Spiral Groove SG2

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The SG2 embodies everything we believe to be important in a successful turntable design. The basis of the Spiral Groove design is our constrained layer platform approach.  Three dissimilar thickness aluminum layers, sandwich two layers of damping material, forming a dense, stiff, and well damped platform to which we can precisely mount the working bits of the turntable. Each fuctioning part of the turntable is provided with it’s own isolated layer to carry out its particular function.

To the robust bottom layer of aluminum are mounted both the the height adjustable feet and the motor mount assembly. The motor being the only “active” component of the turntable, it is first de-couple mounted to a round aluminum plate, making for a solid and silent sub-assembly. This is then suspended with tensioned elastomers from the bottom aluminum layer, creating a very quiet de-coupled mass mounting solution. Further, the part of the adjustable foot that interfaces with your shelf is de-coupled from the rest of the SG2 using a similar elastomer technique. This provides the first barrier that any outside mechanical energy must try and pass through to get into the turntable. The middle and thickest layer of aluminum in the SG2 provides the stiffness and mass to which we mount the main bearing and platter assembly. Here, mounted to a massive field, the platter is free to rotate, free of flexure and noise. The top layer, farthest away from any other component, is where the tonearm resides. The armboard of the SG2 is an island of quiet, for any extra energy that resides here, will also make to the stylus. It is no easy feat making a self generated, rotating, and utterly quiet microphone stand, which at the end of the day, is very much how a tonearm and turntable system operates.

The Spiral Groove armboard for the SG2 is mounted from underneath with six bolts, bypassing the bottom two layers of aluminum to as to keep the three layers mechanically isolated.  The armboard can be drilled for any tonearm that is 10” and will accommodate most 12” arms. The tolerances are such that you can have multiple arms “pre set-up” on multiple armboard to switch out for your favorite cartridge selection.

We believe that the SG2 represents a significant value in the world of high performance turntables. It shares so much in terms of design implementation and materials with the SG1.1, it can be difficult to understand how the SG1.1 might significantly surpass what has been accomplished with this model. However, one listen and the magic found in the execution details of the SG1.1 tells the whole story. 

SG 2 FEATURES & SPECIFICATIONS

Aluminum platter ring concept for high inertia and for in stability

Inverted sapphire disc/hardened steel ball bearing for low noise and long wear

Electronically selectable speed control with fine adjustment: 33 1/3 & 45 rpm

Removable arm board

Spindle de-coupled from bearing for optimal mechanical isolation of record

Platter driven at rotational plane of bearing for wobble-free revolution

Low voltage/high torque AC synchronous motor

Adjustable, decoupled, aluminum feet

Dimensions : 18.5 W x 15 D x 4.5 H (470 mm x 380 mm x 115 mm)

Weight : 50 lbs. (23 kg)

AUDIO LIMITS LOGO 265 wide1

702.299.0567