Hi all
Thanks for the forum. I have 4 identical 18 inch sealed subwoofers with Hypex DS8 plate amps. The room 5.3*4.5 metres with 2.7 metres ceiling. This room is used for watching movies and the subs have been individually measured, moved around, remeasured and then taken a combined measurement. The subs are basically close to 4 corners of the room. I probably do not need 4 subwoofers in this room but they came from a different house and a much larger movie room that was lacking bass. I have not tried only EQ 1-2 subwoofers.
I am trying to achieve more bass below 30 hz.. The subs designer has modelled the subs as one sub can produce 120dB of output about 25Hz and at 20-15hz and below it can still produce 110dB
I have tried time aligning the subs in REW and have tried them in all combination over the last few 3-4 months. Eg 1234, 4321, 3241, 3421. Time alignment gives me a better aligned response with lower bass and removes some dips than simply playing all 4 subs together. It gives me delays on some subs and suggest invert polarity on 1 or 2 subs depending on which order I start with. My concern is that when I then try and Eq the aligned response and import into the file into minidsp 2*4hd and measure the actual response is not close to the predicted response. I also find that when I enter the time delay and inverse polarity from the aligned response into the minidsp that the actual response is worse than if I leave the delays all blank and ignore the suggested inverse.
I get a reasonable result if I try and have a 2db room/house curve and a target level around 81 hz. If I try and add a larger 3,4,5,6 db house curve the actual results are much more ragged.
I think I am making progress, and this is the best results I have so far. I am now listening to a few action movies with good bass soundtracks.
Is this the kind of result that I would expect? These are non smoothed results. In the image of the actual results Sweep 9 config 1 has a low shelf at 35 hz with 4 db gain and a Q of 1.0 entered on the input side of the MInidsp 2by4HD. Sweep 6 has a 20 HZ peak filter 5 db gain entered into the minidsp input side.
One thing I am finding hard to follow is that I have a 105 db output at 42 HZ before EQ and EQ is applying 15 Db cut to this peak. I have tried to manually reduce the amount of cut at this frequency but without great success in actual results
I have not spend much time adjusting subs with mains but have mains crossover set at 100 hz, and the subs are running full range. The mains are two way speakers with 8 inch bass driver
I do not have any experience trying to phase align the subwoofers using impulse overlays and have not looked at this feature. is this an important thing I should do?
Thanks for any suggestions?
Have a good day
Kevin
Thanks for the forum. I have 4 identical 18 inch sealed subwoofers with Hypex DS8 plate amps. The room 5.3*4.5 metres with 2.7 metres ceiling. This room is used for watching movies and the subs have been individually measured, moved around, remeasured and then taken a combined measurement. The subs are basically close to 4 corners of the room. I probably do not need 4 subwoofers in this room but they came from a different house and a much larger movie room that was lacking bass. I have not tried only EQ 1-2 subwoofers.
I am trying to achieve more bass below 30 hz.. The subs designer has modelled the subs as one sub can produce 120dB of output about 25Hz and at 20-15hz and below it can still produce 110dB
I have tried time aligning the subs in REW and have tried them in all combination over the last few 3-4 months. Eg 1234, 4321, 3241, 3421. Time alignment gives me a better aligned response with lower bass and removes some dips than simply playing all 4 subs together. It gives me delays on some subs and suggest invert polarity on 1 or 2 subs depending on which order I start with. My concern is that when I then try and Eq the aligned response and import into the file into minidsp 2*4hd and measure the actual response is not close to the predicted response. I also find that when I enter the time delay and inverse polarity from the aligned response into the minidsp that the actual response is worse than if I leave the delays all blank and ignore the suggested inverse.
I get a reasonable result if I try and have a 2db room/house curve and a target level around 81 hz. If I try and add a larger 3,4,5,6 db house curve the actual results are much more ragged.
I think I am making progress, and this is the best results I have so far. I am now listening to a few action movies with good bass soundtracks.
Is this the kind of result that I would expect? These are non smoothed results. In the image of the actual results Sweep 9 config 1 has a low shelf at 35 hz with 4 db gain and a Q of 1.0 entered on the input side of the MInidsp 2by4HD. Sweep 6 has a 20 HZ peak filter 5 db gain entered into the minidsp input side.
One thing I am finding hard to follow is that I have a 105 db output at 42 HZ before EQ and EQ is applying 15 Db cut to this peak. I have tried to manually reduce the amount of cut at this frequency but without great success in actual results
I have not spend much time adjusting subs with mains but have mains crossover set at 100 hz, and the subs are running full range. The mains are two way speakers with 8 inch bass driver
I do not have any experience trying to phase align the subwoofers using impulse overlays and have not looked at this feature. is this an important thing I should do?
Thanks for any suggestions?
Have a good day
Kevin