In Reply to: Insulation for 620a style box for my Altec 416's? THANKS DAVID YOST and KLOSS (Live And Learn) posted by chopper87@aol.com on August 9, 2012 at 18:13:24:
The earliest 620 cabinet I ever saw had nothing on the walls, only a rigid piece of mineral board installed at an angle.
See the angled thing from top to bottom at at http://www.dayton-wright.com/ZZZ-altec620.jpg
That is stiff mineral wool board as is used to insulate fireplaces.
here's a pic of my 618 cab insulated that way
http://www.audioasylum.com/forums/critics/messages/6/64018.html
Slightly later versions had a little bit of mineral wool or cotton batting stapled to the sides.
See http://soundup.ru/images/stories/archive/Classic/Columns/altec-620-speaker-cabinet-original-condition/altec-620-speaker-cabinet-original-condition-7.jpg
I'd say less is better with Altecs. you can either start with a lot and remove a bit at a time until you get there or start witn none and add until you get there.
------------------------------
Whereof one cannot speak, thereof one must remain silent -- Wittgenstein
Free your mind and your ass will follow -- Parliament/Funkadelic
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Less is more? Or at least more historically correct... - Joe Roberts 17:00:34 08/10/12 (5)
- RE: Less is more? Or at least more historically correct... - uncle mag 17:01:46 08/11/12 (2)
- RE: Less is more? Or at least more historically correct... - Joe Roberts 17:48:14 08/11/12 (1)
- RE: Less is more? Or at least more historically correct... - uncle mag 16:21:30 08/12/12 (0)
- RE: Less is more? Or at least more historically correct... - chopper87@aol.com 18:33:06 08/10/12 (1)
- RE: Less is more? Or at least more historically correct... - Joe Roberts 19:46:36 08/10/12 (0)