In my own system with Quad 63s (AC powered), it was a bigger jump than installing the original PP300. Quieter, more depth, and more 'harmonic integrity'- fuller sounding, but quicker on attacks and decays. Extremely happy with it! Your own mileage may vary......... Installation is a snap, almost literally. One board and a chip. It takes longer to read the comprehensive instructions than to do it! About 10-15 minutes total.
