Speaker crossover mod. Your advice?


I'm considering modding the crossovers of my Focal 1027s. Specifically, I am thinking about replacing the capacitor associated with the tweeter. I have received some helpful advice from another A'gon member who has done a similar mod to his crossovers (on a different model speaker from the same manufacturer).

I would greatly appreciate any suggestions from folks who have experience with this sort of thing. In particular, what sort of improvements can be achieved with this kind of mod? Any thoughts on which caps to use? Any common mistakes I should avoid? Is the whole thing a bad idea?

Thanks for your input.

Bryon
bryoncunningham
Bryon,

I just want to add that I respect Face's experience and would heed his advice.

John
I too wouldn't mix brands of caps between the 2 positions, and I wouldn't use Clarity caps if they were free.

Mundorf SOs are fine. If the caps are too large in diameter to reach the board, use a half-inch-square chunk of wood on the board as a spacer, cap on the wood, 3M foam tape holding all layers together, and a plastic ziptie thru the board.

But I'd still use SoniCap G1s and Platinums. :-)
.
...use a half-inch-square chunk of wood on the board as a spacer, cap on the wood, 3M foam tape holding all layers together, and a plastic ziptie thru the board.

Thanks, Jeffrey. I was thinking of doing something like this.

Last rookie question for you: To create the holes for the zip ties to pass through the board, is it ok to drill through the board with a regular drill bit?

Bryon
You might want to consider an all-new layout with point-2-point and terminal strip wiring.
You should change those nasty iron core inductors, too.....at least for the bass and possibly the midrange.

How many layers of conductor does the board have? IF a single layer on only 1 side, just drill and AVOID any traces. IF conductors on both sides, you'd best be REAL careful.

Did you go to the Humble Hi-Fi site? The site 'owner' DOES mix caps with claimed good results. This guy has tested multiple dozens of caps and has a fair grip on the subject matter.

Just an example, the caps in my crossovers have 4 in parallel to get the required value.
mag16-2.gif
Bryon, judging by the photos you linked to in your first post dated 2-12-11, it appears that the circuit connections are on a layer or layers internal to the board. Unless you can see exactly where they are by shining a light through the board, drilling holes would therefore be a no-no.

Best regards,
-- Al