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What type of plywood material did AR use to construct these speakers with ? Can it be purchased today ? Was there a particular reason why the better AR speakers featured cabinets made of plywood as opposed to fiberboard ? This question is probably suited to former AR employees or speaker builders . Any factual info will be appreciated .Thanks !
Follow Ups:
may I suggest you try adding layers of 3mm MDF inside, at a minimum 2 layers.Use heavy weights (sandbags or concrete blocks) to squeeze the panels together, and then to glue them to the inner walls of the box. Then add bitumen panels glued and pinned. These panel-pins (tiny nails) should go through all the layers and into the main box wall.
NB Far thicker and stiffer - laminates - should be used for the front and back baffles.
Also consider adding (MDF with cut outs or timber) cross bracing and timber vertical bracing strips.
some NB's
Add up the volume lost by these panels and braces, and compensate in the built volume. A slightly larger final box size at the end will NOT matter with a sealed alignment, anyway. And, you can always glue a couple of roofing tiles to the bottom panel.
In all cases use thin layers of water-base contact cement - these don't outgas and damge driver supensions and surrounds.
Take the opportunity to round the front baffles edges and to rebate all drivers, consider smoothing over any bolts and screws, too.
WarmestTimbo in Oz
The Skyptical Mensurer and Audio ScroungerAnd gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
Actually it would not be fibreboard but particle board. Particle board was not as dense or strong as plywood or pure wood for cabinets so cabinets for most speakers except the cheapy stuff was either plywood or a combination of all wood and plywood. Not sure when mdf came about but do remember that it seemed almost overnight it seemed to replace plywood in almost every box either by way of intorducing a mod to a model uch as an "a" version, a new model or simply a running production change.
My understanding is that early "particle board" wasn't as dense as plywood, but much cheaper. Today's MDF can be both cheaper and DENSER than plywood.If you don't get a good answer here, post this question in the AR forum over on Classic Speakers. and I'll bet you get a good answer there.
--
simul justus et peccator
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