Silent Running Voltage Supply4

Audio Band Noise Rejection (over –90dB flat all the way up to 40kHz)

available into lower impedance loads and better micro-dynamics – one listener described it as “having cream in your coffee instead of non-fat soy”.

We recognized that published specifications for noise rejection of opamps and even discrete small-signal amplification circuits did not always tell the whole story. The problem is that Power Supply Rejection Ratio, or PSRR, is specified at one frequency – usually 1kHz, but the truth is that this rapidly gets worse as the frequency rises.

For the GR-Amp, a low-current regulated voltage supply was developed that has broad bandwidth noise rejection so that incoming noise does not intrude on your music. Like the DPDS, the SRVS is also based on the design of power supplies for tube amplifier design. Because of the high voltages involved, tube amplifiers use relatively small capacitors and chokes to produce smooth DC power.

The electronics used for regulation have to be noiseless and fast. Generally noiseless is not a problem, fast is a great problem. Most commercial regulators are good for about 100 kHz. Most chokes are good for at least 1 MHz.

The electronic regulator used in the GR-Amp exceeds the specifications of an excellent choke. It is an exceedingly fast discrete circuit and not a

generic design. Spectrum analysis up to 16 MHz implies a very high bandwidth, as there is no apparent degradation at that frequency. The circuit is of low enough impedance to outperform commercial regulators by at least 10 dB. This is despite the fact that no loop feedback is used in this circuit. To avoid any speculation, it is not a shunt device, it is not a capacitative multiplier, and it does not employ chokes.

4Genesis would like to credit Engr. Nigel Pearson for the design of the SRVS.

Genesis Reference Amplifier Owners Manual Ver 2.0