You're simply wiring the tweeter out-of-phase.Originally Posted by BobM
It would sound better if your tweeter was improperly wired in the first place. And in a non-phase-coherent arrangement this sort of thing can happen.
You're simply wiring the tweeter out-of-phase.
It would sound better if your tweeter was improperly wired in the first place. And in a non-phase-coherent arrangement this sort of thing can happen.
What kind of crystals do you use?
Here is something interesting I just found in my Pre Amp Manual, and it is from the early 90s so nothing new.
http://www.vac-amps.com/manuals/Manual_CPA1_Mk3.pdf
Please note that power cords will have a profound influence on the character of reproduced sound
inspite of the CPA1's extensive power supply filtering and regulation, as will floating the ground
conductor.
I don't use Crystals and I have not challenged anyone who does. So what do Crystals have to do with those who claim Audio tweaks don't work when they have never tried them?
Or could be rewiring this Tweeter in phase. It depends on the type of crossover configuration, where some tweeters are wired 180 out of phase to match the time delay of the crossover. It's a harmless tweak.
Okay, I checked it out.
Questions:Sorry, this video raises more questions than it answers for me. Unless he's INTENTIONALLY oversimplifying the problem of noise on the AC mains -- and not telling us he's oversimplfying it -- the whole thing reeks of a parlor trick.
- Why does he mention a "component-to-component noise filter" and then test the line voltage noise?
- What are the units-of-measure on his little white noise speaker?
- He mentions the unfiltered line noise reads "about 100" but when he plugs in his power conditioner it drops to 46.
- Is this scale linear or logarithmic?
- How does he propose that his line filter affects power sockets not connected to it?
- Next he connects his speaker box through the filter and gets a reading of 0.1
- He states this is 1000x better
- So apparently the scale is linear?
- Most sound measuring devices use the decibel scale, which is logarithmic
- But as an engineer he should know that, right?
- How does his speaker box make the noise audible, when most of it is UHF/RFI frequency (beyond human hearing)?
And, more to the point, it totally ignores the noise filtering built into every stereo component's power supply.
The point the video made is that there is a clear and audible difference. I can't answer all your questions as I am not an EE or designer of such components.
But like I posted 10 minutes ago, VAC suggests the use of After Market PCs "inspite of the CPA1's extensive power supply filtering and regulation, as will floating the ground
conductor. "
Why do you think Kevin Hayes would suggest that? He does not MFG or sell power cords.
And when are you going to start answering questions as opposed to only asking them?
Sorry, but this is most likely a bad idea.
A well designed speaker has a very specifically designed crossover. Among design parameters taken into consideration, are the order of the crossover and phase of the crossover, especially at the crossover point, and how even slight changes can effect speaker performance.
Playing with the phase of one set of drivers in relation to the other drivers in the system, in opposition with what the speaker designer had designed for, would not, from my experience, have a positive effect.
For example, the following image shows a hypothetical crossover point, where the dip at the crossover point is cancelled by a combination of rolloff and phase relations of the drivers, giving a flat response. By wiring the tweeter out of phase, (depending on how the crossover is designed) you may end up with a peak at the crossover point, or a dip.
dad4bf7b77a43ec955a8806a59cab246045118a6.gif
The other problem is, that some people (I am one) can hear the difference in absolute phase. If you have a positive pulse in signal, but the speaker driver is moving backwards (or vise versa, a negative pulse, speaker moving forward), instead of forward, this can make an audible difference. The perceived difference is that the speaker no longer images well in the frequency range handled by the out of phase driver. Images usually lose focus, depth, and ambience.
So, reversing the absolute phase in the tweeter in relation to the other drivers, would have a negative effect in the imaging in the high frequencies.
And if there were a god, I think it very unlikely that he would have such an uneasy vanity as to be offended by those who doubt His existence - Russell
If you listen to the AC mains.
You're telling me you need to know what kind of equipment I use in order to determine if $60 power cords would do me any good.
I'm telling you there is no such thing as magic. THAT's where the crystals reference comes in. Sorry if that wasn't clear.
Phase is frequency dependent, and it's never as much as 180º out. There is no "time delay" in a crossover.
Last edited by rcarlberg; 01-23-2018 at 03:57 PM.
You guys are all reading my wiring suggestion wrong. It is not out of phase. It's just that one leg of the wire is on the woofer binding posts and the other leg is on the tweeter binding posts. Not out of phase at all. You just jump from there to the other remaining binding post.
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A gentleman is defined as someone who knows how to play the accordion, and doesn't.
What then, is it supposed to accomplish?
Yeah, I get it. One wire comes from the amp to the tweeter, then jumps to the corresponding woofer, then the other wire comes from the amp to the woofer, and the jumper is set to the tweeter.
I thought the point of bi-wiring is that the drivers are connected directly to the amp; and using a cable like the Canare 4S11 Cable, which has four strands of wire; two to the amp channel, four to the speakers.
"Always ready with the ray of sunshine"
Then what does that configuration accomplish?
When I was replacing a tweeter in a speaker (not mine) I asked the rep on the phone if the blue lead (there wad a blue and a white wire) was positive or was it the white wire. He said the blue was, but the tweeter should be wired out of phase for the type of crossover (it was a Kenwood speaker) and I believe it was a 2nd order crossover.
Apparently it's another example of magic. Maybe the extra 2" of cable the signal has to traverse, at the speed of light, makes an audible difference if you have Golden Ears?
That's possible, but not for the reason the rep gave.
I'm assuming the Kenwood speaker was a bookshelf speaker, with both drivers mounted on the front board? That places the tweeter voice coil an inch or so in front of the woofer's voice coil (depending on the woofer's depth) so putting the tweeter out-of-phase with the woofer would create a phase-coherent waveform at certain frequencies, where the wavelength is a multiple of the differences in voice coil alignments.
yep
but maybe that appeals to them. I believe the term is called "euphonic" (sp?) Of course, depending on the slope of the crossover, you could risk damage to the tweeter I suppose, if indeed you introduce a big enough peak at cut-offBy wiring the tweeter out of phase, (depending on how the crossover is designed) you may end up with a peak at the crossover point, or a dip... reversing the absolute phase in the tweeter in relation to the other drivers, could have a possibly negative effect in the imaging in the high frequencies. (italics indicate embellishments by myself)
It was a standard two-way and phase coherence was the term that was used (it was years ago so I could be fuzzy on the brand), so phase shift was my mistake. I was replacing a blown soft-dome tweeter for a friend (but not a factory replacement).
F@ck cables. Andrew Jones leaves the dinosaurs in the dust:
http://www.avsforum.com/best-of-ces-...ered-speakers/
Well I won't be getting the Maze Eden cord. After I placed my order and paid, I got a tracking number that kept telling me there was no package to track. When I emailed this morning just to make sure I had a good number, the guy cancels my order, refunds my money, and sends me a F'ed up email back telling me that I am a Demanding Customer and will never be satisfied....WTF
It turns out that Maze Audio is really just a guy and his kids making cables on the kitchen table anyway. But what an ass.
May have to try a Cullen
What about Bluejean Cables, the "Monster" killers?
"Always ready with the ray of sunshine"
They don't do Power Cables
In my original post I said I don't understand how this can make a difference, but I've heard it - it does in some cases. No, not all. But it's simple and easy to try and costs you nothing. Maybe you will hear something and maybe not, but what have you got to lose besides a little time?
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A gentleman is defined as someone who knows how to play the accordion, and doesn't.
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