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In Reply to: RE: Adcom GTP-400 Arrived posted by E-Stat on July 23, 2016 at 09:27:10
The difference in stage width by itself isn't unusual; but coupled with the rather weak bass, it set off alarms. I was blaming the amp; but the Adcom GPA-400 makes it clear, the amp is fine.
The Rotel RB1050 is dual mono; but the input impedance is 18k ohms. Not super low. Both preamps are spec'd at a 100 ohm output impedance, so they should handle 18k easily. But if the amp's impedance changes a lot in the low bass, from maybe a too small coupling cap it would act like a high pass filter. I've got the schematic, so I have to check that.
Jerry
Follow Ups:
The Rotel RB1050 is dual mono
Are the transformers stacked or do both channels share one as with the Adcom - which otherwise appears dual mono.
RB-1050 pic
Both use a single toroidal transformer with separate windings for each channel, and, of course, separate rectifiers and filter caps.
That's not the case with the NAD C350 which uses separate windings for low and high current power supplies, and then switches between them depending on the load and drive level. The C350 has even a narrower soundstage; my guess would be because of the shared PS; but my big old Onkyo receiver has a wider stage and a massive single supply.
I've read arguments for both dual and single supplies. In the end, it's probably the execution.
Jerry
I've read arguments for both dual and single supplies. In the end, it's probably the execution.
Agreed. And joules!
The power supply for my new microRendu streamer weighs 13 lbs. :)
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