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RE: Thanks too.

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In Reply to: RE: Thanks too. posted by 13th Duke of Wymbourne on November 19, 2024 at 10:57:30

Fair to say the filtering required for dipole compensation can be done several ways. And it's good to be able to select amplifiers based on their design, power, etc.

But one factor in answering the question of drivers is whether the GR drivers are designed in such a way that they perform best with the servo amp, and can't achieve optimal performance without it. Would a non-servo driver be designed quite differently with regard to material, compliance, damping, excursion? If so, could it perform better overall than the GR servo drivers? Or ... what are the tradeoffs?

Maybe HAL2010 can comment on that.
Agilist, Musician, Photographer, Audiophile
Magneplanar: 3.7, CCR, MC1,LRS, MMGW, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-2; Nord: Nord One NC500DM, Nord Three 1ET7040SA; Outlaw: Model 7500; OPPO 205

Follow Ups:

RE: Thanks too. - 13th Duke of Wymbourne 17:43:33 11/23/24 (1)
I am not really a speaker guy but that won't stop me from musing...
Assuming you can get the same frequency response from the closed-loop system as applying equalization to the open-loop system the next thing has to be excursion and distortion. For the same acoustic output and the same cone area the excursions must be the same/very similar. A closed-loop system should have an advantage in overcoming deficiencies in the driver but I don't know how well this one works to reduce distortion. It is monitoring velocity, not displacement and the point of maximum excursion where the cone changes direction produces little/no velocity feedback. So I don't know if it is effective. Someone wiser than me pointed out on this forum years ago that the Rythmik feedback system was developed for sealed subs to overcome the air loading inside the box, which is not a problem for open baffles.

Maybe, then, if you can get the frequency response you want and the excursion you want the rest doesn't matter?
- RE: Thanks too. - MarcL 09:16:38 11/24/24 (0)
  Good points! I think the most benefit is gained by the open baffle dipole design, and the number of drivers which requires less excursion to move a given amount of air.
  
  Hard to do apples:apples with and without servo because you can't use the same amp and shelf filters. Frequency response is the same. In my tests I saw less distortion with the servo ... albeit under 2% down to 20Hz.
  
  But wow do they sound good!
  
  Agilist, Musician, Photographer, Audiophile
  Magneplanar: 3.7, CCR, MC1,LRS, MMGW, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-2; Nord: Nord One NC500DM, Nord Three 1ET7040SA; Outlaw: Model 7500; OPPO 205

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