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Crap speaker cables
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Fatmangolf View Drop Down
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    Posted: 15 Feb 2019 at 5:25am
Hi Dave, I got a DM4070 off Amazon, it was about £25 at the time. Basic but does the job I needed, I think it goes down to tens of milliohms on the lowest scale i.e. 0.01. I do take the closed loop reading off when using the test leads.  It's worth remembering that the DC resistance of each speaker crossover inductor will probably be 0.1 ohms or over.

I have found an LCR meter quite handy. To buy one I suggest searching for LCR meter then compare specs to price for the better reviewed models. The materials and construction are as significant as the lumped characteristics IMO.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Dave Friday View Drop Down
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Points: 173 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave Friday Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2019 at 11:49pm
Thanks Jon,as you rightly point out my dvm only reads to 0.1ohm ( how did you know?) so at the very least I need a milli ohm meter,one that reads to 0.000 ohm .
I know I made a capitance meter thingy but I don't know if it did inductance as well ( have to find it )
What LCR meter did you buy?
Ta.
lp12,oc9mk3,ca610p,krimson40watt pa,kef105.4
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Fatmangolf View Drop Down
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Points: 8998 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2019 at 9:13pm
Originally posted by Fatmangolf Fatmangolf wrote:

I agree with Chris on this. Dave, this may not apply and/or may be obvious to you... my multimeter read a bit high on cable resistance so I took the reading with the probes touching off the reading with the speaker cables in circuit. Now I have an LCR meter but multimeters are handy all-in-one tools...



You will not be able to accurately measure the lumped characteristics of a cable with most models of DMM but it will identify a gross fault like a short, open circuit or poor connection. A more specialised device like an LCR meter would be needed to get the measurements Chris rightly suggests for quality speaker cables.
Jon

Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Dave Friday View Drop Down
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Points: 173 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave Friday Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2019 at 2:41pm
One of the quality speaker cable spec is 0.0074 ohm per meter.
I must check the cables in my main system!
One of my co-engineers in a TV rental company was tracing a fault ( frame bounce) with a Avominor meter,when he put the probes in a certain spot the fault stopped so he looked at the ohms per volt on the meter found a resistor of the same value and soldered in place! Job done.
Ps,I had subtracted the .3 ohm 


Edited by Dave Friday - 15 Feb 2019 at 12:07am
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Chris Firth View Drop Down
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Originally posted by Dave Friday Dave Friday wrote:

Hi Chris,the actual loop resistance is .5ohms (for 20 meters)
Here is the spec 1.0mm2  3.0x6.0mm It doesn't make much sense to me!
The cable looks the same as the other(good) cable,I've thrown the thin stuf away.
Ps my meter isn't zeroing!(.3ohm with the prods touching each other )


Subtracting the 0.3 from the 0.5 still leaves 0.2, which is still high in my opinion.
The decimal place could do with being a couple of places to the left.
If things were 0.002Ω I wouldn't bat an eyelid.

I'll have to find my DMM and measure the loop resistance of my speaker cables now.
See what you've started? LOL
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BackinBlack View Drop Down
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Points: 2020 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BackinBlack Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2019 at 8:01am
Modern digital Multimeters rarely show 0 ohms when shorted as they are really measuring the probe, lead and contact resistance. On some models this can be "zeroed out", much like the classic AvoMeter.
Just listen, if it sounds good to you, enjoy it.
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Dave Friday View Drop Down
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Points: 173 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave Friday Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2019 at 9:52pm
Hi Chris,the actual loop resistance is .5ohms (for 20 meters)
Here is the spec 1.0mm2  3.0x6.0mm It doesn't make much sense to me!
The cable looks the same as the other(good) cable,I've thrown the thin stuf away.
Ps my meter isn't zeroing!(.3ohm with the prods touching each other )


Edited by Dave Friday - 14 Feb 2019 at 12:23am
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