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True Audio’s Level Two (1/3 per octave) TrueRTA™ is a real-time software-based audio instrument for testing and evaluating audio systems using a PC with basic sound capability. TrueRTA™ also includes a digital voltmeter that reads true rms voltage and dBu levels, and an audio spectrum analyzer. To set up your own audio test lab you will need a digital voltmeter to calibrate TrueRTA™ for your sound card and a collection of cables and adapters for connecting electronic gear to your sound card for testing. Most sound card jacks are 1/8 inch. If you want to do acoustic testing of loudspeakers in addition to the above you will need a calibrated microphone (True Audio recommends the Dayton Audio EMM-6), a microphone preamplifier or mixer, an audio power amplifier to drive the speaker under test, and cables to connect the line-out of the sound card to the input of the audio power amp. Software can be upgraded to Level Three (1/6th octave) or Level Four (1/24th octave). Minimum System Requirements: 500MHz Pentium III processor and 64MB of RAM