2. speakers
  3. 163320-130894

Midrange Noise

I have a Rega P3 turntable hooked up to an Aesthetix Rhea phono preamp to a Unison Research Unico 100 Integrated Amp to a pair of Sonus Faber Futura speakers. After half a year I started hearing a humming/buzzing noise out of my midrange. It is affected with the volume knob. Also when I switch the phono preamp to mute it also goes away with the volume knob up. When I select the input knob to CD, it also goes away. So I assume it is not the speakers. What could it be in the Aesthetix phono preamp to cause the noise in the midrange driver?
timyamasaki

Showing 2 responses by timyamasaki

timyamasaki OP
10 posts
 
It is just on one of the speakers. It's more like a lower frequency static-type of noise that quickly goes in and out sporadically.

The Rega P3 does not have a ground wire to the phono preamp. I have yet to replace the tubes, but I was wondering why it only affected the midrange. Perhaps the impedance at the midrange frequency between the phono preamp and integrated amp is a causing this problem.

I will also check the interconnects and also change between left and right channels to verify electronics vs. speaker.

Thanx for the replies.
timyamasaki OP
10 posts
 
I finally got to replacing the right speaker with the one that I used before, an Opera Quinta. There is still the same buzz/hum in this speaker as long as the phono preamp is powered and unmuted and the integrated amplifier volume is up (one-fifth of a turn). Just like before.

I will give Jim White a call at Aesthetix.
More to discover