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Speaker wire
Speaker wire
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Old 18th June 2019, 06:31 PM   #31
schiirrn is offline schiirrn  Germany
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Originally Posted by DF96 View Post
I said minimise resistance. This is because most speakers are designed for a voltage source. However, a little resistance does little harm. "Little" means small compared with the speaker nominal impedance. If you have added enough resistance to noticeably change the bass Q then your cable is too long or too thin.

I got that you wrote "minimise". I on the other hand didn't write "bass Q" and didn't mean it.

What if someone wants to change the Q and chooses to do so with a lower gauge wire?
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Old 18th June 2019, 06:33 PM   #32
schiirrn is offline schiirrn  Germany
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Originally Posted by JMFahey View Post
In any case, good speaker designers must consider their cabinets being driven from a Voltage source (your average amplifier out there) plus, say, 0.1 or 0.2 ohms (cable and terminal resistance) in series.
And should not be rendered unusable by, say, 0.5 ohm

Which I bet they do, simply being realistic and designing stuff to be actually *used* in, say, a Living Room or equivalent.

Stuff which only works in a Lab environment but has problems anywhere else does not have much future.

Is this DIYaudio or an online workshop for engineers designing audio gear for Wal Mart?
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Last edited by schiirrn; 18th June 2019 at 06:34 PM. Reason: typo
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Old 18th June 2019, 06:48 PM   #33
DF96 is offline DF96  England
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Originally Posted by schiirrn
I on the other hand didn't write "bass Q" and didn't mean it.
Is there another speaker Q affected by source resistance? The woofer LF responance is the only mechanical resonance with good coupling to the electrical domain.

Quote:
What if someone wants to change the Q and chooses to do so with a lower gauge wire?
They are free to do so in their own music room. However, in most cases the speaker will be designed for a low source impedance and if a higher impedance is needed then the simplest option is to add a resistor in series. Using cables as tone controls seems daft to me!
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Old 18th June 2019, 06:52 PM   #34
cbdb is offline cbdb  Canada
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Originally Posted by Speedskater View Post
Yes twisted pairs. Speaker cables can act as RF interference antennas. The interference sneaks in thru the feedback network to the input stage. It's something that Jim Brown sometimes writes about.
Speaker cable is a terrible antenae and the amp is a large RF load. Any RF that gets past that is usually bypassed before the input stage. Dont care if people write about it, why dont they test it. it would be very easy to test by injecting some RF into a speaker cable and measuring the input. Show me the numbers, not the BS.
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Old 18th June 2019, 07:04 PM   #35
vdi_nenna is offline vdi_nenna  United States
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Speaker wire
I think we are all just looking for the best example of a component without getting robbed. Why will one person pay $80 for a Black Gate when a $5 Nichicon or Elna will do? Don't know.

About those inductor coils, and I'm no electronics wiz, but I don't see a wire coiled up to perform as a component and does a specific job as just a wire. It has different properties than a straight wire. Then again, what do I know?
On the other hand, I've used 30ga Kynar wire wrap wire as speak wire to good effect. Depends on where it's used.

Saw a guy on Youtube this morning make some nice speaker wire from Mogami speaker cables. I don't see these are particularly expensive and Mogami arguably makes good wire.

Mogami W3104 Superflexible High Definition 4 x 12 AWG Speaker Cable 1 ft.

Mogami W3103 Superflexible High Definition 2 x 12 AWG Speaker Cable 1 ft.
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Old 18th June 2019, 07:05 PM   #36
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Still another thread about speakers cable. Puffffff.....
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Old 18th June 2019, 07:07 PM   #37
schiirrn is offline schiirrn  Germany
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Quote:
Originally Posted by DF96 View Post

They are free to do so in their own music room. However, in most cases the speaker will be designed for a low source impedance and if a higher impedance is needed then the simplest option is to add a resistor in series. Using cables as tone controls seems daft to me!

So it makes more sense to use low resistance wire and an additional resistor than just using cheaper wire that comes up with the same resistance as thicker wire plus resistor?
How is one of these variants a "tone control"?
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Old 18th June 2019, 07:11 PM   #38
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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A tone controls works in the electrical part. series resistances works with the damping of the mechanical parts. You cannot modify too much mechanical components, so the action is defined by the speaker and its cabinet. You can change the action of the tone control in multiple ways.
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Old 18th June 2019, 07:13 PM   #39
simon7000 is offline simon7000  United States
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Of course cable has an effect. The only question is how much for a given situation. Attached is a frequency response plot of 100 M of lower than normal inductance loudspeaker cable driving an 8 ohm resistor.

So not surprisingly particular details matter. Now most folks here will never run 100 M of cable. But changes at 20,000 hertz start to be measured at 10 M of cable.

As to RF pickup, this starts to be a big issue with cables approaching 50 M.
Attached Images
File Type: jpg 100 M Frequency Response.jpg (65.4 KB, 132 views)

Last edited by simon7000; 18th June 2019 at 07:15 PM.
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Old 18th June 2019, 07:41 PM   #40
wiseoldtech is offline wiseoldtech  United States
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Quote:
Originally Posted by simon7000 View Post
Of course cable has an effect. The only question is how much for a given situation. Attached is a frequency response plot of 100 M of lower than normal inductance loudspeaker cable driving an 8 ohm resistor.

So not surprisingly particular details matter. Now most folks here will never run 100 M of cable. But changes at 20,000 hertz start to be measured at 10 M of cable.

As to RF pickup, this starts to be a big issue with cables approaching 50 M.

All that is good information, and I'm assuming you're speaking of Meters of wire (M).
I don't know of anyone wanting to use 300 feet of wire to connect speakers of course, so it's a moot point.
In the average living/entertainment room of a residence I'd imagine wire lengths of maybe 20 feet or so - nothing to fuss over with 16 gauge zip cord wire.
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