Treating the ceiling and floor, who else has had great results?

@ted_b 

You wrote:

Before and after REW waterfall plots show a marked reduction in early reflections from the floor beginning around 1k or so on up.

Thanks for that.  We are a little off-topic as I didn't want to talk about all floor treatments, but yes, this is worth doing.   If you are measuring room resonance times the floor treatment won't show up, but it will in waterfall testings.   So, yes, Darko is right, the floor is not the end-all, be-all for room treatments but we also can't ignore it.

Carpet can deaden foot traffic noise and high frequencies but as far as helping to tune a room for mid-range and low-end frequencies for audio enjoyment, it's not much help.

Per square foot, carpets are far less effective than dedicated acoustical panels, but even if we say it's "only" effective above 1 kHz, that's a good thing, especially when the floor is a glaring first reflection point and should not be neglected. 

Still, the overall tonal balance of a room, and even your ability to hear if a carpet is there or not will be determined by everything else.

I'm not here selling rugs.  I'm suggesting if you haven't tried treating the floor behind and between your speakers, for some this can be good.  Also, not here to debate the point forever.  Just try it and if you like it do something more.  

@kodak805

It’s important to read the whole article. I’ve never claimed a rug was a solution to everything. If you’ve read my posts on acoustics I often talk about having a minimum critical mass before room treatments become audible, including first reflection points. That still applies here.

Darko’s article doesn’t say rugs aren’t helpful, but that they are limited in effectiveness. That’s different. Also, the point I wanted to say here was a little different and dealing with a small overlooked corner of the room behind the speakers. Fortunately I’m not asking anyone to spend money. Throw a rug or blanket behind the speakers and see if you hear a worthwhile improvement. If so, maybe get a panel for that area.

Specifically Darko does not say "don't put a rug on your floor it's useless."  He only points out how limited its effect it is in light of other treatments.   You'd be foolish to NOT put a rug down if you have a bare wooden floor.

I need to clarify.  For the floor this time I meant to talk about the area directly between the speakers, and behind the speakers. 

Most of us have put rugs down in front of the speakers if we don't have carpet already.  It's the 4-6' behind that line that I find often gets ignored because it's not a clear 1st reflection point.