Over the years i have had several high quality Bass heads but never one with an effects loop. My thinking was i need to be prepared to create "My sound" on any amp/cab combo in case i am playing a show that is being back lined; I would always go through my pedal board into the amps circuit and got a pretty good sound. Our guitar player swears by his effects loop and the other day when he found out the amp i recently switched to (Eden WT800) had a loop, so he suggested we try it. So we wired things up to the Effects loop and HOLY ****!!! I was shocked at how significant the improvement in sound was, this is kinda of cliche but it sound like a veil was lifted from my eyes and ears. The presence and top end were bright and airy, the lows were thicker, tighter and faster. If you have a loop, you MUST try it. I have a large pedal board and i rely on my pedals for the tone i want, my clean tone is sculpted with a pre amp --> compressor, i use a looper so every pedal is bypassed when not engaged, its not a matter of the pedals sucking the tone out but a matter of allowing the heads pre amp's circuit to color your tone before it gets to your pedals and what a difference that makes. I had to do some minor tweaks to the pre amp pedal and comp but it was totally worth it. ***FX Loop cliff's notes: The loop allows you to plug your bass directly into the head, after traveling through the pre amp circuit the signal then goes to your pedal board, then out of the pedal board back into the head power amp stage and out to the speaker cabinet. Ive been playing for decades and i cannot believe it took me this long to try it, im converted, Any head i use from this point forth must have an effect loop. Am i just really late to the game? how many of you kats use Effects loop?