I finally got an email from REL distributor in USA to reply to my inquiry (see below). Do they suggest I cross it over at around 25 HZ, or I read it wrong??!!!

In reply to:



Hello,

Thank you for your interest in REL. The best thing to do is to follow the four-step setup procedure outlined on our website, listed below, under REL / Owner's Manuals / REL Setup guide. This will get you to the right position and at the right settings. There is no "right answer" since room acoustics will affect the position of the controls. However, a good guess, based on a lot of experience, is that the crossover will be somewhere in the mid to high 20 Hz range, as the REL will play above the crossover point as well as below.

Sincerely,



Basically, the website instruction, as well as REL manual let you set it up with ear and NO recommendations on numbers are made at all.

Axiom M60s, QS4s, VP100 Onkyo TX-SR804 Oppo 970HD Rotel RB-1080/RCD-1072 REL Q150E sub, PS 3