andym85 Posted April 11, 2007 Report Share Posted April 11, 2007 wat dis mean ^ n this *Lv = Av*1.84*10^8/[Vb*1728*(Fb/0.159)^2] - 0.823*sqrt(Av) that is the formula to find your tuning frequency Fb = tuning frequency Av = vent area Vb = net volume in cubic inches Lv = effective length of vent effective length = physical length + end correction <---1/2 of the ports width Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
had001 Posted April 11, 2007 Author Report Share Posted April 11, 2007 that is the formula to find your tuning frequencyFb = tuning frequency Av = vent area Vb = net volume in cubic inches Lv = effective length of vent effective length = physical length + end correction <---1/2 of the ports width but wat does * ,^, mean? Quote Link to comment Share on other sites More sharing options...
andym85 Posted April 11, 2007 Report Share Posted April 11, 2007 * = multiply ^ = raised to the power of Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
had001 Posted April 11, 2007 Author Report Share Posted April 11, 2007 i think i finally figured out my port lenght. 16.5x3x10, it comes to 39ish Hz. am i right or wrong Quote Link to comment Share on other sites More sharing options...
andym85 Posted April 11, 2007 Report Share Posted April 11, 2007 (edited) what are the dimensions of your box? 18*40*18?? if so, then yea, 39is is pretty close Edited April 11, 2007 by amatt85 Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
had001 Posted April 11, 2007 Author Report Share Posted April 11, 2007 what are the dimensions of your box? 18*40*18?? if so, then yea, 39is is pretty close The gross dimensions is 17.25x40.75x16.75. the net dimensions is 16.5x40x16. M i still close or back to the drawing board again Quote Link to comment Share on other sites More sharing options...
had001 Posted April 11, 2007 Author Report Share Posted April 11, 2007 is that for just one port for the whole box or both ports?????? Quote Link to comment Share on other sites More sharing options...
andym85 Posted April 12, 2007 Report Share Posted April 12, 2007 The gross dimensions is 17.25x40.75x16.75.the net dimensions is 16.5x40x16. M i still close or back to the drawing board again if the inner dimensions are 16.5*40*16, then the outer are gonna be 18*41.5*17.5 (if you are using 3/4" mdf)...you gotta add 1.5" to each dimension to get your outer, not just .75". so i put your inner dimensions at 16.5*38.5*16.5 for the box and got a tuning of about 38ish and a net volume of 5.765cubes (which includes displacement for the port and for the subs, i used .15cft for each sub which was just a guess) Quote i likes me some audio stuff... Link to comment Share on other sites More sharing options...
had001 Posted April 12, 2007 Author Report Share Posted April 12, 2007 I think i finally got. Can some one please check my measurements if there right. The box is suppose to be tuned to 39-40ish hz. M i right or wrong? Quote Link to comment Share on other sites More sharing options...
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