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From: Arfa Daily on 28 Jul 2010 20:28 "Ron" <ron(a)lunevalleyaudio.com> wrote in message news:54KdnVpXyYEKHc3RnZ2dnUVZ7qKdnZ2d(a)bt.com... > On 28/07/2010 17:50, Arfa Daily wrote: >> >> >>> >>>> Didn't Phillips do something like this back in the 70's? Motion >>>> feedback >>>> or some such daft name? >>> >>> I think they called it 'David', it was a motion feedback woofer in a >>> powered-speaker >>> form factor. This kind of system can control the low frequency >>> behavior >>> of the cone very accurately. Mossbauer apparatus uses the same >>> hardware for motion control with < .01% distortion, but that's a >>> linear-motion >>> measurement, no idea what the air movement effectiveness is. >>> >> >> OK, both. Don't remember the Philips system, but then the company that I >> was working for back then, didn't do much with Philips. Still, that >> sounds like the sort of system. Those specs for the Mossbauer are >> impressive. I guess that's the sort of thing that it's going to be, >> given the claimed value of these things. I've just been listening to a >> CD through them. They sound nice, and very smooth with a very flat and >> stiff sounding bass. Quite easy on the old lug-holes, but I'm not sure >> that I would rate them as 16 grand more easy than my home-built EMI 13 x >> 8 cabs from the 70's ... :-) >> >> >> Arfa > > Ahh 13 x 8's did they have the whizzer cone in the centre? > > -- Some of the 13 x 8s did have, and I seem to recall that some also had a bracket fixed across the centre, which held a pair of black Mylar-coned tweeters. The 13 x 8s that I used were the 'straight' bass version. I built 3 ways with them, using the matching EMI 8 x 5s for the mids, and they did indeed (still do) have a whizzer cone in the middle. The mids are separately baffled by their own sub-enclosure behind them, and inside the volume of the bass cabs. The tweeters are Eagle aluminium domes. Very bright sound. I picked them because I loved the clarity that they added to the top end of the sorts of music that I was listening to back then - mainly heavy and progressive rock. The crossovers are also Eagle. They used to make some good products. I guess they don't exist any more. :-( Arfa
From: Archon on 28 Jul 2010 23:02 On 7/28/2010 8:28 PM, Arfa Daily wrote: > Some of the 13 x 8s did have, and I seem to recall that some also had a > bracket fixed across the centre, which held a pair of black Mylar-coned > tweeters. The 13 x 8s that I used were the 'straight' bass version. I > built 3 ways with them, using the matching EMI 8 x 5s for the mids, and > they did indeed (still do) have a whizzer cone in the middle. The mids > are separately baffled by their own sub-enclosure behind them, and > inside the volume of the bass cabs. The tweeters are Eagle aluminium > domes. Very bright sound. I picked them because I loved the clarity that > they added to the top end of the sorts of music that I was listening to > back then - mainly heavy and progressive rock. The crossovers are also > Eagle. They used to make some good products. I guess they don't exist > any more. :-( > > Arfa Should have built the , Kef B139, B110, T27's, built them in 1976, still using them, still sound awesome! JC
From: Archon on 28 Jul 2010 23:03 On 7/28/2010 11:02 PM, Archon wrote: > On 7/28/2010 8:28 PM, Arfa Daily wrote: > >> Some of the 13 x 8s did have, and I seem to recall that some also had a >> bracket fixed across the centre, which held a pair of black Mylar-coned >> tweeters. The 13 x 8s that I used were the 'straight' bass version. I >> built 3 ways with them, using the matching EMI 8 x 5s for the mids, and >> they did indeed (still do) have a whizzer cone in the middle. The mids >> are separately baffled by their own sub-enclosure behind them, and >> inside the volume of the bass cabs. The tweeters are Eagle aluminium >> domes. Very bright sound. I picked them because I loved the clarity that >> they added to the top end of the sorts of music that I was listening to >> back then - mainly heavy and progressive rock. The crossovers are also >> Eagle. They used to make some good products. I guess they don't exist >> any more. :-( >> >> Arfa > > Should have built the HiFi Answers Transmission line speakers, Kef B139, B110, T27's, built them in 1976, still > using them, still sound awesome! > JC
From: Arfa Daily on 29 Jul 2010 04:23 "Archon" <Chipbee40_SpamNo(a)yahoo.com> wrote in message news:_a64o.495695$Jq1.238322(a)en-nntp-05.dc1.easynews.com... > On 7/28/2010 8:28 PM, Arfa Daily wrote: > >> Some of the 13 x 8s did have, and I seem to recall that some also had a >> bracket fixed across the centre, which held a pair of black Mylar-coned >> tweeters. The 13 x 8s that I used were the 'straight' bass version. I >> built 3 ways with them, using the matching EMI 8 x 5s for the mids, and >> they did indeed (still do) have a whizzer cone in the middle. The mids >> are separately baffled by their own sub-enclosure behind them, and >> inside the volume of the bass cabs. The tweeters are Eagle aluminium >> domes. Very bright sound. I picked them because I loved the clarity that >> they added to the top end of the sorts of music that I was listening to >> back then - mainly heavy and progressive rock. The crossovers are also >> Eagle. They used to make some good products. I guess they don't exist >> any more. :-( >> >> Arfa > > Should have built the , Kef B139, B110, T27's, built them in 1976, still > using them, still sound awesome! > JC Friend of mine has just built some ! He bought all the drivers way back then, and has had them 'stored' ever since from lack of finance, skill, and will. Then, last year, he decided to build them, so had a local joinery place cut all of the boards for him. The job still took him the better part of a year, but he finally finished them, and was then extremely disappointed with the sound. However, he persevered with them, and eventually found that they were extremely critical of their positioning in the room, and performed loads better, when elevated from the floor. He now alternates between his Quad electrostatics, and the Kefs, depending on what he is listening to. Arfa
From: Ron on 29 Jul 2010 04:32
On 28/07/2010 21:16, David Nebenzahl wrote: > On 7/28/2010 12:10 PM Ron spake thus: > >> On 28/07/2010 17:50, Arfa Daily wrote: >> >>> I've just been listening to a CD through them. They sound nice, and >>> very smooth with a very flat and stiff sounding bass. Quite easy on >>> the old lug-holes, but I'm not sure that I would rate them as 16 >>> grand more easy than my home-built EMI 13 x 8 cabs from the 70's >>> ... :-) >> >> Ahh 13 x 8's did they have the whizzer cone in the centre? > > Whizzer cones? Are you pulling our legs? > > I always associated whizzer cones with the know-nothing, 6x9 oval weird > expensive speakers to throw in the back of your car market, not anything > near audiophool quality. Am I wrong? > > Well, these were 13 x 8 " elipticals, often used in PA columns back in the 60's tho they were still around well into the 70'. I don't think EMI ever claimed that they were 'hifi' However, you still see whizzers on modern speakers, Eminence still make them. I was interested to see a speaker with a 'dual cone' in a modern Mark Bass combo only yesterday. Ron(UK) -- I am using the free version of SPAMfighter. We are a community of 7 million users fighting spam. SPAMfighter has removed 1589 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message |