Here's your problem. I tried to upgrade some Vandersteen 2CE Signatures once. They actually have 3 capacitors in series, so I bypassed them with V-Caps. The treble sounded horrid, they used the 3 caps to tame the tweeters. So, if you send the crossovers out and the speakers sound bad, you are not going to know why, or where to begin to address your problem. It's far better to deal with someone local who is doing this as a hobby. If you could ship the speakers it would be different. I did do a set of crossovers for a friend long distance, and we got lucky, they weren't trying to hide anything. I'd highly recommend that you learn to solder, and learn electrolytic capacitors, that is polarity, vs non-polar, etc., well enough to do the work yourself, or deal with someone local. Things you can ship, like amps, preamps, and such are fine to ship as the modifier can tell if a component is a problem or not. I am not trying to hurt anyone's feelings or business here, but experience has taught me that if you either don't have the entire product available or haven't previously modified one, it's best not to do so long distance. It could work out perfectly, but if there is an issue, how many times are you prepared to ship it back and forth to address it?