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Upgrading the CABRE AS45 active crossover

Posted by KanedaK (A) on October 13, 2016 at 06:02:48

I'm using an old CABRE AS45 two way active crossover.

It uses (i'm quoting the booklet) "1% high precision metal film resistors, high stability and great precision 2% capacitors, j-fet input opamps with high slew-rate and low noise"

It does, however, bring a certain roughness to the treble, some kind of "dirtyness" that's very obvious on compression drivers.

It sounds a bit like my REVOX B226 did before I recapped it and swapped the old opamps for LM4562.

The "magical" recipe on the B226 was: Nichicon KW caps in the PSU, Elna Silmic II everywhere else, LM4562 in gold-plated sockets with local decoupling added close to the legs (replacing NE5532).

These small mods really made a night and day difference!

Checking the guts of the CABRE AS45 I can already see that:

- the lytics are nothing special (Nippon Chemicon SM series) and might be old (I bought this device second-hand and while they still produce it, it dates from the eighties);

- the opamps are TL082

I guess a recap with Elna Silmic II or Nichicon Muse cannot hurt anything, but would I get improvements by changing the four TL082 for LM4562? My intuition says yes, but desoldering opamps and installing sockets + possibly local decoupling isn't as straightforward as changing a few caps.

Anybody has any opinion regarding the TL082 opamp?

Edits: 10/13/16 10/13/16

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