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I can tell you that it looks a lot like a Mac Mc2300 with the autoformers which are no doubt a copy and that's no doubt why they ceased production I would guess.The protection circuitry is different than the Mac power sentry and the BA5000 uses a two stage active load differential amp where the Mc2300 uses a quasi-symmetrical type with complementary pairs.
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Follow Ups:
When these came out, we swore the BA5000 was a 2300 ripoff. Because of the Japanese patent system it is likely McIntosh could not enjoin them from producing the amp. The Japanese were famous for ripping technologies off, registering them and the Japanese courts protecting the companies. One reason why their industry and technology was able to advance and rebuild so quickly. I was involved in a suit by Japanese speaker companies against British companies for infringement based on the British companies exporting product to Japan. The technology I finally traced to a US inventor whom thought the invention too basic to patent. The British companies did patent it after bit in the interim while while the Britain were manufacturing and exporting, the Japanese patented it in Japan after reverse engineering the product. The suit was worth millions of dollars if the Britain lost. After the research and discovery of the US inventor, the settlement was for nuisance value.
Don Brian Levy, J.D.
Toronto ON Canada
and I've compared it to the McIntosh MC 7200 that I also had at that time. Sound wise I thought they were about the same, but, I would give the nod to Sansui when it comes to liquidity. However, both of them ran out of steam in hurry while driving the Theil CS 3.6 speakers at 4 ohms impedance.
If a thing's worth doing, it's worth doing well
(Proverb)
Edits: 11/23/14 11/23/14
Of course the 7200 doesn't have the autoformers but the 7270 does..If the Thiel 3.6s ran out with the 7200 which can really bang out some cajones at 1 ohm,your speakers must have a very vicious curve in the sub 30hz region.
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power amplifiers that don't have a robust power supplies. Having said that, the Krell KSA 250 and ARC D-250 drive it without any difficulties and then some.Thiel CS3.6: Three-way, passive radiator-loaded (reflex), floorstanding loudspeaker.
Driver complement: 10" woofer, 10" passive radiator, 4.5" cone midrange, 1" metal-dome tweeter.
Crossover frequencies: 500Hz, 3kHz.
Crossover slopes: first-order (6dB/octave).
Time response: 150µs, -20dB.
Amplitude response: 27Hz-22kHz ±3dB, 29Hz-20kHz ±1.5dB.
Phase response: minimum ±10 degrees.
Sensitivity: 86dB/W/m (2.8V)
Nominal impedance: 4 ohms (2.5 ohms minimum).
Recommended amplifier power: 100-500W.You can read the measurement here... (courtesy of Stereophile)...
http://www.stereophile.com/floorloudspeakers/225/
If a thing's worth doing, it's worth doing well
(Proverb)
Edits: 11/23/14
This message has been moved to a more appropriate venue .
Edits: 11/23/14 11/23/14 11/23/14 11/23/14
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