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Calibration, Standards, Accredited, Traceable, and NIST: What do they  
Type:  page Date:  Sep 24, 2025
… reports for your audio analyzer.
In Defense of THD+N  
Type:  page Date:  Feb 25, 2026
… THD+N makes it a superior audio metric to unitless mean…
Quick Tip 112 - Measurement Recorder  
Type:  news Date:  Apr 14, 2016
… QT112 demonstrates the APx500 software's measurement recorder…
What can you do with APx500 Software Demo Mode?  
Type:  page Date:  Sep 24, 2025
…Learn about this free feature in APx500 Software: Demo Mode.  
Quick Tip 155 – CMRR IEC  
Type:  file Date:  Mar 19, 2024
… of the measurement using APx500 audio test software is also…
Hearing Aids  
Type:  page Date:  Jul 17, 2026
… testing capabilities, APx is ready to handle testing of…
Quick Tip 133 - Demo Mode  
Type:  news Date:  Aug 29, 2016
… describing the use of APx500 measurement software's Demo…
Transfer Function MLS Prepend .wav Files  
Type:  file Date:  Feb 26, 2024
This download (zip file) contains the .wav files listed in the table below. Each file contains a short burst of a Maximum Length Sequence (MLS).  For each sample rate, the order of the MLS was
APx500 EN50332 Utility v8.1.0  
Type:  file Date:  Nov 22, 2024
… standard. Works with any APx Series analyzer. This release…
What's New: APx500 v.9.0.0  
Type:  file Date:  Jan 15, 2026
… and improvements in the APx500 software for all models of…
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