It would be quite easy to to series parallel 4 speakers using standard portable power cable (3 wire round cable as used in commercial extension cords.) Terminate each end of each cable with 4 conductor Speakons. You would then need a Y cord or box at each speaker with two Female Speakons and a pigtail to the 1/4 in plug to your speaker.
There would be two kinds of Y Odd number speaker and even number.
The odd number Ys are wired White in to 1/4 in Tip White out to 1/4 in ring. Bk in to Bk out Green in to Green out
The even number Ys are wired White in to Tip Black in to Wt out Green in to green out and Ring
At the amp, Black and White are tied to one side of the amp output and the Green is tied to the other.
This is not a loop. Each cable goes to a speaker, identical cable to the next one ETC 4 speakers 4 cables. Speakers 1 and two are in series. Speakers three and four are in series.
