Cable Size Clarification |
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shagnasty
Old Croc Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7685 |
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It will do as I made the power a constant to make the point a cable can't ever have a KW rating....
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AJ113
Registered User Joined: 11 March 2016 Location: Hull UK Status: Offline Points: 123 |
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OK understood, but is there a rule for calculating the voltage without knowing the amps?
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kevinmcdonough
Old Croc Joined: 27 June 2005 Location: Glasgow Status: Offline Points: 3749 |
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hey, the problem is two fold in that a) that music isn't a constant source, the amp output constantly varies with the music, and b) the calculation you made is really for electrical safety, in terms of yes the cable can take that amount of current and not go on fire, but what we're more concerned about is sound quality. You need much more copper than is simply electrically safe to ensure that the cable resistance isnt too high and you don't lose too much before it hits the speaker. In general 2.5mm is regarded fine for top speakers, and most people try and go for 4mm for subs. For us, rather than have to deal with lots of different cable sizes we just stick to 4mm across the board. k
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AJ113
Registered User Joined: 11 March 2016 Location: Hull UK Status: Offline Points: 123 |
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OK thank you - I'll check out the 4mm - does anyone have a go-to supplier of speaker cable please ?
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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H07RN-F cable from suppliers like electriccable.co.uk, much much cheaper than "speaker cable"...copper is copper...
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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The main factor in selecting wire is the damping factor for the load impedance, power loss is not an issue.
Maintain a minimum damping factor of 20, include the amplifier output impedance (the inverse of the DF), the wire resistance and the connector resistance. |
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djk
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Steve20131
Registered User Joined: 28 July 2013 Location: Northants Status: Offline Points: 411 |
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Depends on the cable lenth, 1.5mm maybe allright for 2 metres 4mm for 15m. Do an online cable calculator on it and it will tell you how much power you lose. Distance is the important thing and you have to add an extra bit of thickness for capacitance. Maybe keep amps with speakers and have long signal cables, that reduces cables weights, prices + voltage loss ??..
Edited by Steve20131 - 08 April 2016 at 10:10pm |
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AJ113
Registered User Joined: 11 March 2016 Location: Hull UK Status: Offline Points: 123 |
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It's easy to see why powered speakers have become so popular in recent times.
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Dub Specialist Sound
Old Croc Joined: 15 November 2013 Location: Smethwick Status: Offline Points: 4873 |
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for whom not seen it.....
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Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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shagnasty
Old Croc Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7685 |
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yes and no, powered speakers are IMHO a total PITA, running mains and signal everywhere is crap, netrik need to bring out a powercon with a TRS jack in the middle so you can run signal and power through the same connector, this is active speakers/moving lights sorted... Personally I would sooner run speaker level than mains and signal (and data for some systems (why can't they embed the audio in the control stream Soundweb stylee?)) all over the show... |
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AJ113
Registered User Joined: 11 March 2016 Location: Hull UK Status: Offline Points: 123 |
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Plus the amps often shake themselves apart in the bass units, and the cabs are so damned heavy. |
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AJ113
Registered User Joined: 11 March 2016 Location: Hull UK Status: Offline Points: 123 |
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So, my 4mm cable arrived today. The new problem is - it's too big for my speakon connectors.
I'm sure there must be a standard solution to this that most of you employ?
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