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View Full Version : 4th order bandpass port area?



Supergumby5000
12-04-2009, 11:46 PM
Is there any rule of thumb i should follow in terms of port area when designing a 4th order?

:D:D:D

hatemonger
12-05-2009, 12:18 AM
as large as you have the space for. it might not be good to exceed the cone area of the sub/s.

Supergumby5000
12-05-2009, 12:44 AM
as large as you have the space for. it might not be good to exceed the cone area of the sub/s.

port area: 250sq in

sub cone area: roughly 1k sq in


that gonna be okay? :crap:

just playing with large 4th order designs and trying to get the hang of it

Supergumby5000
12-05-2009, 01:49 AM
bumpskeez

hatemonger
12-05-2009, 11:28 AM
250 will probably be ok. 1/4 cone area is on the low end. all of your sound is coming out of that 1 port, so make it as large as you can.

amartin_72
12-05-2009, 11:33 AM
How have the two setups in your avalanche sounded? Did they sound like regular ported 15" type r's with all lows nothing over 55hz or did they sound decent?. Do the dc's sound better? I like your designs better than trying a 4th order, sealing off half the sub is never good for output.

galacticmonkey
12-05-2009, 11:45 AM
Port area doesnt go by cone area. It goes by size of ported airspace. The air in the ported area is "excited" by the sub, and the larger the ported area the more air it excited, therefore it needs a bigger port.

galacticmonkey
12-05-2009, 11:47 AM
How have the two setups in your avalanche sounded? Did they sound like regular ported 15" type r's with all lows nothing over 55hz or did they sound decent?. Do the dc's sound better? I like your designs better than trying a 4th order, sealing off half the sub is never good for output.

Thats why all the loudest vehicles and most 159.9 Bassracers except for a few are all 4th orders? :confused:

Canaan
12-05-2009, 12:03 PM
Thats why all the loudest vehicles and most 159.9 Bassracers except for a few are all 4th orders? :confused:

Yep. Big 4th order walls are fun.
Can be designed for VERY flat response, depending on the sub(s).

amartin_72
12-05-2009, 02:23 PM
I heard two rockford p3 12's in a q-logic 4th order bandpass. Sounded sealed but kinda loud. sounded good im afraid to admit it. He had 2k on them though.

Supergumby5000
12-05-2009, 08:14 PM
Yep. Big 4th order walls are fun.
Can be designed for VERY flat response, depending on the sub(s).

ive been playing with the designs a bit, and i'll have to go take some measurements to really maximize the port (if i even do this design).

I am going to guess ill be spamming your PM box over the next couple weeks, so be ready for it ;)

Supergumby5000
12-05-2009, 08:16 PM
How have the two setups in your avalanche sounded? Did they sound like regular ported 15" type r's with all lows nothing over 55hz or did they sound decent?. Do the dc's sound better? I like your designs better than trying a 4th order, sealing off half the sub is never good for output.

both of the boxes did very well for what they were designed for. the R's DESTROYED the lows, hard.

the DC's are tuned to peak quite a bit higher, and have much more high frequency output than the R's, but the lows arent the same. I'de have to say this setup is more loud to the ear.

Between the two setups, i've found i really do like low end bass :D

galacticmonkey
12-06-2009, 09:18 PM
If you come up with a design, send it to me and Ill check it out.