I have a conundrum, looking for another 18" driver to pair with my existing Mal-X driver. Current plan calls for two enclosures, 20" W x 36" H x 16.5" D to replace the current 24" x 24" x 24" cube I am using for my Mal-X driver (spouse hates how far the current sub projects to far into the room, since I will be building one new box just as well build two).
Both the Dayton Audio and SI drivers model well in the enclosure, but with their limited excursion leave a lot of the mal-x's performace on the table. Per winISD, the mal-x can take 2000W/4ohms to reach Xmax (with a 5 Hz HPF second order BW to mimic rolloff from signal chain) with an output of 111.346 dB at 20 Hz. In contrast, the Dayton Audio RSS460HO-18 reaches 20 mm cone excursion with 750W/4 ohms at 106.98 dB at 20 Hz. There is a similar loss across the entire audio range due to having roughly half the excursion limits.
Both enclosures have similar Qtc (.673 vs .682). Sorry for lack of graphs but am posting from a cell phone. The TC Sounds and RE XXX drivers are out of my price range of $400-500.
Spent 4 hours searching for 18" drivers on the net, many are "not available" or are designed for car spl competition and not HT/music performance. Room is right at 5,000 cu ft so plan to have a total of 4 subs in the end. Use - Primarily music (80%) with remainder HT watching action type movies on front projector based system. Main speakers are upgraded 4 Pi's. Have a Behringer Feedback Destroyer and miniDSP units for eq. Will need sub amp, leaning towards a QSC PL340 or Crest CA12. I earn my living by producing intellectual property, so I have zero desire to support knockoffs or clones (I do not have any issue with persons who go that route but am willing to spend more and potentially get less. I do it all the time here in Cambodia by ordering movies from the US vice paying $3 for bootleg copies of movies at local vendors).
Thanks for any suggestions!