jvandyke_texas

Great picture. Next step curtains.

I'm keeping my 700B stock. I can tell you where to add 2 capacitors to stabilize it. I view WOPL as a sales job.

It's information that must be speed bounded.

Was the script for the three viewpoints written by three people?

He gets some of it right. I was in Honors physics class in my first year, and one assignment was to mathematically describe the tides. I got the right answers at selected points, but not the overall function. Function was 3rd order and had an R^3 in it. The way to find the solution is as he says, to treat earth as totally covered in water. Then you assume if there is a change in gravitational potential, water will flow. So the whole earth has an equipotential surface. Calculate that, and you have the tides. I think it was about a meter. The reason why Bay of Fundy in Nova Scotia has such high tides is because there's a body of water that has a resonant frequency equal to the tidal period. Water sloshes in and out with a period of 12 hours.

Rereading Greg's posts, I understand them and now agree with much of them. Yes, inside the SS amp, it's not a good voltage source, does not have low enough impedance, and has efficiency issues. Improvement on these problems has been the subject of amp development for the past 50 years. However, with negative feedback, outside the black box amp, the load has the illusion of being driven with a near zero impedance source. That is, until the internals of the amp operate out of the linear region, and can no longer respond to feedback to keep distortion low. Then it is not longer an amp.

And put "bounce" sheets in the dryer with GF's bras.

Do I have something backwards here, and don't fake it if you don't know. My thinking was at resonance, the speaker cone has maximum excursion, and you are getting much sound produced. So you don't want to dump energy into that and create more peak in the response if it's treble. But I thought in the old ported enclosure woofers, they would detune resonance and damping so that it would extend bass response with the Q peak beyond lower cut off. So you probably do want to dump energy there. That just isn't going to work well with a SS amp if resonance is parallel and high impedance. Maybe contemporary ported boxes are designed to have series resonance to do the same trick. Is that what's in the Infinity Kappa 9 amp killers?

You might do a tube top and SS bottom.

Oh, the voltage source amplifier has been practically attained for 45 years. We measure distortion of (Vout/Vin) and it's very small. But is that design what we want for the speakers we have?

It's clear that humans are not necessarily interested in accurate sonic reproduction. If we were, tone controls would be adjusted to compensate for room acoustics at flat response. Bass would never be turned up to 8 and Basspig would have a 250W stereo, not 20kW with an auxiliary breaker box. There would be no Gundry dip. It's not hard to extrapolate that there's something about tube powered amps people like that's not necessarily related to sonic accuracy.

I disagree with much of what Greg says. With voltage negative feedback, solid state amps perform close to ideal voltage sources. When they run out of linear region, distortion goes up, and they become something else. You can construct an amp that monitors load current and use that as feedback if you want a constant current source type of amp. That design can also run out of linear region and no longer be an amp. It depends on series or parallel speaker resonances. Amp efficiency is an implementation issue. I always thought all I had to do was get a great tube amp, and I would be in sonic bliss. However, with the introduction of solid state amps, it was discovered that speaker systems had to change to match SS amp characteristics. Speaker systems of tube and SS eras match amps of each era. Much of this is how speaker impedance behaves at resonances.

It comes down to whether a speaker load looks like a series or parallel resonant circuit at it's resonant frequencies. One favors a current source, the other a voltage source if you don't want to dump power into the resonance.

I'm more involved in the nature of doing nothing.

Ironic that the CD medium which can finally handle music's dynamic range is treated as if it has no value by recording everything hot. I'm sticking with LPs or FLAC.

Sounds like if you have a Carver Platinum with a ribbon problem you are stuck. True?

I heard these speakers as a young man, and always have been curious. How can you have the speakers but not the box? How's the woofer sag?

Virgin album covers where people haven't inked in the "L" command a premium.

Analog doesn't have infinite variation. You would soon hit the noise floor. A typical record is 68 dB. A CD is about 100 dB. Music isn't random. There's high correlation across samples. There's a lot fewer possible listenable songs than you might first imagine.

It's possible your sub has a switching power supply. You could be getting RF through the power line.