Power conditioner some say yes and some say no.

I live in a 1901 colonial and am convinced that my electric sucks. I just purchased a isotek 6 port power conditioner from crutchfield that I'm gonna try out.

My biggest issue is faint audible speaker hum when connected to my power amp, but when I just recently tried to connect my subwoofer to speaker level connections off same said amp (as opposed to preout RCA) my amp hums something wicked.

I tried a line isolation plug for the power amp (kinda help diminish the speaker hum), but did nothing for the subwoofer.

I'm gonna try to run everything through my integrated amp, but I'm also gonna try the isotek.

I'll let you know what audible results I get, but if it doesn't do anything... back it goes.

I was using a Audioquest Niagara 5000 for my entire system. My dealer recommended I plug my Diablo 300 straight into the wall. My jaw hit the ground. The amp came alive. I could hear the sonic improvement instantly. 

That's promising!

Hello,
First, Do you have the ability to run a new dedicated 20 amp line to you equipment? If you can, please do that first. Also, if you can have the electrician drop in a better grounding rod. 8’ of copper coated grounding rod or two tied together. $20 each is very little to spend for a big change in sound.  The grounding rod that is there might be to inadequate for a music system. It was put their first safety at minimum code. If you did that or cannot do that the I say look into the Puritan line of products. They not only have one of the best power conditioners I have heard but also ways to help fix the grounding by adding a dedicated grounding system and the hardware to easily get it connected to your gear. They have recently come out with a special plug that looks to filter the ground so if you live in an apartment or a shared environment you have a better ground point to feed from. Regardless you should try the Puritan PSM156 power conditioner or double the outlets and filtration the PSM1512. The new product by Puritan is called the Ground Master City. If you live near the Chicagoland area this is the store where I bought my Puritan PSM156. https://holmaudio.com/
They let you try before you buy. No risk to your wallet just your time. Believe me, you will not want to take it out of your system. 

I bought a power conditioner when I go too the point it was a great way to have everything plug into the one unit. I built my own power cords and now it we are going to be gone for any period of time I only unplug the PC. As for improving the sound, I cannot say. YMMV