I have a pair of these drivers that have been in use in Nelson Pass's TL speaker box designed for the driver. It's quite nice. But the drivers both need refoaming. I've done this on several drivers in the past so not too worried about the job. But the original foam was applied to the back side of the cone. Just how important do you think it is to apply the replacement to the backside of the cone? I can't see that it would make any real difference, though there would be a lip of the foam where it joins the cone. Again, hard for me to believe that would matter a lot. I'd imagine getting the foam OFF of the back would be more important relative to mass.
Anyway, I'd be interested in any thoughts you all have. Thank you!
Anyway, I'd be interested in any thoughts you all have. Thank you!
Well, up to the driver's VC diameter it's pistonic, so in theory whatever WLs are out in the foam's overlap will be slightly 'soft', though no clue if audible. Above it is the driver's TL modes that travel in/on the diaphragm and any that make it to the rim on its surface will again in theory be 'softly' clipped in its HF.
Regardless, I have several pairs with just puddled dust for surrounds, so if I ever get to re-foam them it will be on top unless anyone comes back with a resounding 'don't!' by then.
Regardless, I have several pairs with just puddled dust for surrounds, so if I ever get to re-foam them it will be on top unless anyone comes back with a resounding 'don't!' by then.
If the driver was carefully designed to ensure a symmetrical displacement of cone versus coil current in forward and backward directions, then assembling the surround on the wrong side of the cone may slightly degrade the current / displacement curve. In a worst case scenario the travel may be prematurely limited in one direction, although this would only occur when driven outside of its linear operating range anyway.