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Old 7th February 2007, 02:15 PM   #1
eris is offline eris  United States
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Default Hi Power Chip Amp Anyone?

Does anyone have a chipamp design that could easily drive a stereo pair of Magnepan 1.6QRs? They are a challenging 4ohm load and require at least 120W / Channel into 8 with something that can go down to 4ohm.

I was thinking that a pair LM4780's running in bridged-parallel mode per channel should do the trick. That and a boatload of capacitance plus a 300VA/25 volt dual tap Hammond transformer per channel so you've got dual-mono operation.

Anyone with experience driving eletrostats or planar ribbons with Gainclones? Any special problems other than the low impedance and high power requirements?

thanks guys...

(BTW: I've been reading the Zero Distortion power supply design article and its very informative http://www.zero-distortion.com/techn...powersi_05.htm)
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Old 7th February 2007, 07:10 PM   #2
AndrewT is offline AndrewT  Scotland
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a second-hand Krell seems more suitable than a chipamp or group of chipamps.

Or join the KSA100 Klone threaders and build your own Magnepan driver.
regards Andrew T.
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Old 7th February 2007, 10:54 PM   #3
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Default ESL's and chips

I had the chance to preview one of my BPA300+ chip amp designs on a set of Martin Logan Summits, the amp preformed perfectly, but my amp cost well over 1K dollars to assemble so I would have to agree with Andrew T look at the krell clone threads would probably be cheaper in the end and work as well or better
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Old 16th February 2007, 12:50 AM   #4
billbo is offline billbo  Australia
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Location: Sydney
Default stk amp

If you are on a budget and want resonable performance, try a couple of stk4048xi's. They are cheap, work great and easy to build. I have posted pics in the amp gallery on page 28
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