Effective mass
7.5 g
| Bearing | Other |
|---|---|
| Pivot to spindle | 212 mm The mounting distance, meaning where the arm sits relative to the platter. |
| Overhang | 18 mm |
| Effective length | 230 mm Pivot to stylus: the mounting distance plus the overhang. |
| Offset angle | 24.00° As published. The arm's geometry follows Baerwald (Löfgren A) · IEC. |
| Mounting | 20 mm single hole |
| Source | moerch.dk Checked against the source. |
Cartridges that suit this arm
55 of the 67 cartridges in our database that can be mounted on this arm land between 8 and 12 Hz with it, which is the target band. Figures assume 0.5 g of mounting hardware.
Audio-Technica
- AT33PTG/2 ~10.0 Hz
- AT-VM540ML ~10.2 Hz
- AT-VM740ML ~9.7 Hz
- AT-VM95ML ~10.3 Hz
Denon
- DL-301 II ~9.0 Hz
Dynavector
- 20X2 ~8.5 Hz
- DV-10X5 MkII ~9.0 Hz
- Te Kaitora Rua ~9.1 Hz
- XX-2 MkII ~9.4 Hz
Goldring
- Ethos 10.4 Hz
Grado
- Prestige Black3 9.7 Hz
- Prestige Gold3 9.7 Hz
- Timbre Opus3 8.9 Hz
Linn
Lyra
- Delos ~9.0 Hz
- Etna Lambda ~8.5 Hz
- Kleos ~8.6 Hz
Ortofon
- 2M Black 8.7 Hz
- 2M Blue 9.1 Hz
- 2M Bronze 8.7 Hz
- 2M Red 9.1 Hz
- Cadenza Black 9.2 Hz
- Cadenza Blue 10.6 Hz
- Cadenza Bronze 10.6 Hz
- Cadenza Red 10.6 Hz
- MC A90 9.9 Hz
- MC A95 11.8 Hz
- MC Century 11.1 Hz
- MC Verismo 10.6 Hz
- Quintet Black S 10.0 Hz
- Quintet Blue 10.0 Hz
- Quintet Bronze 10.0 Hz
- Quintet Red 10.0 Hz
Sumiko
- Blackbird High Output ~8.4 Hz
- Blue Point No. 3 ~9.4 Hz
- Moonstone ~9.2 Hz
- Rainier ~10.1 Hz
- Songbird ~9.0 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
9 inch light armtube, green · 4 g
9 inch heavy armtube, blue · 14 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.
Moerch and DP-6 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 or tonearm you should own.