What size cable? - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th March 2007, 08:02 AM   #21
Foxx510 is offline Foxx510  Australia
diyAudio Member
 
Join Date: Nov 2006
I seem to recall reading somewhere that wire gauge on subs has a big effect on damping factor. Not sure if there is any substance to it or not....
  Reply With Quote
Old 28th March 2007, 08:06 AM   #22
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
all speakers that use a selected Q to tailor the low end response will be affected by extra resistance from the source+ connections.
Low end could just as easily apply to a full ranger or a mid/mass or a bass only or a mid only.
__________________
regards Andrew T.
  Reply With Quote
Old 28th March 2007, 11:48 PM   #23
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
Quote:
Originally posted by OzMikeH
just make sure you put the cords in opposite directions, you don't wants the electrons twisting anticlockwise on the way back to the amplifier in the southern hemisphere.

har har har
can even use white and grey cords for polarity.
No, I've found yellow (with blue and red stripes) cords from Bunnings to be really effective. And you can use the red/blue stripes to work out that your cords are running in the right direction.

The secret is to remember which end of the cord you cut which plug off (as the electrons flow from the wall into the other end, don't they?). And the electrons (jumbo ones from big amps) flow from the negative to the positive nodes of the amp. BUT, omigod, when I connect it up in bridged mode I have to use both positive speaker binding posts! What am I to do... ?
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote
Old 29th March 2007, 10:35 AM   #24
OzMikeH is offline OzMikeH  Australia
diyAudio Member
 
Join Date: Mar 2007
I must point out to novices here that he is joking, (I hope - because I was with the clockwise thing)

And to set the record straight the electrons go both ways. Any audio signal is alternating current. (yes, technically it can have a dc offset but this is not a good thing for a speaker)
  Reply With Quote
Old 29th March 2007, 12:13 PM   #25
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
even our novices know that electrons go in all directions (was it Brown? or was he on about gases?) and not just when AC flows.
It's the general drift that is seen as current flow and it's the drift in alternating directions that we interpret as AC.
Just to compound it the drift in a particular direction is negative flow.
And then we go and reverse it into our conventional current flow.
Stupid us (we expect novices to learn this!!).
__________________
regards Andrew T.
  Reply With Quote
Old 30th March 2007, 01:08 AM   #26
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
I must apologise also. Even though this is not a DIY amplifier we are talking about, the voltages and amperages (?is that a word?) that it can generate could be uncomfortable, if not down-right dangerous.

I do not wish to contribute to the Darwin awards, even if inadvertantly.

Don't worry, Mike, I know just enought to keep knitting needles out of the sockets in the wall - and that jumbo electrons go any damn way they want to!
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote
Old 30th March 2007, 01:30 AM   #27
diyAudio Member
 
Join Date: Aug 2006
Oh dont forget the impossibility and importance of oxygen free cables!!!!!! We dont want those jumbo electrons to breath!!!!!! Its way better for them to hold there breath from the amp to the driver. Otherwise they might slow down or decide to live and build homes and then breed inside the cable!!!!!!
  Reply With Quote
Old 30th March 2007, 01:33 AM   #28
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
Quote:
Originally posted by Cameron Glendin
Otherwise they might slow down or decide to live and build homes and then breed inside the cable!!!!!!
Will I need breeder resistors to stop them doing that ?
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote
Old 30th March 2007, 05:34 AM   #29
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally posted by Cloth Ears

FYI on this amp/subwoofer, I am expecting a total of about 6 feet of cable total. 18 inches to the first terminal, 18 inches connecting the 2 drivers (in series), 36 inches back from the second driver to the amp.

When I do 2 runs of cable, it subtracts 3 from the AWG rating, doesn't it? So, 2 runs of 16, gives 13, and 4 runs of 16 gives 10. that's right, isn't it?
Greets!

Power wire runs are all about voltage drop (Vd) over distance, so for such a short run/11 ohms/~1453 W (based on 34 dB gain) with fractional Vd you only need ~2979 CM, or 15 ga. if copper, so anything bigger is essentially wasted, though of course it doesn't hurt performance in a sub app. Anyway, the terminations are typically the weak link in high power transient situations, with cold weld (properly crimped) connections to ring tongue connectors for stud or screw mounting being preferred over typical consumer speaker connectors.

Plenty close enough.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 30th March 2007, 05:58 AM   #30
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
Thanks GM.

How did you come by the figures - or is it a trade secret?
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone using microphone cable in making their phono cable? rich121 Analog Line Level 8 10th September 2010 12:50 AM
cheap cat5e cable for speaker cable fishline Full Range 6 19th May 2009 07:42 PM
New in package Component Video Cable and Toslink Cable for sale cheap jainbaby Swap Meet 1 30th December 2007 05:18 PM
problems with speaker cable as power cable pjpoes Parts 11 14th January 2007 08:24 PM
Speaker size v Room size cliffy Multi-Way 6 19th February 2005 08:34 AM


New To Site? Need Help?

All times are GMT. The time now is 06:37 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2