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Line array with these 3" drivers?
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<blockquote data-quote="thylantyr" data-source="post: 1598280" data-attributes="member: 560358"><p>goals:</p><p></p><p>*$300 for drivers</p><p></p><p>*no crossover</p><p></p><p>*mate to subwoofer</p><p></p><p>*provide ample midbass</p><p></p><p>*high sensitivity</p><p></p><p>Use the driver you posted and model eight of them in a ported box,</p><p></p><p>somewhere in the 1.5 cu. ft. range, somewhere in the 80hz tuning.</p><p></p><p>But, because the driver excursion is low you won't move much air</p><p></p><p>so I would design an artificial boost in midbass and let the port tuning</p><p></p><p>do some work to place less strain on the driver.</p><p></p><p>Tune for a midbass peak of +3dB to +6dB, you get extra 'umph' on midbass.</p><p></p><p>Change the tuning from 80hz to 90hz and you'll see what I mean. Use WinISD.</p><p></p><p>Next, for better sound I would make a dual chamber design. Four drivers</p><p></p><p>per chamber. That means each chamber is 0.75 cu. ft. tuned to 90hz.</p><p></p><p>Get a 4" x 2.5" port and place one in the back of the speaker box, centered</p><p></p><p>in each chamber, two rear ports total.</p><p></p><p>Place the speaker box near a wall or a corner of the room and you get some</p><p></p><p>loading effects for more midbass.</p><p></p><p>Whatever you do, make a 4 driver test box first and test the sound.</p><p></p><p>These are rough numbers, fine tune it as needed.</p><p></p><p>For ultimate SQ, you can polyfill the walls leaving the port open to breath.</p><p></p><p><a href="http://home.pacbell.net/lordpk/robarray/Rear_chamber-2.JPG" target="_blank">http://home.pacbell.net/lordpk/robarray/Rear_chamber-2.JPG</a></p><p></p><p>Those drivers are rated for 87dB sensitivity.</p><p></p><p>An eight line would calculate to;</p><p></p><p>10log8 .... a 9dB boost in sensivity for having 8 of them in a line.</p><p></p><p>electrical is.</p><p></p><p>I see these wiring options;</p><p></p><p>1 ohm</p><p></p><p>4 ohm</p><p></p><p>16 ohm</p><p></p><p>1 ohm = +9dB sensitivity</p><p></p><p>4 ohm = +3dB sensitivity</p><p></p><p>16 ohm = -3db sensitivity</p><p></p><p>Add the mutal coupling sensitivity [+9dB] + the electrical sensitivity [either 9, 3 or negative 3]</p><p></p><p>to get an idea on what final sensitivity is.</p><p></p><p>1 ohm;</p><p></p><p>87dB + 9dB +9dB = 105dB</p><p></p><p>4 ohm;</p><p></p><p>87dB + 9dB +3dB = 99dB</p><p></p><p>16 ohm;</p><p></p><p>87dB + 9dB -3dB = 93dB</p><p></p><p>Now you know why I did 1 ohm tweeters and 2 ohm mids on my array, to get a calculated</p><p></p><p>104dB.. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="thylantyr, post: 1598280, member: 560358"] goals: *$300 for drivers *no crossover *mate to subwoofer *provide ample midbass *high sensitivity Use the driver you posted and model eight of them in a ported box, somewhere in the 1.5 cu. ft. range, somewhere in the 80hz tuning. But, because the driver excursion is low you won't move much air so I would design an artificial boost in midbass and let the port tuning do some work to place less strain on the driver. Tune for a midbass peak of +3dB to +6dB, you get extra 'umph' on midbass. Change the tuning from 80hz to 90hz and you'll see what I mean. Use WinISD. Next, for better sound I would make a dual chamber design. Four drivers per chamber. That means each chamber is 0.75 cu. ft. tuned to 90hz. Get a 4" x 2.5" port and place one in the back of the speaker box, centered in each chamber, two rear ports total. Place the speaker box near a wall or a corner of the room and you get some loading effects for more midbass. Whatever you do, make a 4 driver test box first and test the sound. These are rough numbers, fine tune it as needed. For ultimate SQ, you can polyfill the walls leaving the port open to breath. [URL="http://home.pacbell.net/lordpk/robarray/Rear_chamber-2.JPG"]http://home.pacbell.net/lordpk/robarray/Rear_chamber-2.JPG[/URL] Those drivers are rated for 87dB sensitivity. An eight line would calculate to; 10log8 .... a 9dB boost in sensivity for having 8 of them in a line. electrical is. I see these wiring options; 1 ohm 4 ohm 16 ohm 1 ohm = +9dB sensitivity 4 ohm = +3dB sensitivity 16 ohm = -3db sensitivity Add the mutal coupling sensitivity [+9dB] + the electrical sensitivity [either 9, 3 or negative 3] to get an idea on what final sensitivity is. 1 ohm; 87dB + 9dB +9dB = 105dB 4 ohm; 87dB + 9dB +3dB = 99dB 16 ohm; 87dB + 9dB -3dB = 93dB Now you know why I did 1 ohm tweeters and 2 ohm mids on my array, to get a calculated 104dB.. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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Line array with these 3" drivers?
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