It's getting a bit tedious writing about which records the Prime Meridian system offers more than any other turntable I've had in my listening room in the past. Reading about it probably wouldn't be any more exciting – and so I'll end the sound description here.

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Listened with
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| Turntable | Brinkmann LaGrange with tube power supply, Einstein Aerolith |
| Tonearm | Einstein The Tonearm 12” and 9”, Thiele TA01, AMG 12JT |
| Cartridge | Einstein The Pickup, Lyra Etna, DS Audio W3 |
| PhonoStage | Einstein The Turntable’s Choice, WestminsterLab DS Audio phono module |
| Preamplifier | WestminsterLab Quest |
| Power amplifier | Einstein The Poweramp |
| Speakers | Børresen 05 SSE, T5 SSE Kabel Goebel High End Lacorde Statemen |
| Cables | Goebel High End Lacorde Statement, Audioquest Dragon HC, Tornado (HC) and NRG-Z3, Dragon XLR, ForceLines, Swiss Cables, Ansuz Mainz and D2 Ansuz D-TC SUPREME |
| Accessories | AHP Sound Module IV G, Audioquest Niagara 5000 and 1200, Synergistic Research Active Ground Block SE, HMS wall sockets, Blockaudio C-Lock Lite, Acapella bases, Acoustic System feet and resonators, Artesania Audio Exoteryc, Finite Elemente Carbofibre°-HD and Statement, Harmonix Room Tuning Disks, Audio Exklusiv Silentplugs, Degritter, Ansuz Sparks, Darkz Z2S, various Sortz, PowerBox D-TC SUPREME |
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Manufacturer's Specifications
Wilson Benesch Prime Meridian System
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| OMEGA Drive | |
| Description | Synchronous 15” diameter, 21 coreless-slotless, 3 phase zero-cogging, zero torque ripple, patent applied for direct drive motor. The time-average torque is 0.718 N.m @ 1.2A RMS & rated speed of 33.3 rpm. The RMS value of the torque ripple is 0.001342 (N.m). The torque ripple includes all the components (like cogging torque and the current commutation and air-gap flux harmonics). |
ALPHA Drive |
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| Description | Computer controlled quartz referenced high precision sine waves. 3 super linear class A amplifiers. Computer controlled remote control systems |
| Upgrade-Option | The ALPHA Drive supplied with the Prime Meridian System can be upgraded to add a computer controlled pneumatic self-levelling control system for the LeVeL isolation system in the GMT® One System. Supplied as standard in the GMT® One System. |
| Speed Range | 33.3, 45, and 78 rpm |
| Control | fully adjustable via dedicated Smart Device WB Control APP in 0.01 increments |
| Wow and Flutter | not measurable |
GRAVITON® Ti Armwand |
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| Description | Kinematic bearing provides 3-point location ensuring zero Brinelling and the optimal hertzian forces to ensure energy transfer through two different materials. Bearing is designed to allow easy change of Graviton® Armwand in less than a minute. Shortest possible lead out wire to avoid signal corruption. |
| Internal Wiring | Silver / Teflon wire |
| Effective Length | 304.8mm |
| Mounting distance | 291.6mm |
| Offset Angle | 18° |
| Overhang | 13.2mm |
| Effective Tonearm Mass | 14g |
| Cartridge Weight Range | All possible |
TESSELLATE Ti-S Sapphire Cartridge |
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| Hybrid Cantilever | Sapphire cantilever with a U.D. carbon fibre damping ring |
| Stylus | Micro Ridge |
| Stylus Tip Radius | 5x80µm |
| VTA | 20-degrees |
| Coil | Pure Iron Square Coil |
| Weight | 17.1g |
| Cartridge Body & Headshell | SLS 3D additively manufactured titanium structure, with tessellated semi-open geometry |
| Output Voltage | 0.35mV @ 3.54CM/S |
| Internal Impedance | 6 Ohms |
| Frequency Response | 20-30,000Hz +/- 1dB |
| Channel Separation | Better than 35dB at 1KHz |
| Channel Balance | Better than 0.5dB |
| Tracking ability | at 315Hz at optimum tracking force 80uM |
| Dynamic Compliance | 15µM/mN |
| Recommended Loading | 100-330 Ohms |
| Recommended Tracking Force | 1.1-1.4g |
| Optimum Tracking Force | 1,35g |
| Recommended Tonearm Mass | Medium |
| Optimum Working Temperature | 23 Centigrade // 73.4 Fahrenheit |
| Break-In Period | 30-hours |
| Price | 12,000 euros |
STAGE One |
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| Description | Cable management system eliminating tonearm wire mechanical influence whilst providing RF shielding |
R1 Rack |
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| Description | Provides optimal location of all Alpha Drive & Omega Drive systems. Enables complete concealment of all energy systems |
WB GMT® Control APP |
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| Description | Provide GUI for complete remote control over all critical aspects of system including VTA (accurate to 1nM) start / stop, speed and lift lower |
Router & LAN Router |
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| Description | Router provided with the unit, preconfigured with wifi connection to the Smart Device preinstalled with the WB Control APP. Does not connect to the internet |
Finish Options |
The GMT® One System can be specified with Polished Silver or Polished Gold accents to match the GRAVITON® Ti Armwand and TESSELLATE Ti Cartridge finishes. Bespoke component finish options can be applied to the four caps on the glass top of the turntable, the platter weights around the periphery of the platter and the metal components used to finish the R1 Rack |
| Total System Weight | 369.5Kg // 523lbs |
| Prices | € 240,000 (Prime Meridian Turntable) € 32,000 (GRAVITON® Ti Tonearm (Matt Titanium)) € 10,700 (TESSELLATE Ti-S Cartridge (Matt Titanium)) € 23,000 (R1 Carbon Rack (3 levels)) |
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Manufacturer/Distribution
IAD GmbH
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| Address | Johann-Georg-Halske-Str.11 41352 Korschenbroich GERMANY |
| Phone | +49 2161/61783-0 |
| Web | www.iad-audio.de |
| hifi@iad-gmbh.de | |