Audio measurements can be made quickly and easily with Gold Line Audio Test Sets. The TS1RMX incorporates the three most commonly needed functions for calibration and alignment procedures in a standard rack mounted configuration with 3 pin XLR connectors. Included is a true sine wave oscillator allowing a full single range sweep from 20Hz to 20kHz, a dual use frequency counter and a wideband average responding AC voltmeter displayed as dB. The Low Distortion Oscillator: A current controlled, state-variable true sine wave oscillator incorporating a fast AGC circuit. Distortion components are typically 0.1% 2nd and 0.05% 3rd which are low order and not audible making the TS1 & TS2 useful in making listening tests where a function generator would generate undesirable, audible side effects. Full frequency sweeps can be made from 20Hz - 20kHz in a single range. These units have no amplitude changes over the entire frequency range. The Frequency Counter: The frequency counter is internally connected to the internal oscillator and displays the oscillator frequency until a signal is plugged into the input connector. It then displays the frequency of the input signal. This unique combination allows absolute precision in setting frequencies. The dB Meter: The dB meter is a wideband average responding AC voltmeter. The circuit output is converted to dB for display. Direct reading dB greatly simplifies alignment procedures.