port resonance above crossover

i4gotmyid · 29th November 2007, 03:05 PM

Ok, maybe this is a dumb question, but i searched and couldnt find the answer...although, I didnt know what to ask, which may have hindered my search.

My question is, take a woofer, say, scanspeak 18w8535, in a 40L ported box. If the port is set at 1", the resonance according to unibox is 3813hz. If I am crossing the driver over at 2000hz, does this resonance matter? How would this effect the speaker, if at all? According to unibox, it would pretty much be a flat response to 30hz.

I guess the question is, if the port resonance is above the crossover of the woofer does it still affect the whole speaker?

augerpro · 29th November 2007, 07:30 PM

Depends on the roll off your using too. Also harmonic distortion can excite resonances.

1" is fairly small, I would review teh port speed at maximum excursion. Port chuffing in this case will be more audible than the resonance.

29th November 2007, 03:05 PM	#1
i4gotmyid diyAudio Member Join Date: Oct 2006	port resonance above crossover Ok, maybe this is a dumb question, but i searched and couldnt find the answer...although, I didnt know what to ask, which may have hindered my search. My question is, take a woofer, say, scanspeak 18w8535, in a 40L ported box. If the port is set at 1", the resonance according to unibox is 3813hz. If I am crossing the driver over at 2000hz, does this resonance matter? How would this effect the speaker, if at all? According to unibox, it would pretty much be a flat response to 30hz. I guess the question is, if the port resonance is above the crossover of the woofer does it still affect the whole speaker?

29th November 2007, 07:30 PM	#2
augerpro diyAudio Member Join Date: Aug 2006	Depends on the roll off your using too. Also harmonic distortion can excite resonances. 1" is fairly small, I would review teh port speed at maximum excursion. Port chuffing in this case will be more audible than the resonance. __________________ ~Brandon DriverVault Soma Sonus Old Driver Tests

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