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RE: 3.6R crossover mods

23.242.178.78

In Reply to: RE: 3.6R crossover mods posted by watts on December 30, 2022 at 04:56:07

I bought a couple of pairs of hand matched Jantzen Superior Z's from HHHF for a pair of my Maggies. He was very professional and prompt with the cross-pond shipment. All measured spot on.
Also have a hand matched set of Mundorf MCap Supreme Silver Oils for the ribbons that I got with a store credit (customs had totally trashed an order shipment) from PartsConnexxion. Customs must have never seen electronic components before.

I wanted to try the Jupiter Copper Paper & Wax but PartsConnexion was out of the size I wanted (as well as many other suppliers).
Since then, Miflex coppers have become a popular cap, but they are huge.
This DIY amp build with Duelunds looks spendy as well as the shiny Torody:

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2022/03/30 Historical Records CENSORED

Edits: 12/30/22 12/30/22 12/30/22

Follow Ups:

RE: 3.6R crossover mods - watts 09:55:49 12/30/22 (1)
Which maggies? Did you do any tweaking, or just stock values? Or point me to a post if there was one I missed; which is quite likely as I go many months without checking any audio forums.

If my amps looked like that I would not put a cover on it :)
- RE: 3.6R crossover mods - emailtim 10:31:04 12/30/22 (0)
  I replaced the stock internal caps of my 20.1's with same values, then went full active with custom digital XO's (much faster to experiment/test than with physical caps and coils) and then applied the Saitie/Josh/... Tympani NEO8 midrange mods to the 20.1's.
  I am now only using the Mundorfs as ribbon protection caps.
  I am using RePhase to make the XO's and CamillaDSP as the realtime convolution engine. I modified one of the CamillaDSP accessories written by another gentlemen so I can very quickly switch between different XO's, house curves, filters, etc.
  All processing is done in 64-bit float (XO, filters, playback chain, convolution engine) before outputting to the DAC.
  Also spent time updating the DRC-FIR package to work at the driver level versus the speaker level. DRC-FIR was written in the 90's when digital XO's wasn't very prevalent. Since it works at the speaker level, it can't really fix individual driver issues in the XO region between the adjacent drivers. It can only average the sum.
  Example, if driver A is spot on and driver B is off in one manner, it tries to correct both over the XO region thus making A worse and B somewhat better.
  Correcting at the driver level, it doesn't touch A and only corrects B.
  In general, the upgrades only corrects A as is needed by A and only corrects B as is needed by B.
  Also adding other functions over time such as being able to specify target curves with FIRs versus some hand enter points, combining FIRs, changing the number of taps in a FIR, etc. That has been a learning curve for me.
  
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  2022/03/30 Historical Records CENSORED
  
  Edits: 12/30/22 12/30/22

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