18abVFL Posted April 25, 2011 Report Share Posted April 25, 2011 Four (4) Rockford P1 S8 10" subs Rockford T500-1bdcp @ 2 ohms (600 rms) Im building a new box for my subs, and i have been using Torres and WinIsd. I cant seem to figure out what "1st port resonance" means. I'm trying to tune down to 32 or 33 hz, and i have many workable porting options, but i dont know where my port resonance should be at. i have a few different designs, resonances ranging from 280hz-600hz. somebody help? Quote 1999 Monte Carlo Sony CDX-GT34w 2 Alpine Type R 12"s in 4 cubes tuned to 35hz American Bass VFL 80.1 amp @ 1 ohm (probably doing between 1000 and 1300rms) Stock alt, Stock batt, Big 3 Upgrade Boston s55- 5 1/4s (doors) Boston s95- 6x9s (rear deck) Link to comment Share on other sites More sharing options...
zrkie Posted April 25, 2011 Report Share Posted April 25, 2011 (edited) quite simplified it means the next frequency which the port will emphasize, due to it matches a quarter wavelength of sound. U get different first resonances cuz of different lenghts of the port. However, as u see those numbers are quite high. The sub wont be playing any 300hz frequencier (u are using lowpass filter), however... in a speaker where u actually would be playing in that frequency range, this 1st port resonance might come into play. But for subboxes, it can be completely discarded. Edited April 25, 2011 by zrkie Quote Don't like sharing your knowledge? Welll.. Don't come here and grab others then! - GTFO. Link to comment Share on other sites More sharing options...
Supercharged DCs Posted April 25, 2011 Report Share Posted April 25, 2011 Port resonance shouldn't matter in a subwoofer-based enclosure Quote Bassless once again. Can't seem to keep a system for more than a few weeks Saving for a '06 Nissan 350z, look for build around June 2012. Link to comment Share on other sites More sharing options...
18abVFL Posted April 26, 2011 Author Report Share Posted April 26, 2011 quite simplified it means the next frequency which the port will emphasize, due to it matches a quarter wavelength of sound. U get different first resonances cuz of different lenghts of the port. However, as u see those numbers are quite high. The sub wont be playing any 300hz frequencier (u are using lowpass filter), however... in a speaker where u actually would be playing in that frequency range, this 1st port resonance might come into play. But for subboxes, it can be completely discarded. awesome thanks, also, a higher 1st port resonance wont effect my low notes, right? Quote 1999 Monte Carlo Sony CDX-GT34w 2 Alpine Type R 12"s in 4 cubes tuned to 35hz American Bass VFL 80.1 amp @ 1 ohm (probably doing between 1000 and 1300rms) Stock alt, Stock batt, Big 3 Upgrade Boston s55- 5 1/4s (doors) Boston s95- 6x9s (rear deck) Link to comment Share on other sites More sharing options...
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