Speaker Asylum

RE: Bass "sloped response.... tied to directivity as well as response."

143.109.148.201

peppy m.

In Reply to: RE: Bass is hard posted by tomservo on October 25, 2024 at 06:32:46

Why (or how) is that "ideal" sloped bass response tied to directivity ?

They say that bass below 80 hz or so is basically omni-directional.

Or maybe I'm not understanding what it is you've just said ?

Follow Ups:

RE: Bass "sloped response.... tied to directivity as well as response." - hahax@verizon.net 20:56:35 11/01/24 (0)
Deep bass is totally omnidirectional. It can't be located by human hearing. If the deep bass comes from a separate sub woofer with a fast low pass crossover you can stand next to the sub woofer while deep bass is blasting away and you won't hear any bass from the sub woofer bass box even if you put your ear close to it. It will seem to come from the main speakers. All the deep bass directionality comes from higher frequency harmonics.
RE: Bass "sloped response.... tied to directivity as well as response." - tomservo 09:52:21 10/25/24 (1)
Well a great deal of research has been done to find what is the ideal response curve at the listening position and expert listener or not the preferred response shape is a gradual roll off.

goggle this topic, look for Floyd Toole he was one of the earlier researchers into this.

Now the confusing part is, for small speakers that due to their size have little directivity, the response on axis at 1 meter is flat. But as one goes down in frequency where the wavelength is larger and larger, the room is acoustically smaller with less and less absorption.

Below the room's lowest mode, your in the pressure mode where "IF" one had a woofer that was flat to say 10Hz, the room SPL would rise up to +12dB/oct hence a sealed box in that case is idea.

If you have a speaker with significant directivity (and less room involvement), you may have to apply some /all of that slope to get it right at the couch.
- Very informative, thanks ! (nt - peppy m. 10:01:20 10/25/24 (0)
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