-6db vs -3db speaker roll-off for sub crossover calculation?

My ATC speakers only list their frequency roll-off as -6db at 48 Hz. All the guidance I can find from SVS and other sub info sources use -3db to determine settings.

Help!

m66932610-14-2022 5:10pm

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fuzztone Details Discussions Posts This discussion Message User 5,635 posts 10-15-2022 at 02:03am Copy Comment URL Report Comment Edit Delete Not gonna matter. Your ears will work fine with the proper setup technic. Try Jim Smith: "Get Better Sound" and have a sub like SVS that has a remote app.
tapp Details Discussions Posts This discussion Message User 10 posts 10-15-2022 at 02:43am Copy Comment URL Report Comment Edit Delete Soundoctor.com is another good test cd for setting up sub(s).
m669326 OP Details Discussions Posts This discussion Message User 330 posts 10-15-2022 at 03:23am Copy Comment URL Report Comment Edit Delete Thanks, y’all.
corelli Details Discussions Posts This discussion Message User 1,016 posts 10-15-2022 at 11:35am Copy Comment URL Report Comment Edit Delete A test CD came with my HSU subs and this was interesting to use. I would suggest you can't calculate a proper crossover frequency as room modes will rule the day. Room placement and your ears are the best place to start. Then if you need to confirm all is well a test CD can help.

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