ToTo Man
the band not the dog
I finally got my subs out of my room, so I now have more space to experiment with speaker positioning!
First stage of testing: measuring effect of front wall.
Speakers placed 103cm from side walls (25% of room width) and in line with front of hifi rack (speaker baffle 55cm from front wall). Speakers then moved back towards wall in 5cm increments until they can't get any closer to wall due to skirting boards. Mic is at my usual LP, 120cm from the back wall and 103cm above the floor.
As for room treatment, as well as the usual GIK corner traps running floor to ceiling in all four vertical corners and GIK 244 panels at side wall midpoints, I also have two GIK Monster traps on the back wall, centred behind the listening seat and stood about 15cm off the wall.
This isn't exactly representative of how I'd be listening to the speakers, I normally toe them into aim at the LP and I normally tilt them backwards to optimise phase at the MF/HF crossover frequency, but it would've been too time consuming to maintain these exact angles across multiple tests. For quickness these measurements are with the speakers parallel to the front wall and with no tilt.
The measurements in the graph below are for both speakers playing together, not individually, and with no averaging. The results suggest that the null at 135Hz gets better as the speaker is moved closer to the front wall.
I'll continue these tests tomorrow by moving the speaker forward to see what happens when the distance to the front wall is greater than 55cm.
EDIT - For quickness these tests were conducted using pink periodic noise and REW's RTA with 1/48 smoothing. I then applied additional 1/12 smoothing in post-processing. This makes the overlays easier to read at the cost of evening out the size of the differences between the different speaker positions.
First stage of testing: measuring effect of front wall.
Speakers placed 103cm from side walls (25% of room width) and in line with front of hifi rack (speaker baffle 55cm from front wall). Speakers then moved back towards wall in 5cm increments until they can't get any closer to wall due to skirting boards. Mic is at my usual LP, 120cm from the back wall and 103cm above the floor.
As for room treatment, as well as the usual GIK corner traps running floor to ceiling in all four vertical corners and GIK 244 panels at side wall midpoints, I also have two GIK Monster traps on the back wall, centred behind the listening seat and stood about 15cm off the wall.
This isn't exactly representative of how I'd be listening to the speakers, I normally toe them into aim at the LP and I normally tilt them backwards to optimise phase at the MF/HF crossover frequency, but it would've been too time consuming to maintain these exact angles across multiple tests. For quickness these measurements are with the speakers parallel to the front wall and with no tilt.
The measurements in the graph below are for both speakers playing together, not individually, and with no averaging. The results suggest that the null at 135Hz gets better as the speaker is moved closer to the front wall.
I'll continue these tests tomorrow by moving the speaker forward to see what happens when the distance to the front wall is greater than 55cm.
EDIT - For quickness these tests were conducted using pink periodic noise and REW's RTA with 1/48 smoothing. I then applied additional 1/12 smoothing in post-processing. This makes the overlays easier to read at the cost of evening out the size of the differences between the different speaker positions.
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