Hooking up speakers which allow us to hear the feedback, as well as filter out background interference. The coil is essentially an antenna. If you don't filter and pre-amp the signal, it will have a lot of noise from radio and natural phenomenon. Next time, who knows when that will be, I will hook up a Negative Summing Record Cutting Pre-Amp and this speaker will sound ridiculously clean, clear, and loud. Even though it is completely made of scrap. Until then, please be well. Please subscribe! More soon!