BiWire Jumpers on biwireable speakers.

[Pim]

I've let my reply go for a few days to try and come up with a way to explain how it is impossible to cause any difference, let alone improvement.

Just like Corona virus deniers, you're a tough bunch but I'll have a go.  Let's do an experiment.

Take some reasonably good quality 75 Ohm coax cable. Get one of those cheap angled plastic capped coax connectors and connect your TV antenna and another coax cable about 1.5m long to it. Both cores under the centre screw and the screens under the clamp. You could try this with RG6, which is great quality, but they're pretty thick so a lesser but reasonable quality cable will do. Now put another connector on the end of the 1.5m cable.

So now we have a loop similar to the + connection in the speaker terminal example. Two connectors, one of them looped, thus a little longer signal path.

Here's a bit of theory you want to keep in mind before doing this experiment; The higher the frequency, the larger the loss of signal in cable. TV reception runs into the MegaHertz, audio into the kiloHertz. So in this experiment we're looking at a ratio of at least 1000:1 for the TV signal to be worse off than the audio signal. On top of that the current and Voltage of the TV signal is much smaller so small changes will show a larger effect. And on top of that we've made the coax cable about 5 times longer than the speaker cable loop.

So I think we can all agree the TV signal has a significant disadvantage to the audio signal.

Now the experiment. You've probably guessed it by now. Connect two TV's up to the two connectors you have in this loop. Check the picture quality. Now reverse the loop between the two TV's and check again. You will find there's no discernible difference in picture quality between the two. It's possible for there to be a difference. You could start with signal that's a bit low in quality to begin with and then the looped end will show a lesser quality.

In the above example it's possible to calculate a loss in signal strength too but, unless there's a problem with the signal in the first place, it will be impossible to notice that drop in signal by looking at the TV's. It's theoretical at best, negligent in practice.

So here we have a loop that has many disadvantages over the audio loop discussed and it shows minimal to no quality difference. None whatsoever if the signal is of good quality (Like the signal from our amplifiers is). 

Now imagine this non existing difference and divide it by 1000, probably more likely 10,000. Now you have some idea of how small a difference we're talking about in audio. 

So, with this experiment in mind, is there still anyone out there who genuinely believes it's possible to create a difference in sound by changing where the loop connects?

So why do people think they do hear a difference? 

The answer to that is the answer to why there are more snake oil products around in the audio industry than there are anywhere else. Dietary supplements might come close. It is because when it comes to audio our brains are easily fooled. 

There's a thread on Stereonet about why on some days you can really enjoy your system and on some days it just doesn't sound right. The conclusions are many; difference in power quality, less outside noise late at night etc. 

But there's also the personal reasons. Mood is one of them. 

That's a big one! 

That means we can 'hear' differently depending on how we feel. So when we feel positively towards a change it's possible for our brains to 'hear' a positive change and if we think negatively we can 'hear' a negative change. On top of that there's the very likely possibility your ears won't be in the exact same spot before and after making a change and on top of that there's our inability to remember audio quality, a very well known phenomenon.

So here we have it. My best (yet) explanation of why changing the direction of a loop doesn't make one iota of a difference in the sound coming from your speakers. If you hear a difference, it's in your head. There's nothing wrong with that. After all, this hobby is about fooling us in the first place; we fool ourselves we can hear a singer right there in the middle in front of us even though we know there's just a couple of speakers on the left and right. We ignore that fact because being fooled feels good. 

Keep fooling yourselves. Just know you're being fooled and all will be good.