i used the mundorf silver in oil exclusively in my crossovers. they are an extremely smooth and detailed cap. make sure that you have room, they are large caps. i also found that installing a bypass cap of a small value across the main caps, especially for highs and mids, really made a big improvement. actually, you can try that first, before replacing the main caps. check out this for info http://www.northcreekmusic.com/Bypassing.html
....don
....don