Originally Posted by Cingulate Gyrus
I have a few questions about getting the most out of the Rythmik E15HP. On the Rythmik handout that comes with the subwoofer it emphasizes that one of the most important settings to manipulate is, "phase." Rythmik recommended either a 1 o'clock or 10 o'clock setting to begin with depending upon whether your speakers are sealed or ported in design. Honestly, I could not tell much of a difference no matter what the phase knob was set to. On the front wall I have my magnepan 1.7 speakers, which are about the same distance away from me as the subwoofer. The subwoofer is located on the back wall of the room, in the corner, to the right of my listening position. Is it because the main speakers and subwoofer are about the same distance from the listening position that the phase control adjustment has little noticeable impact on bass response? My 2nd question concerns the use of the PEQ settings. There are 3 rotary variables that can be adjusted within this section of the amp. Are these 3 additional settings manipulating a single frequency? If so, I would probably need to do a very sensitive frequency analysis to determine whether any one particular frequency range required either amplification or attenuation. I guess the concept for this PEQ setting is that based on a particular room, with its nulls and nodes, the specific listening position may have certain frequencies canceled out? Thanks for your help guys.
Start with the PEQ at 0.
Do you have a receiver with auto-calibration and bass management? I have my phase set to 0, and use my receiver set the delay for me, for phase.
If not, adjust the phase so that you get the maximum output at the crossover frequency. You can accomplish that by using a test tone at the crossover frequency and an SPL meter, or (better yet) by using frequency analyzer software on a PC or laptop with a measurement mic, like Room EQ Wizard. As an alternative, there are SPL and frequency analyzer apps available for smartphones/tablets.
With the PC route, here is a good measurement mic: http://cross-spectrum.com/measuremen...ated_umik.html
Ideally, you would use measurements to guide EQ, whether auto-EQ in a receiver or using the PEQ. You can also do it by ear if there is something you like.
BTW, you mentioned that you were crossing over at 45hz. I'd recommend starting at 80hz and tuning from there. I'd consider between 60-120hz typical good values. It is important to get the phase and EQ set well for the best results.