Equi=Core 1000

@dpop - go to the website for Underwood Hi-Fi and you should be able to read all about Equi=Core and Deep=Core....

I use an EquiCore 1800 for my sources. I think it's a steal at Walter's sale price. I have 2 dedicated lines plus a new service panel and new wire run from outside but suffer from noise due to old wiring and poor grounding in my neighborhood. The EquiCore provides me with a low noise-floor, and removed low-level buzzing from the mains. I'm sold on the balanced power design which separates the ground from the inverted hot and neutral to provide clean power at the output. Some forum members said I should have gone with Audioquest, I don't have an answer for that. 

Now, there's a catch. Underwood introduced the Deep=Core as an add-on power conditioner with extra features and increased filtering. All I can say is "WOW" to the increased power conditioning performance. There's an absolutely black background, something I've never experienced with my system. There's more inner detail and separation between instruments with no colouring of the sound. There's a DC blocker which further cleaned my mains and a cool feature to adjust the bass for the most low-end detail and impact. The price of both on sale was less than the Audioquest Niagara.

To answer your question (finally), I was very impressed with my Equi=Core 1800 which I used without it's companion for about a year. I never regretted the purchase. It definitely brought my system to a higher level.

One more thought; other owners of the Equi=Core 1800 say they can plug in their amps with no detrimental sonic effects. I can't speak to this regarding the 1000. I have many upstream components, both analogue and digital, and have them all plugged into the Equi=Core with no issues such as digital contamination to analogue power supplies.

@larsman thanks for the reply. I have to say, your response did not give me the warm-fuzzies inside. Do you have the version with the new transformer, copper duplexes, and power cord? Also, have you used any other power conditioner to compare it to? Once again, thanks for your honesty, I was just hoping for a more positive response. 

@stevebohnii - the only other power conditioner I've tried is one I got for a few hundred dollars from Amazon. I wouldn't have even bothered with a power conditioner except for that amp with the unacceptable noise floor, as I've never had any audible noise issues with my headphone system except for that one amp. I could probably go back to the Amazon one and not notice any difference.

However, don't pay too much attention to my experience - I live in an apartment in a city downtown and there's nothing really I can do about the wiring; you might have more options there...

I do use a Sound Application XE-10 power conditioner for my 2-channel system; I've never used anything else with it so I can't compare there...