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Practical advice on speaker cables please ?



 
 
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  #1 (permalink)  
Old March 6th 06, 05:35 PM posted to uk.rec.audio
Jo
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Posts: 50
Default Practical advice on speaker cables please ?

I'm aware of the never ending discussion on interconnects and speaker
cables, but I just want some advice on what to actually buy. Nominal
impedance of speakers is 6 ohms. Room is quite large and so amp/speaker
distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me. Suggestions
please ?

Jo


  #2 (permalink)  
Old March 6th 06, 05:51 PM posted to uk.rec.audio
harrogate2
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Posts: 71
Default Practical advice on speaker cables please ?


"Jo" wrote in message
...
I'm aware of the never ending discussion on interconnects and

speaker
cables, but I just want some advice on what to actually buy. Nominal
impedance of speakers is 6 ohms. Room is quite large and so

amp/speaker
distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me.

Suggestions
please ?

Jo



Just get a decent thick cable, 2.5mm mains or bigger - or preferably
flex - will do.

You are right, there is much rubbish spoken and snake oil out there,
but given that you have a fairly long run then thicker cable is best
so that it doesn't become significant in the damping factor of the
speaker/amp interface. (Mail me off-net if you want that explained.)


--
Woody

harrogate3 at ntlworld dot com


  #3 (permalink)  
Old March 6th 06, 05:52 PM posted to uk.rec.audio
FJ
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Posts: 3
Default Practical advice on speaker cables please ?


"Jo" schreef in bericht
...
I'm aware of the never ending discussion on interconnects and speaker
cables, but I just want some advice on what to actually buy. Nominal
impedance of speakers is 6 ohms. Room is quite large and so amp/speaker
distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me. Suggestions
please ?

Jo


I would say 6mm2 multistranded would perfectly do the job. I use that on my
Tannoy R2/NAD320i; no problems at all.

YMMV, Folkert/NL


  #4 (permalink)  
Old March 6th 06, 05:53 PM posted to uk.rec.audio
Serge Auckland
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Posts: 509
Default Practical advice on speaker cables please ?


"Jo" wrote in message
...
I'm aware of the never ending discussion on interconnects and speaker
cables, but I just want some advice on what to actually buy. Nominal
impedance of speakers is 6 ohms. Room is quite large and so amp/speaker
distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me. Suggestions
please ?

Jo

Before I went over to active 'speakers, I have used two cables:- QED 79
strand is inexpensive and goes into a banana plug easily. It also solders
well if you want to attach it to spade terminals, or just tin the ends. The
second cable I have used is 30 amp car wiring cable. Available in several
colours, I took two lengths of red and black cable and twisted them together
using a hand-drill. As with the QED cable, it solders well, and, if these
things matter, had an interesting "technical" look about it. I did once try
one of the woven high-capacitance cables, as I got it very cheap, but some
amplifiers (Naim for instance) get upset by the high capacitance, so it's
not of universal application.

Ordinary ring-main cable works well technically, but it is stiff and
difficult to get to lie flat.

By the way, unless you have a specific reason for doing so, bi-wiring is
only a way of getting more copper between your amplifier and 'speakers. It
won't be necessary if the cables are thick enough, even over the 4-5 metre
length you're using.

S.



  #7 (permalink)  
Old March 6th 06, 06:36 PM posted to uk.rec.audio
Jo
external usenet poster
 
Posts: 50
Default Practical advice on speaker cables please ?

In ,
harrogate2 typed:
"Jo" wrote in message
...
I'm aware of the never ending discussion on interconnects and speaker
cables, but I just want some advice on what to actually buy. Nominal
impedance of speakers is 6 ohms. Room is quite large and so
amp/speaker distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me.
Suggestions please ?

Jo



Just get a decent thick cable, 2.5mm mains or bigger - or preferably
flex - will do.

You are right, there is much rubbish spoken and snake oil out there,
but given that you have a fairly long run then thicker cable is best
so that it doesn't become significant in the damping factor of the
speaker/amp interface. (Mail me off-net if you want that explained.)


Thanks, I know about damping factor and the need to keep cable resistance
well below actual speaker impedance across the audio range. I did some rough
calcs and came up with a figure of 3-4 sq mm and was curious about what the
experts here suggested.

Jo


  #8 (permalink)  
Old March 6th 06, 06:36 PM posted to uk.rec.audio
Jo
external usenet poster
 
Posts: 50
Default Practical advice on speaker cables please ?

In ,
Tony Gartshore typed:

I can vouch for the fact that the electrons do manage to struggle
through a five metre length of it.


That made me laugh. Yes, skin effect, grain boundaries, oxygen and other
impurities
notwithstanding, they do make it somehow.

Jo




  #9 (permalink)  
Old March 6th 06, 06:46 PM posted to uk.rec.audio
Roderick Stewart
external usenet poster
 
Posts: 235
Default Practical advice on speaker cables please ?

In article , Jo wrote:
I'm aware of the never ending discussion on interconnects and speaker
cables, but I just want some advice on what to actually buy. Nominal
impedance of speakers is 6 ohms. Room is quite large and so amp/speaker
distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me. Suggestions
please ?


Go to B&Q and buy some of their loudspeaker cable. The copper is nice and
thick, with lots of strands, and easily good enough for 4-5 metres.

Rod.

  #10 (permalink)  
Old March 6th 06, 06:52 PM posted to uk.rec.audio
harrogate2
external usenet poster
 
Posts: 71
Default Practical advice on speaker cables please ?


"Jo" wrote in message
...
In ,
harrogate2 typed:
"Jo" wrote in message
...
I'm aware of the never ending discussion on interconnects and

speaker
cables, but I just want some advice on what to actually buy.

Nominal
impedance of speakers is 6 ohms. Room is quite large and so
amp/speaker distance will be 4-5 meters. Speakers are bi-wired.

I just need an idea of cross-sectional area and where I can get

some
suitable cable. I'm not convinced by the talk of OFC and so on.
Multistranded copper of sufficient thickness is fine by me.
Suggestions please ?

Jo



Just get a decent thick cable, 2.5mm mains or bigger - or

preferably
flex - will do.

You are right, there is much rubbish spoken and snake oil out

there,
but given that you have a fairly long run then thicker cable is

best
so that it doesn't become significant in the damping factor of the
speaker/amp interface. (Mail me off-net if you want that

explained.)


Thanks, I know about damping factor and the need to keep cable

resistance
well below actual speaker impedance across the audio range. I did

some rough
calcs and came up with a figure of 3-4 sq mm and was curious about

what the
experts here suggested.

Jo



It is nothing to do with the speaker load impedence, rather the amp
output impedence.

When the loudspeaker cone is extended by signal, if the signal is
removed then it is down to the mechanics of the cone mount to return
it to its rest position - except that it won't, it will follow a
decaying oscillation path. During this time, as the voicecoil is now
being moved mechanically in a magnetic field it becomes a generator,
so the lower the load that it sees - in this case the output impedence
of the amp plus cable resistance - the quicker the energy will be
dissipated. As an amp output impedence is typically around 0.1R (or
less sometimes) then the resistance of a thinner cable can become
significant, hence why thick is better.

I used to have a pair of BIG transmission line loudspeakers that could
rattle windows at 10 paces with only a few watts! I used 6mm power
cable used in the mobile radio industry (where I work) and they were
more than happy. When we moved to this house I initially couldn't get
under the floor to run the bigger cables so I ran some 0.75mm mains
cable - and the sound was AWFUL!! Bloated flabby bass with
considerable loss of LF detail (amongst other things we like pipe
organ music, the penalty of having a father-in-law who is an
organist!) When I fitted the thicker cable normality was restored.


--
Woody

harrogate3 at ntlworld dot com


 




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