D.M. Procida wrote:

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I don't follow why I'd need grille cloth as well as foam (originally,
there was just the foam).

They look like
http://www.audiocostruzioni.com/r_s/diffusori/diffusori-5/royd-audio-conistor/constriction%20r.jpg.


** You cannot use flat foam rectangles for that speaker, as the woofer is mounted on the surface of the baffle and there HAS to be a few mm clearance in front of the cone/surround to allow for movement.

The originals must have been sculptured to prevent cone strike.


...... Phil