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A pure straight-arm tonearm that overwhelms with clarity, power, and depth in low-frequency instruments.
Awarded MJ Technology of the Year, Analog Grand Prix
A new benchmark for analog playback: SideForce Zero
The 0 SideForce is an innovative tonearm that directly addresses the fundamental problem faced by conventional tonearms: “temporal fluctuations caused by side force.” By combining a pure straight structural design with jewel bearings, it resolves this issue. Unlike conventional offset arms, the vibrations of the cartridge are not swayed from side to side, dramatically enhancing the attack, low-frequency definition, and clarity of the sound image recorded on the record.
Overwhelming low-frequency clarity and drive brought by the pure straight structure
During the prototype stage, a version with an offset angle was also developed. However, comparative listening tests clearly showed that the pure straight structure was vastly superior. The friction of the record changes with volume, and during fortissimo passages, the stylus is pulled forward strongly. On an offset arm, this force generates complex lateral movements, resulting in delayed attacks and dullness of sound. With the 0 SideForce’s pure straight structure, this 'temporal fluctuation' is eliminated, reproducing bass with a grounded strength and depth. Just as in digital audio, timing accuracy directly affects sound quality. The knowledge gained from CAPRICE’s ultra-low jitter development has been incorporated into the design philosophy of this product.
A structure where side force naturally cancels out — zero mechanism without a canceller
The arm is designed so that even if side force occurs, it automatically balances through horizontal movement of the arm, always converging effectively to zero. Therefore, conventional anti-skating mechanisms are unnecessary. This fundamentally eliminates the problem of side force fluctuations causing temporal instability, ensuring stable stylus operation.
High-Precision Support Achieved by SUS304, Jewel Bearings, and MITCHAKU Head Shell
The arm body is made from hard stainless steel (SUS304), which is extremely difficult to process, combined with a high-precision pivot structure using jewel bearings. While the basic structure is a single-point type, a weight is slightly positioned below the pivot to prevent side-to-side wobble, creating what is designed as a '1.01-point structure.' When touched by hand, a play of about 0.1mm can be felt, but this is a normal operation characteristic of this design. During playback, the needle tip, pivot, and weight demonstrate extremely clear behavior. This is a modern version of the high-quality design once used in Stax UA-3 / UA-7 / UA-9 and Satin arms.
A Design Combination of Mounting Compatibility and Practicality
It supports a mounting hole of φ30mm at a distance of 232mm from the turntable center, fitting without problems to FR-64 (230mm) and WE-308 (235mm). The underhang is 18mm (16mm for FR-64 and 21mm for WE-308). Tracking force can be adjusted at 3g per main weight turn, with 0.5g per increment. It accommodates cartridges up to 28.5g by default and up to 35.5g with the sub-weight. This design fulfills practicality, compatibility, and precision.
An Arm That Correctly Aligns the Time Axis of Analog Records and Releases True Bass
The 0 SideForce tonearm pursues 'accuracy of the musical time axis,' which could not be achieved simply by reducing tracking error. The fusion of pure straight structure, zero side force, high-rigidity materials, and jewel bearings delivers clear, powerful bass and precise sound imaging. This is a tonearm that sets a new standard, delving into the essence of analog playback.
| Distance Between Turntable Center and Arm |
Normal: 232mm ±3mm Long Arm: 299mm ±4mm |
|---|---|
| Distance Between Arm Pivot and Stylus |
Normal: 214mm Long Arm: 281mm |
| Underhang |
Normal: 18mm Long Arm: 18mm |
| Tracking Force | 3g per turn of the main weight, compatible cartridges: 28.5g (up to 35.5g with sub-weight) |
| Output | Rhodium-plated 5-pin DIN |
| Accessories | MITCHAKU head shell (long specification is MITCHAKU-L), sub weight, nut driver, hex wrench, SaSuPa |
I was reading an article about FIDELIX's 0 SideForce arm, and I became very interested.
The following comment was particularly interesting.
“One of the secrets to the good sound of a pure straight arm is that there is no offset in the arm.
By arranging the cartridge cantilever on a straight line connecting the stylus and arm fulcrum, the cantilever side fulcrum does not swing due to changes in the resistance of the record's sound groove, which is more important for sound quality than increasing tracking error.
Is that really true?
Although the pure straight arm is disadvantageous in terms of inner circumference distortion of records, it seems that there are advantages that more than compensate for this. As a side note, a London cartridge that does not have a cantilever will not have the effect of a pure straight arm, but what do you think? (lol)
Well, I thought it would be a pain to buy a new player for the arm, but when I found out that it could be attached to my DP-900M, I installed it immediately.
FIDELIX specified values: Mounting pitch 232±3mm, hole diameter 30mm
DP-900M actual measurements: mounting pitch 232mm, hole diameter 35mm
Although the hole diameter is 5mm larger, there is no problem at all.
The automatic arm lifter "The Q UP" also works perfectly.
My first impression was that I was surprised by the clear, eye-opening sound. It also comes off well. If this is the sound of the correct arm, then all the other arms are defective, and the direct feel is that different. *Audio common sense is insane
