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VPI Prime Sig/Lyra Delos / Feedback ...help!

Hello all, strange one here...just picked up a VPI Prime Signature Rosewood and a Lyra Delos with about 20-40 hours on it...sounded great at low volume with my sacred Steely Dan - Aja Cisco pressing . Later that night at higher volumes I'm getting a midrange-low feedback . 

Here's my rig : 

VPI Prime Sig with Unipvot / Lyra Delos 0.6m output voltage / 1.75 tracking force

Allnic 1202 Phono Pre (variable DB boost  +22, +24 , +28, +32) 

Manley Snappers / Jumbo Shrimp Pre 

Harbeth 40.3XD 

So I A/B'd w the old turntable VPI Prime Scout / Unipivot / Hana ML 0.4 Output and all was fine 🤔 I then swapped arms moving the Hana to the Prime Sig , no feedback ....🤔

I've tried adjusting the Allnic (all 4 levels mentioned above) and get feedback with the Lyra on every setting...

The hifi business I purchased from said they had tested thoroughly and had 0 problem with it ...so I'm perplexed , this doesn't seem to be any vibration feedback , is the Lyra just not jiving with my Phonostage for some reason? 

Any help appreciated ...

 

tommypenngotti

Showing 2 responses by atmasphere

atmasphere's avatar
atmasphere
12,088 posts
 

So I just bought a 2" butcher block that's (solid AF) & 4 IsoAcoustics pucks,

@tommypenngotti Just so you know, a 2" butcher block doesn't do much to kill vibration. If you bonded it to a substantial slab of marble or Corian (or other dissimilar material) the two materials could rob energy from each other and thus actually be able to absorb resonance.

I had a problem with foot falls near my equipment stand being audible despite some very nice anti-vibration platforms (I didn't have a problem with feedback otherwise). That was solved by placing bearings beneath the equipment stand, which relieved side to side energy.

atmasphere's avatar
atmasphere
12,088 posts
 

Later that night at higher volumes I'm getting a midrange-low feedback

@tommypenngotti Since this is volume related it leads me to think the turntable isn't well isolated from room/air -borne vibration. If it were me I'd be looking at things to improve its isolation- better feet, an anti-vibration platform, that sort of thing.

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