audiopoint,
Thanks for reading my post. What I meant was that it seems like just wires stuck in the wall outlet. However, pictures are not that clear and that outlet is in the back so there may be something else that is there and which I did not notice. That is why I asked about it. If there is such an unnoticed thing involved, I would guess it has something to do with the orange-colored receptacle wires appear to be plugged in. It is truly intriguing to see it so I thought I would ask about the story behind it.
You are way more technical than some of us so you may understand differences in materials and what to expect from certain configuration much better. Your praise of those amplifiers is interesting although I have to admit I got lost in the description of why they work in a certain way. Still, I would keep my mind open that someone very capable could, indeed, make a Pioneer receiver sound great. Seems unlikely, but we will not know until we try. And try we cannot unless we know how to make it that good.
On a totally different note, but fully connected to that poor nostalgic-looking Pioneer we are dragging into this mess, I have another question.
Many of the modifications/tuning/tweaks are on a very small level, yet they are allegedly producing significant changes in sound. Earlier in the thread, there was talk about removing covers, freeing capacitors, etc. with some theories how and why it may work. Removing a cover from a receiver, let it be this Pioneer for this purpose, exposes it to much more dust. Would the layer of dust on electronic parts influence the sound in any way? Does anyone have any theory about it? In case it does, would dusting it off be considered a tweak, tuning, or something third? If it does not influence the sound, why doesn't it?