Acoustic Solid - Solid 311 Metal Turntable

Package 1 contains WTB-370 Tonearm Only! No Cartridge! Microcontroller motor control M2 with crystal oscillator

Package 2 contains WTB-213 Tonearm Only! No Cartridge! Microcontroller motor control M2 with crystal oscillator

The Solid 311 Metal is a belt-drive turntable from Acoustic Solid (Germany), available at Vinyl Sound in Toronto, Canada. Built on the same all-aluminum chassis architecture as the Solid 110 Metal, the 311 Metal introduces a critical engineering distinction: a dual-belt drive system using two Nylon-silicone belts driving a 6 kg, 30 mm thick CNC-machined aluminum platter, paired with a high-gloss aluminum motor housing that integrates the Berger Lahr synchronous motor and Microcontroller M2 quartz crystal control into a single unit. Speed synchronization is measured at 0.08% with an Ortofon measuring computer, with one-touch 33.3 and 45 rpm switching and real-time fine adjustment. Available in Package 1 with the WTB-370 tonearm or Package 2 with the WTB-213 tonearm — cartridge not included.

Dual-Belt Drive System

The defining feature of the Solid 311 Metal within Acoustic Solid's lineup is its dual-belt configuration. Where the Solid 110 and 111 Metal use a single Nylon-silicone belt, the 311 Metal employs two belts running simultaneously from the motor to the platter. This arrangement distributes drive force more evenly around the platter circumference, reduces the lateral load on the bearing from belt tension, and further isolates motor-induced micro-vibration from the platter. The result is a more consistent transfer of rotational energy and a lower noise floor at the stylus-groove interface, without increasing platter mass or chassis footprint beyond the 110 Metal's dimensions.

Integrated Motor and Controller Housing

Unlike the Solid 110 Metal where the motor and controller are separate, the Solid 311 Metal integrates the Berger Lahr synchronous motor and the Microcontroller M2 quartz crystal oscillator into a single high-gloss aluminum housing. This consolidated design shortens the signal path between controller and motor, reduces external wiring, and presents a cleaner, more unified aesthetic on the listening room shelf. The Microcontroller M2 maintains 0.08% synchronization accuracy, with both 33.3 and 45 rpm selectable at the touch of a button and fine adjustment available at any time during playback. The 50 mm base carrier plate and feet remain fully decoupled via Teflon discs and silicone mixture dampers, with height adjustment through threaded spikes on felt feet.

Key Features

• Dual-Belt Drive: Two Nylon-silicone belts drive the platter simultaneously, distributing rotational force evenly, reducing bearing lateral load, and lowering motor-induced vibration at the stylus.
• Integrated Motor and Controller Housing: Berger Lahr synchronous motor and Microcontroller M2 quartz oscillator housed together in a single high-gloss aluminum unit for a cleaner signal path and unified design.
• 6 kg, 30 mm CNC Aluminum Platter: Precision-turned and hand-polished aluminum platter with genuine leather mat and 3 mm Plexiglas pad at the record interface.
• Microcontroller M2 with Crystal Oscillator: Quartz-referenced motor control delivers 0.08% speed synchronization with one-touch 33.3 and 45 rpm switching and real-time fine adjustment.
• 50 mm Base Carrier Plate: Ø 180 mm aluminum base plate and feet decoupled via Teflon discs and silicone mixture dampers for multi-stage resonance isolation.
• Polished Ceramic Ball Bearing: Ground stainless steel axle with cast liner, cast bearing bottom, Teflon decoupling, and polished ceramic ball contact point for low-friction rotation.
• Genuine Leather and Plexiglas Platter Mat: Leather mat with 3 mm Plexiglas pad for optimal record contact and vibration control at the record surface.
• Two Tonearm Packages: Available with the WTB-370 (Package 1) or WTB-213 (Package 2) tonearm — cartridge not included.

Technical Specifications

Frequently Asked Questions

What is the Acoustic Solid Solid 311 Metal?

The Acoustic Solid Solid 311 Metal is a belt-drive turntable from Acoustic Solid of Germany, featuring a dual-belt drive system, a 6 kg CNC-machined aluminum platter, and an integrated high-gloss aluminum housing combining the Berger Lahr synchronous motor and Microcontroller M2 quartz crystal speed control. It weighs 12 kg without tonearm and is available in two tonearm configurations with no cartridge included.

What is the difference between the Acoustic Solid Solid 110 Metal and the Solid 311 Metal?

The Solid 311 Metal and Solid 110 Metal share the same platter mass, chassis dimensions, and base carrier plate specification. The 311 Metal's key upgrade is its dual-belt drive system, which replaces the single belt of the 110 Metal with two parallel Nylon-silicone belts for more even torque distribution and lower bearing lateral load. The 311 Metal also integrates the Microcontroller M2 and Berger Lahr motor into a single high-gloss aluminum housing, where the 110 Metal keeps these as separate units.

How does the Acoustic Solid Solid 311 Metal compare to the Clearaudio Concept or Pro-Ject RPM 9 Carbon?

The Solid 311 Metal sits in a similar tier to the Clearaudio Concept and Pro-Ject RPM 9 Carbon as a serious analog front end with precision motor control. The Clearaudio Concept uses a magnetic bearing and single belt, while the Pro-Ject RPM 9 Carbon features a carbon fiber tonearm and single-belt AC synchronous motor. The Solid 311 Metal differentiates itself through its dual-belt drive architecture, full all-aluminum unsuspended construction, and integrated quartz-locked motor controller — a combination not offered as standard by either competitor at this level.

Why does the Solid 311 Metal use two belts instead of one?

The dual-belt system on the Solid 311 Metal distributes the drive force from the Berger Lahr motor across two contact points on the platter circumference rather than one. This reduces the net lateral force on the platter bearing from belt tension, lowers the transmission of motor-induced micro-vibration to the platter, and delivers more consistent rotational energy transfer — all contributing to a lower noise floor and more stable speed under stylus load compared to a single-belt arrangement of equivalent tension.

Does the Acoustic Solid Solid 311 Metal come with a cartridge?

No. Both Package 1 (WTB-370 tonearm) and Package 2 (WTB-213 tonearm) are supplied without a cartridge, allowing the buyer to select a cartridge that best suits their phono stage, system character, and budget. Vinyl Sound Toronto can advise on cartridge pairing for either tonearm configuration.

Where can I buy the Acoustic Solid Solid 311 Metal in Toronto or Canada?

The Acoustic Solid Solid 311 Metal is available in Toronto, Canada at Vinyl Sound, an authorized Acoustic Solid dealer. Vinyl Sound's team can assist with tonearm package selection, cartridge recommendations, phono stage matching, and full setup support.