Briefly:
Here is the room 14'W*30'L*10H. Speakers not shown as their location and speakers themselves may vary; usually speakers are conventional two way cd\waveguide+15" or other midbass, in front corners, toed in 45-30º. Subs (2F+2R) placed as expected at half of room height.
Here is measured LF response approximately at "sweet spot". As always (unless otherwise specified) no smooting, without eq\correction, with long default window.
Subs are closed 200 l with conventional old fashioned 18" (Fs 29. Qts .29 Vas ~400+ l), :
One can say it's not sub at all and yes, for open space this is true. But I usually live at home.
I'll gradually add some measurements and details.
Questions, doubts, envy, denials and so on are highly appreciated. And the real experience of others is even more interesting.
Here is the room 14'W*30'L*10H. Speakers not shown as their location and speakers themselves may vary; usually speakers are conventional two way cd\waveguide+15" or other midbass, in front corners, toed in 45-30º. Subs (2F+2R) placed as expected at half of room height.
Here is measured LF response approximately at "sweet spot". As always (unless otherwise specified) no smooting, without eq\correction, with long default window.
Subs are closed 200 l with conventional old fashioned 18" (Fs 29. Qts .29 Vas ~400+ l), :
One can say it's not sub at all and yes, for open space this is true. But I usually live at home.
I'll gradually add some measurements and details.
Questions, doubts, envy, denials and so on are highly appreciated. And the real experience of others is even more interesting.
The first question I'd have is are they enough to cover the space as an array? I've also looked into spacing them greater than 1/4 wavelength so it doesn't require so many. Have you found a higher frequency where it doesn't work as well?
Here is REW simple model for empty room without doors\windows:
In real world every opening or object lowers useful upper frequency and creates irregularities in bandwidth.
Now XO is about 90 Hz IIRC. FR in startpost is with midbass, may be I'll measure and show subs w\o cross this year. And may be I'll add four subs next year..
Hornresp WFS:
In real world every opening or object lowers useful upper frequency and creates irregularities in bandwidth.
Now XO is about 90 Hz IIRC. FR in startpost is with midbass, may be I'll measure and show subs w\o cross this year. And may be I'll add four subs next year..
Hornresp WFS:
Curious, what if the fronts are shifted to the left corner, 3rd harmonic and the rears offset the right?
??
Even "Single Source to Sink" works:
(Ref is w\o rear sub)
REW RoomSim is free and simple, results are similar)) to reality..
Room with DBA isn't open air colunm. It works as PWT insofar as [quasi]plane travelling wave exist. In infinite room without rear wall rear subs not needed.
Or thick enough absorber at rear wall, Single BA, e. g. Nils' SBA, mikela home theater and club in Wiener Neustadt, in last rear absorbtion seems sufficient. There was a club here (is closed now) about <6mW*<3mH*few dozens meters L, with few random subs and combos on stage, w\o rear absorber, but the bass sounded good and like *BA.
In finite room without rear wall will be http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/clocol.html#c1
Was just curious how the driver shifts relative to eigenmodes affected summed response.
Old pic, Umik1 somewhere at listening place and red curve #1 about foot from side wall, where is the protrusion from the demolished partition:
Claimed overhung is 10 mm, presumably suspension limits displacement
Claimed overhung is 10 mm, presumably suspension limits displacement
Nope! 😎
Resonance frequency means approximately nothing if Q is low enough. Constant velocity corresponds to the horizontal frequency response for a plane wave