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[David Trotter]

just thought i would post up about my latest bin design. I showed you all the models and the idea a while ago and i have since built a prototype, tested it and am awaiting the wood to come back from the cnc place to build 8 as test phase 2!





right, so I don't have the equipment to do a smaart test etc, but i did a simple easy and dirty test using a signal generator, multimeter and sinwave generator.

obviously this isn't ideal, but i did a lab sub and two hd15's under the same conditions to gain some kind of comparison. all have a notch at 70hz and 125hz which would suggest some kind of measurement/room error. All were standing up with the db meter 1m away, 60cm off the floor

i kept the input voltage reading on the multimeter constant  at 2v for the usb, 1.9v for the lab and 1.41v for the hd's (4ohm pd158 loaded in parallel)




I made it so the front area dimentions match the lab. They do go low enough to be used on their own, but this way the labs can provide extra sub weight AND these dimentions fit my tops AND fit well in vans/trucks. they sounded pretty good all the way up to 180hz so can be used as kick bins.

They are loaded with two 18" 600w Celestion Frontlines. Reverse firing through the magnets. They can be built using exactly 2 sheets of 8x4 too!

[Gareth James]

Looks good Dave, very reminiscent of Funktion 1's F218 (think its that model anyway!)

Like the idea of loading from magnet side, the extra cooling from fresh air can't hurt...

[David Trotter]

my measured response did not match the hornresp model with much accuracy, so i'm dubious about it. It predicted a 5db peak at 110hz with the 1000w frontline, which was not there when i tested it (ears confirmed this).

Despite this, i've modeled a large range of drivers. Pd184's, Fane collosus 600B's, eminence magnum LF, B&C ps100, p-audio challenger 18lf all work well.

The best thing about the celestions however, is the minimal basket and the 3" wide vent means they are more ideal than others for reverse firing.

[David Trotter]

Hey guys, plans are up!

http://www.dissident-faction.co.uk/usbproject.htm

[tino cinotti]

Cool, looks pretty similar to es18bph design published by staiper in 2004 but in double version: http://groups.msn.com/SpeakerBuildingpics/shoebox.msnw?actio n=ShowPhoto&PhotoID=19.

[Jon McDowell]

I agree with Tino - I just finished an ES18 last night. I have both a P-Audio SD18 and a P-18N to try in it. I'm also building an X1 by Rog Mogale and intend on comparing all combinations of speakers and cabinets using Smaart and my own ears. Use will be drum fill sub and possibly "C" rig subs.

[Andy Sheales]

Gareth James wrote on Fri, 07 April 2006 15:15

Looks good Dave, very reminiscent of Funktion 1's F218 (think its that model anyway!)

is does indeed
stick some wheels on that beast, paint it purple and away you go, tho it does look a might chunkier