14-Aug-2015, 18:55
Hello,
Can anyone shed some light on how to calculate the delay for the subwoofer. I asked the manufacturer for the amount of delay on their subwoofer (Monitor audio SW12) and got the following response:
“The DSP core has no delay added to it and the internal processing delay is 1 Sample. The ADC and DAC also add some small amount of delay but again this is around 1~3 samples. The total delay input to output will be much better than a very worst case of 10 samples and the DSP core runs at a sample rate of 48kHz so this is equivalent to 0.208 milliseconds which is phase terms at 80Hz is 5.7 degrees.
The delay in distance is 7.1cm which is usually a lot less than the error in path length between the speakers and the subwoofer. Also at these frequencies the difference either of these will make will be very negligible as the frequency response is dominated by room modes which will be orders of magnitude greater in their effect on the frequency response.”
The subwoofer is (counting from the listening position) about 60 cm (1.9865 feet) further away then the main speakers. I read in the posts that I should delay 1 milisec per 1.13 feet (34.44cm).
Does this mean that I should delay the main speakers with: 0.208 milisec + (1/34.44*60) = 1.95 milisec --> 1950 microseconds?
Thanks for the help.
Pascal
Can anyone shed some light on how to calculate the delay for the subwoofer. I asked the manufacturer for the amount of delay on their subwoofer (Monitor audio SW12) and got the following response:
“The DSP core has no delay added to it and the internal processing delay is 1 Sample. The ADC and DAC also add some small amount of delay but again this is around 1~3 samples. The total delay input to output will be much better than a very worst case of 10 samples and the DSP core runs at a sample rate of 48kHz so this is equivalent to 0.208 milliseconds which is phase terms at 80Hz is 5.7 degrees.
The delay in distance is 7.1cm which is usually a lot less than the error in path length between the speakers and the subwoofer. Also at these frequencies the difference either of these will make will be very negligible as the frequency response is dominated by room modes which will be orders of magnitude greater in their effect on the frequency response.”
The subwoofer is (counting from the listening position) about 60 cm (1.9865 feet) further away then the main speakers. I read in the posts that I should delay 1 milisec per 1.13 feet (34.44cm).
Does this mean that I should delay the main speakers with: 0.208 milisec + (1/34.44*60) = 1.95 milisec --> 1950 microseconds?
Thanks for the help.
Pascal
