Audiolib, Not just the Music mode but only for 2-channel material. When using PLIIx with 5.1 material, the adjustable parameters can't be used. 7.1 is not about filling a large room with sound but instead about improved envelopment, directionality and imaging stability; irrespective of room size.

When a car exits screen-left, you want the sound to disappear to your left side. When a plane flies overhead, you want the sound to disappear behind you. How to get stable imaging at your sides and behind you with only one pair of surrounds? After all, even the best pair of surround speakers can't be in two locations at once.

The most effective solution is also the simplest: a pair of surrounds at your sides and another pair behind you. Makes it difficult for their respective sounds to come from the wrong direction. And since 4 speakers can literally 'surround' you better that 2 speakers ever could, you get wrap-around envelopment that is not possible with only 2 surround speaker. These qualities are desirable no matter how big or small your room.

If you're willing to experiment, here's a suggestion. First, make sure your surrounds are correctly placed: side speakers directly to your sides, rear speakers spread well (at least 60 degrees) apart behind you. Next, do a manual calibration (distances and levels) from your listening sweet spot, using the built-in test tones.

Then try a variety of 5.1 material; titles known for active surrounds. Make sure you are in PLIIx Movie mode. If you feel that the side speakers are distracting compared to the rears, lower their volume by 2-3 dB. This may get you closer to the balance you're used to in the surround field. (Don't worry, the surround police won't bust you for deviating from calibrated settings.) Live with this for a few days and let us know what you think.

Best,