Spectron Musician trun on noise / tweeter hiss

I have the Spectron Muscian III SE. On turn on there is a momentary crackle. nearly inaudible but its there. The same is not true of turn off, just silent. I have absolutely no hiss, even with my ear right up to the tweeter its dead silent. Try disconnecting everything else in the chain and listen for the hiss again, 10 to 1 its NOT the amplifier, but something further up-stream

My Spectron Musician III SE Mark 2 gives a slight tick in the left speaker on turn on (I leave it on 24/7 but occasionally replace a power cord or speaker cable setup, so off the amp goes temporarily). No hiss whatsoever.

Thanks Folks for your responses. My upstream components consist of an AYRE K5X preamp amd AYRE C5XE universal player. All interconnects are balanced; Kimber Select between the pre amp and amp; Cardas Golden Reference between the disc player and preamp.

I've also encountered an issue with my tuner, which now only presents music that is total static!

However, my intial impressions are very favorable. I replaced an AYRE K5X with the Musician mainly because I was never really happy with the bootom end of the AYRE.

Once things settle down I'll be able to post my impressions.

Where's your tuner in relation to the power amp? You need the tuner as far away from the amps and CDP as possible, unless it's very heavily shielded (you didn't mention the brand).

CDPs and Class-D amps can spew a lot of RFI/EMI and tuners are the most likely to be negatively impacted. I see you're running balanced, which is critical in Class-D, but does you tuner allow balanced? Make sure that the antenna lead doesn't run too near the amp.

If the whole shebang is in a rack, then try to get the amps on the bottom and the tuner on top. Ayre tends to shield their stuff pretty heavily, so maybe the CDP won't interfere with the tuner too much, but putting the pre between the CDP and tuner would be good.

Once you solve all this, then leave it on all the time. (BTW, I love Class-D and ICEPower stuff, using Rowland myself).

Dave

My MK2 is dead quiet even with my ear up to the speaker's tweeter and midrange.

Besides what has already been mentioned the amp likes clean power. It wouldn't be bad to use a good power cord connected to a condtioner like the Shunaya which allows unrestricted power delivery and diverts the noise at higher frequencies to neutral. Conditioners based on serial/baum device conditioners will restrict power to the unit so I wouldn't use one of these.

Do you have a dedicated 20 amp line for the amp? That migt help also.