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Fidelix 0 SideForce tone arm

Product code: 0-sideforce-basic

Fidelix 0 SideForce tone arm

Regular price $1,531.00 USD
Regular price Sale price $1,531.00 USD
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This is a made-to-order product. Estimated shipping time is 10~14 days.
*The delivery date may vary depending on the manufacturer's order status.

Pure straight arm that overwhelms with clarity, power, and depth of bass instruments

Winner of MJ technology of the year, analog Grand Prix


Traditionally, the first priority in tone arm design has been to minimize tracking error. However, even more important was the time oscillation caused by side force fluctuations. This has been a much bigger problem than tracking error.

Fidelix developed a tone arm with zero side force, hence the product name "0 SideForce". No canceller is needed because the arm always balances itself by moving horizontally even if side force tries to occur.

Without offset angles, the unwavering bass is so powerful that it seems to come crawling from the ground. If you like bass, you won't be able to resist. There is no ambiguity, so it is like a master tape or a well-made digital device.

Made of hard stainless steel and adopts a fulcrum structure with jewel bearings.

The main parts of the arm are made of SUS304, a difficult-to-process and strong stainless steel material.
This, together with the clear fulcrum structure with jewel bearings and the MITCHAKU headshell, firmly supports the cartridge. The front of the fulcrum has a solid structure, while the weight behind the fulcrum is floated orthodox with rubber to eliminate even the slightest resonance noise.

The basic structure is a one-point type with jewel bearings, but in order to eliminate left-right wobble, the record side is weighted so that the 20 mm position below the fulcrum point is intentionally lightly touched. Strictly speaking, this is a two-point structure, but from its pressure ratio, it can be called a 1.01-point structure. Because of this structure, there is a rattling of about 0.1 mm when held by hand, but while playing the instrument, the two points above and the stylus point combined make a clear motion with no ambiguity.

Since this method is a 1.01 point motion as long as gravity is present, true rattling does not occur. The front of the fulcrum is solidly structured, but the weight behind the fulcrum is floated orthodox with rubber to eliminate slight resonance noise.

The installation hole is ø30mm at 232mm from the center of the turntable, but it fits the 230mm Fidelity-Research FR-64 or 235mm SAEC WE-308 without any problem. It is designed for 0 degree tracking error at 89.6mm record radius point.

The arm position is 232mm ±3mm, so it fits the FR-64 and WE-308N holes. 230mm arm position such as FR-64 has 16mm underhang and 0 degree at 84.3mm record radius point. 235mm arm position such as WE-308N has 21mm underhang and 0 degree at 97.1mm record radius point, The record radius is 0 degrees at 97.1mm. The hole should be 30mm in diameter and 232mm from the center of the turntable, but many short arms can be used if a long hole of 215mm to 235mm is drilled.

Distance between turntable and arm center

Normal spec: 232mm±3mm

Long arm specification: 299mm±4mm

Distance between arm fulcrum and needle tip

Normal arm: 214mm

Long arm version: 281mm


Normal spec: 18mm

Long arm spec: 18mm

Needle pressure 3g per revolution of main weight, compatible cartridge: 28.5g (35.5g with sub weight)
Output Rhodium-plated 5-pin DIN
Accessories MITCHAKU headshell (MITCHAKU-L for long version), sub weight, nut driver, hexagonal wrench, SaSuPa


I was interested in reading FIDELIX's article on the 0 SideForce (zero side force) arm.
Of particular interest were the following comments
Among the secrets of the pure straight arm's sound quality is the fact that the arm has no offset.
The fact that the cantilever of the cartridge is aligned on a straight line connecting the stylus and the arm fulcrum, so that the fulcrum on the cantilever side is not shaken by the effect of changes in the resistance of the sound groove of the record, is more important in terms of sound quality than the increased tracking error.
Is that really true?
I heard that the pure straight arm has a disadvantage in record inner circumference distortion, but it has an advantage to compensate for it. As a side note, a London cartridge without a cantilever would have no effect on a pure straight arm, but I doubt it (laugh).
I was thinking that it would be a hassle to buy a new player for the new arm, when I found out that it can be installed on my DP-900M, so I installed it immediately.
FIDELIX specified values: mounting pitch 232±3mm, hole diameter 30mm
DP-900M actual measured value: mounting pitch 232mm, hole diameter 35mm
The hole diameter is 5mm larger, but no problem at all.
Auto arm lifter "The Q UP" also works perfectly.
My first impression is that the sound is very clear and vivid. The sound is also very clear. If this is the sound of the correct arm, then all other arms must be defective. *1Audio Common Sense is Insane