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 Post subject: Re: Suppliers DIY Cables
PostPosted: Sat Dec 29, 2012 8:23 am 
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Location: BOWMANVILLE, ON, CA
Just wondering. The inner core of these cables is not 75 ohm. The resistance of these cables is relative to the copper used not the design. Have you ever used a simple meter to check the resistance of the copper core?

I was told by those in the industry to use these cables as they are used by audio studios and other communication. It’s all about the shielding. We are talking about 20 Hz to 20 kHz and low voltage signals........

http://www.avsforum.com/t/819852/need-100-ft-subwoofer-cable-would-normal-rca-cable-do/30

Just trying to help those who are a budget. Just curious as what is the inner core guage of most rca cables 22 guage or less

ah secrets of trade.


Last edited by willie1959 on Sat Dec 29, 2012 9:22 am, edited 1 time in total.

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 Post subject: Re: Suppliers DIY Cables
PostPosted: Sat Dec 29, 2012 9:20 am 
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willie1959 wrote:
Just wondering. The inner core of these cables is not 75 ohm. The resistance of these cables is relative to the copper used not the design. Have you ever used a simple meter to check the resistance of the copper core?

I was told by those in the industry to use these cables as they are used by audio studios and other communication. It’s all about the shielding. We are talking about 20 Hz to 20 kHz and low voltage signals........


Impedance, not resistance. Fundemental difference between the 2 concepts, even though they both use the same unit of measure (ohms). Just as potentially confusing as the concept of ounces (weight) and ounces (liquid or solid quantity) in the Imperial measurement system. You should read up on the subject if you don't grasp the difference between the 2; many people do not.

RG-6 and RG-59 are designed to work optimally with signals in the MHz range and terminated into a 75 ohm impedance, not at audio frequencies. Conversely, audio cables are designed to operate optimally with signals in the audio frequency range and respond very poorly to Radio Communications Frequencies and Video signals. A simple meter can only tell you the DC resistance (at zero Hz) of a cable and nothing about its linear frequency response range or termination impedance. Shielding is only one of many considerations whem dealing with audio interconnects and some of the finest, high end interconnects do away with shielding alltogether.

So, yes, RG-6 or RG-59 WILL conduct electrical signals at audio frequencies; just not as well or linearly as audio rated cables will.


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Sat Dec 29, 2012 9:31 am 
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Location: Ottawa, ON, CA
willie1959 wrote:
Has anybody used RG59 (inner core 20 guage) or RG6 (inner core 18 guage) like cables before . I have used these cables for years they are much cheaper and the RCA ends are cheap on ebay. Just bought 24 ends for $11.00. There are many different grades of these cables. I use the solid copper core cables. I have used these cables for sub woofer cables , inter connects and speaker cables. Due to the superior shielding, they eliminate hum.

Just wondering.



http://www.echoloft.com/articles/belden ... nnects.htm

I don't know the alloy used in the Belden cables
however, for all your time and efforts, I would suggest using cable with a high quality copper and or silver.

As for RCA's I would suggest looking for gold plated ones with a high copper content.
I'm not up solid state physics - nor do I want to be - however, for some reason,
connectors made with a copper content alloy sound much better than those made from brass or bronze.

For solder Cardas Quad is very easy to work with and requires only a basic 25 watt iron.


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Sat Dec 29, 2012 9:53 am 
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Location: BOWMANVILLE, ON, CA
Yes I had a problem with AC hum and interference years ago with a system. I corrected it by replacing the RCA cables with a Wang communication cable that was two RG59 cables together with a copper shielding. This was used for line level signals not the audio cables. In my new systems I use a high grade RG6 like cable that uses a solid copper core 18 gauge, we cannot get RG11 anymore. This RG6 like cable is used for medical equipment where no signal loss can be tolerated plus the shielding is superior in keeping unwanted signals out. That’s what the shielding is about at line level. Yes I know all about Belden cables, people just don’t know that they can buy this cable directly through an electrical suppler a lot cheaper and make their own cables, such as Westburne ect.

Somebody has to have made this cable at the wholesale level without any markup.

I have seen some people spend thousands of dollars for cables that can be bought from Belden cable for dollars per foot.
I will list the cables from Belden .

http://www.belden.com/products/enterprisecabling/audio-video-solutions.cfm

http://www.broadbandutopia.com/belden7915a.html

http://www.tselectronic.com/shop/product/Belden-7916A-RG6-U-Duobond-IV-3GHz-RG6-U-Quad-Shield-Broadband-Coax/216

http://belden.com/docs/upload/Headend-Brochure-Headend-Brochure.pdf

Buy solid 18 guage copper cores for rg6 to be used for line level only not audio. NOTE: loss per 1000 feet is 6.3 ohms.


I am a cheepee but I do enjoy my audio systems.


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Tue Oct 29, 2013 6:42 am 
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Location: Pointe-Claire, QC, CA
Does anybody know where I can find a few meters of bulk Mogami 2972 speaker wire? Takefive does not carry this specific wire.


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 Post subject: Re:
PostPosted: Mon Dec 23, 2013 12:56 pm 
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Location: Thornton, ON, CA
ktuuri wrote:
Take Five has some very good products for anyone into doing some DIY.
I have dealt with them numerous times and the service is first rate, and fast.
A great number of brands they carry.

http://www.takefiveaudio.com/mall/shopd ... Y+Supplies


+1 for take five audio, just received xlr interconnects, constructed, cryogenic, and burned in...and yet not sky high pricing.

Just get Gene to build whatever you need - my two cents.

Cheers


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Mon Dec 23, 2013 2:51 pm 
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In The Vancouver Area I Use Radial Engineering and Texcan/Sonepar


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Sat Apr 19, 2014 4:58 pm 
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Location: Ingersoll, ON, CA
I recently picked up a pair of red 3M Van Damme XLR cables with gold plated Neutrik plugs.
The writing on the cable is:
Van Damme Tour Grade Classic XKE Microphone cable 268-022-020 Ultra Pure Silver Plated OFC.
I have yet to try this stuff. Has anyone here tried it?
All I can find is that it seems to be good pro cable. Not too sure how it would be on a home system.

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 Post subject: Re: Suppliers DIY Cables
PostPosted: Sat Jul 09, 2016 5:32 pm 
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Location: New Westminster, BC, CA
OBI56 wrote:
willie1959 wrote:
Just wondering. The inner core of these cables is not 75 ohm. The resistance of these cables is relative to the copper used not the design. Have you ever used a simple meter to check the resistance of the copper core?

I was told by those in the industry to use these cables as they are used by audio studios and other communication. It’s all about the shielding. We are talking about 20 Hz to 20 kHz and low voltage signals........


Impedance, not resistance. Fundemental difference between the 2 concepts, even though they both use the same unit of measure (ohms). Just as potentially confusing as the concept of ounces (weight) and ounces (liquid or solid quantity) in the Imperial measurement system. You should read up on the subject if you don't grasp the difference between the 2; many people do not.

RG-6 and RG-59 are designed to work optimally with signals in the MHz range and terminated into a 75 ohm impedance, not at audio frequencies. Conversely, audio cables are designed to operate optimally with signals in the audio frequency range and respond very poorly to Radio Communications Frequencies and Video signals. A simple meter can only tell you the DC resistance (at zero Hz) of a cable and nothing about its linear frequency response range or termination impedance. Shielding is only one of many considerations whem dealing with audio interconnects and some of the finest, high end interconnects do away with shielding alltogether.

So, yes, RG-6 or RG-59 WILL conduct electrical signals at audio frequencies; just not as well or linearly as audio rated cables will.



Resistance is futile :roll:


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Wed Jun 21, 2017 2:03 pm 
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Location: Mississauga, ON, CA
OBI56 wrote:
willie1959 wrote:
Impedance, not resistance. Fundemental difference between the 2 concepts, even though they both use the same unit of measure (ohms). Just as potentially confusing as the concept of ounces (weight) and ounces (liquid or solid quantity) in the Imperial measurement system. You should read up on the subject if you don't grasp the difference between the 2; many people do not.
.

Hi OB, do you have any links re impedance vs resistance? Love to learn more...


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Wed Jun 21, 2017 2:36 pm 
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http://www.bluejeanscable.com/articles/impedance.htm

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 Post subject: Re: Suppliers DIY Cables
PostPosted: Wed Jun 21, 2017 4:57 pm 
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ripblade wrote:
http://www.bluejeanscable.com/articles/impedance.htm

Thanks for the link, unfortunately there's no ref re impedance vs resistance


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Wed Jun 21, 2017 5:04 pm 
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Bandy wrote:
ripblade wrote:
http://www.bluejeanscable.com/articles/impedance.htm

Thanks for the link, unfortunately there's no ref re impedance vs resistance

Guess I answered the wrong question lol.

Try this one: http://cablesondemandblog.com/wordpress ... ial-cable/

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 Post subject: Re: Suppliers DIY Cables
PostPosted: Thu Jun 22, 2017 11:48 am 
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ripblade wrote:
Bandy wrote:
ripblade wrote:
http://www.bluejeanscable.com/articles/impedance.htm

Thanks for the link, unfortunately there's no ref re impedance vs resistance

Guess I answered the wrong question lol.

Try this one: http://cablesondemandblog.com/wordpress ... ial-cable/


Ripblade, thx for the link, for others interested, in a scoop:
"..... AC or Alternating Current through a circuit, we are no longer measuring resistance, we are measuring impedance."
So DC measurements=resistance, AC measurements=impedance.
However from my experience the 2 terms are very often used interchangeably.


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 Post subject: Re: Suppliers DIY Cables
PostPosted: Thu Jun 22, 2017 12:00 pm 
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Location: toronto, ON, CA
https://teletechproaudio.com/


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