Oneoclock generously sent me parts to experiment with my horns and his acoustic filter.
The results are amazing, the problem I had mentionned earlier in the thread is now gone, the tweeter have a more relax presentation and now need next to no correction. They sound so good they are now staying in my system and I will be looking to rebuild my temporary horns with probably an expansion on the vertical plane.
Some measurements :
Red is with the AF installed, blue without (1m)
Something is happening to two peak I had in the GD, they are now gone
This is without the AF 0-15-30 degres (1m)
This is with 0-15-30 degres (1m)
I also have experimented with Luis horns, they do better than my JMLC in the vertical plane but the JMLC off axis are better. I will be experimenting with his dual horns setup next and see if it beat my JMLC with the acoustif filter.
I'm really happy to have found a way to get good performance with the tpl-150, thanks a lot Luis for your hard work on this.
I could confirm myself what was observed here about wide baffles.
I built a 40cm wide hard cardboard baffle and suddenly I had a plateau, about 5db more at 1khz, decreasing to 2db at 2khz and then quickly vanishing.
This was reflected in the overall response of my system which, without that baffle, is actually quite flat from 500hz to 5khz, with a tiny dip (2db) at 1khz and a slightly larger and deeper one at 3khz — both however quite inconspicuous. The effect of the baffle was readily audible, the scene moved forward quite a bit and bass, treble, sounded more recessed (making bass instruments and high percussion sounding in the back). The effect was overall a bit unnatural.
Depending on the design, the use of EQ, etc, it can be a useful tool in the arsenal of the loudspeaker designer, I am not going for a baffle in my case.
I built a 40cm wide hard cardboard baffle and suddenly I had a plateau, about 5db more at 1khz, decreasing to 2db at 2khz and then quickly vanishing.
This was reflected in the overall response of my system which, without that baffle, is actually quite flat from 500hz to 5khz, with a tiny dip (2db) at 1khz and a slightly larger and deeper one at 3khz — both however quite inconspicuous. The effect of the baffle was readily audible, the scene moved forward quite a bit and bass, treble, sounded more recessed (making bass instruments and high percussion sounding in the back). The effect was overall a bit unnatural.
Depending on the design, the use of EQ, etc, it can be a useful tool in the arsenal of the loudspeaker designer, I am not going for a baffle in my case.
I installed the front filter with the original Beyma waveguide. It was easy - just required trimming about 1mm in a couple of finns. No big deal.
Disassembly and reassembly was easy too (make sure your bolts are long enough or have new bolts readily available before disassembling.
I didn't take pictures.
Filter done on plastic - I didn't ask which.
Disassembly and reassembly was easy too (make sure your bolts are long enough or have new bolts readily available before disassembling.
I didn't take pictures.
Filter done on plastic - I didn't ask which.
I cannot say for sure, but since these issues are caused by the slits on the magnet and their spacing when in a horn, I would say that they should be the same.
Any chance you can post the STL for the back cover that you were testing with? looks great, thanks for posting the filters. i'm printing a set now.
Rebooting this thread…
Can anyone supply me the notch filter for a 200h
is there a recommended size for the rear enclosure and stuffing used ?
Reading it seems mounting on a wide baffle causes problems ? I was thinking of mounting my tpl 200h on a 19-20” baffle, the measurements are better with no baffle just the horn ?
Thanks
Can anyone supply me the notch filter for a 200h
is there a recommended size for the rear enclosure and stuffing used ?
Reading it seems mounting on a wide baffle causes problems ? I was thinking of mounting my tpl 200h on a 19-20” baffle, the measurements are better with no baffle just the horn ?
Thanks