Who Tried Power Conditioners Over The Years and No Longer Use Them Today, Any Why?

Interestingly,

Plugging my amp directly to the outlet (instead of three different high quality multiplugs I’d sampled) made my system more dynamic, rich, and full-sounding. It wasn’t a figment of my aural imagination…it was clear, evident, and palpable. I gave it time between configurations, and ended right back to just plugging straight in. 
Then, I replaced the cheapo outlet with a Hubbell oulet, and there was an additional improvement (although that might have attributed simply to the fixture holding the plug more firmly/increased contact). 
I still use a Furman multi for the rest of my components, for convenience. 

" But profits come from satisfying consumer demand."

No Miller.  Profits come from stimulating it.

You've said it Miller:   "Selective memory nostalgia", is when you think you hear a difference after adding a passive component that you've paid a lot of money for, and then it gets locked in by the warm feeling generated by the apparently positive response to your wise spending.  We all have the urge to feel happy whether or not there is anything to be happy about.

As far as passive power cords are concerned, all will do the same job as long as they can pass all the current demanded without high resistance.

Power conditioners can be useful if they can actively remove noise and other unwanted artifacts from the line.

I've been using power conditioners since my 1st Adcom ACE515 Enhancer in the early 90's and today using a Furman Elite 15PF with Monster AVS2000 stabilizer. I will never get rid of my conditioners, to important in my system and also in my opinion. 

If you are connected to the grid in anyway you need a pure sine wave AC conditioner.

Even if you you are off grid, it's highly likely you still need one.

I believe every home is different power wise and I honestly don't think I would benefit from power conditioning. My house of stereo is on a completely separate power feed from the main house and I experience zero hum, no background noise or interference of any kind. My system in there has always had the blackest background no matter what I ran. And even with stock power cables. I replaced them all with Patrick Cullen Gold series cables just to see if there would be any improvement and there was none. Now cable connects, that's a different story. Upgrading my RCA cables had a profound impact, specially on my digital gear. I do live in a small remote community with all underground utilities and that may be benefitting the quality of my power vs folks who live in big cities, specially in apartments. Plus building the house of stereo from scratch with a very capable electrician obviously paid off. BUT it turned out more expensive than a top of the line power conditioner 
🙂

Keeping up on the audio literature I realize that some people have power that does not need conditioning. I have never been one of those. I now have two direct lines for my system, one for my amp and one for my power conditioner which powers the rest of my equipment. Each of these has made a significant improvement in sound. So I occasionally try my system without a power conditioner (when I make a change). Last time was a few months ago… I put in a Cardas power strip and took out my Cinepro Power conditioner (75 lbs… although 20 years old,was very highly rated). That test lasted less than a minute. The sound became flatter with a much higher noise floor. Over the years the SQ for me has always been wat better with power conditioning.

High power cords make a huge difference. That is the reason there is such a huge aftermarket. If you want a really great sounding system, well chosen high end power cords are required… just like interconnects and cables.

I'll give mine up when power company provides one for my house. I doubt they much care about quality of power delivered to my house. I suffered with 123-126 constant voltage delivery for years, finally had to build bucking transformer so my audio equipment's transformers wouldn't hum me out of listening room. And possible damage to insulation on those transformer windings, you think they care. 

And then we have all these modern electronic gadgets in our homes and neighbor's homes with noisy switching power supplies. I have all the dedicated lines, high end ac outlets and power cords. These don't clean even your own home generated ac. Try using a hair dryer or dimmer switch on incandescent lights in your home while system is idling, even with the dedicated lines I can hear this crap.

Trip lite 2400s I have a few. Slight mechanical noise problems.. All fixed.
I installed 20 amp detachable PCs and removed all the wire nuts and added crush connectors with serious pressure (cold weld) copper butt connectors. Copper Hubble outlets with contact enhancer..

Took off one super high frequency ferrite ring...  I added a copper grounding lug with 12 1/4" holes drilled. You just tighten the bonding screw to bond to the chassis or use is as a common bond for noise reduction.. Works pretty good 1/4 x 1/4" male mic cable works perfect.

I got a Furman Elite many years ago, and I always miss it when it's out of the system. 

@wrm57 Yes not sure I would need the AQ5000 only have 5 components and AH X200 is not that huge of a power hogg.

One thing that has changed since the 90's is the explosion of devices that make up the average home. I'm sure there are papers out there that document how much the noise environment has changed.

Will buy where I will have return privileges.

@jerryg123 , that's what I did with the AQ5000 and it stayed.

As @ebm said it will depend how resolving your system is.

I have dedicated 200 amp service and I am isolated from the rest of the house. Only my system is on this circuit. I also have Signal Cable power cords and interconnects on my system.
In the past I had several different power conditioners on my system and now I have my AH X200 direct to Hubbell IG5362 Duplex Receptacle and my other components pulling power from a Furman SS-6B-PRO with the NFC Line Conditioner. Thinking of upgrading the Furman looking at the iFi or AQ1200 Will buy where I will have return privileges..

When my PS Audio  AC Junction box overheated and bit the dust, I replaced it with a generic TripLite box that happened to be in the house. Son of a gun, the stereo sounded better with the TripLite. I still though, connect the TripLite to my groovy PS audio wall outlets with the hefty PS Audio AC cord that came with the PS Audio box. Agreed, I was never able to do  back-and-forth comparisons, but I just don't care enough to fret over it. I'm getting good sound, and that's enough.

I’ve used a variety over the years, both conditioners and regenerators. Let’s see: TAD/Bybee; Bybee/Curl Pro; PurePower 2000; Running Springs Dmitri; Audience’s top duplex wall mount, whatever it was labeled, just for my phono stage. Once I installed 4 20-amp dedicated lines with top Furutech duplexes and a separate subpanel running directly back to my new 200-amp service, though, I pretty much gave up on conditioning, etc. I liked direct to the wall better. Then I tried AudioQuest Niagara 5000 around 18 months ago, just to see, and it has stayed in my system ever since. With everything in the signal chain plugged into it (very important to cut ground noise), including high power class A amps (when I use them), the noise floor drops dramatically and everything is at once more detailed and more natural. AQ Hurricane cords all around really help, too. Now 3 dedicated lines sit unused.

Depends on your system and its resolution I love mine VIBEX Platinum 2 units.

Then in the ’90s slowly they both became a huge profit market for stores and manufacturers of them.

Pure narrative. The problem with narrative, it relies on innuendo and implication rather than facts and logic. The implication is there is nothing of value here, it is all down to some sinister force called "profit".

But profits come from satisfying consumer demand. Power conditioners, power cords, speaker cables, interconnects- these are all so much better than your old AC outlet, freebie rubber power cords, lamp cord and patch cords they are on another planet.

It is however supposed to be an open market. Just because better stuff is out there, doesn’t mean you necessarily buy it. You are free to buy whatever you want. Even stuff so bad it makes you wish for the really bad stuff of back in the day. This would seem to be the case. Either that, or this is another case of good old selective memory nostalgia.