Dave-
Once again it would be interesting to see the frequency response of your Sumiko Master Set placement measured at your listening position.
With your rear ported speakers a foot off the back wall, I'm
sure moving your speakers fractions of inches will excite room nodes. The manual for your speakers(http://www.sumikoaudio.net/va/manuals/BeethovenManual.pdf) makes this very clear.
Using the TacT system, I have flat bass response down to 20hz using no boost. Speakers are placed to optimize imaging. I have digital EQ and XTC available, so I don't have to suffer with poor recordings.
Once again it would be interesting to see the frequency response of your Sumiko Master Set placement measured at your listening position.
With your rear ported speakers a foot off the back wall, I'm
sure moving your speakers fractions of inches will excite room nodes. The manual for your speakers(http://www.sumikoaudio.net/va/manuals/BeethovenManual.pdf) makes this very clear.
Using the TacT system, I have flat bass response down to 20hz using no boost. Speakers are placed to optimize imaging. I have digital EQ and XTC available, so I don't have to suffer with poor recordings.