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Dear friend of mine picked up a pair of Response 3. A charismatic speaker he remembers from the pre-diy years of shopping in a thing of a past, high end audio store.
We decided to reinforce the cabinets internally as they are just hollow un-braced boxes with some provision for sand in the base.
Woofers were rebuild by Meniscus and Dave rebuild ScanSpeak D2905 tweeters with new coils.
We are also replacing yellow packing foam ProAc used with some mineral fiber. Will measure and post as the process is going.
I will design a new crossover and perform a listening session after. Usually NY DIY rolls with blind listening.