The SoundFoundations Universal Record Stabilizing Ring (USRS)-MK2 version 775gms

The RSR is intended to reduce resonance in the vinyl surface and to couple the record firmly to the platter. This is achieved by the use of a clamp in the centre of the record as well as the RSR at the periphery of the record. Use of the RSR without a suitable clamp will result in very noisy reproduction along with a strange stereo image presentation.

Read Our Awesome Review Here:

How it works
The outer ring will provide dramatic improvements to the records imaging and sound staging. The absolute peak performance will be gained when there is no free play or movement from the vinyl itself. The Outer ring and clamp essentially locate the vinyl directly to the mat, significantly reducing distortion even with worn record grooves. The 980 Gram Alloy Outer Ring (USSR MK3 ) will reduce and remove the warp in most records except for the most extreme. If the record is more than 3/8 of an inch warp the ring will flatten most of the warp but they may still be unplayable. Caution is advised.
Our newer Signature and VPI monster TT rings take things further with their 1.8 kgs weight Our centering tool accompanies the disc when shipped.
Ring works by reducing high frequency noise caused by microscopic vibration that causes the stylus to “hear” sounds that are not there, this causes listening fatigue. The true high frequencies can be extracted from the vinyl essentially cleaning up the distortion caused by a vibrating the record groove. Play only what is there in the groove. The Soundfoundations Ring provides smooth and accurate sound across the listening spectrum. The quiet passages are beautiful, less background noise, less tracking and VTA errors create awesome dynamics.

There is a marked reduction in surface noise, which is dramatically presented with silence on the run in grooves and also on the run out. This is due to the record being clamped to the platter. Stereo imaging with the RSR is much larger in all dimensions. Speed stability is measurably superior; this is evidenced by playing solo piano, solo voice and flamenco guitar. This is due again to the record being clamped to the platter and the extra centrifugal force as the platter with the RSR has a greater diameter along with a larger mass.
Transient recovery is improved a great deal, as is the overall reproduction of the vinyl. Bass instruments are almost unbelievable in their clarity and weight.. Treble presentation is delivered with consummate ease with no hint of “glassy” extension. Although the RSR seems rather unwieldy, the advantages of this accessory are truly tremendous almost to the point of being so natural that you will listen to the performance rather than the equipment.


  1. Optimum Coupling of Record to Turntable Platter / Mat as no other device can achieve
  2. Lowers Noise Floor Significantly
  3. Will make old worn vinyl sound 100% better and reduces pops and clicks
  4. Eliminates Resonances and Lowers Distortion and End-Of-Side Distortion
  5. Provides Pure Signal Retrieval
  6. Improves cartridge tracking and stabilizes the VTA of the Stylus
  7. Improves Stereo Image and Focusing
  8. Superb instrument separation with wider and cleaner soundstage due to more accurate record tracking
  9. Will flatten most warped records
  10. Gives Improved Signal when Burning Quality CDs from LPs

Material and Engineering Summary:

The Outer Ring is CNC machined from a solid proprietary non magnetic alloy that is resistant to tarnish and staining.
Its then hand polished to a bright and beautiful silver finish
Our signatureTT and some of our VPI rings have additional inserts carefully engineering within the ring along its periphery
The ring finish is such that no harm will come to the cartridge if you lower the stylus on to the ring
The top surface of the ring is less than 0.5mm higher than the LP surface providing excellent clearance for the Stylus on the entry groove of the record with manual and automatic turntables

Specifications and Types of Rings Manufactured by us
In general we manufacture 3 main types depending on turntable used and performance required

  • The original USSR MK3 series, and the Slr series
  • The Signature TT series and
  • The VPI series

Material : Grade 316 SS non magnetic Alloy
Weight : 980 Grams – the MK3 version
Dimensions: 340 mm Diameter x 7.0mm thick.
Inner counter bored diameter 11.900 x .175 deep, the record is inset.

For tt’s that have smaller clearances between arm base and platter or switch and platter (like the pioneer DJ series) or for users who would like some extra downforce
Material: Grade 316 SS non magnetic Alloy
Weight: 1100 Grams
Dimensions: 324mm Diameter x 10.5 mm thick.
Inner counter bored diameter 11.900 “ x .175 “deep, the record is inset.

VPI Scout classic – Alpha VPI version :
Material : Proprietary non magnetic Alloy 316L SS
Weight : 1.8 Kilo Grams
Dimensions: 343 mm Diameter x 16 mm thick.
Inner counter bored diameter 11.900” x .175” inch deep, the record is inset.

Read more here about the URSR LP clamp
and here

CHECKLIST for using a turntable ring clamp
1. Rule no, 1 –
The outer ring diameter is 343mm which is approximately 40mm more than diameter of a record
which means it is 20mm ( 3/4 inch ) lager in radius ( all sides )
This means that all parts of the TT ( tone arm, belt motor, switches etc. ) should be at least 25mm (1 inch )away from the platter edge to use the ring comfortably.
In other words one can imagine loading a record which is 2.0 inches more in diameter ( or 1.0 inch more in radii )
If such an imaginary record can be loaded on your TT without the imaginary edge hitting or fouling with any part of the TT, then you can use the ring

2. Rule 2
The MK3 Ring is 7.0 mm thick which means it will overhang from the record edge downward by 7.2 mm
This means 2 things
First that you platter (at least the top loading face) must be smaller than your record by at least 2mm on each side ( in radii)
( i.e platter diameter must be smaller than record diameter by at least 3.0mm)
Second, because the ring overhangs by 7mm ,the platter diameter must be smaller than record diameter at least for a height of 8.0 mm

Now the MK32 ring is 7.0 mm thick hence above rules apply
Our SoundFoundations signature and VPI TT rings are 16 – 18 mm thick
Hence above rule needs to be looked at accordingly

In other words

  • Maximum platter diameter should not be greater than 300 mm.(at least the topmost face where record loads )
  • The distance from the spindle to the arm base should be at least 170 mm.
  • With belt-drive turntables, there should be at least 10mm between the top of the platter and the belt to use the MK3 ring and should be 1.0 inch if using our heavier rings


Now if the above conditions are not satisfied you would need to buy a TT mat which is thick enough to satisfy above conditions. Since TT mats are always smaller than record diameter by a couple millimeters

Note : We are sorry to say our Outer Rings will not fit the older pioneer DJ turntables

Selecting the Right Turntable Clamp and or Weight System

Light and or Suspended Turntables.

Typically both suspended and light duty tables should have no more than 1lb to 1.3 lb weight/clamp. In some cases a very light clamp system is the only solution without changing the suspension geometry of the table that is designed to support the weight of the platter (it may be heavy) but not a lot more. I have yet to see a table fail from a weight of 1lb like the TTWeight 1LB Aluminum and the other devices in this section.
For light sub chassis models (Thorens TD166, TD160, Linn LP12, Ariston, etc.) a very heavy weight is not recommended because it may effect the proper functioning of the springs and thus will alter the resonance of the design. If your suspended turntable is well adjusted than the addition of this appr. 360gms weight does not alter the suspension

TTWeight Record Clamp, Weight Style (1LB/454 Grams) Aluminum

TT RegaProject Record Weight (.67LB/340 Grams) Aluminum

TTSuperClamp Light (7.0 oz/200 grams) All Aluminum

There are suspension systems that may be tuned and or able to handle additional weight. It is important to understand the limitation of your turntable. Universal fit designed for Direct Drive and Robust and generally non suspended tables.  We recommend this series be used on quality turntables with platters that should weigh more than 1.5 KG’s. This is a rule of thumb; too light a table too light a spindle and bearing design. Any Turntables using this series should have quality bearings and not a light duty turntable. Mechanically the platters must be true, belts, drive wheels, shafts, spindles, bearing; bearing bushing must be in proper working order. The same applies to the electrons including motors, switches, speed controls and connections/wiring.

High Definition, Heavy Duty Robust Turntables 

This section includes robust high quality turntables. Mechanically the platters must be true, belts, drive wheels, shafts, spindles, bearing; bearing bushing must be in proper working order. The same applies to the electrons including motors, switches, speed controls and connections/wiring.

TTSuperWeight Stainless Version 1.8 lbs Internally Dampened

TTMiddleWeight Record Clamp, Weight Style (2.24 LB/1050 Grams) Brass

TTHeavyWeight Record Clamp, Weight Style (3.1LB/1420 Grams) Brass

There was a discussion on the internet about the right size of the spindlehole and some people suggested that the stabilizer should have a snug fit on the spindle of a particular turntable in use. Spindle diameters vary. In my collection of turntables there is only one which has a spindle with a diameter of 7.25 mm. All other tables have spindles which measure slightly less. So the stabilizer’s spindlehole should be at least 7.25 mm. A stabilizr that fits too tight is not easy to handle.


There was also a discussion on what material to take for this weight. Some wanted a heavy weight. They are the people who think that everything that is tight, strong and heavy brings about the best signal. So they think a very heavy clamp is the solution as they also think that damping a turntable with many bithumous sheets makes the music flow. That is not true at all. They forget or do not know that the material and the total weight added do have a specific influence on the quality of the signal.

It is about speed of sound in various materials. The speed of sound in stainless steel is different from that in aluminum.