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In Reply to: Anyone have info on sunlight engineering se 308 coaxail 18in? posted by Kloss on February 1, 2007 at 15:56:07:
There was a guy in Rome, GA who had a pair for sale several years ago...I can't remember his name, but he owned a small manufacturing business in that town and also was a historical musician--the Civil War being his specialty--if this will help you track him down. His were the very ones owned by Harvey Rosenberg and the subject of his enthusiastic article on the Triode Guild webwite. I was interested in them, but we never made a deal. IIRC, they had a very high Qts so needed a version of an open baffle to work properly. Supposedly, Harvey had them mounted on a pair of solid oak doors. They were beautifully made and, with the correct crossover, would probably have been great performers. Said to be 100dB+ efficient from 30Hz up.They used either a JBL 375 or a copy thereof, so I guess whatever crossover appropriate for this driver to blend with the beaming of an 18" woofer...perhaps 750-800 Hz with asymmetrical slopes a'la Tannoy dual concentric practice.
Follow Ups:
Thanks David,Looks like I will be trading for gizmos pair wish me luck .Gizmo said horns best but Iam torn between massive BLH or OB design.
Hi Kloss,Are you talking to Jerry about these? If so, tell him I said hello.
I think that a horn or BR of any stripe would be among the last choices for these woofers (with all due respect to the late HR)...you will need to have them measured, of course, but I think you will end up with either a true open baffle, IB (which will have a bass response hump), or some variant like an open backed box. When I talked to Jerry about them years ago, we thought that a scaled up Onken might work, but I have since learned more about how T/S parameters determine enclosure type, and think that this or any other phase inverting box wouldn't be appropriate.
Good luck with your trade, and if you get them, please let us all know how you end up using them.
Jerry agreed Iam trading 3 hieff ribbon loudspeakers for the se308s.I have drawn up plans for a OB design. Will measure at madisound to see which design is best my massive BLH ,upsized Autograph,or OB.Thank you for your time and help. When finished will post a picture since these are for my own use and collection not for sale should be allowed to post a pic.
Cool.What ribbons did you trade, if I may ask? Not too many HE ribbons out there.
Good luck with the SEs, I'm sure they will be spectacular once sorted out. BTW, I just remembered Gizmo turned me on to a web site belonging to a German kid who had worked out the crossover and box to the satisfaction of a few Western Electric loudspeaker nuts. Claimed to be the ultimate. Sorry, but I couldn't find the address.
Iam trading 3 loudspeakers using hi-vi rt8 2,AMT style ribbon with fostex fw305 12in woofers in large bottom ported BR designs with double baltic birch cabs 1 1/2in T.Maybe not exactly hi-eff at 96db 4 ohms but sure play great on my low power kit.I also use ravens,mundorfs, founteks inc neo pro 5i, that ribbons truly hi-eff at 102db can run as low as 1200hz.
Sounds like you got the better part of the deal, although I'm sure the Fostex/AMT/ribbons sound nice.
Retails $2600 pair frieghts near $500 plus the 3rd speaker Jerry did some hard bargaining.I use massive hovland caps WBT crimp conectors solder, all veneer is a french polished finish, deflex, wool, cork, damping, ribbon mounts are solid 1in cherry.
what's its measured parameters? - 18" if Qt and fs are low can be fun in Karlson. P-Audio had 18" coaxial on sale for $250ea couple years ago
Freddy one of these days I will build a pair;) But not with the se308.
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