Does anyone use a different cable for the neg run?

I have to restate the fact that I've tried different neg return runs,one was a Goertz type flat pair of speaker wires and the sound was inferior to the 2 runs of solid core 12 guage romex.
So in my real world what is used for the return does matter, and perhaps more so than the signal runs.

I know, it flies in face of all audio wisdom, we've been brainwashed to always think in terms of using identical speaker wires for neg and pos.

But as I found out before I tried this experiment,all that the neg run is, is a ground.I may try grounding elsewhere than at the amp.

From my observations, the better the ground the better the sound.

Perhaps I wasn't clear on what I am doing or perhaps it's the old ways die hard of audio truths, but it's simple.

You take one run of speaker wire, I use Nordost Heimdal.
Bananas on all ends.

I put the red(pos)banana into the top red (pos) speaker terminal and the black(return)into the lower red(pos speaker terminal.

At the amp end,one banana goes into the DEcWare top binding post hole, the second (ret,black) into the pos hole on the side of the 5 way terminal,the part where a bare wire would be inserted.

So you have the two pos (red) speaker terminals filled with one red and one black Nordost banana from a single run of Nordost(non bi wired )speaker cable,The other red and black Nordost bananas are summed at the red pos amp post.So thats on run of cable just to both of the pos speaker posts and the other end of the wire(pos and neg)to just the pos amp binding post.

The return runs, using 12 guage solid core, are terminated as follows.
One single 12 guage wire to the top black speaker binding post, and another single wire to the bottom neg speaker terminal, both wires summed at the amps Neg (black) binding post.

As usual the other speaker and the other side of the amp follow suit.

Again, what intrigues me is that the difference in sound has everything to do with the return run.

Change it and the sound suffers.
Opting for one single wire on the return wasn't as full sounding, and neither was a full set of copper flatline type of speaker wires used as the return or neg runs.

I thought this similar to Nordost speaker wire set up would sound the best.It was double runs using two complete sets of speaker wires.

But it wasn't, the sound lacked the detail retrieval and weight that the solid core 12 guage brought to the party.

I know it sounds strange to most, I am still trying to figure out why, hence my post,but from my side of the fence listening to the changes, I have to say that the neg return has more of an influence on the sound than I ever thought it did.

Just speculation on my part, but perhaps the thicker return wire that I am using allows more of the grunge to flow out of the gear and back to ground.

More conventional wiring schemes where all wires are equal send less grunge back to ground, and so we hear more of it's effect masking the music.

The increase in inner detail with the thicker neg returns, the cleaning up of the sound, leads me to make this observation.

I used the Love cd to really get a grip on this.
I settled for the 2 return runs of romex per speaker because more of the cd's sound effects and song mixes were easier to pick out than with any of the other configurations, including my intial use of a set of Heimdals and Norse jumpers.

I should add that minor ticks and pops in vinyl were less thin sounding , there was less hash to older less pristine recordings in my collection.Cymbals took on more shimmer and had a weightier sound.You could hear more wood sound from sticks hitting cymbals.

I wish I could say that the improvement in sound was simply the dobling up of the Nordost on the pos terminals.That would be easy for all to understand, as it only makes sense.

What doesn't make sense, until you hear it, is why there is so much difference in sound when you start fooling around with the neg return runs of speaker wire.

Again I can only speculate why, and so far no one else has come up with an answer.

I may try grounding elsewhere than at the amp.

No, don't do that. The return current from the speaker will want to find its way back to the circuit ground of the amp, and the consequences of that will not be good.

If you connect the negative speaker leads to the ground of a different component in the system, the return path that will be taken to the amp will be through interconnect cables. That will result in crosstalk between that large return current and the low level signal return currents the interconnects normally carry. Also, the interconnects aren't designed to carry high current. I'm not sure exactly what the net result would be, but I would expect that at best it would be a sonic mess, and at worst there would be a feedback-induced oscillation resulting in damage to the system and to your ears.

If you connect the negative speaker leads to an AC safety ground point instead, the consequences would depend on the internal grounding configuration of the amp and the component it is connected to, but I would not expect that to be healthy either.

Regarding the reasons for the sonic benefits you have noted from the cabling arrangement you are presently using, what you are doing is increasing the inductance of the runs. Putting the same signal through two conductors that are physically joined and in close proximity will result in a higher inductance than having those conductors conducting the same current but in opposite directions (i.e., one conducting signal, the other signal return). Also, a run of Romex inherently has much higher inductance than a run of Nordost of the same length. Also, although it is not particularly relevant to your present configuration, increasing the spacing between conductors carrying signal and return currents will result in increased inductance.

The net effect of increased inductance will be to attenuate the extreme upper treble to a slight degree. Exactly how much will depend on the impedance vs. frequency characteristics of the particular speakers, particularly in the upper treble region.

The results were positive,and the increase in detail, less hash, and more rounded full body images has made a believer out of me.

A slight rolloff in the extreme upper treble region, resulting from increased cable inductance, would seem consistent with a perception of greater body and less hash. Perhaps the increase in perceived detail goes hand in hand with there being less hash.

If you haven't already tried it, btw, an interesting experiment would be to interchange what you are doing with the positive and negative runs, i.e., use the Romex runs for the positive connections, and the Nordhost for the negative connections. I wouldn't be surprised if there isn't much difference from the results you are getting now. I would imagine that a difference would be most likely to occur if a solid state amplifier having both wide bandwidth and a feedback loop were being used, due to differences in the amount of rfi pickup in the cables that might enter the feedback loop.

Regards,
-- Al

Thanks Almarg, I'll switch the cables around and give it a go.

I had contemplated using longer runs of my Romex return wires and running them directly to my panels ground wire, not hard to do as my panel is in my listening room.

This way all grunge would bypass the amplification chain and go right to ground at the panel.
My amp will not self destruct if the speaker wires are disconnected.
If I feel brave in the near future I may try this experiment, but for now I am very pleased with the results of my last"too much time on his hands"experiments.

One thing that has crossed my mind in all of this ,are the add on ground link connectors and the posts from those who find these are an improvement.

The ones that you only add to the neg return of your speakers.

The return to ground as far as I am concerned is a little more complicated than I had always believed it to be and not to be taken for granted.

It plays a bigger role in the final sound of the system that I ever believed it did.

I had contemplated using longer runs of my Romex return wires and running them directly to my panels ground wire, not hard to do as my panel is in my listening room.

This way all grunge would bypass the amplification chain and go right to ground at the panel.
My amp will not self destruct if the speaker wires are disconnected.
If I feel brave in the near future I may try this experiment ...

No, once again I strongly recommend against doing that. What happens when the speaker wires are disconnected from the amplifier has no relevance to what I am saying.

Keep in mind that electric current only flows if there is a complete circuit, from the source to the load and back to the source (the amplifier being the source, in this context). The same amount of current that goes out to the load needs to (and will) come back to the source, regardless of whatever grunge may be riding on it.

In the situation you are considering, the complete circuit would be from the + terminal of the amp to the + terminal of the speaker, then from the - terminal of the speaker to the ground at the panel, then through the AC safety ground wiring to the system, and then via unpredictable paths through the system to the circuit ground of the amp.

If the amp has its AC safety ground and its circuit ground connected directly together, that would be the path the return current would take. What that would amount to is connecting the AC safety ground wiring between the amp and the panel, as well as the wiring from the speaker to the panel, in between (in series with) the connection of the amp to the speaker. At best, that will degrade sonics considerably. But the effects may be much worse than that.

If the amp connects its AC safety ground to its circuit ground via a passive component (a resistor, inductor, or capacitor), and some other component in the system has its circuit ground and AC safety ground connected directly together, or connected together via a lower impedance than in the amp, then most of the return current would find its way back to the amp via that or those other components and their interconnections. Which could very conceivably result in oscillations and/or damage, as I previously indicated.

Regards,
-- Al