Guys,
Need a little help here, I have 40 manufactured line array cabinets with 2x8" lo drivers and a 1" HF. The 8" lo drivers are in series and mounted next to each other spaced 8.35" apart. Crossover from 8's to 1" is approx 2.5k. I know I have destructive interference issues on the lo side with the 8's but I would really like to pinpoint the frequency. I am toying with changing these to 3 way but there are other issues with driver isolation issues as the 8's share a chamber. I am open to suggestions here as they sound ok but would really like to take these to the next level if economically possible.
Thoughts, besides dumping these and getting something else?
Need a little help here, I have 40 manufactured line array cabinets with 2x8" lo drivers and a 1" HF. The 8" lo drivers are in series and mounted next to each other spaced 8.35" apart. Crossover from 8's to 1" is approx 2.5k. I know I have destructive interference issues on the lo side with the 8's but I would really like to pinpoint the frequency. I am toying with changing these to 3 way but there are other issues with driver isolation issues as the 8's share a chamber. I am open to suggestions here as they sound ok but would really like to take these to the next level if economically possible.
Thoughts, besides dumping these and getting something else?
Sharing a chamber shouldn't be a problem with same drivers.
I used pairs of Fane 12 inchers in 2 cabinets on a mobile disco for many years without any problems.
I used pairs of Fane 12 inchers in 2 cabinets on a mobile disco for many years without any problems.
Well, series connection is not much used, can burn out easily with a powerful amp, because when one speaker gets hotter its resistance rises and more and more of the output voltage will be across it, wheras the other speaker will be cooler.
When paralleled both will always have the same temperature (if they are similar).
Now modern tweeters for line arrays look different.
B&C Speakers
High Frequency Line Array Devices - Pro Audio Components
When paralleled both will always have the same temperature (if they are similar).
Now modern tweeters for line arrays look different.
B&C Speakers
High Frequency Line Array Devices - Pro Audio Components
Speaker coils shouldn't be getting that hot !
If the yare your using the wrong speakers.
I used serial connections in two cabinets that were 200WRMS for a mobile disco.
I drove it with a 225WRMS amplifier for a good 10 years without any problems.
The speakers got an absolute hammering some nights.
If the yare your using the wrong speakers.
I used serial connections in two cabinets that were 200WRMS for a mobile disco.
I drove it with a 225WRMS amplifier for a good 10 years without any problems.
The speakers got an absolute hammering some nights.
My thought behind that was that if I went 3 way then the driver that was doing mid duty was being excited by the lower frequencies that the other driver was reproducing thereby impeding its ability to clearly reproduce the frequency range that I was intending it to do. Short of somehow doing isloation with say a bucket or something i'm wondering if someone with real experience in this might chime in. Is it possible to measure how much distortion is being introduced into the scenario and if so how whould one measure it.
They usually have a baffle between different types of drivers.
You can buy systems with a mic and PC software for measuring distortion.
You can buy systems with a mic and PC software for measuring distortion.
The series issue doesnt bother me much as ive had this system for years and never blew an 8" speaker. The reasonI mentioned it was to make everybody aware that these 8" drivers wew indeed reproducing the same frequency range. Meyer does a similar thing in thier m2d and upm1. In both scenarios there are passive networks limiting the lower (i believe) freqs going to one of the drivers. Now that I think about it on both of those cabinets the drivers share the same chamber so maybe I shouldn't be that worried about proximity and cone vibration of the midrange driver. Granted the M2D was never a very popular line array.
If you put two same drivers in one box and cut the highs from just one of them, it isn't a problem. The upper woofer was intended to do bass anyway. The box doesn't get involved with the highs as long as there is some damping inside.
My compression drivers see more (peak) power than that.
To the OP, with 2x 8" drivers wired in series, consider putting a cap across one driver. That'll short it out (reducing signal, via the potential divider) as you get towards HF, so the effective side of the midrange driver gets smaller.
An alternative would be to use a chunkier 1" driver, and drop the crossover frequency.
Chris
My thought behind that was that if I went 3 way then the driver that was doing mid duty was being excited by the lower frequencies that the other driver was reproducing thereby impeding its ability to clearly reproduce the frequency range that I was intending it to do. Short of somehow doing isloation with say a bucket or something i'm wondering if someone with real experience in this might chime in. Is it possible to measure how much distortion is being introduced into the scenario and if so how whould one measure it.
Chris,
What Frequency whould you suggest and any thoughts on chunkier drivers that might be able to handle that? Currently using B&C DE 250, suggested Xover freq is 1.6k.
The other Chris