I have been completely rebuilding a pair of DBX234XL crossovers.
I swapped all the TL074 types for OPA1644, & LM353 for OPA1642 dual - all worked very well in that position.
The output opamp drivers were more hassle - replacing NE5532 using a mix of OPA828 for the high end/ upper mid, OPA2134 for the bass and Burson v7 Vivid discrete for the sub.
I had to make up some custom boards (white/ gold) for the OPA828's with the heat transfer pads, and a transfer plate for the 1644 SMD taking it back down to fit the 14 pin sockets.
Caps were changed to WIMA FKP and the decouple caps to Nichicon UKZ.
Next stage is to connect up the external dual R-core PSU and finish tying down some grounding.
Quite a story all told, but sounds really good driving my modified Alcons Pro-ribbon PA system.
I swapped all the TL074 types for OPA1644, & LM353 for OPA1642 dual - all worked very well in that position.
The output opamp drivers were more hassle - replacing NE5532 using a mix of OPA828 for the high end/ upper mid, OPA2134 for the bass and Burson v7 Vivid discrete for the sub.
I had to make up some custom boards (white/ gold) for the OPA828's with the heat transfer pads, and a transfer plate for the 1644 SMD taking it back down to fit the 14 pin sockets.
Caps were changed to WIMA FKP and the decouple caps to Nichicon UKZ.
Next stage is to connect up the external dual R-core PSU and finish tying down some grounding.
Quite a story all told, but sounds really good driving my modified Alcons Pro-ribbon PA system.
