I'm not familiar with the Zed amplifiers. Does "rare" mean that they're just as good as the high-end amps today and much better than the cheap amps today, even after 16 years of technological progress?Keep the Opti...that is likely a Zed amp and they are rare.
Should I be upgrading it? When I bought it back in 2001, they were the top-of-line Class D amplifiers and cost me a pretty penny (I think I paid $500 for it). Would it still be worth $500 today new or has technology progressed to the extent that a cheap no-name amp would work just as well as the JL?I can't tell, but are you looking to upgrade the JL amp too?