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Scott, beautiful set up! Do you have problems with phase? If I'm seeing this correctly the woofers are a fair distance back from the OBs. Can you share any more info on the electronic cross over manufactur / model? Thanks!
While the beaming of larger drivers should help avoid comb filtering, you're still going to have a large c2c distance if you do this....
Hello Browntrout,I have built open baffle line arrays using eight Visaton B200 full range drive units per line. These are nominally eight inch drive units and so this would be a theoretical no-no regarding comb effects. However, in practice they sound great and I am not finding any audible problems with combing effects at a listening distance of around twelve feet although you may find problems if your listening position is very close to the speakers.I decided to go for it with the B200 because I recalled using 10? and 12? drive units, in line arrays, as vocal PA speakers, when playing in a band as a youngster in the 60?s and 70?s. I cannot remember suffering any audible combing effects from these line arrays. I do remember they were excellent as PA speakers and that they were very articulate and coherent with voice.Out of interest, I wired my drive units in such a way that I could program series parallel/wiring or parallel wiring of the drive units, using 4mm plugs and sockets. It is very audibly obvious that wiring any drive units in series/parallel causes drive unit interaction that diffuses the image and makes it dynamically unstable. This problem does not occur if you wire the drive units in parallel as each drive unit sees the same drive signal from the amplifier. The whole line then behaves as one drive unit electrically. The image is very stable under all dynamic conditions. It does, however, present an awkward load to the amplifier, so I designed a power amplifier specifically to work into these low impedances. It may be that some of the audible problems attributed to combing effects are caused by series/parallel wiring of the drive units as line arrays tend to be wired in series/parallel to give an impedance that standard amplifiers can drive.RegardsPaul
And BTW, I heard a speaker like the one pictured below a few years ago at RMAF.
I am afraid that you (fullrangeman) and Paul are getting cancellation effects that will result in +/-15db swings (or more) from any measuring (or listening point). Keep in mind that the wave lengths in the top octave are only 1 to 2 inches long so a time delay of only 1 or 2 inches is all that it will take to create a good 15db hole in the response.
What are your opinion about this LineArray do you listen?
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