I don't know any "cost effective" upgrades. The recommended upgrades which I am familiar with are hovland caps(10x costlier) and mills resisters. Replacing the inductors would also make a difference, but you did'nt mention those.
Crossover upgrade-what benefit?
I have a pair of Proson Reality 66 (4 Ohm, two way floorstander from Sweden) that have a simple crossover: one 3.3mf 100v capacitor and one 2.2 ohm resistor. What benefit would I get from changing these to a higher grade. I am looking for cost effective parts. chryslerjay@excite.com
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