jasonsong86
Super Member
That is very interesting. I will experiment when I have time.play with placement
your speakers or your listening position is likely in a room mode which has serious dip in the bass region (very common). you need to find a way to localize your biggest room modes and to NOT place your speaker or you listening spot in one of your worst room modes.
if you can, use a mic and arta and measure your room.
if you dont have the necessary equipment, I find the 38% rule a good beginning to find good placement
THE 38 PERCENT RULE
The placement method used here is based on the "38 percent rule" which theorizes that the best listening position is 38 percent into the length of the room, when measured from either the front or rear wall. This offers the best compromise of peaks versus nulls for any given room size. For 2-channel listening you'll get the flattest low frequency response by sitting 38 percent of the way back from the front wall. However, this is not practical in many home theaters, especially those with large screens, because that puts you too close to the screen. Fortunately, you can get the same benefit by sitting 38 percent of the room length when measured from the rear wall.
Please understand that 38% is one theoretical best location to begin measurements, but it may not end up the best place to sit due to other factors - wall properties, speaker location, speaker type, furnishings in the room, and a host of other conditions that can affect frequency response. The only way to know which location really is flattest is to measure the low frequency response at high resolution using software such as Room EQ Wizard or FuzzMeasure as explained in our Room Measuring Primer article.
Once you know the ideal listening position from the front or rear wall, the next step is to place the loudspeakers. The speakers and listening position should be at the points of an equilateral triangle, as shown in Figures 1 and 2. Note that the theoretical point of the triangle is just behind your head, with the axis lines grazing your ears.
If you have suitable software such as the programs linked above, or the RealTraps Test Tone CD, or another way to accurately measure your room's low frequency response, you can experiment with different speaker distances by sliding both speakers along each axis while you measure the response. Otherwise, put them along the axis at a distance that is convenient and makes sense for the size and layout of your room. Too often people obsess over minute details that matter only a little, while ignoring ergonomic concerns that matter much more.
http://realtraps.com/art_room-setup.htm
https://www.gearslutz.com/board/so-much-gear-so-little-time/163019-38-rule.html
One other thing I noticed. I have to run my subwoofer in reverse polarity in order to not canceling out bass against the front speakers. That seem very strange. And it's not the subwoofer because I have two subwoofers and they all behave the same way. Maybe the room is also messing with the bass phase too?