Problem Solvers Needed-Got my New XOs installed and am worried....

Some good suggestions; 1) Contact the expert and describe your issues. Crossovers don't need burn-in to sound good, just get better. 2) Good suggestion mijostyn, maybe error. My thought; Hope the original iron core inductors were not replaced with air cores, especially for the low frequency drivers. Iron is usually better than air for woofers. Ask "expert" for a detailed schematic for the crossovers he made for you.

I will tell you this, I have TRT teflon caps in 3 pairs of speakers I currently own. If you wanted to listen to them you could, I COULDN’T for over 200 hours. 500 hours was considered broke in.

So we are clear the manufacture told me to put the speakers under moving blankets for 24/7 with a SS amp and 10-30 watts going through them. Turn them off and on every 2 hours for the DC tickle on startup. It was the only way to break in teflon caps, it worked every time for me.

Two pairs of speakers I owned were sold BACK to the manufacture because of the BAD sound, and the customer said so.. "It should sound good when they’re delivered". I agree 100%, but I also paid 50% less for a break in..

I still like teflons the best.. Copper foil are pretty good too for mids in the band pass, a lot easier to break in to. 50 hours tops.

I’d make darn sure they were hooked up correct and let them percolate for 2-300 hours... All the time, stay in touch with the guy that sold you the XO. Did YOU asked him to do something silly? OR are the XO changes his idea?

His idea, his problem.
Your idea, your problem.

Be patient..

Regards

The only way to upgrade a crossover is to put higher quality parts in place of the old parts using the existing values, if you try to change things bad sound could be the result, as you have found out, lesson leaned i guess.

Assuming the new crossover is broken in, modern capacitors and resistors of the exact same values will change the sound, sometimes significantly. It's possible you're used to your original sound and the new parts aren't to your taste. This may be even More true if the crossover topology has also changed. The single most important factor in choosing audio gear is to know your self, especially the factors that must be there and the negative factors that you can't stand. If you don't know yourself well, changes are a case of throwing darts while squinting.

...now, I'm not brilliant, nor a xover designer, but....

One look at the existing...

https://reverb.com/item/10409571-tannoy-fsm-pro-215-studio-monitors-15-dual-concentric-15-walnut-woo...

...and I'd have replaced all existing components with new and Stopped.😬

If a change Had to be made, iyo....a nice outboard active crossover, bit the belt and bi-amp carefully....

Looking over the charts with the ad above, the existing units seem pretty  'exquisite' for those Tannoys'....even the inductors should be approached with care for a revamp...imho, which that + a buck might get you cross-town on a bus.

Vintage includes components not really made the same as now.  I'd pause at just reconing them, just about that....

They're not speakers anymore....you've got a pair of mistresses...;)
Good luck....both are expensive, as you've discovered....