Minus K Technology

Since the early 2000s, Minus K Technology, the developer of Negative-Stiffness vibration isolation, has released several vibration isolation platforms for the high-end audio market. These products have been accepted with high acclaim by audiophiles and audio system manufacturers worldwide.

As the stylus of a cartridge moves through the groove of a vinyl record, the vibrations created by the groove are converted to electrical signals through a coil in a magnetic field. The electric signals are carried along wires to the amplifier which enhances the power of the signal. Since vibrations are converted into a signal which eventually is converted into sound, we can see that any extra vibrations that are picked up by the stylus influence the purity of the signal and hence the sound quality.

Close-up of a stylus point in a LP groove

In a mechanical system such as a turntable, energy in the form of vibration over a large range of frequencies is present. Some vibrations originate from the external environment and are transmitted through the building structure and through floor into the playback system. Other vibrations are caused by people moving near the system or by bass transmitted through the floor. Some vibrations are transmitted through the air and some vibrations originate from the mechanical system itself like the motor, the bearing or the actual stylus interacting with the record. Vibrations interact with each other, resulting in all sorts of complex vibration patterns within the playback system. Ultimately these unwanted vibrations mix with the vibration of the stylus in the groove, causing distortion and unwanted sonic artifacts.

Therefore, the Holy Grail of analogue audio design is to eliminate as much of the unwanted vibration (resonance) as possible so that the stylus can interact with the groove and ONLY with the groove, thus picking up all the musical information without interference or influence by any other phenomena. It is actually impossible to completely eliminate all unwanted vibration, but the more successful you are in reducing it, the better the sound quality achieved. All turntable designs attempt to deal with these resonances to some degree.

The industry's highest performing vibration isolation system is now available in a cost-effective, low-height platform.  The BM-8 Series vibration isolation platform offers true ½-Hz isolation performance vertical and 1.5 Hz horizontal and is easy to use.  No air or electric power is required, there is no maintenance and nothing to wear out.  It is 18”Wx20”Dx4.6”H and is available with nominal load capacities from 25 to 250 lbs.  It is ideal for turntables, CD transports and other audio components. a significant advance in sound quality in a very compact package for high-end audio perfectionists.

The latest generation of Negative-Stiffness vibration isolation technology, embodied within the new ultra-thin, low-hieght CT-2, truly represents a significant advance in sound quality in a very compact package for high-end audio perfectionists.

Our BM-1 Series platform offers Minus K's signature 0.5 Hz performance, both vertical and horizontal, and is available for larger and much heavier audio components. The BM-10 Series offers smaller horzontal dementions at 12.2 W x 12.2 D x 4.6 H (310mm W x 310mm D x 117mm H).

Doehmann Audio Helix 1 (BM-8 fully integrated)

Doehmann Audio Helix 2 (BM-10 fully integrated)

BM-8 with a Simon York Turntable

BM-8 with a VPI Scoutmaster Turntable
BM-8 with a Spiral groove sg1.1 with kuzma 4 point arm and MySonic labs ultra eminent ex cartridge

Custom BM-8C with a TW Acustic Raven AC turntable with a Schroder DPS arm and a Miyabi 47 cart

Two BM-8s under Micro Seiki 8000
(top) BM-8 under Ypsilon VPS 100 phono preamplifier
(bottom) BM-8 under Ypsilon PST-100 Mk. II preamplifier
BM-4 with a Tube Amplifier on a wood 2nd floor
SAT (Swedish Analog Technologies) XD1 Record Player System with Minus K CT-1 [integrated into the platform]

1950 Rim Drive on BM-8 with WS-4 Stand

Ken Fritz's Custom Designed Turntable on Custom BM-1
Video of Ken Fritz's Custom Designed Turntable

Clearaudio Master Innovation Turntable on BM-8

BM-1 under Simon Yorke S7 archival turntable with dual-armboard and SME tonearms. A Nikon 150x microscope with a 5-10 micron resolution graduated reticle and fiber optic lighting is mounted over the platter
BM-8 under Simon Yorke S10 CAT
(Compact Archival Turntable)

Read the Audio Testimonials:

Audio Testimonials

Read the Audio Reviews:

BM-8 review by Widescreen Review audio at: www.minusk.com/content/in-the-news/WideRev_1012.html

Interview of David Platus by Michael Fremer on AnalogPlanet at:

BM-8 review by ecoustics.com at: www.ecoustics.com/electronics/products/articles/711145.html

BM-8 review by Tone Audio at: www.minusk.com/content/in-the-news/ToneAud_0607.html

BM-8 review by 6moons audio at: www.6moons.com/audioreviews/minusk/platform.html

Another review at: www.positive-feedback.com/Issue71/minus_k.htm

Pictures of customer applications are shown below:


What are you looking for? | Let us help | request@minusk.com

What is your Challenge, Need Description or Goal?
First Name*
Last Name*
Email Address*
Country/Postal Code  
Much appreciated, what engine, site or source referred you?
Searched words, other?
Please confirm that you are not a robot


From Minus K: Microscope vibration isolation table, platform and bench top products, plus custom systems for anti-vibration and vibration free microscopy.

Those looking for partial solutions such as from materials or parts involving pads, mounts, mats, rubber feet, etc., might look further into our products for a more thorough solution.