5k is much too high. Look at this chart, the first graph. It's a bit difficult to read for 10", it would be a diagonal parallel to the 8", a bit to the left of it. At 3k it gets narrowed down to ~65°. How does that sound? Off-axis at that angle there's then a hole and if you go from one side to the other, the sound will change. Plus, the PD.103NR1 got resonances and distortion above ~1,9k but I don't know where, can't find the measurements anymore, the page is not online anymore. I would not xo higher than 2k.
If you set up your limiter correctly, you can probably get away with your BMS 4550, it's a good driver and sounds good. I mean, you've already got them, so give it a try. According to a quick Google search, a new diaphragm is about 70-80€.
If you set up your limiter correctly, you can probably get away with your BMS 4550, it's a good driver and sounds good. I mean, you've already got them, so give it a try. According to a quick Google search, a new diaphragm is about 70-80€.
lets say a 1000hz gives us 17 cm 1/2 wavelength between cone centers. if I angle that much the two drivers, could it be fine?
That doesn't help the horizontal beaming. Instead it makes it worse because the woofer plays to its off-axis to to the speakers forward direction. You have to imagine the dispersion as a 3D "structure" comming out of the drivers, not the box. Moving the drivers also moves an angles/pivots the drivers dispersion with it.
With a flat baffle, your idea to build it as 2,5 way (both working up to the lower mids, one woofer up to the horn driver) would work but you lose on efficiency and therefore on max spl, -6dB. That way your bms got enough headroom though.
Who will develop and measure the speakers?
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I think we're saying the same thing, but in opposite terms. What I was saying is that the 2x10" drivers arranged vertically keep the vertical dispersion narrow (by interference, as you've noted) about an octave below what the horn on its own can manage.
I agree on the RCF HF horns, though - the adapters are clumsy.
Chris
Maybe we were talking past each other. The vertical beamwidth shouldn't be a problem. With people there, dancing, listening there won't be reflections from the floor, even less outside (grass). Only a very low ceiling is a problem. The speakers should be tilted forward anyway. I've used these flanges, works great unless the speaker is too leight. They got a spring in it, you just need to lift the speaker slightly, tilt it and lower it again, it locks at the next notch. It's plastic but very rugged. Sorry, I disgress.
I like the 18s horns, I've got the XT120 here, it's cheap, doesn't resonate and the shiny surface is living room worthy. 😀 The edges go down to the baffle, no reflections from the edges of the horn, no need to route the baffle to make the horn flush with it (for HiFi, for PA practically noone does that). Downside is, on the road it gets ugly scratches and you can see them much better than on horns with a rough surface. 🙄 There's always something you don't like but have to swallow, it's every single time you have to compromise and choose the lesser evil you have to swallow.
