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RE: Modern Magnepan Construction

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In Reply to: RE: Modern Magnepan Construction posted by PaulF70 on April 14, 2024 at 20:02:55

not if the material is clamped well between the 2 portions.

Follow Ups:

Not so .... - andyr 04:46:34 04/23/24 (2)
IMD is an unfortunate issue with most Maggie models. :-((

I had IIIAs for 20 years or so (where the bass panel and the mid panel share the same sheet of mylar and there is a 'clamp bar' running 1/2 along the length between the 2 drivers.

Then I moved to my "Frankenpans" - which had exactly the same sized drivers ... except the mid panel (From a Tympani IVa) was on a separate sheet of mylar to the bass panel (from a 2.6).

This sounded much better.

That's why the Tymp IVa and the T-30 sound much better than the other models.
- RE: Not so .... - UncleMeat 17:56:15 04/24/24 (1)
  I have a question about this. When the Magnepan IIIa drivers were being used did you measure the SPL of the driver directly? I'm wondering if there is a bit of a hole in the output at the crossover frequencies, caused by the 'tuning' of the panel. Seems like it would be very difficult if not impossible to tune the panel so there is no loss of sound output near the (mechanical) crossover point.
  - RE: Easy! .... - andyr 18:35:35 04/24/24 (0)
    You said " When the Magnepan IIIa drivers were being used did you measure the SPL of the driver directly ?"
    
    No, I didn't ... I simply modelled the passive XO and then applied similar filters in my active XO.
    
    " I'm wondering if there is a bit of a hole in the output at the crossover frequencies, caused by the 'tuning' of the panel. Seems like it would be very difficult if not impossible to tune the panel so there is no loss of sound output near the (mechanical) crossover point ."
    
    There may well be such a 'hole' - but if there is ... my belief is that this would be caused by the XO. So no 'tuning' of the panel is required - simply an adjustment of the XO component values to bring the LP & HP 'roll-off points':
    * closer together if there's a 'hole' at the XO frequ
    * or further apart, if there's a 'bump' at the XO frequ.
    
    An REW sweep should tell you whether any 'XO holes' exist.
RE: Modern Magnepan Construction - PaulF70 12:02:58 04/15/24 (0)
I see what you mean now. You're right.

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