What happened to my bass?


Ok, for those of you willing to read a bit, I have, as usual, something driving me nuts. I'm a speaker builder. Current speakers look like Watt/Puppy, consist of 11 inch Eton, 7 inch Scan Speak, Scan Speak Revelator tweeter. They perform very well and I haven't changed anything about them in 5 years.....but I have changed houses and of course rooms. Prior room was twice the size of the current, rather small, living room. Bass was a tad shy in the prior bigger room which was in a basement with a good amount of exposed insulation and floor joists up above. Current room is plaster covered drywall, bass traps in front room corners. Bass is generally quite a bit better in the smaller room and according to my pipe organ tracks, very low bass is no problem. So, finally, to the point. Yesterday I am listening to Bygone Days (Eileen Ivers violin track) and it dawns on me that that track has sounded different in the past. In fact, on second listen, there are bass notes completely missing that I clearly remember. I assume the memory goes back to the prior bigger, bass-shy room! I just don't get it. My sense is that bass is fuller and more balanced in this room on everything else I have listened to, and then I get to this Ivers track and there are bass notes that actually had some growl to them, completely missing? It's really wierd when you anticipate something in music and it has disappeared. Room null? By the way, it makes no difference where I am in the room. I even stuck my head behind the speakers. Am I the only one whose system drives them nuts from time to time?
240zracer
To measure room response, I bought a Rives Audio test tones CD and Radio Shack SPL meter. Put the meter on a tripod at ear height where your listening chair is, and measure away. Rives Audio has a lot of resources; check their webpage.

It could be a wired out of phase issue, but probably not if it's only specific notes/frequencies. Checking phase won't cost anything but a few minutes of your time, so by all means check that first before buying anything.
Thanks for responses! And sorry, I have been out most of the day. I'm 99 percent sure it is not a phase issue. I reserve the 1 percent, because I build crossovers and have discovered many ways to make mistakes. So much so, that the first thing I throw in the player is a test CD. I have a dead center image with only the woofer section of the crossover playing and with the full crossover playing. I think the walls are drywall with "thincoat" plaster on the drywall. Looks like they used a sponge to create texture. House built in mid-forties. Shadorne, about 2 months ago, I was considering the room measurement setup described by Ethan Winer on his site. Generates waterfall plots on a PC. Is that your setup does? Up to now I have gotten by with my Radio Shack meter and test tones. I guess things like this bug me so much is that I consider them setbacks. I will try some things tomorrow and I will definately be taking this Cd to some friends houses in the near future.
I posted this on Ethan Winers forum as well. His response: "Yes, it is probably one or more deep nulls". And he also says to measure the room.
Am I the only one whose system drives them nuts from time to time?
04-25-11: 240zracer

Absolutely positively you are not! There are so many variables regarding things like impedance matching, current, voltage, the noise floor, the room etc. It's enough to drive an electronics novice crazy. Wouldn't it be great if you could get great music reproduction from high end gear without all the complexity? Sometimes there seems to be no explanation that makes sense to the average person. Frustrates the hell out of me sometimes. I've almost quit a few times. It would be worth it if I could find an audiophile expert, to come in and analyze all these electronics variables in the setup and advise on what needs to be done to maximize what's here or what needs to be replaced!!! I've spun my wheels for sure.
I hear ya, Foster 9! There have been times that I have looked at something 20 times and saw that it was wrong the 21st time. Crossovers are really bad that way. Brand new cartridges with the stylus mounted way out of whack. Imaging seems to play with my head more than anything else, and really the way some music is mixed it is easy to get frustrated. You have to be very careful selecting music to use as a reference. Luckly I have a couple audiophile friends with younger ears than mine.