I've got some circa 1978 Belles. Running Marantz SR6007 receiver with preouts to Emotiva SA-250 for the Belles. In a past life I had a tube amp and La Scalas with Crites tweeter and and xover upgrades. Wanting to upgrade the Belle. Like the Volti route but price is an issue. Is there a set it and forget it xover that I can get now that will work with stock (or upgraded tweeters if need be) and then get the upgraded horn and 2" driver later? Thanks.