The Krell "bright/thin" sound is typical and it's because the power supplies in the Krell processors are undersized. I have been able to fix this by soldering on big 10,000 uf capacitors the rectifier pins on the 3 major power supply sections (,digital, +17V, -17V). This radically turns the Krell into an excellent sounding processor.
However, I don't really have a solution to your EQ issue. It could be a bad DSP board (which is also typical on the S1200 series). This requires sending it back into Krell for service (and costs). Or you could try requesting a return/refund for defective equipment.
However, I don't really have a solution to your EQ issue. It could be a bad DSP board (which is also typical on the S1200 series). This requires sending it back into Krell for service (and costs). Or you could try requesting a return/refund for defective equipment.