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Old 1st February 2009, 12:12 AM   #1
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Default Mine's too big, wife can't handle it

I am using 4 15" woofers in two Altec 210 cabinets. They are too big for me to move around with just one truck. Can anyone suggest a cabinet or cabinets that will house them but be a little smaller and still get me down to 50Hz?

Woofers:

http://www.parts-express.com/pe/show...number=264-425

I am considered the various cabinet options including bass reflex, scoops, tapped horns even isobaric but I am interested in what you might do if your truck was too small to do it in one load. It would be nice if we could fit all 4 woofers in the size of one of the Altec cabinets and not lose too much along the way.

The existing cabinets are approx:
84 x 39 x 31 inches = 60 cu ft per cabinet
2135 x 990 x 785 mm = 1.7 cu meters
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Old 1st February 2009, 04:31 AM   #2
tb46 is offline tb46  United States
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Hi Cal,

That's quite a system, it reminds me of something that took over my living room in the mid 70s. :-)

As a starting point I like to suggest a vented alignment from Boxplot with all 4 woofers. The problem with these drivers is their X_max of 9mm prior to physical damage (according to the data sheet). That limits the amount of power that can be applied to quite a low value (about 100 W into all 4, even with a 30Hz low cut), on the other hand the box size is well below your requirement.

At the same volume a single woofer will deliver an impressive output in a tapped horn.

Good Luck, Regards
Oliver.
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Old 1st February 2009, 04:34 AM   #3
tb46 is offline tb46  United States
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And the tapped horn:
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Old 1st February 2009, 05:00 AM   #4
tb46 is offline tb46  United States
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And a dual driver tapped horn (that could almost be moved without a crane, as long as it is divided into two boxes):
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Old 1st February 2009, 05:22 AM   #5
tb46 is offline tb46  United States
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And just to get up to your volume limit: a tapped horn quad:
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Old 1st February 2009, 05:31 AM   #6
tb46 is offline tb46  United States
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I guess, the above suggestions would all fit within your requirements, and provide an even lower frequency limit. Obviously something like the Quad would be best build from four separate boxes to facilitate handling. This would additionally have the advantage of a great deal of flexibility.

Anyway, thanks for providing an interesting challenge, Regards,
Oliver.
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Old 1st February 2009, 09:08 AM   #7
FlipC is offline FlipC  United States
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Freakin aye those things are huge.
If those things stop at 50 hz throw them away. 1699 Lt should brown note you.

Not a driver I would purchase unless I got them for dirt cheap
But alas. Real quick mock ups

Dual Parallel 15" Tapped Horn@ 504.731 Lt 2Pi 23v
125 Db w/cut off @v 25Hz

S1 = 500
S2 = 554
CON 1 = 12
S3 = 2540
CON 2 = 269.79
S4 = 2740
CON 3 = 24
S5 = 3200
CON 4 = 16.90

Next is the HORNY. 353.304 Lt 2Pi 30v
125DB good up to 150Hz range.

S1 = 575
S2 = 4000
Hyp =200
Vrc =20
Lrc =10

You can play around with this one and get better response probably. I just plugged the driver into what I already had.
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Old 2nd February 2009, 04:50 AM   #8
simon5 is offline simon5  Canada
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+1 vote for the quad tapped horn.
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Old 2nd February 2009, 04:52 AM   #9
Aengus is offline Aengus  Canada
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Quote:
I am interested in what you might do if your truck was too small to do it in one load
Buy a bigger truck?
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Old 2nd February 2009, 05:18 AM   #10
simon5 is offline simon5  Canada
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Hahaha the easy way out ! I like it.

Trucks are cheap these days...
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