I replied to the same question over at AVS as follows:
Aworkx said:
I finally went for the Logos.
Sounds good. Adding a center channel brings more dynamics in my system.
However, it's not the perfect match with SL3. The voices play a bit louder than in the phantom mode and the dialogues seem to come directly out of the box. The Logos is at the bottom of the screen but not on the floor.
Have you ever considered using 2 smaller speakers as a center channel. For example : 2 aerius (one at each side of the screen).
Thanks for advices or experience
If you are not getting that perfect match, then there is still a setup issue. Integrating a center with dipole speakers is a bear no matter what the brand / model.
First, ensure the phase between L/R and center is correct. Use something like the Sound and Vision test disc to validate. But like I said, it's pretty tricky with dipoles (the SL3's), as the phase difference is a little hard to spot due to the wide stage the L or R speaker is throwing.
Second, use an SPL meter to adjust the level of the center. If it is overpowering the L/R, then it could be just too loud. But it’s not always that simple.
The next thing to double check is the delay setting for your center channel on the receiver or pre-pro, if the speaker is sitting in front of an RPTV (vs. below a wall mount or drop-down screen), it could be physically too far forward in the room relative to the L/R. That will cause earlier arrival of center channel info, tilting the perception of volume.
Even if physically behind the plane of the L/R, do check the delay setting, it should be calibrated per your pre-pro’s instructions.
Finally, it could an EQ balance issue, the Logos does have a dynamic tweeter for improved dispersion, which again tilts the perception towards the center, as it will have ‘brighter’ high end. Sometimes just turning down the treble for the center can help a bit.
Personally, I use a ton of speaker processors (DBX 260’s) and a full audio measurement suite with a calibrated mic to tune and balance my rig. But that’s pretty extreme, you should be able to get great results with a decent test disc, an SPL meter and some patience.
Hope that helps.