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I am having a problem with some hot treble on my current setup. I had to move to new diggs, and lost most of my room treatments. Does a high impedance IC roll off the treble? If it does, why does it physically do that to the sound?
Thanks
Ben
Follow Ups:
The characteristic impedance of a cable has very little direct relationship with it's use as an analog interconnect.However, capacitance, resistance, aand the inductance can all combine to affect the measured frequency response IF the values of these become high enough to actually affect the audio band FR.
Typical cables do not have enough inherent capacitance to attenuate the HF's in the audio band, the one exception is when a cable is paired with a passive "volume contriol", and the very high effective source resistance of the control can work in conjunction with the cable capacitance to roll-off the HF's within the audio band.
This kind of roll-off is usually not a good idea, as it will not really tame room acoustics, but it will blunt transient response and cause a loss of "air".
Create some inexpensive DIY room treatments to get your sound back, see:
The original DIY Acoustic Treatment Note:
http://www.geocities.com/jonrisch/a1.htmand
http://www.geocities.com/jonrisch/a.htm
for all of my acoustics links.
Can you list your equipment? My initial reaction is negative to the use of a cable to attenuate high frequencies.
Van den Hul The First interconnects are made of carbon instead of metal. Their resistance (36 ohms per meter) effectively damps normal-mode and common-mode RF resonances, but might cause problems with control of the load input stage.If you are talking about the effective impedance at RF, then no, higher impedance cables will still suffer from impedance mis-match at the connectors, and still support RF resonances. RF resonances in cables and power cords make the background RF noise worse in many cases.
You should revisit room treatments, as intense and coherent early reflections from walls, ceilings, and floors, cannot be overcome by electrical treatments. Next look at the equipment support. Any opportunity for chatter could cause excessive treble.
Once the room is controlled and the equipment properly supported, any remaining hot treble is likely due to RF noise intermodulation with the audio signal, and your interconnects may be part or all of the problem. However, you can get RF noise into your system from the AC power, the AC safety-earth, and the speaker cables, as well. Which of these is the primary source has to be determined by careful experimentation.
Just out of curiosity, if you want extra resistance or capacitance in a connecting cable, why don't you just solder in a discrete device? That would have the distinct advantage of letting your 1) experiment with different values, and 2) keeping the precise value that gives you the effect you desire.(It is somewhat interesting after all that effort to get tone controls out of high end electronics that we often now use expensive cables on a trial & error basis to alter the frequency balance.)
I don't have lots of soldering experience but for making cables, but I do have access to lots of cable and a multimeter. In general, does a higher impedance cable tame highs? That way I can rule out cable or wire that is low impedance, and not experiment with it.
I know what you mean about tone controls or treble level controls on speakers. I have heard people talk about how they are bad, but when you are in a plaster room with a concrete floor, and can't really change much (I don't own the apartment) they are a lifesaver. I think my next pair of speakers might be Vandersteens just because you can adjust the treble level.
Higher cable capacitance is going to roll off your highs more than impedance (which is what they call resistance for AC signals.) Higher impedance will add another variable to the interaction between the output impedance of your preamp/source and the input impedance of the power amp. That effect will vary with the specific technical details of your equipment. However, IC cables in general don't have much in the way of extra resistance that is important to the circuit. You'll probably see a greater effect from the capacitance (and possibly inductance) issue.
Thanks! I had capacitance mixed up with impedance. I did some research and have found some wire that offers a specific high capacitance and will try that.
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75 ohms and up. Possibly 300 ohm single strand silver.
Hi.Only for digital broadcasting application, we need to worry about cable impedance. AES/EBU specify digital audio cable standard as:
(1) data rate: 3.072 Mb/s
(2) impedance: 110R+/-20%But for analogue audio, impedances vary from 45R - 70R.
How you quote these impedance values? Imagination or hearsay?
Well, I have checked out the Belkin web site, looked at the impedance of some of there cables, and also checked the impedance of some of the wire or cable I have lying around at work with a multimeter. I am going to use the IC for analog audio. What I am trying to figure out is if, in general, the higher the impedance, will the high end be rolled off in the frequency spectrum?
HI.Tell me how you can measure the impedance of a cable with a "multimeter"? What make & model is it?
Thanks for being an ass instead of telling me I was mistaken! I am sure all appreciate your facetiousness when answering their questions instead of explaining their errors. Its too bad that someone like you has to get their jollies off by acting this way on an online message board, who in real life would not dare act this way with a face to face person. I had capacitance and impedance confused, which was pointed out to me, yet you drag this part of the discussion on so you can quietly giggle in front of your computer because you have superior knowledge yet, delight in the mistakes of others so that your own ego can be boosted.
Hi.Everyone makes mistakes. I do. What a big deal. Why go nasty ??
When one ever guoted any data technically, our readers, particularly those technically less previleged, would take it seriously. I just want to make the things right to prevent further misunderstanding due to someone's errors. This is a public forum, please bear in mind.
Since you quoted impedances of an audio IC & further quoted a "multimeter" could measure impedances. What you quoted were pretty news to me. That's why I asked you. It is your job to substantiate whatever you quoted which in good faith I would assure your info were correct.
If you are not sure, why you quoted them. You did not even apologize for such errors, but instead you go nasty on me. What is your problem. Who is showing off its "ego" in the first place, you or me???
Sorry, I am no a lip service guy. I go for facts.
c-J
PS: I am going to address your issues separately for other readers' sake.
So then if you knew that no multi-meter could tell impedance, why not come out and state that? The heavy handed sarcasm in the post is quite enough in a forum where people have such strong opinions on controversial subjects to those in the audiophile community. Your previous posts show extensive knowledge in electronics, so that a multi-meter cannot tell impedance should not be old hat to you.
Why is it not possible for a multimeter to measure impedance?? All one needs is a capacitance range and an inductance one.
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