About 2 years ago I got a pair of Calipers and restored them. I replaced the inductors with ERSE Air Cores and the caps with Auricaps and the resistors with Mills. Those changes significantly improved the speaker. I would keep them forever, but ...
I now have a set of Duettas (the Calipars are for sale here if you know anyone who wants them). I learned from my first effort and took the crossovers out of the speaker and put them in a separate box. There are lots more components in the Duetta crossover. I found a combination of different caps gave me a better overall sound, using some Auricaps, some original Spragues, some Sinocaps, some Russian PIO's and some Russian teflon bypasses. I also replaced the resistors with Mills.
I decided to put the existing inductors rather than replace them. I used Red insulating laquor available from Allied Electronics. I also braced the cabinet better by installing an aluminum "L" bracket across the back, thereby coupling the interior with the exterior shell much better.
The improvements were phenominal, resulting in a much more transparent and tighter sound while keeping the musicality and imaging that Apogees are known for.
I now have a set of Duettas (the Calipars are for sale here if you know anyone who wants them). I learned from my first effort and took the crossovers out of the speaker and put them in a separate box. There are lots more components in the Duetta crossover. I found a combination of different caps gave me a better overall sound, using some Auricaps, some original Spragues, some Sinocaps, some Russian PIO's and some Russian teflon bypasses. I also replaced the resistors with Mills.
I decided to put the existing inductors rather than replace them. I used Red insulating laquor available from Allied Electronics. I also braced the cabinet better by installing an aluminum "L" bracket across the back, thereby coupling the interior with the exterior shell much better.
The improvements were phenominal, resulting in a much more transparent and tighter sound while keeping the musicality and imaging that Apogees are known for.