I use to be a cynic when it came to conditioners too - but let me tell you this.
When I plugged in my Audio-Magic Stealth conditioner (in place of my panamax 1000+) - the changes were far from subtle... for about $400 used It's easily the cheapest "REAL" upgrade I have done.
When I plugged in my Audio-Magic Stealth conditioner (in place of my panamax 1000+) - the changes were far from subtle... for about $400 used It's easily the cheapest "REAL" upgrade I have done.