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The M3X Isolation Base is the latest generation of reference level isolation bases from Harmonic Resolution Systems. It is manufactured from six different materials including two proprietary polymers, billet machined aircraft aluminums, and polished black granite. The M3X load range is matched to the component weight for maximum performance and can be modified in the future to preserve initial investment. The M3X is the result of more than a decade of research and development into achieving true reference level audio system performance.

This unique design utilizes six different materials to optimize stiffness, geometry, mass, and impedance characteristics. Each material is carefully selected for optimum performance and functionality. The M3X Isolation Base also uses two different proprietary HRS elastomer formulations. The first was developed to maximize isolation efficiency, and the second was developed to control and eliminate residual energy.

A finely polished black granite contact plate is combined with two custom resonance control stages in a billet machined aircraft aluminum frame with a craftsmanship finish and black anodize coating. This exceptional design was created to offer maximum performance, cosmetic elegance, and a durable scratch resistant inlay design that will provide years of maintenance free service.

The M3X Isolation Base is produced in four standard sizes. Each size can be purchased in any of the three different load ranges to optimize component performance.

If one of standard sizes or load ranges does not fit your needs, HRS offers hundreds of custom designs for many different components including all large turntables and amplifiers. Please contact your local sales representative or Harmonic Resolution Systems for assistance with custom isolation bases for your components.

  • Broadband noise reduction system maximizes performance
  • Highly effective on wide range of surfaces and structures
  • Low profile compact design minimizes space requirements
  • Standard and custom sizes ensure full system integration
  • Integrates directly into HRS audio stands without modification (M3X-1719, M3X-1921 sizes)


Dimensions (W x D x H)
inches (cm)
lb (kg)
M3X-2123 23 x 21 x 3
(58.4 x 53.3 x 7.6)
62 (28.1)
M3X-1921 21 x 19 x 3
(53.3 x 48.3 x 7.6)
52 (23.5)
M3X-1719 19 x 17 x 3
(48.3 x 43.2 x 7.6)
43 (19.5)
M3X-1419 19 x 14 x 3
(48.3 x 35.6 x 7.6)
37 (16.8)


Load Range Supported Equipment Weight t
lbs (kg)
RD (Red) 0-30 (0-14)
GRN (Green) 30-60 (13-27)
BL (Blue) 60-120 (27-54)




Product Literature Product Manual

Image Gallery

Close-up of Custom M3X-1923 on MXR Solid brace Insert in MXR Frame
Cusotm M3X-1923 built for pair of Mono Amplifier in Bi-Amp System
Close up of M3X-1921 in Top Location of Maple RXR Frame
Three M3X-1921 as Amplifier Stands
Close-up of Custom M3X-1923 on SXR Signature Frame
Close up of M3X-1921 on MXR-1921 in Birds-Eye-Maple
Close up of HRS Logo Machined into Front of M3X Isolation Base
Close up of M3X Isolation Base Primary Isolation Stage
Close up of M3X Isolation Base on Black SXR Frame
Pair of M3X Isolation Bases as Amplifier Stands on Floor
Pair of M3X Isolation Bases as Amplifier Stands on Floor
Pair of M3X Isolation Bases as Amplifier Stands on Floor
Close up of M3X ISolation Base on SXR FRame
Three Custom Sized M3X Isolation Bases for Amplifiers
Three M3X-1719 in SXR-1719-3V Frame with two M3X Isolation Bases for Amplifiers