High Efficiency Speaker Asylum

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RE: Mass Loading ALTEC A7 VOTT 825 enclosures

Posted by Rafaro on February 18, 2016 at 12:17:54:
About 600 lbs combined weight.....good luck moving it and keeping structure together! The problem with the Altec 825 is inadequate deep bass and poor greater than 10KHzs HF response. Once upon a time had a surround home system with five 825 cabs modified with 3/4" Plywood Oak veneer. The horn was reinforced and closed off from the bass reflex below. The bass reflex cab was then reinforced and an JBL 18" placed in as a subwoofer. A JBL horn supertweet was added and the system biamped. This gave 20Hz to 20Khz response and rivaled for pennies the $100K (at the time) Wilson WHAMM....actually won the bet ($1K) with the store owner that I could match the WHAMM "inexpensively". Highly recommend these mods but nowdays would place either a Danley tapped horn or a BillFitzMaurice subhorn in that bass reflex space instead of a direct radiator.

Best