New Use for Sub-Woofer

My tube amps and speakers here roll off pretty steeply around 50Hz, but they reproduce most songs quite effectively (and with only 10 watts, more than enough to annoy people not interested in my music).

Well, that could very well be the powerline itself. Have you looked at the AC line lately? It looks like the power company's amplifiers are class C (crossover distortion) and going into clipping! ;-)

Subwoofers are usually set for under 100 or 200Hz, down to perhaps 20Hz, which is hardly a tone, more of a physical movement than anything.

Tim

Back in my loudspeaker-building days, I did see what the power line waveform looked like. Last time I looked was only a couple years ago. It looked to me fairly close to a sine wave. Then again, so does a parabola wave (integrated triangle wave) - barely visually discernable from a sinewave on a scope, with THD around 4%.

Darn few work well at 30 Hz. I made one that did.

- Don Klipstein ( snipped-for-privacy@misty.com)

Electric service utilities using power amplifiers? What a bizarre concept. They use generators, conductive transmission lines, and transformers, they cannot afford the losses of power amplifiers, nor have i heard of any power amplifiers at the 1000 Megawatt level, typical of a common generating station.

The kind of distortions you are seeing on the lines is coming from the loads, not the source.

Obviously. I see sarcasm is lost on you...

Tim

And amplified sarcasm on you.