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[James Heyser]

I am currently running four of these with four KF650's.  I just ordered the UX8800.  I have had mixed results with these, and have not used them enough to notice any clear patterns.

A few questions I had:

I was considering another set of four.  I see them in quad configurations more often than pairs.  Will this simply add a few decibels, or are there other significant advantages?

Any crossover, compression, or EQ techniques that have helped you get higher quality sound or more output?

I've read some critical reviews of these on PSW/LAB, but they're what I've got, so please limit your replies to tips on how I can better use what I have, not what I SHOULD have gotten!  ;-)

[Steve Ferreira]

http://www.eaw.com/info/EAW/Processor_Settings/Current_Products/Subwoofer_PROCS_rev2.pdf

[James Heyser]

http://www.eaw.com/info/EAW/Processor_Settings/Current_Products/Subwoofer_PROCS_rev2.pdf

Thanks Steve, I should have mentioned that I've been using the manufacturer processor specs, at least with my DR260.  I'm sure I'll notice improvement with the UX8800.  I was considering either lowering the high pass or having overlap with the tops, also hoping for insight about configurations (2x2, 1x4, and 2x4) and even variations in how to stack them.

I haven't had to use them enough to do a lot of trial and error experimentation (I don't generally have time to do that at a specific gig, I just try different arrangements from gig to gig), but I was hoping to get there faster with some advice.

[Justin Bartlett]

I'm not an expert by any means; one of the systems at my church has a single pair of these, and they're...let's just say ample...for the room (a decent-sized gym).

Anyway my understanding is that when you add cabinets to horn-loaded subs like these, you get several benefits:

1.  Assuming power per cabinet is constant, you get a 6dB output increase each time you double the number of cabinets in a given cluster.

2.  Adding cabinets to a cluster increases the effective size of the opening of the horn (due to coupling), thus lowering the bottom frequency at which the horn is effective/efficient.

3.  You also get something of an increase in directionality (which varies with frequency) when using clustered subs.  That's usually a positive, to a point.

That's pretty much the limit of my knowledge; if anyone else has *real* expertise I'd be interested in learning more myself.

[Justin Bartlett]

One other thing - it's my understanding that these cabinets were really designed to be used in clusters of at least four.  Obviously mine aren't used that way, since we only have two, but that's what I've been told.

[John Chiara]

Thanks Steve, I should have mentioned that I've been using the manufacturer processor specs, at least with my DR260.  I'm sure I'll notice improvement with the UX8800. 

The UX8800 isn't going to have an effect on the sub performance.

[Ivan Beaver]

Anyway my understanding is that when you add cabinets to horn-loaded subs like these, you get several benefits:

1.  Assuming power per cabinet is constant, you get a 6dB output increase each time you double the number of cabinets in a given cluster.

2.  Adding cabinets to a cluster increases the effective size of the opening of the horn (due to coupling), thus lowering the bottom frequency at which the horn is effective/efficient.

3.  You also get something of an increase in directionality (which varies with frequency) when using clustered subs.  That's usually a positive, to a point.

That's pretty much the limit of my knowledge; if anyone else has *real* expertise I'd be interested in learning more myself.

If you keep the power constant-then you will get around a 3dB increase in sensitivity.  When you double the power-you will get another 3dB.  So if you keep the voltage (not power) the same-you will get the 6dB increase.

You will get a lowering of the freq response when you cluster them together. However it is not as much as many people think.  What you do get is a larger mouth area-which changes the impedance loading and the ripples in the response (due to to small of a mouth area) are reduced.  So the overall response down low is much smoother-which can make it sound like it has more bass.

You do get additional forward directivity due to the physical size of the "array".

[Bennett Prescott]

The UX8800 isn't going to have an effect on the sub performance.

It will if the EQ, protective HPF, and limiters weren't correct.

[Wichak Chanmuang]

I would not call my advice as tips, but proper use.  First, make sure your amplifier can drive this sub not below 4 ohm load at least 1.5 - 2x its rating power (800 w/ driver) Second, ground-stack only!!, side by side or top on each other in order to create a horn mouth shape. Third, put the right amount of delay to your 650. (around 5-8 ms)
Since you only run 4 KF650, no need to have another 4 BH760 if you do it right..

[Helge A Bentsen]

Be aware that when you set up your rig with a ux8800, you'll need to measure the correct amount of delay on the 650s, because a ux8800 has different input to output processing times on different greyboxes.

[ProSoundWeb Community]