Hi. I've recently received a KJF MA-01 amplifier configured with 3x Hypex NC502MP modules.
When testing it with my speakers (Ascendo Immersive Audio CCRM12-P), which are specified as fairly sensitive at 99 dB/W, I can hear a hiss from the speaker.
My room is a dedicated mancave/tiny home theater with decent sound isolation. The background noise is fairly quiet at about 29 dBA or lower (don't know if my Umik-2 measurement microphone is the limiting factor there).
My Denon AVR-X4200W also has some hiss, but it is only audible from about 1 m, while channel 2 on the MA-01 is clearly audible from my listening position about 2.5 m away from the speaker. Channel 1 on the MA-01 is pretty good though, with the hiss only audible from fairly close (say 0.5 m or so).
See attached pictures of my measurements (both individual unsmoothed and all with psychoacoustic) and corresponding mic setup.
When testing the MA-01 the input pins (XLR pin 2 and 3) were shorted using my highly advanced customized XLR cable (see picture below).
I've read other threads about higher noise on one channel of the NC502MP, likely because of input pins of one channel being very close to some noisy components. I guess my question is if it's possible that you just have to expect one channel to be noisier than a Denon AVR from 2015, or if it could be a problem with this particular amp?
When testing it with my speakers (Ascendo Immersive Audio CCRM12-P), which are specified as fairly sensitive at 99 dB/W, I can hear a hiss from the speaker.
My room is a dedicated mancave/tiny home theater with decent sound isolation. The background noise is fairly quiet at about 29 dBA or lower (don't know if my Umik-2 measurement microphone is the limiting factor there).
My Denon AVR-X4200W also has some hiss, but it is only audible from about 1 m, while channel 2 on the MA-01 is clearly audible from my listening position about 2.5 m away from the speaker. Channel 1 on the MA-01 is pretty good though, with the hiss only audible from fairly close (say 0.5 m or so).
See attached pictures of my measurements (both individual unsmoothed and all with psychoacoustic) and corresponding mic setup.
When testing the MA-01 the input pins (XLR pin 2 and 3) were shorted using my highly advanced customized XLR cable (see picture below).
I've read other threads about higher noise on one channel of the NC502MP, likely because of input pins of one channel being very close to some noisy components. I guess my question is if it's possible that you just have to expect one channel to be noisier than a Denon AVR from 2015, or if it could be a problem with this particular amp?