Well to change the subject my guys tried out the loudspeakers with and without the Zobel networks. Frequency response measured pretty much the same. Hands down sounded better with the Zobel at the end of 1000 feet of cable. Will try waterfall measurements soon as I expect it is a time hangover issue.
Ed: Can't you just move the amps a bit closer? Lighting rigs seem to be all local control now rather than central hunk o buzz that they used to be...
Some folks are doing that. Electrical codes are much easier to follow for low voltage wiring. The loudspeakers are accessable only by rappelling. Then the idea of ventilation without water ingress is a bit tricky. We do air condition the amplifier rooms. In some locations the weather destroys the loudspeakers in five years. Then there is the issue of getting clean signal to the amplifiers. It actually requires less copper wire to send loudspeaker level signals than the mains power with safety ground. I have also seen the loudspeaker mounts struck by lightning WITHOUT damage.
The amplifiers I use are switching amplifiers with DSP built in. They still have a bit of weight. Failure rate of the ones I prefer have a failure rate of under 1% including break in. The next best run 2-3% and the popular brand name has gone as high as 10%. Loudspeaker failures are 0% except for the one stadium's worth where the woofers were connected to HF terminals and LF terminals to the compression drivers. Warranty claim was mid 6 figures. They also randomly wired front and back circuits on a specialty fill loudspeaker.
(The manufacturer wanted to know why I didn't test all of their loudspeakers before installation. For some reason no other manufacturer has ever had such bad quality control.)
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Now back to the real world: Today I am faced with what RCA male and female that I want to use to evaluate the latest Bybee devices. For the moment I will stick to two choices from the past, that were used in the Vendetta SCP-2 Phono preamp successfully. First the ultra pure copper Tiffany with gold directly applied without a nickel interface, and second, the normal copper Tiffany with the nickel interface. One pair of each, ground return made with VDH Linear Xtal copper leads hard soldered with SN62 to each connector. Later, I might try a new design that I am told could be better sounding. What trouble it is to get something right! '-)
There is no perfect grounding with (soft) soldering. Spot welding, silver hard welding, or high pressure contacts... even crimping is better then tin soldering.
Bybee products are out of physics, and no comment.
Bybee products are out of physics, and no comment.
Gee John, now that you demonstrated that you can be very humorous, it's not getting easier for us.
But from the contents of your quoted post, I think I am safe assuming it is a continuation of your humour pose. 🙂
Jan
The problem with organic products is not so much the premium you have to pay for them, but the fact that pure organic simply cannot feed the world population.
In the mid seventies, my late father, acting under pressure from me, started growing on a small patch of summer house land, his tomatoes (I am a total tomato junkie). The tomaties he produced were smaller than regular, but could be smelled at 10 yards away as no reglar ever could, and was tasty all on its own that eating them with just plain bread would be a good meal. However, its total yielded output was like 1/3 or 1/4 of the regular. Economy wise, the fruit juices he produced (fully Pasteurized in a special pot using simple water vapour from his own well in which water starts at 33 feet down) were like no other juie I ever had from anyone anywhere, but at the true economy prices, it would cost over 3 times the usual industrial. Not many would pay for it at such a premium, even if the taste was heavenly.
Great T shirt.... Glad to see number 16 -- that one drives me nuts, so many people say it... Is being something of a pedant a function of ageing?🙂
back on power supplies I saw this PS Audio PerfectWave P10 Power Plant AC Regenerator | Stereophile.com and thought that might start some discussion. According to PS-Audio the best sine wave isn't a sine wave...
Are we suppose to talk about how J. Austin doesn't understand electricity or the banes and boons of the PS Audio unit?
You are not 'supposed' to discuss anything. It just intruiged me how you can get the same effect (flat top squarewave) for free just by turning lots of stuff on. Makes sense as a marketing story in the time domain. Hate to think what the frequency domain looks like..
Mr. Austin says:
Typical journowoffle from someone who has learnt some words but not learnt what they mean. The main limit on cap recharging is circuit resistance and inductance; a typical mains filter will make a negligible difference.
If a filter removes harmonics, then it removes the effects of harmonics such as flat-topping. Now whether the unit in question does this or not is a separate issue, but in principle a power filter can 'add back what is missing' (which in more technical terms means 'remove what has been added'). [Just noticed that in a footnote he admits that he was talking nonsense.]
Maybe where he lives, but in most civilised countries the electrical infrastructure is well-maintained. What has actually happened is that changes in technology have not bothered to keep up with good engineering practice.
Only if your fancy high-end gear is poorly engineered, which may well be the case.
Once sufficient time has been given for the cap to recharge, giving it more time makes no difference. Ripple is determined by discharge time, not charge time, so it is only slightly improved by increased charge time because that necessarily reduces discharge time. By the way, didn't he imply that flat-topping was a bad idea (when it is provided free of charge by the mains supply) - but now it is a good idea (when it costs you $5k)?
Better. Much better. The area under the current waveform (Q = integral of I*dt) remains the same, but the peaks become shorter and wider, which reduces the higher harmonics. Thus the equipment spews less HF garbage back into the mains, and whatever induction current loops exist within the chassis, radiate less HF garbage into unwanted "victim" circuits.
Victim: a wonderfully apt term used in high speed digital comms signal integrity work. The motherboard of your 1.9 GHz laptop has had LOTS of signal integrity "victim" analysis performed upon it.
Here's the mains waveform at my house (bottom trace). Not quite a sine wave. If you view the image at 100% and squint real hard at the upper trace, you can see that the diode-induced ringing amplitude is bigger than the secondary voltage (!). This is a particularly not-excellent diode.
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