-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!

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P.S.-- my ears have not been reliable about setting subs in the past, and I currently lack any tech to get objective reality figures..

Well then you really should get something.  Room EQ Wizard with a calibrated mic would work.

The answer, in a real room is :  It depends! Your main speakers may put out a lot more or a lot less bass than you think.  Speaker specifications are usually "quasi anechoic" - meaning they pretend to be in a room with no boundaries or reflections and no room modes. I wrote about this problem here:

 

https://speakermakersjourney.blogspot.com/2021/12/room-speakers-eq.html