As if you needed another opinion…
I wouldn’t get so hung up on the high pass filter- I understand what you want to use it for, but the easier and simpler solution is to run the speakers full range, and blend the sub in. You may find the sound as such is what you’re listening for.
Of course, ideally, you’d need a sub with speaker level inputs. The RSL sub mentioned has them, as do many others.
I looked up your speakers, and the reviews say it has a 7” woofer, which isn’t all that tiny. Unless it’s a deceiving photo, your room doesn’t seem overly large either, maybe mitigating the need to relieve your mains of full range duty.
Either way, I hope you quell your audio nervosa.
+1 !!!
Excuse the repetition, but this bears repeating -
I mentioned I've bowed out of this thread, which I have. I didn't mention I wouldn't add an editorial comment from time to time, so I hope everyone doesn't mind. Again, this is just editorial...
I've always been of the opinion, and have written as much here on this site numerous times, that *in my opinion* adding one or more external subs to a system can be difficult, challenging and produce unexpected, unintended and unwanted results, and that "better" (where better is determined by YOU, the person adding the sub(s)) is in no way guaranteed.
Over the course of my lifetime, I can't get over how often *my opinion* is reinforced.
Best.
Hal
--------- not posted previously, but shall now as I noted Nick has not downloaded MH-GOD -
excerpt from some forum threads.. comments from others....
https://www.head-fi.org/threads/bass-test-songs-my-recommendations.55881/Mickey Hart: Dafos. Recorded by Keith Johnson and released on Reference Recordings. The track "The Gates of Dafos" has a moment that an Abso!ute Sound reviewer measured as going down to 16 Hz. He described it as the aural equivalent of having a UPS truck crash through the wall of your living room, IIRC.
https://www.diyaudio.com/community/threads/best-woofer-50hz-300hz-hi-eff-maybe-15.158170/page-7I do not want or need that. My Quadripole subs are not quite like the usual subs, when there is a pulse of LF (try Mickey Hart's Dafos, Gates of Dafos) the THUD pins you against your chair. No thud - no superfluous woofing going on.
https://community.klipsch.com/index.php?/topic/134617-subwoofers~svs-vs-tapped-horn-vs-fitzmaurice-tht/page/5/#comment-1512810The sustained synthesizer part towards the end had incredible weight, and bloom. Absolutley awesome. on Dafos, a Reference Recordings CD, "The Gates of Dafos, Mickey Hart goes to town on his signature instrument "The Beast". For those of you who are familiar with this "thing" know what I'm talking about.
https://www.tubecad.com/2021/08/blog0542.htmI remember once hearing four subwoofers powered by 500W amplifiers at a friend's house, the famous Mickey Hart Dafos CD playing at full volume, the track The Gates Of Dafos delivering what sounds like a upright piano tipped over or a huge drum kit dropped from the second story.