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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Peter Morris" data-source="post: 145833" data-attributes="member: 652"><p>Re: 60 Degree DIY Mid Hi</p><p></p><p></p><p></p><p>Yes - the settings are the hard bit, and because the box is so clear and FIR settings sound so real any minor changes / errors stands out. It’seasier to get the IIR settings nice than the FIR settings, but once you get aset if FIR settings right, they are spectacular.</p><p></p><p>The low frequency end is tricky. It’s difficult to avoid the influence of nearby boundaries. If you are not careful you will end up cutting and boosting things you should not. When you measure the box stacked on top of a sub expect the low frequencies to measure about 6 dB more than the HF because of the boundary effect. There will also be some cancellation notches if the microphone is not on the ground; and if it’s on the ground you can’t measure the HF. </p><p></p><p>The best results I have achieved have been by measuring thebox at about 4m with the mic (and box) about 4m high (or more) and away from any boundaries. Then listen with music and your voice, make sure it sounds right with both. I typically use 1/6 octave smoothing but I also use 1 octave smoothing to ensure the energy across the spectrum is flat. Your hearing is will notice if the power response is not smooth in the coverage area. I don’t worry too much about things above 16KHz.</p><p></p><p>Sometimes Smaart / Systune will tell you that there is a dip in the response, but the box will sound better without the apparent correction EQ …. so listen carefully. I often ask someone else which sounds better.</p><p></p><p>After you have been listening for a while your brain seems to correct for some of the errors so you need to take a break and come back andlisten with fresh ears…</p><p></p><p>I used 60 degree boxes this weekend for a loud outdoor rock band - 2 per side on some double 18 subs. At 150 feet you could feel the snare drum, toms and kick drum hitting you in the chest! Not bad for a couple of speakers designed to be stick mounted. </p><p></p><p>It was the first time the bands engineer had used the boxes. He had a big smile on his face and was shaking his head in disbelief at the volume and clarity he was achieving.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 145833, member: 652"] Re: 60 Degree DIY Mid Hi Yes - the settings are the hard bit, and because the box is so clear and FIR settings sound so real any minor changes / errors stands out. It’seasier to get the IIR settings nice than the FIR settings, but once you get aset if FIR settings right, they are spectacular. The low frequency end is tricky. It’s difficult to avoid the influence of nearby boundaries. If you are not careful you will end up cutting and boosting things you should not. When you measure the box stacked on top of a sub expect the low frequencies to measure about 6 dB more than the HF because of the boundary effect. There will also be some cancellation notches if the microphone is not on the ground; and if it’s on the ground you can’t measure the HF. The best results I have achieved have been by measuring thebox at about 4m with the mic (and box) about 4m high (or more) and away from any boundaries. Then listen with music and your voice, make sure it sounds right with both. I typically use 1/6 octave smoothing but I also use 1 octave smoothing to ensure the energy across the spectrum is flat. Your hearing is will notice if the power response is not smooth in the coverage area. I don’t worry too much about things above 16KHz. Sometimes Smaart / Systune will tell you that there is a dip in the response, but the box will sound better without the apparent correction EQ …. so listen carefully. I often ask someone else which sounds better. After you have been listening for a while your brain seems to correct for some of the errors so you need to take a break and come back andlisten with fresh ears… I used 60 degree boxes this weekend for a loud outdoor rock band - 2 per side on some double 18 subs. At 150 feet you could feel the snare drum, toms and kick drum hitting you in the chest! Not bad for a couple of speakers designed to be stick mounted. It was the first time the bands engineer had used the boxes. He had a big smile on his face and was shaking his head in disbelief at the volume and clarity he was achieving. [/QUOTE]
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60 Degree DIY Mid Hi - AKA PM60
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