Edgar
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Posts posted by Edgar
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2 hours ago, babadono said:
Notoriously they are used(or used to be) sitting right on top of a mixing desk for near field monitoring to make sure a mix sounds good on small speakers.
I believe you're thinking of the NS-10.
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11 hours ago, Khornukopia said:
Just connecting that across the open wires and watching the voltmeter saved me from ordering different and expensive speaker wires for my audio systems.
Physics and mathematics work! 👍
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@babadono, great minds think alike.
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4 minutes ago, Khornukopia said:
You guys persuaded me to bring out my Fluke voltmeter, connect it onto the 2 unused conductors of a 4 conductor "speaker wire" while powering a loudspeaker with the other 2 conductors. The inductance is generating a small voltage in the 2 unused wires. This was a quick non-scientific observation so there could be some error but, I think it will steer me to study the situation with all my speaker wires.
Were the two unused wires connected to loads? The induced voltage is likely to be higher with an open circuit than with terminations. Try it with a few Ohms on one end (loudspeaker proxy) and a few milliOhms on the other (amplifier proxy).
Last time I triamplified my speakers, I braided the cables. That way each one crosses the others at an angle, reducing mutual coupling.
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8 minutes ago, TexDrone said:
The wire is left over from a CNC machine build.
I certainly hope that this doesn't lead to another Audiophile Myth. 🙂
Using non-audio wires for audio? Blasphemy!
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I would keep the woofer wires as physically distant from the midrange and tweeter wires as the construction permits. Woofers carry the most current, often by a considerable amount.
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If "7C" means seven conductor, then you can think of it as three pairs plus one extra. Just don't be tempted to connect all of the negative wires together -- some amps will tolerate this, but many will not.
Ideally you would use three twisted pairs, because without the twists there can be crosstalk between the signal pairs due to their close proximity. Maybe experiment to see if it's objectionable -- I suspect that, with such small signals and short distances, it won't be.
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15 minutes ago, sputnik said:
I was thinking of making that fix. Thanks.
The blades no longer match their reflections in the canopy.
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9 hours ago, Travis In Austin said:
So I'm trying to clarify when you use the term "Baltic Birch" what are you referring to?
Though it may no longer be true, for a long time one indicator of true Baltic Birch (from the Baltic region) was that it was only available in 5'x5' (1525 mm) sheets.
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23 minutes ago, Travis In Austin said:
Interesting article:
[etc.]
One theory is that the woofer enclosure should be so rigid that any wall resonances occur at frequencies higher than the upper frequency of the bass driver. By contrast, the midrange enclosure should be "floppy" enough that any wall resonances occur below the lower frequency of the midrange driver. The text that @Travis In Austin quoted supports this theory, and emphasizes that those requirements conflict when the driver handles both bass and midrange.
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19 minutes ago, ODS123 said:
I'm thinking ZERO difference in sound performance, but point taken.
Or not enough difference in sound performance to overcome the advantages MDF brings to the design, whatever they may be.
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9 minutes ago, ODS123 said:
So, I'll ask again, do you think Roy chose a sub-optimum material for the CW4's?
Don't forget that the definition of "optimum" depends entirely upon what one is trying to optimize. Roy, like all engineers, has to balance a number of performance criteria, including price, measured audio performance, manufacturability, shipping costs, availability of raw materials, and so on. Even "cost is no object" designs are subject to this same balancing act.
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30 minutes ago, Audible Nectar said:
I'm still looking for a unit like this - I want one "four way" with a heavy gauge cord. Thought finding one with just a four outlet box like this would be easy to find but I guess not. Am I just looking in the wrong place - figured this would be automatic at home improvement stored but I guess I'm wrong......
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It is my understanding that woods used for stringed instruments are selected for their contribution to the tone, while loudspeaker enclosure materials are selected for their lack of contribution to the tone.
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11 hours ago, ClaudeJ1 said:
Here's more from Bill Fitzmaurice: "... Fs out of the box was 65Hz. After break in it came down to the spec'd 55Hz. Every time I put it in a new cab Fs was down a bit more. The last time I measured it Fs had come down to 48Hz."
Something doesn't look right. For Fs to decrease by that much, the suspension compliance would have to increase by 83% [Fs is proportional to 1/sqrt(compliance)]. That's a really big change.
I have a NOS quad of EVM-12L. Maybe someday I will conduct an experiment, if I can find the time.
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1 hour ago, ODS123 said:
^ I agree with everything you said Edgar.
From a purely objective standpoint, I agree with most of what you say, too. In this context, it's just not necessary to be purely objective.
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1 hour ago, ODS123 said:
In response, I get: Why bother!! If I hear a difference, that's good enough for me.
And it is! This is a hobby, not rocket science. A good portion of the enjoyment of the hobby is pride of ownership. And that is based largely upon subjective opinion. And often that means impressing others as much as impressing one's self. And often that means deluding one's self as much as deluding others.
Whenever a friend asks me what I think of their audio system, I always answer with, "Do you like it? Yes? Then it's great."
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9 hours ago, ODS123 said:
His final summation after noting very small measurable differences b/w BB, Pine Play, MDF, etc..
"You can hear the difference? ..I would dispute that"
Be careful; that was an opinion, not a statement of fact. Assertion without proof that something is not audible is an equivalent logical fallacy to assertion without proof that something else is audible. In fact, proving that something is audible is a lot easier than proving that it is not.
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Here is another interesting bit of information: PLYWOOD vs MDF For Speaker Building - Tests Show Surprising Results
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15 minutes ago, Dave A said:
However @Travis In Austin #3 Baltic Birch is the correct superior material for water resistance, tone and durability. Exceptional speaker cabinets are made from this.
I don't have sufficient breadth of experience to comment, but I found this to be interesting.
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5 minutes ago, ODS123 said:
The measurement that matters most is the consistency with which people can hear a difference. Of course there are measurable differences b/w speaker cables, amplifiers, DACs, CD players, etc... But do the measured differences rise to the level that they can be heard??
True, but arguing about what other people cannot hear is futile, or hubris. I am willing to comment only on what I can or cannot hear myself. I am sometimes amazed by what others can verifiably hear ... and I have, on rare occasions, been able to similarly amaze others with what I could verifiably hear. Often it boils down to knowing what to listen for.
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8 hours ago, Travis In Austin said:
@Edgar you have also observed "measurable changes" in new drivers over time (albeit, the changes were less significant, or not significant for your purposes - if I recall that correctly). How did you run those drivers in? Music, single tone, pink noise?
My testing, if you can call it that, was very informal. I had a pair of NOS Electro-Voice EVM-10M (similar, if not identical, to Klipsch K-41) that had never been installed. I removed them from their cartons and measured the Thiele/Small parameters. Then I hooked them in parallel with the woofers on my main system, put them in another room so that they wouldn't interfere with the SQ of my listening room, and ignored them for a week. They were run without enclosures, and received whatever signals the woofers of my main system received. This was a biamplified system, crossed-over at 180 Hz and equalized flat to 27 Hz, so there was a fair amount of boost below 40 Hz.
After a week of normal listening to everything from Pink Floyd to television programs, I measured the T/S parameters again. I don't recall the exact numbers, but there were changes and they were very small, on the order of a couple of percent.
Make of that whatever you please.
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4 minutes ago, ClaudeJ1 said:
Back to your statement about "3 db is 100 percent." Are you saying you once measured a woofer break-in that yielded that much change? If so, for the entire band? Or just part of the curve? Did the VC cool down before you measured said 3 db, or after?? Did this happen once, or over many driver measurements?
I was wondering the same sorts of things.
Another way of looking at it is, "100 percent is (only) 3 dB". That means that driver parameters can change by a whole bunch and still yield just a 3 dB difference. And as I showed in my WinISD model previously, even a 50% change in compliance resulted in just 1 dB difference.
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19 minutes ago, Islander said:
Travis was making a reference to The Electric Kool-Aid Acid Test, written by Tom Wolfe. But you probably knew that already.
Can't say that I did. Well, you learn something new every day.
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Why I Have Exotic Speaker Cables
in 2-Channel Home Audio
Posted
Superstitions run deep, and are almost impossible to eradicate.