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Gday folk I have enough pairs of Richard Allan cg 10 for a quad box. I want to do a pair of boxes. Big enough for 4 drivers aside. Can they be run in the same enclosure or do they need to be separated? I was thinking sealed for the best accuracy. But if the enclosure gets crazy big then a aru might be the go.FS 58
qms3.58
qes.63
qt .536 when new any way
vas 2.63cubic feet do I just times this one by 4? = 8.3cubic feet.If that is right. To big to build. help! How do I calculate a aru? Maybe open baffle ? I could try a single pair in open baffle.
cms 5.3?
no 2%?
mms 14 gramsAnyway I have seen a open baffle theatre baffle done with them in a cross configuration. I have considered line array. But if the cross configuration can work I can sit the horns on top.
Will this work?
Edits: 06/03/14 06/03/14Follow Ups:
Hi mate
I
Have a pair of the cg8's. A friend measured them a while back, I couldn't believe how big a box they needed! So I will go ob and add a ribbon tweeter.
I am in Aus also (Canberra) where are you?
Gday I am in Australia but up north. Did you test for efficiency? I haven't even played any yet. I am only hoping they are similar to cg10T which I have boxed in reasonably small ported box. They have plenty of bass. If they are under 94 I wont bother with them. The cg10t are easy 94.
I will try to fnd the printout tomorrow, I think they were around 96- I have used them with a SE 6BM8 amp, no probs.
My wife found them dull though, so I suspect that is due the roll off around 17kHz, hence my recomendation for using a good tweeter/supertweter
For sealed, you just calculate for one driver, then multiply the volume by four. You'd need about100litres or 4 cubic feet per driver, they'd roll off gently below about 75Hz. There's nothing wrong with having multiple drivers in the same cabinet.
An open baffle with fairly deep wings / an open backed cab would probably get similar performance for less trouble. A 400 litre sealed box is pretty hefty.
With a cross arrangement, you have the issue that when the listener moves from side to side, the path length between the speakers and her ears changes (more than with a vertical line), so you'd probably want to use the lateral drivers for bass only.
By 'aru' if you mean a resistive vent, these reduce the volume required for sealed boxes, not not hugely.
Thanks manYes for 150 hz down or 600 down depending on how they perform. I have a mid bass horn to fit on top that would not if it was an array.
And yes 8.3 cubic foot in insane. I built a pair of 6 cubic feet and they where hugely difficult to get strong enough. I clad them with 3/4 ply after I finished them out of 1 1/4mdf to stiffen them up.
I might try the single driver open first. But I would like to do low bass with them. Given the drivers are 94db I can get approaching 100db 1 watt with the 4 aside. That's what I need.
I guess going Jensen type vented is another option for reducing the size. They do work well in a vented enclosure. I have a single pair that do very evenly in my small room in vented so maybe it's not such a bad idea scaling up that enclosure size that I know works well in the room. Will it still work well when multiplied by 4 in size and number of drivers? I don't know.
If this pic works out you will see what I had in mind.
If you open that auction page and scroll through the pictures you will see the baffle. btw I don't believe for minute the sellers claim that the tesla's sound as good as seimans 14 inch L405.
Edits: 06/03/14 06/03/14
Read this article by Nelson Pass on getting good bass in an open type baffle. Perfect if you want to use 4 drivers per side.
Great article, great acronym - SLOB.
1) seems ideal for matching with a short horn, like a Le cleach
a) the horn would use the OB as an extension of its mouth
b) the depth of the slots would put the centres of the woofers as far back as that of the upper driver - much tidier than having the horn jut out beyond the bass box.
2) looks like one could scale up driver numbers easily - use two slots rather than one.
3) I wonder if slightly splayed or v shaped slots would be a good idea
4) slot depth could possibly be dialed to produce a null where you want to low pass the woofers anyway, to steepen a low order passive crossover
At the frequencies it works at, I doubt that tapered or V shaped slots would matter. It may if you were going to use it up into the lower mids (300 or so).
They always put a smile on my face. And I also have the same Stokowski-with-music-note hair Absolute Sound poster in my listening room, too.
Thanks!
What an impressive body of work.
Extraordinary man.
Hey guys thanks for your input. I will check it out better tonite. I have been down that design road with SLOB but my drivers are very light paper cones and not suitable. I will definitely build a slot loaded sealed or ported enclosure one day when 4 of the right drivers come my way.
I have actually a pair of jabo mid horns and a pair of big university mid bass horns that load down to 200 herts. Whether I include the midbass is yet to be decided. I will post picks on my(facebook) soon. I just having a big clean up of my house before I take the pictures .
Taking my daughter to the circus thanks again guys.
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