Hi everyone!
I've started an 4 ways open baffle project with:
2 x Beyma SM118N on the bottom
1 x 18Sound 12ND610 8ohm
1 x 18Sound 6ND410 8ohm
1 x Satori TW29RN-B
Baffle is 140cm x 50cm
I'd like to go passive at least between 18Sound 12ND610 and 18Sound 6ND410 and to use them as wise as possible. Any suggestion for the best crossover points for the whole project is useful.
I measured them with DATS V2 and Omnimic but I am not sure about my Omnimic results and I don't understand yet how to use Xsim or any other software used for crossover purpose.
Can you please advise me with a passive crossover for these two drivers?
Attached is the .zma and .frd files for these two drivers.
Thank you!
I've started an 4 ways open baffle project with:
2 x Beyma SM118N on the bottom
1 x 18Sound 12ND610 8ohm
1 x 18Sound 6ND410 8ohm
1 x Satori TW29RN-B
Baffle is 140cm x 50cm
I'd like to go passive at least between 18Sound 12ND610 and 18Sound 6ND410 and to use them as wise as possible. Any suggestion for the best crossover points for the whole project is useful.
I measured them with DATS V2 and Omnimic but I am not sure about my Omnimic results and I don't understand yet how to use Xsim or any other software used for crossover purpose.
Can you please advise me with a passive crossover for these two drivers?
Attached is the .zma and .frd files for these two drivers.
Thank you!
It's almost impossible to deal with a 4 way OB passive . EQ , XO , phase and so on , it is very hard to get it right passive . So , why not active all the way ? You already consider to go active , right ?
It is challenging enough to do the acoustic cross for a four way random open baffle. I'm thinking OP will either need to experiment with crossover points or do multiple angular measurements. That or find someone who has a similar project, or who can simulate acoustically.
I strongly suggest that you do some modeling. I like to use TheEdge, since it is quick and easy. The only downside is that it can only model one driver at a time.
The modeling will help you decide on how large a baffle to use, and then where on that baffle to place the drivers (central? near the edge? etc.). Make sure to look at the response off axis when doing the modeling.
With the baffle and placement chosen, you build the baffle, install the drivers, and then measure the response of each driver on axis, and off axis at 25deg and 45deg (at least, more angles would be better). This is not totally trivial because it is difficult to make indoor measurements accurately below 300-500 Hz with enough resolution to be useful. The only option would be to use better modeling below 500Hz and acoustic measurements above, but that is getting trickier and requires more technical understanding of what is going on.
Finally, develop a fully DSP crossover from the results of the measurements. I suggest DSP because there is typically much more "correction" that is needed (e.g. EQ to flatten the responses of the drivers) with an OB system in addition to the crossover filters themselves.
The modeling will help you decide on how large a baffle to use, and then where on that baffle to place the drivers (central? near the edge? etc.). Make sure to look at the response off axis when doing the modeling.
With the baffle and placement chosen, you build the baffle, install the drivers, and then measure the response of each driver on axis, and off axis at 25deg and 45deg (at least, more angles would be better). This is not totally trivial because it is difficult to make indoor measurements accurately below 300-500 Hz with enough resolution to be useful. The only option would be to use better modeling below 500Hz and acoustic measurements above, but that is getting trickier and requires more technical understanding of what is going on.
Finally, develop a fully DSP crossover from the results of the measurements. I suggest DSP because there is typically much more "correction" that is needed (e.g. EQ to flatten the responses of the drivers) with an OB system in addition to the crossover filters themselves.
dsp would be the optimal route i think
i build a 4 way OBSP myself with :
- b&c 18sw115
- seas excel w22
- scanspeak 10f
- mundorf 17d2.2
OBSP open-baffle-speaker-project - forum.zelfbouwaudio.nl
i build a 4 way OBSP myself with :
- b&c 18sw115
- seas excel w22
- scanspeak 10f
- mundorf 17d2.2
OBSP open-baffle-speaker-project - forum.zelfbouwaudio.nl
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