I read this article by Doug Schroeder and was a bit dubious but thought I'd give it a go.

https://www.dagogo.com/audio-blast-s...ect-placement/

I had a matching spare set of stereo interconnects so all I needed were the 2-into-1 adaptors which I found on the bay for under £5 for 5 (you need 4 per source).

https://www.ebay.co.uk/itm/RCA-Male-...72.m2749.l2649

I use a Bluesound Node 2i into CR Kalypso amp connected to Boenicke W5 speakers. I first played a test track - "I Feel Like I'm Drowning" by Two Feet - a few times using the standard connection. I then powered everything down before doubling up the cables and re-listened.

In a word "WOW". The base was firmer, more precise and had proper pitch. Vocals were better separated from the surrounding music and locked into position. The sound stage expanded by about 25% giving a real wall of sound - extending well beyond the speakers left and right.

I initially thought this effect might just be a placebo - me wanting to hear a difference - so I reverted back to the original set-up to re-test. I wasn't being fooled - the improvement to the music was real - I couldn't believe that for £5 plus a set of cables I had brought about such a positive change.

It is definitely worth a go - your mileage may vary - as the saying goes, but in my system, in my room the changes were not subtle. I will be sticking with the double-cable connection for sure.

As the article states - you do this at your own risk - I double then triple checked all my connections before switching anything on.