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  1. Following on from this post in the what are you building thread I thought I'd make a new thread as its gone on for a few posts. I did some "directivity" type plots of both the LTH142 horn and PH916 waveguide outdoors, using the lazy susan. Although my garden is pretty small it still is more open than my loungeroom. These were done at 2M distance, with no crossover except the 66uf protection capacitor, and smoothed to 12/octave for readability. Each reading is done rotated 7.5 degrees off axis, so I've got from 0 degrees (direct on axis) to 60 degrees available: Now I'm using a miniDSP EQ correction that makes the PH916 fairly flat on axis.. and I forgot to change this for the LTH142 when I switched over to this, which measures louder in the high frequencies. But it appears the PH916 has mostly better directivity as the FR falls off slower (narrower spread of lines), except it has more chaotic behaviour (notches appearing) above 12khz, while for the LTH142 although it has a notch on axis.. it actually gets smoother off axis at these high frequencies. I'm now toeing in my speakers @ 22.5 degrees to the listening position (and have adjusted the miniDSP EQ to suit), but as Paul mentioned getting the measurements across different angles has opened my eyes a bit. I'm still preferring the PH916, though it looks to me like for a more beamy response the LTH142 will actually give me more even high end frequency response. I'm currently set up crossing over at 700hz with a somewhat complicated MiniDSP EQ curve flattening out the response from the 800-3000 region. Still learning as I go here, but it's sounding pretty good.
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