[captain]

Can any body in the UK help out. I brought a speaker kit off Wilmslow audio last year, I changed the tweeters a couple of weeks ago and had Wilmslow re-jigged the cross over. The speakers now sound real bad, and do not really want to get a new cross over through them. Is their any body else in the UK that I can get to do me a new cross over, as I can not build from scratch and need a big helping hand.

Thanks

[JoshK]

Did you switch the polarity by accident? Try reversing the connection on the tweeter.  It won't hurt anything, it will just sound worse if its wrong, but you could have accidentally hooked it up backwards when you put in the new xo. 

I would also try contacting Winslow and explain that it doesn't sound right and see what they have to say.  Maybe they can help you out or figure out what is wrong.  That is likely a more fruitful and cheaper route to follow.