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In Reply to: RE: Bass panels one after the other? posted by JLindborg on June 22, 2014 at 01:34:50
No no no, that idea of joining two panels was already rejected. So now I'm thinking if two 2.x (or such) panels would give any benefit when positioned side by side, maybe on a one stiff wooden panel? It might not be IVA- like, but could it be even close?
BTW; why couldn't two unequal drivers connected parallel be driven with one amplifier? I think that even IVA- drivers are not quite similar, and for what I have understood, they are often driven with one amp..?
Follow Ups:
Sure You can drive 2 panels with 1 amp! No problem at all!!!
If You are serious with low frequency reproduction with a Magnepan dipole, You have to use panels without tuning buttons.
If You have tuning buttons You will restrict movement at each place a button is placed and thus the whole membrane will NOT move as 1.
1 tuning button will render about 2/3 of usable membrane the rest is downforced by its own mounting at the surround AND the button creating a curved movement. So in practice, to say that the whole of the membrane is usable as bass reproduction is EXTREMELY faulty reasoning as it does NOT move like a piston at all!!!
Only the center of the membrane is close to a piston movement and the rest is a declining function of a curve.
Cheers!
The one who succeeded was the one who didn't know it was impossible.
"If You are serious with low frequency reproduction with a Magnepan dipole, You have to use panels without tuning buttons."
Do you JLindborg (or anyone else here) have any experience on removing those buttons? Would not want to be first one to try, just to see that it destroys the whole driver and it can't be fixed back...
On the other hand; why would Magnepan use those buttons, if removing them would be better? Or does it have something to do with upper frequencies?
Magnepan uses tuning buttons for the very reason they are called just that.
To remove them You will have to ruin the membrane and replace it with a new with specified tension to get the resonance frequency You need.
Cheers!
The one who succeeded was the one who didn't know it was impossible.
Unfortunately, he doesn't understand the trade-off the buttons provide and the result if they were removed.
If the folks at Magnepan were to construct a bass transducer (for one of the buttoned systems) with their normal procedure with the exception of not gluing in the tuning buttons it would yield a drum skin with a large resonant mode at a single frequency. This resonant frequency would be much lower than the existing one(s) and then front/back dipole cancellation effect/distance created by the baffle width would no longer line up to EQ it.
It's simplistic to think you could achieve a superior result just by removing the tuning buttons and leaving all the other design aspects the same. I'm not sure that's what he's advocating, but if it is, it won't work. :)
Hope that makes sense.
Cheers,
Dave.
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