Sound Performance Lab 2595 manual Volt Makeup Amplifiers, SPL Supra Op-Amps

Introduction

120 Volt Makeup Amplifiers

With passive filtering comes an unavoidable drop in signal level that requires makeup ampli- fication, and with the Passeq, here SPL’s extraordinary Supra-OPs, with their unique analog 120-volt technology, come into play. With a 116 dB signal-to-noise ratio and +34 dB of head- room, the SUPRA-OPs offer a stunning 150 dB dynamic range, placing them in an unsurpassed leadership position in either analog or digital signal processing.

The tremendously fast SUPRA slew rate of 200V/ms allows for a highest possible precision in filter output signals, particularly in the all-important arena of transient response. These amplifiers effortlessly and without coloration or degradation, transmit all the desired filter characteristics and sonic results an engineer has sought out and in the process, pushing beyond the limits of what has been technically possible to now.

SPL SUPRA Op-Amps

The specially designed and for-audio optimized SUPRA-OPs are constructed in three stages with high performance, extremely low noise transistors from the HF technology sector.

Input Stages of the SUPRA Components

The development of the SUPRA components focused on high loop amplification, extremely low phase shifting and THD, combined with maximum amplification and a frequency response up to 100 kHz.

A main and obvious advantage of the discrete SUPRA components is the exclusion of parts often found in industrially manufactured standard components that are not necessary for audio processing.

The SUPRA input stages are designed as balanced differential stages and comprise six matched high voltage transistors switched in parallel.The concept of the input stage is based on the established principle that currents of not correlated noise sources in shunt circuits add up—which decreases the overall noise of the input circuitry. The input stages are free of coupling capacitors to exclude additional capacitor noise. The balanced operational voltage of +/-60V is delivered from a linear -80 dB high voltage power supply.

Intermediate Stages of the SUPRA Components

The audio signal is further routed to a differential stage and from there through further processing stages to the Class-A output stage. All passive components have been tested to yield the highest possible fidelity.

Output Stages of the SUPRA Components

Extremely low noise, high voltage output transistors are set up with a high quiescent current and excess heat is dissipated via special cooling plates.

8 Passeq