Bass directionality etc.
Hello, i'm wondering when directionality, phase problems and perhaps other issues arise in a subwoofer - my reason far asking is that i'm considering building a three-way speaker - the mid will start rolling off around 250 hz and was wondering if i could build it as a small sattelite with mid and tweeter, and move the bass into the corner of my room in its own enclosure. To make things clear - i would build two small sattelites and two subs which would probably be placed near the wall behind the sattelites. Probably in a corner or rather close to one.
I'm in doubt when it comes to phase issues - how do these affect the overall sound ? Do they exist at all at frequencies this low ? am i wrong in assuming that the phase issues stop existing at some point - when the wavelength become long enough ? when is this and is this very dependent on the room in which the speakers play.
Directionality is an issue - but again directionality stops being an issue when frequencies get low enough - but how low ? we are still talking stereo-subs so does this make a difference ?
are there any other issues to be aware of ?
Compare the wavelengths of the frequencies you're concerned with (approx XO frequency +/- 1 octave) and the space you're considering between drivers.
Short answer- for 250Hz XO, keep the sub fairly close to the satellite.
250 Hz = 1.3m wavelength - not long enough.
Satellites are mounted on top of the woofer boxes, with some isolation pads. Height was perfect to bring the tweeters up to ear level.
The higher I went up in frequency on the woofers, the more separation I could hear (a bad thing). At present, it is very difficult to tell I have woofers; it sounds like the bass is coming from the satellites (a good thing, IMO).
As I increased the crossover freq. on both of them with the DCX2496, I could hear more and more that the bass was coming from the floor, not the satellites. Imaging got messed up. My conclusion is that 250 Hz is quite directional. Hearing a bass guitar note coming from two locations just isn't natural.
Oh yeah, I've also tried placing the woofers further back, further apart, etc. While I DO get an increase in bass and greater efficiency, I do NOT get an improved blend between them and the satellites. I guess it's a matter of opinion (as is much in audio).
Good luck. Never hurts to try.
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