This sequence is an example of the many types of tests that can be performed quickly and simultaneously on a loudspeaker production line. It includes perceptual distortion measurement with the new enhanced Perceptual Rub & Buzz algorithm. A stepped sine sweep (StweepTM) from 20 kHz to 50 Hz is played through the speaker and measured via two channels of the audio interface. A calibrated reference microphone is connected to one of the channels and an impedance reference built into the SC Amp or AmpConnect is connected to the other. A HarmonicTrak™ Analysis step analyzes the recorded waveform from the reference microphone, and outputs Frequency Response, THD, Normalized Rub & Buzz, Perceptual Rub & Buzz, Loose Particle Envelope and Polarity. A Post-Processing step calculates the Ave. Sensitivity from 100 – 10kHz. A second analysis step analyzes the waveform from the impedance reference and outputs a curve of impedance versus frequency. Another Post-Processing step performs a curve fit of the impedance curve and calculates the max impedance (Zmax), precise resonance frequency (f0), and the quality factor (Q) of the resonance peak. All measurements and parameter are tested against limits in Limit steps. All these test parameters can be adjusted accordingly.
Ryan Burgess has joined Listen as Manufacturing Manager, responsible for all manufacturing functions including supply chain, assembly, test, Quality Control, and product delivery. Ryan is an experienced manufacturing professional with 20 years’ experience in Engineering, Manufacturing, Supply Chain, and Quality Control Systems. He attended Clark University focusing on Computer Science, minoring in Mechanical Engineering, and also holds several certifications including a Six Sigma Green Belt, certified internal auditor and LEAN Bronze certificate. Prior to joining Listen, Ryan has held management roles in the mass notification industry, aerospace industry, industrial technology, and a global technology solutions company. In his free time Ryan enjoys spending time with his wife and six children, music, sports, and home improvement.