Hi guys
I want to build a quick, proof-of-concept open-baffle speaker with the drivers I have. I happen to have an old piece of veneered chipboard I can cut in half to use for this experiment (it came from an old cupboard). The resulting baffles will be about 39cm wide and 85cm tall. That will be just enough to house the three main drivers. I know it is only 16mm thick and not the ideal material to use for this, but it is what I have and won't be missed when I trash it after the experiment is over. I will probably add some strengthening wings to the rear, but they won't be very deep and size will depend on what pieces of off-cut I can get.
To aid the cross-over design I did a simulation in Tolavn's Edge and came up with following result:
This curve shows a clear 3dB peak at 700Hz. The rise starts at 1.4kHz and gets back to the flat line at 300Hz. Ignore the curve below 300Hz, because the program also sims for baffle-step and OB roll-off. My lower two drivers (when connected in parallel) will be about +6dB (maybe even more) more sensitive than the upper driver, so after the cross-over, the response will be flat and compensated for baffle-step (baffle-step point is 300Hz for this baffle). This curve will also be the same for the other drivers on the baffle (I did sim it). The response stays the same off-axis (yes, I simmed that as well).
Here is where I need some help. I want to use a simple, 1st-order cross-over between the drivers. So here is my question: based on that curve, where do I put the high-pass cross-over point to flatten the dipole peak? And where do I put the low-pass cross-over point? :help: I have a program to calculate the values for the inductor and capacitor for the cross-over, so that is not my problem. Any suggestions?
Thanks guys,
Deon
I want to build a quick, proof-of-concept open-baffle speaker with the drivers I have. I happen to have an old piece of veneered chipboard I can cut in half to use for this experiment (it came from an old cupboard). The resulting baffles will be about 39cm wide and 85cm tall. That will be just enough to house the three main drivers. I know it is only 16mm thick and not the ideal material to use for this, but it is what I have and won't be missed when I trash it after the experiment is over. I will probably add some strengthening wings to the rear, but they won't be very deep and size will depend on what pieces of off-cut I can get.
To aid the cross-over design I did a simulation in Tolavn's Edge and came up with following result:
This curve shows a clear 3dB peak at 700Hz. The rise starts at 1.4kHz and gets back to the flat line at 300Hz. Ignore the curve below 300Hz, because the program also sims for baffle-step and OB roll-off. My lower two drivers (when connected in parallel) will be about +6dB (maybe even more) more sensitive than the upper driver, so after the cross-over, the response will be flat and compensated for baffle-step (baffle-step point is 300Hz for this baffle). This curve will also be the same for the other drivers on the baffle (I did sim it). The response stays the same off-axis (yes, I simmed that as well).
Here is where I need some help. I want to use a simple, 1st-order cross-over between the drivers. So here is my question: based on that curve, where do I put the high-pass cross-over point to flatten the dipole peak? And where do I put the low-pass cross-over point? :help: I have a program to calculate the values for the inductor and capacitor for the cross-over, so that is not my problem. Any suggestions?
Thanks guys,
Deon
