I am new to this forum. I hire Pa systems for a lot of occasions. I had came to occasions where i have to use for example 20 or 40 speakers on long roads transmitting the same sound multiple of times and I refused because I don't have volt line systems. Its not money wise to buy a whole system for using it a couple of time in a whole year. I came across somebody who connected 30 speakers in parallel using some sort of DIY box. I think that in the box there is a transformer or something. Can some help me with this system?