SV20h loud hiss on high treble channel


Just bought a SV212H with matching SV212 cab.

Even when the high treble volume is just above    Zero, there is a very noticeable hiss that is almost as loud as the guitar sound when playing clean.     When playing at home volumes and you let a chord ring, you can hear the hiss, surely this can’t be normal? The more you turn it up, the louder the hiss gets.

The normal channel 2 doesn’t have this hiss at all, even when really turned up. 

Is there a fault with the amp, or is this normal? 

It just really spoils playing moderate/low  volumes with  clean sound, I’ve never known a Marshall do this before. 

The official demo’s of the amp by Marshall don’t have the hiss when they pause playing or let a note decay. 



asked 07 Oct 2020 at 11:32 AM

Andy Traverse
Answers: 1


Hello Andy,

It is normal to hear a hiss on the treble channel due to the high amount on the amplifier, the EQ makes some difference, for example turning the treble or presence down will help tame it,  or try using a noise gate ot noise suppressor pedal.


Kind Regards

Marshall Support

answered 09 Oct 2020 at 07:20 AM

Thanks for the answer. Since I have connected a powerbrake attenuator to the amp, the hiss is barely noticeable now, as the amp is turned up much higher than before. - Andy Traverse 11 Oct 2020 at 10:00 AM
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