Speakerplans.com Homepage
Forum Home Forum Home > General > Newbie Discussion
  New Posts New Posts RSS Feed - Speaker cable diameter
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Speaker cable diameter

 Post Reply Post Reply
Author
Message
dj jammin View Drop Down
Young Croc
Young Croc
Avatar

Joined: 10 April 2010
Location: southampton
Status: Offline
Points: 609
Post Options Post Options   Thanks (0) Thanks(0)   Quote dj jammin Quote  Post ReplyReply Direct Link To This Post Topic: Speaker cable diameter
    Posted: 06 April 2015 at 8:31pm
I know there's been lots of discussions about this before but I somehow can't find any old threads to read. I know someone once posted a chart showing the loss in different length and diameter cable at 8 / 4 / 2 ohm loads. 

Can anyone point me to the topic or give the basic theory of deciding cable thickness for 20m runs at 4/8 ohms ..

Thanks


Reverence Sound system
www.mixcloud.com/B1_Jams/

Back to Top
app View Drop Down
Old Croc
Old Croc


Joined: 26 December 2013
Location: Finland
Status: Offline
Points: 2435
Post Options Post Options   Thanks (0) Thanks(0)   Quote app Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 8:37pm
"what!?"
Back to Top
app View Drop Down
Old Croc
Old Croc


Joined: 26 December 2013
Location: Finland
Status: Offline
Points: 2435
Post Options Post Options   Thanks (0) Thanks(0)   Quote app Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 8:38pm
Maximum wire lengths for two conductor copper wire[4]
Wire size 2 Ω load 4 Ω load 6 Ω load 8 Ω load
22 AWG (0.326 mm2) 3 ft (0.9 m) 6 ft (1.8 m) 9 ft (2.7 m) 12 ft (3.6 m)
20 AWG (0.518 mm2) 5 ft (1.5 m) 10 ft (3 m) 15 ft (4.5 m) 20 ft (6 m)
18 AWG (0.823 mm2) 8 ft (2.4 m) 16 ft (4.9 m) 24 ft (7.3 m) 32 ft (9.7 m)
16 AWG (1.31 mm2) 12 ft (3.6 m) 24 ft (7.3 m) 36 ft (11 m) 48 ft (15 m)
14 AWG (2.08 mm2) 20 ft (6.1 m) 40 ft (12 m) 60 ft (18 m)* 80 ft (24 m)*
12 AWG (3.31 mm2) 30 ft (9.1 m) 60 ft (18 m)* 90 ft (27 m)* 120 ft (36 m)*
10 AWG (5.26 mm2) 50 ft (15 m) 100 ft (30 m)* 150 ft (46 m)* 200 ft (61 m)*
"what!?"
Back to Top
Dub Specialist Sound View Drop Down
Old Croc
Old Croc
Avatar

Joined: 15 November 2013
Location: Smethwick
Status: Offline
Points: 4526
Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 9:04pm
Is it the Crest one yu after here,



Edited by Dub Specialist Sound - 06 April 2015 at 9:12pm
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...
Back to Top
dj jammin View Drop Down
Young Croc
Young Croc
Avatar

Joined: 10 April 2010
Location: southampton
Status: Offline
Points: 609
Post Options Post Options   Thanks (0) Thanks(0)   Quote dj jammin Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 9:23pm
Thats the one Thumbs Up thanks for the help chaps...

Reverence Sound system
www.mixcloud.com/B1_Jams/

Back to Top
shagnasty View Drop Down
Old Croc
Old Croc


Joined: 30 July 2007
Location: Guildford, UK
Status: Offline
Points: 7680
Post Options Post Options   Thanks (0) Thanks(0)   Quote shagnasty Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 9:29pm
Pity the above link isn't working, I have posted the same on here, I've a few post, prob worth just checking them all...
 
What you'll rapidly find is :-
 
Use CSA (cross sectional area) in the UK we use 1.5mm2, 2.5mm2 and 4mm2 as descriptors for cabling, AWG is a Sepo thing and actual diameter is just bloody useless!
 
get you head into mm2 per driver space, 4 runs of 20m 1.5mm feeding 4 hogs @1500W/8r is a lot better than 1 4mm run feeding 4 hogs @6000W/2r!!!
 
that said, we don't really use 1.5mm for PA, it is fine for top drivers, but unless you want to play different types of lead for HF and the rest you are better off just using 2.5m or bigger.
 
depending of your rig layout, mine uses NL8 for PA and I run out to the stacks on 4mm and link with 2.5mm, mons are all NL4 bi-amp on 4g2.5, but if you have nl4s on all your cabs consider just using 4g2.5mm for everything, you can short 1+<>1-, 2+<>2- for heavy bins to give you 5mm for higher power, if you do use NL4 all round, make bloody sure to label your shit up well, in a SUB,Kik,Mid,Hi  system coloured coded looms (just tape 4 NL4 cables together) with like Brown for Sub, Red for Kik, Orange for Mid and yellow for Hi, use 1 band of brown, 2 of red, 3 of orange etc so in crap light you can still see and put coloured paint patches on the boxes so "helpers" can get it right..
 
if you can void linking 18s below 4r, a patch panel on your amp rack and 2 runs of cable is better than a single run @ 2r!
 
if you must use 2 core cable use NL2FX connectors, Never put an NL2MP on a box as NL4s can't mate with it, but an NL2 can mate with an NL4!!!
 
One the subject, don't bother with anything more than 2.5mm on driver wiring in boxes, soldering 2x4mm to a tag is a pain and the difference between 4 and 2.5mm over the distance in a cab can't hardly be measured, let alone heard!
 
 
Link now Happy!!!!! xx


Edited by shagnasty - 06 April 2015 at 9:29pm
Back to Top
dj jammin View Drop Down
Young Croc
Young Croc
Avatar

Joined: 10 April 2010
Location: southampton
Status: Offline
Points: 609
Post Options Post Options   Thanks (0) Thanks(0)   Quote dj jammin Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 9:52pm
Thanks very much for the advice..

One thing I was wondering, Im thinking about running four low-mid drivers series/parallel so 4 times 400w drivers = 1600w @ 8ohm

Would you recommend say 4mm2 due to high wattage? Or is it only ohms we need to look at?
Reverence Sound system
www.mixcloud.com/B1_Jams/

Back to Top
app View Drop Down
Old Croc
Old Croc


Joined: 26 December 2013
Location: Finland
Status: Offline
Points: 2435
Post Options Post Options   Thanks (0) Thanks(0)   Quote app Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 9:57pm
I used 4mm for everything...
"what!?"
Back to Top
shagnasty View Drop Down
Old Croc
Old Croc


Joined: 30 July 2007
Location: Guildford, UK
Status: Offline
Points: 7680
Post Options Post Options   Thanks (0) Thanks(0)   Quote shagnasty Quote  Post ReplyReply Direct Link To This Post Posted: 06 April 2015 at 10:14pm
Originally posted by dj jammin dj jammin wrote:

Thanks very much for the advice..

One thing I was wondering, Im thinking about running four low-mid drivers series/parallel so 4 times 400w drivers = 1600w @ 8ohm

Would you recommend say 4mm2 due to high wattage? Or is it only ohms we need to look at?
 
@ 20M you will loose 3% (ish) @ 2G5 and 2% (ish) @4G, so I wouldn't worry, the above data show impendence is the killer for power loss not CSA so much...
 
1600 @ 8r that is some mid amp you have!!Smile
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.078 seconds.