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how do Audio Artistry and Energy get around this problem? They use active EQ's..... (nt)

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Thorsten

In Reply to: Re: Help Constructing Dipole Speaker posted by ccd on July 05, 1999 at 18:09:58:

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Which means a driver with Qms above 7, and a large value cap in series.(nt) Clayton Oxendine 08:38:08 7/06/99 (3)
...
- Nope, certainly not AA and neither Gradient or Celestion do it this way.... Thorsten 08:50:45 7/06/99 (2)
  Hi again,
  Quite a few of the Open Baffle Systems I know (Celestion 6000 Sub, Gradient Sub for Quad ESL63, Audio Artistry, Legacy Whisper) utilise active Equalisation before the Poweramp.
  Others like the Gradient Revolution and a DIY Project from Klang + Ton (Germany) use passive Equalisation with very large value Inductors.
  The same is true for a Italian DIY Project based on Siare Drivers (now part of Audax) and I suspect that the Triangle Open Pannel also uses some passive equalisation....
  Indeed, the only Designer I'm aware of who exploited commercially the use of High-Q Woofers was Bob Carver. But quite frankly, if you use a High-Q Woofer all this implies is a strong Resonance at the Open-Air Resonance Point. At this point as a result there will be severe lack of mechanical and electrical damping causing ringing (or Boom)....
  Later Thorsten
  - Re: Nope, certainly not AA and neither Gradient or Celestion do it this way.... Clayton Oxendine 12:20:35 7/06/99 (1)
    I am not familiar with the AA, Gradient, or Celestion. I should have not implied that these take the cheap way out. Actually, active EQ done right can really help by extending the low end a full octave lower. Your statement about a Hi-Q driver is not necessarily true. For one reason, a Hi-Q woofer is not going to be boomy without being in a box. It is the box that adds the boom. Also, even in a box, this can be overcome. I have the Dynaudio 17W75ext which has a Qts of .85. I have three of them in a 4 cu.ft. box fully and tightly stuffed and the box Q is .66, which was brought down because of the stuffing lowering Qms. It was not boomy when I had it mounted on a test baffle. It is one of the better mid-woofers for upper mids that I have ever heard. The lower end sounds very tight. It will take a Hi-Q woofer for what this guy wants and some EQ to boot.
    Clayton
    - Re: Nope, certainly not AA and neither Gradient or Celestion do it this way.... Frank Habrle 16:56:09 7/08/99 (0)
      Dipole "cancellation" at 6 db/octave occurs. Start frequency depends on baffle dimensions. Reason why high Q drivers are often (but not always) used in dipole designs to help balance out dipole roll-off.
      Generally you will need twice as many drivers (as normal design) to compensate, mostly of the high excursion variety. Most dipole designs use active EQ to achieve flat low frequency response.
      The lack of box resonances plus favourable room interactions make for the most natural dynamic and detailed bass I have heard from any stereo system. The Audio Artistry designs are excellent, but I have heard some dipole designs that have 6 high excursion drivers per side - just great when well implemented.
      I would suggest dipole DIY is definitely for the experienced builder with excellent measuring equipment and capability of matching the EQ requirements.

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