Effective mass
23.8 g
| Bearing | Gimbal |
|---|---|
| Pivot to spindle | 214 mm The mounting distance — where the arm sits relative to the platter. |
| Overhang | 18 mm |
| Effective length | 232 mm Pivot to stylus: the mounting distance plus the overhang. |
| Offset angle | 23.75° As published. The arm's geometry follows Baerwald (Löfgren A) · IEC. |
| Mounting | Ortofon 3-screw, 40 mm PCD |
| Source | ortofon.com Not yet checked against a primary source — treat as indicative. |
Cartridges that suit this arm
20 of the 67 cartridges in our database that can be mounted on this arm land between 8 and 12 Hz with it — the target band. Figures assume 0.5 g of mounting hardware.
| Cartridge | Resonance |
|---|---|
| Audio-Technica | |
| AT-VM95E | ~8.4 Hz |
| Denon | |
| DL-103 | ~9.5 Hz |
| DL-103R | ~9.5 Hz |
| DL-110 | ~8.0 Hz |
| Goldring | |
| 1006 | ~8.3 Hz |
| 1012GX | ~8.3 Hz |
| 1042 | ~8.3 Hz |
| E3 | ~9.0 Hz |
| Linn | |
| K18 | 8.1 Hz |
| K9 | 8.2 Hz |
| Nagaoka | |
| MP-100 | ~9.4 Hz |
| MP-110 | ~9.0 Hz |
| MP-150 | ~9.0 Hz |
| MP-200 | ~8.2 Hz |
| MP-300 | ~8.0 Hz |
| Ortofon | |
| MC A95 | 8.0 Hz |
| MC Century | 8.5 Hz |
| SPU Classic N | 9.2 Hz |
| SPU Classic N E | 9.2 Hz |
| SPU Royal N | 9.2 Hz |
A tilde marks a figure resting on a converted compliance rating, so treat it as approximate. This is a shortlist from the cartridges we hold figures for, not a ranking — and it says nothing about how any of them sound.
Other configurations
without headshell — 7 g
A different headshell or counterweight changes the effective mass by more than a resonance calculation can absorb, so each configuration is listed separately.
Effective mass is not what the arm weighs. It is the mass the cartridge has to accelerate at the stylus tip, and with the cartridge's compliance it sets where the pairing resonates — ideally between 8 and 12 Hz. Add 0.5 g for mounting hardware when you work it out.
Ortofon and AS-212R are the trademarks of their owner. Bool Audio is independent of them, and this page is not endorsed by them.
Who makes these
Bool Audio is a father and son making hi-fi components in a small UK workshop. We build the Clear Wave unipivot tonearm and the Clear Wave 2.0 tonearm cable, both for the Linn LP12. These calculators began as our own bench arithmetic. They are free to use, there is nothing to install, and they take no view on which cartridge you should own.