Written review/data can be found on my site here:
https://www.erinsaudiocorner.com/loud...

Amazon affiliate links (earn me a small commission at no additional cost to you):
Polk XT15: https://amzn.to/3rhD2Hf
Polk XT20: https://amzn.to/3nvf0Yp
Polk XT30: https://amzn.to/3qtZkXf
Polk XT35: https://amzn.to/3Fp7a8R
Polk XT60: https://amzn.to/3tqnbsN
Polk XT70: https://amzn.to/34Up4Uj

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All of my tests are conducted using KLIPPEL Hardware and Software. KLIPPEL is an innovative leader in providing unique test equipment for electroacoustical transducers and audio systems. Founded in 1997 by Dr. Wolfgang Klippel, the novel techniques developed for control and measurement systems of loudspeakers and other transducers are the result of over 30 years of fundamental research. This provides more accurate physical models of loudspeakers, microspeakers and headphones valid for both small and large amplitudes. The focus is on revealing the root causes of signal distortion and defects and giving practical indications for improvements in design and manufacturing of audio products. For information on KLIPPEL products, please visit their site below:
http://www.klippel.de/company/aboutu...