TheyDontWantMusic Posted July 20, 2011 Report Share Posted July 20, 2011 my 50Hz is 6dB down from 30,40,60 and 70Hz. Quote Link to comment Share on other sites More sharing options...
145dbat30hz Posted July 20, 2011 Author Report Share Posted July 20, 2011 my 50Hz is 6dB down from 30,40,60 and 70Hz. why is that Quote Link to comment Share on other sites More sharing options...
TheyDontWantMusic Posted July 20, 2011 Report Share Posted July 20, 2011 my 50Hz is 6dB down from 30,40,60 and 70Hz. why is that but is missing 50Hz completely, and I can't work out why! Quote Link to comment Share on other sites More sharing options...
145dbat30hz Posted July 20, 2011 Author Report Share Posted July 20, 2011 my 50Hz is 6dB down from 30,40,60 and 70Hz. why is that but is missing 50Hz completely, and I can't work out why! oh ok u dont know either lol my bad so is a 4th order the way to go or not Quote Link to comment Share on other sites More sharing options...
6berry Posted July 20, 2011 Report Share Posted July 20, 2011 4th order would get my vote. ive read his build thread and its a mystery why hes missing 50hz so its not like its a common problem. Quote 1999 Audi A4 1.8T::: 4 - DC Level 3 10's in a 4th order Rockford P6002 on Subs for now (3-3.5k coming eventually) MB Quart ONX4.60 for Mids and Highs Boston S50 Components in Front Boston S65 Coaxials in Rear 40 Sq Ft of Second Skin Damplifier Build Thread UBL 1948 Plymouth Link to comment Share on other sites More sharing options...
145dbat30hz Posted July 20, 2011 Author Report Share Posted July 20, 2011 ok so 2:1 ratio and you just figure the tuning for the ported chamber how much port area do i need per cu ft Quote Link to comment Share on other sites More sharing options...
6berry Posted July 20, 2011 Report Share Posted July 20, 2011 yeah just use the ported side to find tuning just like a regular ported box. i think port area should be between 15-20 sq in per cube Quote 1999 Audi A4 1.8T::: 4 - DC Level 3 10's in a 4th order Rockford P6002 on Subs for now (3-3.5k coming eventually) MB Quart ONX4.60 for Mids and Highs Boston S50 Components in Front Boston S65 Coaxials in Rear 40 Sq Ft of Second Skin Damplifier Build Thread UBL 1948 Plymouth Link to comment Share on other sites More sharing options...
145dbat30hz Posted July 20, 2011 Author Report Share Posted July 20, 2011 ok thanks for the help Quote Link to comment Share on other sites More sharing options...
420c Posted July 25, 2011 Report Share Posted July 25, 2011 that drop off in frequency has something to do with the passband ripple unfortunately i dont know enough to explain it except somtimes you end up with peaks and valleys between upper and lower roll off. Quote Link to comment Share on other sites More sharing options...
RAM_Designs Posted July 25, 2011 Report Share Posted July 25, 2011 Could just be cancellation issues as well, either inside the box or out. Quote Ryan Miskin - owner of RAM Designs I have my PM's turned off, please email at <script data-cfhash='f9e31' type="text/javascript"> /* */</script> 2200+ designs since March 2011... Link to comment Share on other sites More sharing options...
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