Audio Precision System One / Two Compatible Aes17 Filter

US $546

Warszawa, MAZOWIECKIE, Poland
Jun 11th

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Audio Precision System One/Two Brick-Wall filter plug-in The Audio Precision System One and System Two are great machines for measuring just about anything in audio. Sometimes even a bit too great! One of the luxury problems is that the measurement bandwidth can be too large. The RMS detector easily picks up signals to 500 kHz. And while you can’t hear any of these signals, you certainly can measure them this way. Why would this be a problem? Well, many of the newer sigma/delta data converters and PWM amplifiers emit substantial ultrasonic signal. The PWM carrier of a class-D amplifier for instance, has a constant amplitude. And whilst it is filtered by the L-C output filter, it can hamper you when you’re looking for low in-band THD signals. While you’re hunting for your 0.002% THD+N your detector shows a constant 5% which is not the signal you’re looking for. Enter the AES-17 standard. This standard is intended for a measurement filter and cuts off pretty much everything above 20 kHz, known as the brick-wall filter. This listing is for a System One/Two compatible hardware plug-in Filter, designed, built and calibrated by It's only Audio. All components are 1% or better tolerance, with critical components at 0.1% tolerance. Each unit is hand tested and calibrated to the AES17 specification, and comes with an individual calibration certificate and 1 year Warranty. When you use such a filter, only the in-band audio signal is kept and you can focus on finding the audible parts of the signal you’re looking for. Installed in System Two – 2322 (not included) Typical pass band response Typical stop band response The AES17 spec is closely followed in the passband (+/- 0.1 dB). In the stop band we reach the required 60 dB at 24 kHz. Some extra attenuation is needed around 70 kHz, which is easily achieved by selecting 80 kHz analyzer roll-off in the System One/Two APWIN software. Autodetection (System Two only) In APWIN, go the Utilities -> Filters dialog and the 20 kHz Brick-wall will be automatically detected (System One and early System Two units do not have auto detection built in). The distortion of the Filter circuitry is of course of paramount importance. Test with and without filter in place. No difference in THD+N floor with or without Brickwall 20K filter Listing Contents 20 kHz Low-pass Filter Plugin Unit Calibration Test Certificate Installation Instruction Manual VAT Invoice 1 Year Warranty Free Worldwide Shipping