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How much volume needed for 9 NSB's
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<blockquote data-quote="thylantyr" data-source="post: 1219873" data-attributes="member: 560358"><p><strong>9 NSB's per tower</strong></p><p></p><p>That works if you need 8 ohms. If you are able to drive 4 ohms I'd do an 8 line</p><p></p><p>with an impedance switch to select 4 ohm or 1 ohm only to offer more punishment if you had a beefy amplifier.</p><p></p><p><strong>with one tweet in each (haven't decided on which tweet </strong></p><p></p><p>A 9 line NSB array is ~ 95.5dB sensitivity so ideally you want a tweeter of</p><p></p><p>equal or greater sensitivity if you do a passive crossover design. If active,</p><p></p><p>then it's moot. You can use a horn tweeter if it has the response and SQ</p><p></p><p>you like, but they may be louder so you'd need a variable L-pad to adjust the</p><p></p><p>tweeter volume to mate with the midrange volume {fine tuning}.</p><p></p><p><strong> or where to cross it over at...ideas?</strong>//content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif<strong> ) </strong></p><p></p><p>Low pass -&gt; whatever you want and it will work. But your tweeter might</p><p></p><p>dictate this. ie, if your tweeter chosen sounds good at 2khz, then do 2khz for</p><p></p><p>NSB's. If your tweeter sounds good only at 5khz, then do 5khz on the NSB,</p><p></p><p>but if you want to keep the design 'proper' use the line array spacing formula;</p><p></p><p>13560/driver center to center spacing.</p><p></p><p>If your NSB's are 4.5" c-t-c spaced, 13560/4.5" = ~3Khz .. try to keep the crossover under 3khz on the NSB's.</p><p></p><p>High pass -&gt; Depends on slope and power you drive into the NSB. Steeper</p><p></p><p>slopes can allow lower crossover point to keep cone excursion low. For example,</p><p></p><p>an 8th order {48dB/octave slope} can be used at 65hz, a 18dB/octave slope</p><p></p><p>try to keep up over 100hz, maybe 150hz. For 6dB/12dB, even higher.</p><p></p><p>These are just guidelines. If you don't push the array hard, run the NSB's with</p><p></p><p>no high pass and just keep the volume real by not overdriving the cones,</p><p></p><p>a judgement call.</p><p></p><p><strong>How much volume does 9 NSB's need? </strong></p><p></p><p>The 95.5dB sensitivity means that at 1 watt/1 meter you produce ~95dB SPL.</p><p></p><p>Is this loud enough? if not drive 2 watts, 10watts, 100watts until you either</p><p></p><p>blow up the drivers or reach a SPL level that you are happy with. /hehe</p><p></p><p><strong>Does this idea look like it will work?</strong></p><p></p><p>You can make it work.</p><p></p><p><strong>What type of wood would be best?....1/2" mdf, baltic birch, or what?</strong></p><p></p><p>If you are skilled, you can use any wood. Particle board, plywood, MDF, etc.</p><p></p><p>If you want better performance then I'd make a deeper cabinet to help</p><p></p><p>disperse standing waves, use MDF to lower cabinet resonance and use</p><p></p><p>a chambered design where you have three chambers, three NSB per chamber</p><p></p><p>as the two internal shelfs will help lower cabinet resonance because they act</p><p></p><p>as braces. Within each chamber, add a 1" dowel in the center to couple the side</p><p></p><p>walls, but this dowel so it's a very tight fit when you install it and screw/glue it in</p><p></p><p>place. This reduces cabinet reasonance lower and it's cheap to do.</p><p></p><p>If sealed or ported box, poly fill loosely. If you made a hybrid ported/open baffle,</p><p></p><p>then don't polyfil, rather make sound conditioning pillows for each wall, it's pretty cool the hybrid box - but not all designs can be made to use it.</p></blockquote><p></p>
[QUOTE="thylantyr, post: 1219873, member: 560358"] [B]9 NSB's per tower[/B] That works if you need 8 ohms. If you are able to drive 4 ohms I'd do an 8 line with an impedance switch to select 4 ohm or 1 ohm only to offer more punishment if you had a beefy amplifier. [B]with one tweet in each (haven't decided on which tweet [/B] A 9 line NSB array is ~ 95.5dB sensitivity so ideally you want a tweeter of equal or greater sensitivity if you do a passive crossover design. If active, then it's moot. You can use a horn tweeter if it has the response and SQ you like, but they may be louder so you'd need a variable L-pad to adjust the tweeter volume to mate with the midrange volume {fine tuning}. [B] or where to cross it over at...ideas?[/B][IMG]//content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif[/IMG][B] ) [/B] Low pass -> whatever you want and it will work. But your tweeter might dictate this. ie, if your tweeter chosen sounds good at 2khz, then do 2khz for NSB's. If your tweeter sounds good only at 5khz, then do 5khz on the NSB, but if you want to keep the design 'proper' use the line array spacing formula; 13560/driver center to center spacing. If your NSB's are 4.5" c-t-c spaced, 13560/4.5" = ~3Khz .. try to keep the crossover under 3khz on the NSB's. High pass -> Depends on slope and power you drive into the NSB. Steeper slopes can allow lower crossover point to keep cone excursion low. For example, an 8th order {48dB/octave slope} can be used at 65hz, a 18dB/octave slope try to keep up over 100hz, maybe 150hz. For 6dB/12dB, even higher. These are just guidelines. If you don't push the array hard, run the NSB's with no high pass and just keep the volume real by not overdriving the cones, a judgement call. [B]How much volume does 9 NSB's need? [/B] The 95.5dB sensitivity means that at 1 watt/1 meter you produce ~95dB SPL. Is this loud enough? if not drive 2 watts, 10watts, 100watts until you either blow up the drivers or reach a SPL level that you are happy with. /hehe [B]Does this idea look like it will work?[/B] You can make it work. [B]What type of wood would be best?....1/2" mdf, baltic birch, or what?[/B] If you are skilled, you can use any wood. Particle board, plywood, MDF, etc. If you want better performance then I'd make a deeper cabinet to help disperse standing waves, use MDF to lower cabinet resonance and use a chambered design where you have three chambers, three NSB per chamber as the two internal shelfs will help lower cabinet resonance because they act as braces. Within each chamber, add a 1" dowel in the center to couple the side walls, but this dowel so it's a very tight fit when you install it and screw/glue it in place. This reduces cabinet reasonance lower and it's cheap to do. If sealed or ported box, poly fill loosely. If you made a hybrid ported/open baffle, then don't polyfil, rather make sound conditioning pillows for each wall, it's pretty cool the hybrid box - but not all designs can be made to use it. [/QUOTE]
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