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All mains transformers hum. ALL of them. The extent varies, from 'barely audible even if you put your ear up close' to 'really annoying from the other side of the room', but they all do it, because the nature of electric-to-magnetic-to-electric conversion creates physical stress in the...

Lower case omega, as used in those equations, is frequency in radians per second, i.e. 2 times pi times the frequency in Hz. s is defined on the page as j times omega, where j is the square root of minus one, i.e. the basic imaginary number.

You'd probably be best off Googling for it (try 'D75104' or 'uPD75104' or just '75104') and finding someone who has stock. Mind you, according to the data sheet (you'll find that at alldatasheet.com) it's a 64-pin device so you'd better be good at soldering!

Bat ears are not actually more significantly sensitive than human ones, they're just sensitive to another range of frequencies, or rather a wider range. That said, they may be bothered by sounds which we can in fact hear but don't consciously register as alarming. You'd probably be best off...

RCA connections can often run tens of metres with no detectable noise problems. And while it's true that balanced connection is inherently a better system, in a lot of equipment (domestic and pro) there is extra circuitry to convert internal unbalanced operation to balanced output, and vice...

The business of dedicated digital and video cables is one area that is not snake oil. The point about cables sold for that purpose is that they are guaranteed to work OK. Over short runs particularly, most conventional audio RCA leads will probably work: some will work very well over long runs...

I quite agree, personally, that kind of amount of money is perfectly insane to spend on cabling for a domestic sound system. But then most of the contributors to this debate are evidently the kind of people whose idea of 'value' is in general based on functional qualities. I suspect most...

"Anything more than 100% shielding can be overkill just creating more capacitance" and "VP is the speed that the signal travels through the wire and its value is expressed as a percentage of the speed of light. Low capacitance and high velocity of propagation are key for wide bandwidth...

Just a note to add to the discussions going on about bal/unbal etc. Ground _loops_ are generally exactly that - loops that, in the presence of a 60/50Hz magnetic field, function as a 1-turn transformer, picking up hum current which then pops up as a voltage due to stray resistances. If you can...

I hate to risk spoiling a good laugh, but it is not possible that the guy's English is not as good as his hearing (?) and he really meant '...the lack of distortion, which had been causing bloat and grain'? Richard

"$20 US ? Including shipping? If others sell them for $140, you could start a business" Someone will, you can count on it. Thanks to the original poster for the picture here. When they turn up in the UK I'll be forewarned! R.

"Hmm...a few tens of volts per uSEc? Is that a correct number? If so, then, into 8 ohms, 20 volts/uSec is, 2.5 A/uSec...5 amps/uSec into 4 ohms..let's re-think the numbers... A power load with .15Uh inductance.... .15 uH load inductance will be 375 millivolts error into 8 ohms, 750 millivolts...

"1 uSec is not human capability, but an arbitrary factor of ten better setpoint I wish to work with..my point being, your setup, I suspect, is incapable of resolution at that level.." Of course it is. The limits are timing jitter (order of ns), amplitude jitter (order of -85dB) and nonlinear...

"you incorrectly assumed I was speaking glibly...I do not" No, I assume you're making life unnecessarily hard for yourself. Yes, there's more to lateralisation than Blumlein knew, but for the purposes of making amplifiers all we need to do is keep interchannel phase and level differences down...

"the DPS algorithms embedded within the machines are not sensitive to temporal distortions that trash lateralization imaging." Of course they are, it's called phase distortion, we've all had the technology to measure it for years. People were doing square-wave tests specifically to show it up...

<<I was curious as to how exactly you "listened" to the noise coming in from the AC line.>> Don't try this at home, folks! Not, that is, unless you have a designed-for-the-job isolation amp and experience working with dangerous voltages. You just build a simple HP filter so that the isolation...

<<To answer your question....both amp channels are in the same chassis, both are trying to control a low impedance load that is miles away (the wire inductance is there)..both channels are, internally, broadcasting lots of high slew rate magnetic fields that the feedback loop is...

The DakiOm is really brilliant. Someone has spotted a hole in the market and spun just the right line to convince lots of people that they have filled it. Frankly I'll be a monkey's uncle if they can offer any convincing proof that it works exactly as advertised (it will have some effect on many...

PS - should have said: please DON'T post results here! People reading them will all too easily be biased by them, despite best intentions. Richard

I have been doing some simulations of amplifier performance, just out of interest. In the process I have come up with a simulation of a particular characteristic which can be best described as subtle in the extreme. I am curious as to whether this is audible (yes, I've tested it on myself but...