Measurements of the FR30 show a rather odd high-frequency response, don't know whether this applies to the FR20 too:
PS Audio aspen FR30 Loudspeaker Lab Report
Lab Report Honestly rated at 88dB, the FR30's sensitivity is also influenced by the Near/Far setting of the two 64mm planar tweeters. Set to 'Far' the sensitivity reaches 88.2dB/1kHz and 88.5dB (500Hz-8kHz), enhanced by the presence band boost of the tweeters [see Graph 1], prior to their peak...www.hifinews.com
HifiNews is tricky.
Look at their JBL 4349 measurements
JBL 4349 Loudspeaker Lab Report
Lab Report Where you sit may prove vital in getting the very best from JBL's 4349. Avoid the temptation to 'look' directly into the throat of the horn for there's a substantial –14dB notch at the ~1.4kHz crossover [dashed trace, Graph 1].
www.hifinews.com
Vs @amirm ‘s proven Klippel NFS measurements
JBL 4349 Review (Studio Monitor Speaker)
This is a review and detailed measurements of the JBL 4349 2-way Studio Monitor (passive). All of you were too cheap to buy one so I had to do it myself. Out of my own money no less! Luckily I got a discount from the retail cost of US $7,500 for a pair. Note: our company, Madrona Digital...
www.audiosciencereview.com