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Author Topic: 4 conductor cabling on dual 18 subs  (Read 3256 times)

Michael Mills

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4 conductor cabling on dual 18 subs
« on: March 22, 2023, 06:20:03 AM »

Is it worth the expense and to go with 4 conductor cables to each sub box, example...jbl 828s in discrete vs a 2 wire in parallel?
How does it relate to damping,  ie. Each speaker in each box cabled back independently via (4 wire) only to have both pair terminate on the same output of the amp to achieve a 4 ohm load
« Last Edit: March 23, 2023, 12:57:14 AM by Michael Mills »
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Brian Jojade

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Re: 4 conductor cabling on dual 18 subs
« Reply #1 on: March 22, 2023, 07:45:49 AM »

Is it worth the expense and to go with 4 conductor cables to each sub box, example...jbl 828s in discrete vs a 2 wire in parallel?
How does it relate to damping,  ie. Each speaker in each bow cabled back independently via (4 wire) only to have both pair terminate on the same output of the amp to achieve a 4 ohm load

If you have 4 conductors vs 2 and they are all the same gauge, more conductors would mean more copper and thus less loss in the line.  In real world scenarios, unless you're running undersized wire or very long distances, you're going to be hard pressed to end up with an audible difference.
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Steve-White

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Re: 4 conductor cabling on dual 18 subs
« Reply #2 on: March 22, 2023, 08:12:51 AM »

If you have 4 conductors vs 2 and they are all the same gauge, more conductors would mean more copper and thus less loss in the line.  In real world scenarios, unless you're running undersized wire or very long distances, you're going to be hard pressed to end up with an audible difference.

+1

In practical application, it doesn't matter.  If making 100' runs from the amp, then it's worth consideration.
« Last Edit: March 22, 2023, 09:51:16 AM by Steve-White »
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Nathan Riddle

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Re: 4 conductor cabling on dual 18 subs
« Reply #3 on: March 22, 2023, 09:47:24 AM »

Michael,

You may enjoy this calculator for determining all of the various variables.
https://products.electrovoice.com/na/en/cableloss

And a paper on damping factor:
https://linea-research.co.uk/wp-content/uploads/LR%20Download%20Assets/Tech%20Docs/Damping%20factor%20debunked%20-01a.pdf

GLHF!

In practical application, it doesn't matter.  If making 100" runs from the amp, then it's worth consideration.

I think you mean 100ft  ;D
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Michael Mills

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Re: 4 conductor cabling on dual 18 subs
« Reply #4 on: March 23, 2023, 01:07:54 AM »

If you have 4 conductors vs 2 and they are all the same gauge, more conductors would mean more copper and thus less loss in the line.  In real world scenarios, unless you're running undersized wire or very long distances, you're going to be hard pressed to end up with an audible difference.
Yes all conductors are same size, 11/4 cable with NL4 on box end and 1 binding post with both pair on amp side. Amps are Crown MA 2500 bridged, with 1 amp per box. Cables are 50'
4 sub boxes and 4 amps.
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Caleb Dueck

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Re: 4 conductor cabling on dual 18 subs
« Reply #5 on: March 23, 2023, 04:50:15 PM »

Amps are Crown MA 2500 bridged, with 1 amp per box. Cables are 50'
4 sub boxes and 4 amps.

The main benefit to using 4 conductor cable, besides higher damping factor, is that you can use one amp channel per driver rather than one per sub.  Especially if it's a 4 ohm sub (dual 8 ohm drivers), each amp channel will run at 8 ohms rather than 2 ohms.  Even though the power to the sub looks lower on paper, look at amp output vs time graphs, as that along with higher damping will help it perform better overall. 

I'd say go for it, as long as it addresses the amps as well.
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Steve-White

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Re: 4 conductor cabling on dual 18 subs
« Reply #6 on: March 23, 2023, 08:38:10 PM »

I'd be inclined to look at the numbers for 4x 14ga - not so sure you want to bridge those amps into a 4 ohm load.  With one amp per pair of 18's I'd go dual channel to the drivers with independent runs to them from the amps.
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Matt Vivlamore

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Re: 4 conductor cabling on dual 18 subs
« Reply #7 on: March 30, 2023, 11:05:35 AM »

Is it worth the expense and to go with 4 conductor cables to each sub box, example...jbl 828s in discrete vs a 2 wire in parallel?

The switch on the back of the SRX828S, isn't the same as the old SRX47## series.  The switch allows you change from Pins 1 to Pins 2.

What can do is run NL4-4C into the 828 (switched to Pins2) and then Link up to your mains with jumper (Pins1).  I did this when I had my SRX7## system and it worked out great.
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Caleb Dueck

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Re: 4 conductor cabling on dual 18 subs
« Reply #8 on: March 30, 2023, 02:54:17 PM »

The switch on the back of the SRX828S, isn't the same as the old SRX47## series.  The switch allows you change from Pins 1 to Pins 2.

What can do is run NL4-4C into the 828 (switched to Pins2) and then Link up to your mains with jumper (Pins1).  I did this when I had my SRX7## system and it worked out great.

It's a simple internal rewire to have pins 1 to one driver and pins 2 to the other. 
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Tim Weaver

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Re: 4 conductor cabling on dual 18 subs
« Reply #9 on: April 24, 2023, 10:45:57 AM »

I'd be inclined to look at the numbers for 4x 14ga - not so sure you want to bridge those amps into a 4 ohm load.  With one amp per pair of 18's I'd go dual channel to the drivers with independent runs to them from the amps.

This.

We have been running 4 conductors on subs for years so that each driver gets powered discretely. The benefit gets better when you have multiple dual 18's and you never know how many you are going to use that day. If you out out 3/side with the standard wiring you'll have a 2 ohm load and a 4 ohm load, but with the discrete wiring both loads would be 2.6 ohm. You'll get a balanced load on your amp (and distro, depending how its wired) by using the discrete wiring.
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Re: 4 conductor cabling on dual 18 subs
« Reply #9 on: April 24, 2023, 10:45:57 AM »


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