fill35U

I'd think keeping it below 5kHz would be fine, and there wouldn't be a need to go higher than that (octave away from the 2k notch). Go much higher, and either the neighbors will howl or their pets will! Wouldn't running well below clipping be worse than running at clipping? With commutator lockup at high freq she's just a normal Class AB. Worst dissipation would be around 40%, max efficiency at close to full output? Has anybody blown up an A-500/760x by feeding her high level/high freq tones?

Easiest way for you might be YouTube. Use your computer or phone to play through your system. Lots of vids with test tones as their audio tracks. This YouTuber has a bunch on their vids HERE . Edit: this is simple, too - onlinetonegenerator.com Edit: and this is highly versatile! - FUNCTION GENERATOR AT wavtones.com There's lots of free software out there that'll generate test signals, if you don't mind installing on your 'puter. You might already have that feature and not know it! For that matter, there are phone apps, too. You don't have to physically plug your phone or 'puter into your system, there are inexpensive wireless Bluetooth receivers that can keep things convenient. Some offer darn good sound quality. You could also buy/borrow/burn a test CD with tones on it. Crudely, perhaps tune to static and use EQ to boost one frequency band and cut everything else?

It should be easy and informative to use a tone (sine) generator for the signal source. If there's a frequency range that blows the fuse consistently, that will give you a clue as to where to look. Would be nice to have an ammeter to read while you're doing that. Maybe rig a shunt resister and a voltmeter across it? Absolute readings not so important as relative ones across various volume settings and frequencies. Make a chart...

Those Silvers XO's are a mess of spaghetti! Maybe start looking hard in this area: Rearrange all the wires, until there's at least 1/2" between each one. Then play loud and see if the fuse still blows. You might have to do actual troubleshooting if that doesn't work. Run the ribbons and tweeteers each alone, then focus on which section still blows the fuse. And I guess today is a good day to start a thread on my Silvers, too!

You're very welcome, aslan! Glad y'all enjoyed it! I got lucky a while back, and snagged a couple dozen Telarc CD's from the local Goodwill. How about this trumpet selection, from the same album?:

Wow, that rocked, David! Everything's better when you add girls:

For Kev: