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Car Audio Help
Enclosure Design & Construction
1st Tline design attempt
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<blockquote data-quote="shredder2" data-source="post: 8646564" data-attributes="member: 674047"><p>Quick question... the Sd, should I use the value in Winisd or measure 1/2 surround to 1/2 surround?.. I'm reading online that it could be off a bit and still be ok but doing multiple drivers add up and if the difference between the two is off say... 15in2 per... then 2 drivers have a 30in2 difference. So I suppose my question is how close do I have to get the line area to Sd?.. and if it's off should I err on the high side or under? Also slightly choking the port throat even just a touch will control/ adjust excursion?.. add some (just a touch) of snappiness?.. and can that be used as one way to size the length if say... you need to lose 14" to hit Fs. 29.5hz is low but I'm thinking 33hz is plenty low with a Tline.</p><p></p><p>On this one I did a quick and dirty guesstimate on Sd, as Winisd said 67in2 per... and that sounded low to me so I used a lil' less than 1/2 the diameter going from the surround center to center. The size I've always heard has been 113in2 of cone per so I thought that Sd in Winisd was off for sure... was I on the right track?</p><p></p><p><img src="https://snag.gy/BFcZOm.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>And realistically how strict is the " Qts of .40 and lower, and Qms of 7 and lower" rule if you're not lookin' for perfect SQ?.. also the tuning? as I go under FS a touch I'm sure it won't matter much but if I take a 49hz Fs driver and tune it to 30hz as long as the line is sized right-on or a touch under area will that be a bad thing?.. I'm looking for decent Sq of course but also those low-lows.</p><p></p><p>Sorry about the long winded post and multiple questions but I'm just lookin' to understand how small changes will affect the line BEFORE I build the thing.</p><p></p><p>Thank you in advance.</p></blockquote><p></p>
[QUOTE="shredder2, post: 8646564, member: 674047"] Quick question... the Sd, should I use the value in Winisd or measure 1/2 surround to 1/2 surround?.. I'm reading online that it could be off a bit and still be ok but doing multiple drivers add up and if the difference between the two is off say... 15in2 per... then 2 drivers have a 30in2 difference. So I suppose my question is how close do I have to get the line area to Sd?.. and if it's off should I err on the high side or under? Also slightly choking the port throat even just a touch will control/ adjust excursion?.. add some (just a touch) of snappiness?.. and can that be used as one way to size the length if say... you need to lose 14" to hit Fs. 29.5hz is low but I'm thinking 33hz is plenty low with a Tline. On this one I did a quick and dirty guesstimate on Sd, as Winisd said 67in2 per... and that sounded low to me so I used a lil' less than 1/2 the diameter going from the surround center to center. The size I've always heard has been 113in2 of cone per so I thought that Sd in Winisd was off for sure... was I on the right track? [IMG]https://snag.gy/BFcZOm.jpg[/IMG] And realistically how strict is the " Qts of .40 and lower, and Qms of 7 and lower" rule if you're not lookin' for perfect SQ?.. also the tuning? as I go under FS a touch I'm sure it won't matter much but if I take a 49hz Fs driver and tune it to 30hz as long as the line is sized right-on or a touch under area will that be a bad thing?.. I'm looking for decent Sq of course but also those low-lows. Sorry about the long winded post and multiple questions but I'm just lookin' to understand how small changes will affect the line BEFORE I build the thing. Thank you in advance. [/QUOTE]
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1st Tline design attempt
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