restorer-john
Grand Contributor
It is clear that use of a single SMPS 1200 in a Purifi-based stereo amp will likely work well. On the other hand, it is also clear that using an SMPS 1200 per Purifi module is not a completely stupid design decision. It seems the negatives and positives of this choice are within the realm of debate - the specifications leave enough room to justify either one.
Possibly someone will ask Bruno his thoughts on this.
In some ways, using one SMPS 1200 could be seen as equivalent to using dual SMPS 600's. If someone has decided on a dual mono amp, the difference in price/efficiency/quality between dual 1200's and 600's makes dual 1200's an easy choice.
There's valid arguments both ways, but based on my experience with any and all SMPS supplies from a repair perspective, the fewer you have in any product, the better. You have twice as much opportunity for failure, but half as much stress on each.
Interchannel PSU modulation issues aside, there's no doubt the twin supplies will offer better performance where the amplifier was running low impedance loads at sustained high power levels. But it could all be academic, as the modules may "thermally limit" anyway, or the PSUs may overheat. And that issue is only likely to occur on a test bench, not in an audiophile's loungeroom.
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