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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Push-pull woofers posted by Wayne Parham on May 18, 2003 at 13:04:37:
EAW makes a lot of nice stuff.At one time they were the sole OEM source for RCF in the USA. At one time I was on a scheduled release program and getting 250pc price breaks. N280 and N480 compression drivers. The N480 diaphragm fits 1" JBL structures(2410/2420/etc), sounds better, costs less, and is more rugged.
"I wonder why these models were discontinued."
KEF was sold in 1992, floundering even before the death of Raymond Cooke(1996), I can't remember what year Laurie Fincham left. Here is a description of their push-pull 4th order bandpass design:
The Dual Cavity Woofer System
Model 103/4 incorporates two 160mm woofers mounted in double coupled cavity configuration and linked with a force cancelling rod. This metal rod couples and thereby cancels the drive unit’s identical, but opposing, mechanical vibrations, whilst reducing distortion. Linking the woofers also prevents the transfer of energy to the main enclosure, a cause of the delayed resonances which often give rise the ‘boxy’ colouration thus reducing musical clarity. Model 103/4’s entire bass output is radiated by a smoothly contoured duct placed below the Uni-Q unit. This acts as an air diaphragm of very low mass, with an effective diameter similar to that of the midrange unit. Thus directional characteristics match, ensuring exceptionally smooth acoustic integration throughout the entire frequency range.http://www.kef.com/kefimages/image240.gif
(in case the image doesn't load)
The 103/104/105 used dual 6.5/8/10 woofers. All were a 50hz~150hz BP4 and with the KUBE had a Q=.5 20hz cut-off. The 107 had dual 10s, a bigger box, less effficent, and would do 20hz without the KUBE. The 105/107 had the MF/HF in pods atop the woofer cabinet, ala the B&W 801. The version of the 103 that only had one 6.5" mid sounded really good, but wouldn't handle enough power to get good 'n loud. The 104 almost got loud enough, but sounded funny in the MF. The 105/107 were too expensive(in 1988 a pair of 103s were about USD$1800
depending on finish, I think the 107s could get up to 10K$)A friend of mine, Bruce Knight, went to work with dB Sound in the early 80s. Bruce told me about these four 18" driver manifold boxes that had as much low end as their much bigger four 15" horn boxes.
• Manifold Technology •At the heart of these systems are the world renowned Electro-Voice“MT†enclosures. The “Manifold Technology†enclosures were co-developed by EV and db Sound to combine all of the sonic and cost advantages of reducing system size.
http://www.dbsound.com/images/MTStkLgo.jpg
Here's Bruce's small convex arrayed system for Aerosmith:
http://www.dbsound.com/images/Aeropic1.jpg
When Bruce did our hometown with Aerosmith he brought the 80,000 seat stadium rig into our 10,000 seat auditorium. Jackal opened up with their 'Chain Saw Boogie', I've run jackhammers that were quieter and had less impact that their mic'd chainsaw. I couldn't handle it, even with plugs.
The typical stadium system consists of 54, EV MTH4, Mid/Hi enclosures, 54, MTL4, Lo enclosures, and 16, MT2, Hi and Lo enclosures(a total of 248, 18" woofers). 56 Crest 8001 amplifiers are utilized to provide the system with 168,000 watts of power.
I told Bruce it was stupid to run a convex array, and that trap cabinets ought to face in, not out. He said it would be an all day afair to rig the fly-bars, but he would try it when he had an extra day to set up the gig.
"db Sound has taken the development of the MT system one step further with the introduction of the unique Concave Line Array. By arranging the enclosures in 40° opposing angles to one another all lobbing is eliminated horizontally. This results in 180° of side to side coverage without the “dead†or “hot spots†that are normally experienced with other systems.
The system effortlessly produced levels of 126db at the mix site as well as 110db, 450 feet from the stage, with no delay towers. Implementing a combination of proven acoustical principals, the Concave Line Array is virtually unrivaled anywhere in the world.
The system was critically acclaimed by the press as “the best outdoor sound system ever heardâ€."
http://www.dbsound.com/images/CLACntr.jpg
A a 1,200 seat club gig the MTL2 rig was being loaded out and I was waiting to load in (you can move the MTL2 without a forklift and get them up a fire escape without killing yourself). I suggested we grab some breakfast and let the stage hands do all the hard work, and afterwards he could hear what a 'real' system sounded like....TBC
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- EAW - djk 05/18/0321:12:27 05/18/03 (0)
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