Hey guys.
I bought a bunch of HiWave BMRs for a line array and am debating on how to correct the dip around 1.5k. I want to use this full range but I can hear the dip. I was thinking of a few small mid drivers with a 4th or higher narrow band filter. I have already tried this and it actually works. But before I do this I should ask you guys what else can be done that I may not have though of already.
Thanks in advance!
I bought a bunch of HiWave BMRs for a line array and am debating on how to correct the dip around 1.5k. I want to use this full range but I can hear the dip. I was thinking of a few small mid drivers with a 4th or higher narrow band filter. I have already tried this and it actually works. But before I do this I should ask you guys what else can be done that I may not have though of already.
Thanks in advance!
I have done 8 drivers. I plan on using 12. I used a morel cam mid crossed 4th order from 1k to 2k and was able to adjust it's volume independently, it helped a lot.
Not yet, just going by ear and referencing other speakers. My little mixer I used for phantom power for the measurement mic died on me so as soon as I pick up another I can measure.
I know I'm not doing this conventionally. Also I should have said super tweeter.
I wanna try something different.
What about these with that narrow band filter?
https://www.parts-express.com/pe/showdetl.cfm?partnumber=275-010
https://www.parts-express.com/pe/showdetl.cfm?partnumber=275-010
Hey sorry nonsuch.....I forgot all about this thread!
Are you just going to roll those tweeters in with a cap? Or a proper crossover to the mids.
What frequency if a crossover?
Are you going with a line of tweeters?
The reason I ask is that unless the line is short and you are out of the fresnel zone you will probably need eq anyway even if the crossover is low enough to avoid CTC spacing issues.
But if the tweeters are rolled in, and the hiwaves are run open, you will have CTC lobing issues.
You said you wanted to go with 12 driver line?
So that's 4 x 12 = 48"
You would have to be pretty far back to be out of the fresnel zone of higher frequencies.
Which means you will need eq to combat HF roll off due to CF.
Are you just going to roll those tweeters in with a cap? Or a proper crossover to the mids.
What frequency if a crossover?
Are you going with a line of tweeters?
The reason I ask is that unless the line is short and you are out of the fresnel zone you will probably need eq anyway even if the crossover is low enough to avoid CTC spacing issues.
But if the tweeters are rolled in, and the hiwaves are run open, you will have CTC lobing issues.
You said you wanted to go with 12 driver line?
So that's 4 x 12 = 48"
You would have to be pretty far back to be out of the fresnel zone of higher frequencies.
Which means you will need eq to combat HF roll off due to CF.
I haven't got it all figured out yet. If I cross the tweeters to the BMRS it will be at the point the FR drops. I think it's like 13-14k but I would measure it once it's in the box. The room is very dead so I will have a HF issues off the bat. In the past, speakers I've made for that room I would make the tweeter louder. What I'm worried about the most is the dip at 1.5k. https://www.parts-express.com/pe/sho...number=275-010 would combat that if I do a narrow band filter. 4th or even 8th order. So there will be 3 drivers x however many. I don't think I have to do 1:1:1. I might be able to do 1:1:2. The BMRs are 4 1/4" so 12 would be 5"
Distance is only 10' back.
Distance is only 10' back.
I wouldn't try to do this with passives.
There are just too many anomalies to consider.
You are defiantly going to get HF combing, I think that dip is only 1 piece of the CF pie....
I don't trust their graph anyway. It looks like its 1 octave smoothed, and if so, that dip wouldn't show up so pronounced. I'm sure there is a phase issue going from piston mode to flop flop mode
There are just too many anomalies to consider.
You are defiantly going to get HF combing, I think that dip is only 1 piece of the CF pie....
I don't trust their graph anyway. It looks like its 1 octave smoothed, and if so, that dip wouldn't show up so pronounced. I'm sure there is a phase issue going from piston mode to flop flop mode
I wouldn't try to do this with passives.
There are just too many anomalies to consider.
You are defiantly going to get HF combing, I think that dip is only 1 piece of the CF pie....
I don't trust their graph anyway. It looks like its 1 octave smoothed, and if so, that dip wouldn't show up so pronounced. I'm sure there is a phase issue going from piston mode to flop flop mode
Ok well how about the BMRs crossed over at say 1k to the 1/2" inverted dome mid/tweeter (non-comb filtering) and cross that at 15k to supertweeters (or at least tweeters that are strong to 20k+). I can do this with a 24db electronic stereo 3-way. Question is, do I need to do 1:1:1?
Well, the 1/2" mid/tweeters have a 520 Hz Fs. I'm sure they will do 1k. They say that it will do up to 15k without comb filtering. I can cut them off there and add a super tweet to go up from there.
Thank you but I do have the ability to test, I just need to get a new mixer. I did WT3 10 of them, here are my results for the BMRs:
http://i39.photobucket.com/albums/e169/nonsuchpro/bmrs.jpg
Yeah, they have a low Fs but they can only produce 72 db max each.
You would need 250 of them to produce 99db at a 1kHz crossover.
Its not only CTC spacing that causes CF, its the fact that its a lIne source.
Its the different arrival times along the line that causes CF.
You need a rising response in the drivers to stay flat with a line source, or you will have to eq.
You would need 250 of them to produce 99db at a 1kHz crossover.
Its not only CTC spacing that causes CF, its the fact that its a lIne source.
Its the different arrival times along the line that causes CF.
You need a rising response in the drivers to stay flat with a line source, or you will have to eq.
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