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Basic speaker cable question
Basic speaker cable question
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Old 23rd January 2019, 09:25 PM   #21
nigelwright7557 is offline nigelwright7557  United Kingdom
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Both wires take same current so need to be same gauge.
If you want an improvement use thicker wires and/or shorter wires.
Shorter or thicker wires (of same material) improve impedance losses.
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Old 23rd January 2019, 09:32 PM   #22
WntrMute2 is offline WntrMute2  United States
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Quote:
Originally Posted by nigelwright7557 View Post
Both wires take same current so need to be same gauge.
If you want an improvement use thicker wires and/or shorter wires.
Shorter or thicker wires (of same material) improve impedance losses.
Are you referring to the unbalanced interconnects I was asking about or the speaker cables the OP was referring to?

If the unbalanced interconnects, then having the same gauge central conductor as the shield would be difficult and certainly not similar in geometry.
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Old 23rd January 2019, 09:41 PM   #23
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by DF96 View Post
The speaker is electrically floating so there is no need for the return connection to be particularly low in impedance.
The speaker cable can pick up RF and feed it back into the amp.
If this goes into the LTP it can get amplified and cause problems.
The input often has a RF filter but the feedback doesn't always have anything.
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Old 24th January 2019, 10:51 AM   #24
DF96 is offline DF96  England
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Both wires of a speaker cable do not need to be the same gauge, but there is no good reason to make them different.

Speaker cables are rarely coaxial, and even when they are this is usually for the wrong reason. A filter in the amp is much cheaper than shielded speaker cables.
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Old 24th January 2019, 11:51 AM   #25
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Moreover, you can combine one wire of copper and another of aluminum, by example, and mix the distortion from both metals equally :-)

Also you can mix the distortion caused by PVC and polyethylene in the insulation of the wire :-)
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Old 24th January 2019, 09:23 PM   #26
AcoustatAnswerMan is offline AcoustatAnswerMan  United States
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Quote:
Originally Posted by kodabmx View Post
+1

"Special" audio and speaker cables are basically snake oil, and most people wouldn't tell the difference between that fancy cable, lamp cord, or barbed wire.

I once contemplated using barbed wire for speaker cable, but the guy at the farm supply store gave me a funny look when I asked if they had it in oxygen free 99.999999999% copper.
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Old 24th January 2019, 09:57 PM   #27
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by Osvaldo de Banfield View Post
Moreover, you can combine one wire of copper and another of aluminum, by example, and mix the distortion from both metals equally :-)

Also you can mix the distortion caused by PVC and polyethylene in the insulation of the wire :-)

Brilliant idea, I think I'll try it .....

What emoticons should have accompanied your affirmations ?

Regards, Osvaldo
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Old 24th January 2019, 10:08 PM   #28
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by AcoustatAnswerMan View Post
I once contemplated using barbed wire for speaker cable, but the guy at the farm supply store gave me a funny look when I asked if they had it in oxygen free 99.999999999% copper.
And he was right
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Old 24th January 2019, 10:11 PM   #29
steveu is offline steveu  United States
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Perhaps if you sink a ground rod at each speaker and one at the amp, you might have a point. But a very important aspect of low impedance connections is the inductance that results from the loop area between conductors, which is why even power lines alternate positions. "Ground" voltage does not magically go to zero. It's more like the water level on the ocean. If you pour current into "ground", the level rises around that point. The exact ground voltage is different than it is a few inches away so you see PCB ground traces running in parallel, not connecting together until they reach a single point ground. It's call avoiding a "ground loop". You may also want to study transmission line theory.

Most expensive speaker wire is bad science, which focuses on DC resistance when what is more important is the transmission line impedance. Marketing is about finding what people think is cool without talking over their head. A good compromise is 4-16 to 4-12 cable with opposite conductors wired together in an X pattern. This cancels most of the inductance.

Last edited by steveu; 24th January 2019 at 10:30 PM.
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Old 25th January 2019, 03:48 AM   #30
PRR is online now PRR  United States
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Quote:
Originally Posted by steveu View Post
Perhaps if you sink a ground rod at each speaker and one at the amp, you might have a point. But a very important aspect of low impedance connections is the inductance that results from the loop area between conductors....
A "ground rod" rarely has less than 50 Ohms resistance.

So going out on the lawn with an 8 Ohm speaker and two dirt-rods will be "a clue": 90% of your power lost in a poor return connection.

Much more than is lost (in audio) by loop inductance. (In my long power line, inductance of twisted-trio cable is a minor correction; even at higher supply frequency or with a typical space-pair it is overwhelmed by simple resistance loss in the metal.)
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