Subwoofer for hight efficiency speaker, Altec 604 or VOT

Fostex FW800HS

800mm cone.

!!!

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The American version of 6L6s Japanese Altec / Fostex System

2 x 21 inch powered subs - crossed over at 60hz

Mains are old school JBL professional with passive X over JBL 2241 x 2 , 2202 mid, 2441/2395 lens, 2405 in mid cabinet,
Passive X over from JBL 4350 - there 2 pair of these in our 1400 sq foot shop - As Borat would say “ nice, very nice”
 

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JBL Cinema subs like the 4642A are a very good match for Altec and old JBL speakers, they fit like a glove to that. But i'm sure other subwoofer with big cones probally are also good. Just use big cones (+15") and make sure they can keep up with the mains.
 
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