250Ti BQ LTD crossover issue

[Don C]

I'd be disconnecting everything else for a minute to check the switch with an ohmmeter.

[Robh3606]

I'd be disconnecting everything else for a minute to check the switch with an ohmmeter.

The switch won't kill the tweeter. It just switches out attenuation and is floating when +2 engaged. R17 should not have a solder ball on top. Could be a broken lead under there. You can take out R18 and the switched components you still have a functioning tweeter. You can't take out R17 without taking out the tweeter.

Take a close look at both leads there is no stress relief on them and they could have fractured.

Rob

[grumpy]

May just look like a solder ball on R17... the groove in the resistor 'case' just amplifies this perspective.

At any rate, if the wiring to HF is good and the other drivers play, there's an open (signal path in series, such as the caps) or a short (to ground, probably after the caps) in just a few related parts (including solder joints).

If a soldering iron and associated skills are available, this should be straightforward to address (pull one leg of a suspect part that's going to ground, or bypass/jumper a series connection... and use very low volume noise as a source and perhaps insert a capacitor in-line, say 1-10uF, for more tweeter-safety).

An oscilloscope (even a very cheap USB based thing) would be nice and quick, but not everyone has such a thing handy, and there is a learning curve.

Nice speakers, and worth some effort to repair/resolve.

[Dagfinn]

Thanks, guys. I'll check closer when I get it out, but I think I'll have to get help, getting to the small caps underneath will be a bit over my comfort level as far as soldering. But I'll try to find the fault, at least. Here is the working one, in non-standard position, perhaps. One owner, very nice and shiny still . Can't wait to get them playing properly!

[Dagfinn]

So, while the c.o. is out for repairs, I'm toying with the thought of going fully 4-way active. Use a dbx 234Xs, as I already have one in house. Do one speaker first, see if I can match up it up to the passive. There's probably some issue with this I'm not aware of yet? Advice appreciated . Dagfinn