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Original Message

RE: Crossover upgrade for Tympani IVa

Posted by andyr on January 23, 2021 at 16:56:49:

Here is the stock T-IVa XO schematic:

As you can see from the FR:

... it could do with a bit of tweaking, for a smoother FR. :-))

I would suggest a better SQ will be achieved by:

1. combining the internal & external XO sections into 1 external box, allowing you to remove the ribbon HP filter from the 'embrace' of the 75uF cap in the external XO.

2. minor adjustment of the roll-off points, to achieve a smoother overall FR.

This leads to the following XO schematic:

Having this FR:

Choose the best components you can afford for the passive filters - eg.:
* 12g ribbon inductors
* good film caps - eg. Jupiter.

Unfortunately, though, doing this doesn't allow you to get rid of the level difference between the bass panels and the mids & ribbons.

The only way you can do this is by replacing the external passive XO with an active XO and using one amp on your bass panels and another on your mids & ribbons.

This would give you the following FR:

Good luck,
Andy