Unstable Imaging - Causes?

have you taken care of your first reflections? can you post a pic at your listening position

A headshell is the unit to which the cartridge is mounted. Some tonearms have detachable headshells, allowing for quick cartridge swaps using mutliple headshells.

-RW-

..an easy way to check for proper azimuth is to use a small mirror (preferably one with the reflective side on the viewing side - a camera repair shop is one place to get such a mirror). Set the mirror on the turntable with the arm resting on the mirror, close one eye... Looking STRAIGHT AND HEAD ON, adjust the headshell to be as perpendicular as possible to the reflection. You're really trying to get the stylus perpenducular, but oft times, its hard to see, and mostly, cartridges are manufactured close enough for you to use the cartridge body as a guide.

Jwglista: The MMf 5.1 as the bellari are un-familiar to me, anyway here are my thoughts about:

+++++ " The entire soundstage will sound evenly distributed until there is a part in the song with a lot of trebble (i.e. sibilance, cymbals, higher octaves of instruments, etc.) at which point the treble shifts slightly to the right. " +++++

Other than you make exactly what Newbee already posted ( on the VTF subject you could try to set-up at the upper VTF limit of your cartridge specs and obviously that the tonearm is flat leveled. ) ) is to check that the tonearm/headshell wires are connected in right way to the cartridge: red one with red cartridge pin, etc, etc, then check if the RCAs tonearm outputs coincide with those tonearm/headshell wires: red wire with right output signal, white one with left output signal, green one with right ground output, etc, etc.

Other than these could be on a cartridge out of target or something wrong on the Bellari.

Regards and enjoy the music.
Raul.

One more possibility: detach and clean all the connections in the analog portion of your system. Dirty connectors can lose conductivity in ways which vary with the frequency and amplitude of the musical signal.

That sounds like what your experiencing. We've experienced it too and cleaning our phono cable leads and phono stage inputs solved the problem.