How do SPL measurements work? (1 Viewer)

[Mal P]

Hi there,

Say, a subwoofer is capable of 105dB at 30hz, and 91dB at 25hz. If I listened at 85dB, would the volume at both frequency points be even? Or am I getting this wrong?

Thanks,

Mal

 

[Brian Fellmeth]

The 2 are unrelated. The db it is "capable" of is the point where distortion is too high or the driver bottems. This "physical" limit will vary with frequency. When playing well below this limit, say 85 db, then the variation of SPL with frequency will depend on many things but not the physical limits of the sub.

 

[Kyle_W]

It also shows where the subwoofer peaks at, so the box should be tuned to about 22hz if you want it to peak at 30 which would be the subs loudest point