Record weights 'n clamps: Audible improvements ?

I agree that using a clamp can be very beneficial.

My Basis table and clamp are made for each other, and they work great. And I rarely, (twice, maybe, in 8 years), have had a record warped so much that it affected playback.

The only drawback to the Basis clamps is that they are so $%#^$% expensive. (I think they are running $300 now, (if bought separately from the table.) Ouch! (I know they are very well made, but still, $300?)

My two cents worth.

On my SME 10 the clamp/weight has definitely made a difference and for the better

Ring and clamp will always add audible improvements.

Not always. Most Galibier owners have found any weight smears the presentation with the new graphite platter surfaces. So, YMMV.

I have KAB's older rubber record grip (since replaced by this one), and for the $29.95 I paid, it lowers surface noise, reduces record slippage (better pace, tempo, and transients), and makes really thin pressings such as RCA Dynaflex records sound just like full weight LPs.

IMO record weights and clamps would have different but overlapping effects. A record grip like I have absorbs vibrations coming up the spindle, clamps the record to the mat, and absorbs resonances from the record itself. It also has the advantage that you don't have to adjust the loading of a suspended turntable.

A record weight would do similar things, but the mass of it changes the resonant frequencies of the mechanical aspects of the playback. This could be for better or worse, or for both.

Then there are the ones simply designed for resonance control, that neither clamp nor add a lot of weight, such as the Herbie's Supersonic Record Stabilizer.