[Schoenberg]

I just got my Little Dot Mk IV amp/preamp. I am using it as a preamp. There are some issues. I found out that the speaker ringing with the music, especially sensitive to mid and low frequency sound. When I silence the music from the source, the ringing will soon stop.

I am sure it is microphonic issue with tubes. Tubes get vibration from the speakers and make ringing sound then. How shall I eliminate this interaction between tubes and speakers?

I heard on this forum that MkIV is very good as a preamp so I got it. I am not sure how other users deal with microphonic issues.

 

[Schoenberg]

I should also give more information about my gears.
Preamp: Little Dot MkIV
Amp: Rotel RB980BX
Speakers: KEF iQ5 floor-standing speakers
Tubes: 6H30-family powers, EF91 drivers

 

[NumLock]

A pic of the set up? How are they place/positioned? What kind of feet do the have?