Today I ran sweeps of just the Towers individually, together and then with the Subwoofer. I tried different positions within my room and finer adjustments within those positions. With the mains, I found that no matter what positions within the room I used, there was at least one and often 2 or 3 pretty big peaks and nulls (focusing mostly under 500Hz). What I learned with that exercise was that there was no clearly superior position for my Towers within my space. With that, I set the mains as per my original room diagram - this position had the least amount and severity of peaks and nulls.
I then ran sweeps with just my L12 (crossover 80, slope 24, peq off) in different room positions. Unlike with the Towers, there were really only 2 positions in the room that stood out (plus I did not have to worry about directional issues with the sub placement). One position covered the sharp null in the Towers at around 80Hz, but was generally worse other than that. The other position was much better under 60Hz but had the same sharp null at around 80Hz that the Towers had. I chose this second position and ran the sweeps with the Towers while adjusting for delay/phase. It was clear in the response curves when the sub was adjusted differently from 0 to 180deg where it aligned best with the towers. After the phase was set, I used the peq option on the L12 to soften a peak at around 30Hz.
Conclusions:
I do believe that if I added another L12 in the other sub location I could certainly smooth and enhance my lower frequency range.
Unless I can do some sort of room treatments and/or equalization this is the best I can do within my space. I think the adjacent room behind my mlp is causing most of the irregularities in my freq response.
Measurements aside, I find that these Sierra Towers and the Rythmik L12 sound incredible. They play plenty loud without a hint of strain. The bass is tight and authoritative, the mids and highs are clear and detailed. The RAAL tweeters are just amazing - in all the time I have spent listening, I have never felt that fatiguing sensation.
Advice, insights are always welcomed.
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