No, its not an RL-3...It was an exercise to see if I could build a pyramid shape more than anything else, pretty easy actually.  I believe the one in the picture has a 15" downfiring sub in it.  I have since decided that I like my sub in a third box so it can be placed without regard to where the main speakers are.

We hope to be at Decfest '07, but the Imperials will not.  500 miles in an open pickup truck with no A/C, no CD, and about 12 mpg would be painful.

DanK

As in the standard Imperial, both speakers are open to the horn, and there is a partition in the compression chamber between the speakers.  You can see the Audio Nirvana cone move on some of the louder bass notes, and I'm sure that's from the acoustic energy of the K151 feeding back into the Audio Nirvana side of the compression chamber.  I have not been able to hear anything bad due to this effect, however.

DanK

Valiant wrote on 12/10/07 at 14:11:16:

I'm interested to know how you made your sound evaluation, i.e. where do you place your mike when you are doing a spectrum analysis of the Imperial? Cheers Gaz

Hi Gaz

Nothing real special about mic placement.  I'm limited by my 16x24 shop (with too much stuff in it).  I generally just try and place the mic where I would sit (sweet spot).   I also try to use it only for comparison purposes not absolute, although sometimes its hard to do that (like when you get a really good looking graph).  I'm using WinAudioMLS software (search for WinAudioMLS if interested) that I've been very happy with.

Dan

60_and_up wrote on 12/11/07 at 00:39:36:

i see pro 12ms  8-)

Yes, they are mentioned in the initial post.  A friend who does DJ work is now using 4 of the pro12m's as his mains and swears by them.  He has tried all kinds of stuff in the past and has finally settled in on 4 x pro12m.  Two are loaded with the 12" goldwood pro knockoff available from cheaplights.com for $74, considerably less than the goldwood.  The other two are loaded with a 12" Pioneer musical instrument speaker that I had lying around (Parts Express 290-142).  The 2 sets of 2 different speakers seem to work well togeather.

Dan

weasel2htm wrote on 12/16/07 at 04:47:38:

Just a quick curiosity question, what is he using for subs, if anything.

He usually uses a pair of folded horn Cerwin Vega Earthquake clones with a single 18 each and then a pair of ported boxes that have dual 15's each (I think).  The ported boxes are short throw and the folded hornes are long throw and he's convinced you need both.  Its possible the Imperials could do both, but they are just too darn big and heavy to move around.

Dan