DS Audio Grand Master Optical Phono Cartridge & EQ Unit

The new Grand Master optical cartridge system has been optimized, by implementing an independent LED and photo-detector arrangement for the left and right channels. As a result the cartridge output voltage has greatly increased from 40mV to 70mV. The Grand Master cartridge offers a

greatly improved S/N ratio when compared to its stable mates, resulting in an even lower noise floor and far greater musical clarity.

The implementation of independent left and right channel LED’ s allows for the positioning of the optical system to be optimized as well as necessitating the use of a new shading plate that has been significantly reduced in size compared to our earlier designs.

In addition to this reduction in size, the material used to produce the shading plate has changed from aluminium (as used in the second generation cartridges) to 99.9% pure beryllium.

A first for DS Audio, the Grand Master cartridge features the combination of a diamond cantilever with a microridge stylus. The cartridge body structure has been designed in such a way as to promote maximum rigidity. In addition to these features, the Grand Master utilizes internal wiring 1.6 times thicker than used in the second generation cartridges in order to reduce impedance.

The DS Audio Grand Master equalizer features separate equalizer and power supply units, each contained in completely independent housings. The use of 2.34 million uF and 2.97 million uF electrolytic capacitors within the equalizer and power supply units respectively has resulted in a significantly stronger power supply design and made improved reproduction of deeper low frequencies possible.

In addition to this, the Grand Master equalizer incorporates special film capacitors custom built to DS Audio’ s specifications and non-induction winding resistors. The design features a total of three transformers, each with a capacity 1½ times greater than that of the DS Master 1. One each, for the left and right channels, with the third handling the power supply to the optical cartridge.

DS Audio Grand Master Specifications:

Grand Master Optical Cartridge

Signal output

Photo-electric Conversion

Channel separation

27db more（1kHz）

Weight

7.7g

Output signal level

70mV more

Canti-lever

Diamond

Body material

Ultra duralumin

Cantilever holder material

Stainless

Needle pressure

2.0g～2.2g(2.1g is recommended)

Stylus

Micro Ridge

Grand Master Equalizer for Optical Cartridge

Output voltage

700mV(1kHz)

Output impedance

RCA 120Ω XLR 120Ω

Pre amp input impedance

More than 10kΩ

Input terminal

RCA terminal

Output terminal

RCA terminal×3, XLR terminal×3

Size

W45.2cm×H15.2cm×D48.6cm(Both)

Weight

25.1kg(Equalizer unit) , 29.8kg(Power unit)