Edgar
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Posts posted by Edgar
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14 minutes ago, babadono said:
I do not understand why a DSP version of something similar is not made today.
Do you know of a general purpose DSP "engine" that is fully programmable? It might not be a difficult programming job to emulate the DBX functions.
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14 minutes ago, Mighty Favog said:
If this makes any difference, it went something like: first roll = 4 on both dice, second roll = 1 on both dice, third roll on = 6 on both dice, fourth roll = 1 on both dice.
Yes, entirely different problem. I misunderstood.
EDIT: But I think that the answer comes up the same, depending upon how you state it.
First roll: You roll a 4, what is the probability that your wife will roll a 4? 1/6
Second roll: You roll a 1, what is the probability that your wife will roll a 1? 1/6
Third roll: You roll a 6, what is the probability that your wife will roll a 6? 1/6
Fourth roll: You roll a 1, what is the probability that your wife will roll a 1? 1/6
Total probability: (1/6)^4
Looked at it another way ...
First roll: What is the probability that you will both roll a 4? 1/6 * 1/6
Second roll: What is the probability that you will both roll a 1? 1/6 * 1/6
Third roll: What is the probability that you will both roll a 6? 1/6 * 1/6
Fourth roll: What is the probability that you will both roll a 1? 1/6 * 1/6
Total probability: (1/36)^4
And yet another way ...
First roll: What is the probability that you will both roll the same number? 6 * 1/6 * 1/6 = 1/6
Second roll: What is the probability that you will both roll the same number? 6 * 1/6 * 1/6 = 1/6
Third roll: What is the probability that you will both roll the same number? 6 * 1/6 * 1/6 = 1/6
Fourth roll: What is the probability that you will both roll the same number? 6 * 1/6 * 1/6 = 1/6
Total probability: (1/6)^4
Computing probabilities always gave me fits.
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4 minutes ago, PrestonTom said:
Noticed that Edgar said "selected number".
So, yes the calculation is correct (if you said before the 1st roll) the probability of a "four", but you could have said (before any roll) any of the 5 other numbers. So the probability is a higher, ( that 4 rolls would be the same number, but not necessarily a specific number) but overall it is still quite small.
That's a really good point that I missed. If you select the target number before any rolls, then the probability is as I indicated above. But if you count as a success any number coming up four times in a row, then the probability is increased 6x because there are six numbers. That is to say, "1,1,1,1" is a success, as is "2,2,2,2", "3,3,3,3", etc.
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4 minutes ago, Mighty Favog said:
Lorrie and I were rolling dice to see who gets the first roll/turn at a game of Yahtzee. We each rolled a single die and it came up with the same number 4X before we could start playing.
Now what's the chance of that happening??
There is a 1/6 probability of any selected number coming up on any roll. If it's a fair die, then each roll is independent of the others. So the probability is (1/6)^4 = 1/1296.
If it's a loaded die, then the probability is greater than that.
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5 hours ago, Schu said:
This guy is next
Serious question: How do you eliminate the reflections of the photographer in the subject's eyes?
I always shot landscapes. Never had to deal with that problem.
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Just now, Klipschguy said:
Edgar those are events we never want to see. I assume the equipment was plugged into the surviving surge protector, which sadly only protected itself.
It happened over twenty years ago, and the story has probably been embellished in my mind since then, but the basic facts are that the UPS survived and at least some of the equipment that was plugged into it did not.
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2 minutes ago, Klipschguy said:
Yes, which did protect my tweeters from the 1.21 gigawatts they received during a scientific experiment.
On a somewhat related topic, my house once took a 1.21 GW lightning strike. The only piece of stereo equipment that survived was the UPS / surge protector.
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5 minutes ago, Klipschguy said:
Empirically speaking, it seems like DC will fry a voice coil MUCH quicker than AC, but as a student of science and engineering (many years ago) what you are saying rings true.Don't forget that the DC resistance of a voice coil is generally lower than the AC impedance.
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25 Watts RMS AC is exactly equivalent to 25 Watts DC, in terms of average voltage, average current, amount that a voice coil heats-up, etc.
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Understand that @Racer X is making recommendations on the current capacity, not the voltage rating. It is a compromise between how loud you want to listen and how much risk of tweeter damage you're willing to take.
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To send 1 Amp through 8 Ohms only requires 8 Volts. Use any 1A fuse that you can find; it will be fine.
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2 minutes ago, Islander said:
To shoot good photos, never mind pro-quality on\es, you first have to find a subject that you're passionate about.
At about age 25 I bought my first camera. Caught the bug, brought my camera with me everywhere I went, and got some really nice landscape shots.
About a decade later, I suddenly lost the passion. Never got it back. I miss it.
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Just now, Crankysoldermeister said:
Dude is relentless.
At the risk of veering even more off-topic, I had several PM conversations with Jeff, in which I tried valiantly to get him (1) to stop the personal attacks, and (2) to justify his claims scientifically. (1) would only work for a short time, and (2) didn't work at all.
Off-topic message complete. We now return you to regular programming.
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Just now, Coytee said:
Do they have to be the same color or, can you vary the color to fine tune the final reality?
I don't know whether colors add in parallel or add in series. Anybody?
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2 hours ago, KT88 said:
Thank you for the chart. It clearly shows that it is not about the ESR at the frequencies where the cap should filter. It is about the difference of the ESR in the low frequency range where we "actually do not" need this cap, and there a change from Mylar to PP can mess up a lot and change the impedance of the entire crossover unfavorably. In addition, amplified effects due to the high efficiency of the Heritage speakers.
Also, at the risk of channeling Medwin, remember that capacitance adds in parallel, while resistance divides in parallel. That is to say, for example, two identical capacitors in parallel have twice the capacitance but half the resistance.
The opposite is also true: two identical capacitors in series have half the capacitance and twice the resistance.
So you can almost always find some series/parallel combination that gives you whatever combination of capacitance and ESR that you need.
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9 minutes ago, 001 said:
is that bad or does it make it not a mustang anymore because the new better mufflers arent authorized by ford?
That appears to be a contentious subject here in the Forums. Chief Bonehead contends that modifications render the speaker to be "non-Klipsch". Some others feel that it's still Klipsch in its essence. Some of us don't care.
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@Crankysoldermeister, those values are about an order of magnitude higher than what I found when I searched just prior to posting my comment. It's possible that the values I found were all measured at some fixed frequency, like maybe 10 kHz. Regardless, thanks for the info.
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4 minutes ago, 001 said:
im trying to understand how changing a couple caps in the mid/tweet section to the same value as original (but lower ESR) can cause a speaker to lose bass?
This brings up something about which I've been meaning to comment for a while, now.
ESR may not be the culprit. Understand that ESR (equivalent series resistance) in crossover capacitors is milliOhms or tens of milliOhms. (1 milliOhm is 1/1000 Ohm.) Furthermore, if you replace a 50 milliOhm ESR capacitor with a 1 milliOhm ESR capacitor, all you have to do to bring things back to where they were before is add 49 milliOhms of resistance. A piece of thin wire can do that.
There is more to capacitors than just capacitance and ESR. For example, there is stray inductance. Now, the inductance in crossover capacitors is so small that their self-resonance typically falls well above the audio range, but perhaps it shouldn't be neglected. There are other parasitic effects, too, and they must play into this somehow, else all capacitors would sound the same.
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5 minutes ago, Crankysoldermeister said:
If the capacitors you choose bring the midrange and tweeter forward, you will hear less bass.
Well, you'll hear the same bass, but more midrange and treble. But I get your drift.
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4 minutes ago, 001 said:
in an effort to understand this, how does changing 2 caps in the mid/tweet section change the bass freq or output of a speaker?
Playing Devil's Advocate here: In a passive network, everything affects everything else. All of the components interact. Some of the interactions are minor, even negligible. Some are not. One would have to do a full circuit analysis and sensitivity study to quantify the effects.
Personally, I'm skeptical that changing capacitors in the mid/tweet section affects the bass in any significant way. But a full analysis could prove me wrong.
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6 minutes ago, Chief bonehead said:
A 1/4 db over a wide bandwidth can absolutely change the spectral balance.
When dialing-in my biamplified system, I usually adjust the gains in 1/2 dB increments. That's a very small change, and it takes a fair amount of listening time to perceive it.
I'm not sure that I could hear 1/4 dB, but then my hearing's not what it used to be.
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24 minutes ago, ClaudeJ1 said:
Been saying for years, as well as PRACTICING what I preach: ALL Klipsch speakers need subwoofers.
Hofmann's Iron Law -- If you want Klipsch efficiency and 20 Hz, it's got to be big.
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2 minutes ago, Klipschtastic said:
No the static is not related to any knobs. It is a prominent static sound with barely audible music in the background.
In that case, it seems that repairs are in order. Maybe sell them for parts on Craigslist and, after 41 years, treat yourself to some new electronics.
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Unlikely that Cat5 cable will damage the receivers. Is the static present at all times, or only when you move controls? If only when you move controls, then the fix may be as simple as a can of contact cleaner.
DBX Anyone ?
in 2-Channel Home Audio
Posted
I don't know of any. For my system, I use a NUC Windows PC connected to a Steinberg UR824 ADC/DAC, DSP functions programmed under ASIO.