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Celestion restored vintage speakers Studio 66 (also applies to the Ditton 25)
I have built completely new cabinets for my Studio 66's and kept the spec identical to the original 18mm chipboard cabinets. Recapped and made them tri-wireable so tri-ampable (is that a word..). I used only the original foam and no extra damping at all. The speakers were elevated on carb fibre speaker supports by around 10 inches to help sort the bass out. I would never use any extra damping on these out any other Celestion speaker of this vintage.
I can say after months of listening to these mid 1970's speakers the designers back then really knew what they were doing, the timbre on acoustic and percussive music is spot on, they are fast and agile and the cabinets disappear. Celestion had all kinds of options on materials for these flagship speakers but they went for chipboard because it's more lively and transmits energy at a higher frequency. Damping the internals would destroy the life they convey. Marvellous speakers and a joy to live with, my favourite vintage speaker by miles. The bass they produce is uncanny especially on the elevated carbon supports which control the low end punch and make for a very articulate speaker. Top end is sublime and the midrange believable. Happy chap....
https://theartofsound.net/forum/asse...7&d=1681471831