WHY? Honestly, your amp is 70 wpc of pure tubes, your speakers are 92db at 1 watt. That puts you at about 110db continuous. That's without a pair of 500 watt subs. Are you using a crossover on the speakers or running them full range?
By bridging to 140wpc will only gain you about 3db which probably isn't even audible.
I do speak from experience having owned the 509's with coincident speakers rated at 92db. Things got pretty loud at 10 watts. I can't imagine needing 140wpc.
By bridging to 140wpc will only gain you about 3db which probably isn't even audible.
I do speak from experience having owned the 509's with coincident speakers rated at 92db. Things got pretty loud at 10 watts. I can't imagine needing 140wpc.