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<blockquote data-quote="Max Warasila" data-source="post: 214145" data-attributes="member: 3845"><p>Hello,</p><p></p><p>I am also making a 10" cabinet this summer. I think your issue last time your made measurements was definitely having to do with box reflections. I'd start with fiberglass insulation on the walls, just to see if you can get the higher order stuff to go away. Always my go-to for aggressive damping and reduction of reflections. Sometimes I've gotten decent results from 1.5" + of solid acoustic foam (the old d&b special!), but in my experience the insulation was much cheaper and made things easier due to it's "big stick" nature.</p><p></p><p>For measurement, I think it's really important to understand that your options are either to hoist the cabinet to 4-5 m and test at 1-2 m or do a mix of 2 m ground plane measurements for the LF (< 4 kHz) and 1 mgated IR measurements for the HF (> 1kHz). Testing Loudspeakers by <a href="https://www.google.com/search?rlz=1C1CHBF_enUS793US793&sxsrf=ALeKk01JvwhCxRUW3kR-SqtgL8IerL0ljg:1594931081745&q=Joseph+D%27Appolito&stick=H4sIAAAAAAAAAOPgE-LRT9c3NErKTUuKN89Q4tLP1TcwKsjOLqrSkslOttJPys_P1i8vyiwpSc2LL88vyrZKLC3JyC9axCrolV-cWpCh4KLuWFCQn5NZkr-DlREAVLvqJ1EAAAA&sa=X&ved=2ahUKEwjM0MWkzdLqAhVSmuAKHePHAj0QmxMoATARegQIDBAD" target="_blank">Joseph D'Appolito</a> is an excellent reference on the subject. I'd try and do raw driver measurements for each passband at 15 or 30 degree intervals to get a feel for what the box is doing, and how things will combine off axis. You can then use these to find the relative phase angle throughout your crossover (for your design, I'd probably choose at least 800 Hz because of the limitations of the AMT). If you're not interested in the polars (which I think you should be, personally) the best bet will be to simply use a gated IR measurement of each driver on axis at 2 m to find the Δt. The increased distance here is important because it reduces the error incurred from the vertical distance off axis of the 10" drivers. </p><p></p><p>I personally use ARTA for measurement - but that's just because I'm a cheapo! It's an excellent tool if you know what you're doing, though, and it's more than capable of matching the power of systems many times it's price with the right know how.</p></blockquote><p></p>
[QUOTE="Max Warasila, post: 214145, member: 3845"] Hello, I am also making a 10" cabinet this summer. I think your issue last time your made measurements was definitely having to do with box reflections. I'd start with fiberglass insulation on the walls, just to see if you can get the higher order stuff to go away. Always my go-to for aggressive damping and reduction of reflections. Sometimes I've gotten decent results from 1.5" + of solid acoustic foam (the old d&b special!), but in my experience the insulation was much cheaper and made things easier due to it's "big stick" nature. For measurement, I think it's really important to understand that your options are either to hoist the cabinet to 4-5 m and test at 1-2 m or do a mix of 2 m ground plane measurements for the LF (< 4 kHz) and 1 mgated IR measurements for the HF (> 1kHz). Testing Loudspeakers by [URL='https://www.google.com/search?rlz=1C1CHBF_enUS793US793&sxsrf=ALeKk01JvwhCxRUW3kR-SqtgL8IerL0ljg:1594931081745&q=Joseph+D%27Appolito&stick=H4sIAAAAAAAAAOPgE-LRT9c3NErKTUuKN89Q4tLP1TcwKsjOLqrSkslOttJPys_P1i8vyiwpSc2LL88vyrZKLC3JyC9axCrolV-cWpCh4KLuWFCQn5NZkr-DlREAVLvqJ1EAAAA&sa=X&ved=2ahUKEwjM0MWkzdLqAhVSmuAKHePHAj0QmxMoATARegQIDBAD']Joseph D'Appolito[/URL] is an excellent reference on the subject. I'd try and do raw driver measurements for each passband at 15 or 30 degree intervals to get a feel for what the box is doing, and how things will combine off axis. You can then use these to find the relative phase angle throughout your crossover (for your design, I'd probably choose at least 800 Hz because of the limitations of the AMT). If you're not interested in the polars (which I think you should be, personally) the best bet will be to simply use a gated IR measurement of each driver on axis at 2 m to find the Δt. The increased distance here is important because it reduces the error incurred from the vertical distance off axis of the 10" drivers. I personally use ARTA for measurement - but that's just because I'm a cheapo! It's an excellent tool if you know what you're doing, though, and it's more than capable of matching the power of systems many times it's price with the right know how. [/QUOTE]
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