OP
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- Thread Starter
- #21
The Norma Revo IPA-140 has over sensitive or just badly designed DC protection.
We also know this specification is likely misleading....: Frequency Response: 0 Hz – 1.8 MHz (-3dB, non filtered)
Put a series 2.2uF capacitor in line (each RCA hot) with the external Topping D/A converter. Coupled with the input impedance of 10K, that would likely solve the problem for you without impacting the bottom octave too much. Without a subsonic filter, the internal D/A converter connection is harder to solve.
So I soldered a couple of Wima 2.2uF caps on a new pair of cheap RCA-cables as you advised. Good news is that the amp no longer goes into protection mode when viewing The Expanse.
Bad news is that I have to turn the volume up to 80% and sound is truly anemic with no bass at all. Tested also with music thru Roon, unlistenable I'd say.
Oh well, I can live without The Expanse. Maybe time to look for another amplifier even though I'm really fond of the Norma.