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In Reply to: RE: Coral 4" speaker posted by TroelsM on August 26, 2007 at 13:45:06
In Reply to: RE: Coral 4" speaker posted by cft on October 31, 2008 at 23:42:46
Hi VirginVinyl, great, so you are familiar with these units!
[They look like they are the Series II flat 5's. The very last few hundred of these had paper dustcaps which sounded slightly sweeter and more natural. Not a big difference really.]
Have you heard those with paper and Al? I was thinking of replacing the dented aluminum caps with paper ones. You think that's worthwhile? Or simply lift them back up...
BTW, the seller said these units were manufactured for a Danish dealer (biggest, worldwide for Coral)and they have higher efficiency (~94 dB) and better freq range than the flat 5 [II ?], and their closest relatives are the mk III black frame (he might mean series III). Anyway, waiting for his further reply. Do you know of mk III black frame? Would you think they are similar to series II?
[In the right enclosure and in a room that isn't too big so they 'load' the room you will a very beautiful sound.]
Really? terrific!!
[What enclosures are you planning on putting them in?]
Good question, no answer, any suggestion you may have? will appreciate it very much!!
CFT
Follow Ups:
Hi again,
Ive seen 4 different versions of the Coral flat 5.
The series 1 with a alnico magnet. Sounded very aggressive, due i have been told to the surround which was changed in the series 2.
Unfortunately the series II lost the alnico magnet but gained a surround which better damped the cone resonance. The series one was an ok driver, the 2 a magical one.
The paper dustcap drivers i have had and still do own. They are a little sweeter than the aluminium dustcap drivers. Not a huge difference but so easy and cheap to do. You will like the result.
Enclosures. The wrong enclosure will kill these drivers dead.
Ive heard them in 3 enclosures that i liked (and quite a few i didn't).
No one best and they all sound very different.
Concrete spheres made by Michael Brown outside of Canberra, Australia. He called them the audiospheres and they sound lovely. Quite electrostatic like (clean and clear). They were on short stands placing the spheres quite close to the floor which they needed for proper bass loading (otherwise they were just too lean and clean, robbing music of timber and foundation). Least boxy sounding box solution ive heard them in.
Small front ported wooden enclosure. Chipboard not mdf. Richer and fuller timbers than the audiospheres. A more weighty 'meaty' presentation. Also more corse, boxy and resonant. No clear pure electrostatic sound here but with its own charms.
Rear horn. Around i guess a metre tall. About 7 inches wide and maybe 60 cm deep. This enclosure sounded great but very different to the other two above. Lots of slam. A large sound. Direct, vivid. Maybe too direct and vivid. Suited some music much better than others. Great for Jazz, which is not really my thing. Also worked pretty well on blues and lovely on female vocal. Could be used in a larger room also due to the driver not working very hard. Along with the sphere above, the most ruthless implementation. By that i mean that your electronics and system better be up to scratch and tailored to complement the speakers or you'll hear it.
The flat 5 II's are the sorts of drivers you have to work with for a while to coax the best sound out of them. When you get them right they are wonderful. I much prefer what im listening too now but you will really love them.
See
http://www.audioasylum.com/cgi/t.mpl?f=hug&m=137419
WarmestTimbo in Oz
The Skyptical Mensurer and Audio ScroungerAnd gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
http://www.theanalogdept.com/tim_bailey.htm
The spheres had two fathers - Michael Brown and David Jones, apart from Olson on wave-launch, they did not know that curved surfaces have very low bending modes as well.
Eg, a sphere made of different radius rings of MDF, clamp-glued and then turned smooth, would be a lot lighter than concrete, and faster. And very probably quieter than Celestions 600 and 700 boxes. I've heard both models and despite disappearing they till sounded like boxes.
IME for the Flat 5 the box enclosures threw away just about everything the spheres got right, and got in the way of much of what the Flat5's get right.
Floor loading does help with the baffle diffraction step (BDS), but adds early reflections in front of the enclosure.
The model 2's # (Coral Fl5), and M3 * (the Fostex 2-way), and M4 #(2 x Coral Fl5) all had BDStep issues. *No LP filter/ # no filters. I've always wondered what an M4 would sound-like if the second 5 was only fully effective from their -3db BDS point and on down IE as a 1.5 way design, ;-)!
Near to wall mounting on adjustable articulated arms strikes me as likely to keep most of the sphere 2's launch right, and give some broadband bass boost. I used to run my LTLoan pair in the bedroom on tall stands about 2.5feet out. Articulated? Hard to wall for when you're not listening closely, and out for close attention sessions. But they still can't/don't do bass. More than half the 5's I find are burnt out, by people trying to MAKE them do bass.
IMO the best way to use a pr of 5's in sphere2's is from no lower than 150 and all the way on up. The lower down the steeper the high-pass needs to be. Just like with single pairs of 57's - ;-). As the link, in the post above, sets out.
Did you ever find a fill-in / 'super' tweeter to go with the 5's that was worth the trouble? I've heard the Foster/x RPT in that role (the one with the round mounting plate) but thought it needed a small wooden sphere - ;-) as it was audible and placeable. I'm thinking of that small 16?mm Dayton?!
What is your opinion of pole-piece extensions - misnamed phase-plugs - for a pr of metal dust-cap Flat 5's? IE remove the dust caps and put a turned 'bullet' on the central magnet pole?!
JBTW David J taught me how to set-up sprungies, and I now have their Linn jig!
http://www.theanalogdept.com/susp_tim_bailey.htm
TIA
WarmestTimbo in Oz
The Skyptical Mensurer and Audio ScroungerAnd gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
http://www.theanalogdept.com/tim_bailey.htm
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