes.
Did you mean not the "main" issue?
Cheers!
Jonesy
From Magneplanars Site...
"What is the best amplifier for Magneplanars?
We have a very small staff and none of us have the time to test amplifiers. But, we have decades of experience with a class of amplifiers that work well with Magneplanars.
The short answer is direct-coupled, Class A/B designs with high current capability. But to learn more, you'll need to read further..."
(see link at very bottom)
"I know just enough to get into trouble. But not enough to get out of it."
Ohm's Law. If the load is almost resistive, your speakers will not draw a lot of current if they are 4-5 Ohm (like most Magnepans). 400 W in 4 Ohm is 10 Ampere, still not very much.
Ah. OK. I thought drawing 5-10 amps would be considered a high amount. And not typical of regular consumer components.
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
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