Lost Hertz

I own a pair of Aerial Acoustic 10Ts and have been quite pleased with its bass reproduction. The 10Ts are rated in-room response down to 28Hz. In my old listening room, the bass was quite audible down to perhaps 24Hz before seriously rolling off.

In my new room, the bass is superior in every regard, except that the lowest bass regions in the perhaps 24 to 28Hz are now almost inaudible.

Old room was 8'T x 12.5'W x 20'L. The new room is a bit more box-like. It's dimensions are 10.5'T x 13.5'W x 17.5'L.

The new room's acoustics are far worse than my old room, but careful speaker placement, through many months of experimentation, has more than compensated for this deficiency. Except in the case of this lowest of regions.

Speaker placement is on the narrow wall (measurements taken from woofer's front and center):

From the side walls: 44.5"
From the floor: 26"
From the back wall: 72"
Speakers toed in perhaps 15 degrees.
Listening ears are about 7.5' from tweeters.
L & R tweeters are about 6.5'apart.

Any ideas on how I might be able to recoup some of the approximately 24Hz to 28Hz loss through speaker placement without seriously sacrificing other sonic attributes?

Don't know if this applies, Stehno, but when we changed furniture (took out a small couch), the bass went bye-bye. Anything different in that department?

Other than that, ask Jeeves...I mean, Rives.
Our rather, this Rives: http://www.rivesaudio.com
Sorry about that.
In the typical listening room, there is usually what's called a room "peak" or "suck-out" around 25Hz. I forget what this is due to, but it is so common that a lot of speaker manufacturers (particularly subwoofer w/ built-in amps like the Martin Logan Depth and Descent) come with a contouring control that lets you boost or cut the energy at this frequency.

In your old room, you were probably getting bass reinforcement in this region which "lifted" the natural roll-off of your speakers. So, lucky for you, you didn't need a subwoofer. But if you want to recapture that last bit of low end in you new room, you probably should consider one.