Port Length for Nightshade 18"

[thebiggmann12 14]

ok so i built a box for my new nightshade 18. it is just under 5 cubic feet before sub displacement but after port displacement. it is tuned to 31 hz b4 the sub. it sounds great. my question is if the port area is too small. the re calculator that i used said that the square port area was 55.5. idk if this means inches or what but im guessing inches. the sub performs great at higher frequencies but the lows are kinda lacking compared to the 18" fi q that i had before. any info would be great. also if somebody would be willing to design me an optimal box that would be great too. my dimensions are 36" wide 22" tall and 20" deep. sub and port would have to be facing up. i like the lower frequencies alot. i like my highs too but low lows (between 27ish and 38ish hz) are what i love. any help would be greatly appreciated. thanx.

[jcarter1885 995]

ok so i built a box for my new nightshade 18. it is just under 5 cubic feet before sub displacement but after port displacement. it is tuned to 31 hz b4 the sub. it sounds great. my question is if the port area is too small. the re calculator that i used said that the square port area was 55.5. idk if this means inches or what but im guessing inches. the sub performs great at higher frequencies but the lows are kinda lacking compared to the 18" fi q that i had before. any info would be great. also if somebody would be willing to design me an optimal box that would be great too. my dimensions are 36" wide 22" tall and 20" deep. sub and port would have to be facing up. i like the lower frequencies alot. i like my highs too but low lows (between 27ish and 38ish hz) are what i love. any help would be greatly appreciated. thanx.

Well if you would of did a little research before buying a subwoofer, then you would now a FI Q is an SQ sub while a Sundown Nightshade is a SPL sub so lows wont be near the same (not saying lows cant be put out by a nightshade but not its specialty). The 18 should be between 5 -6 ft^3 after all displacements, but personally I dont think you will grab the same lows with that Nightshade that you do with the Q.

[bassahaulic 155]

Port seems fine to me.

But the FS of NS 18"is low 40's, and the FS of the Q 18" is low mid 20's. That makes a HUGE difference.

[thebiggmann12 14]

yea i figured it was something like that but i have heard from a few people that they were low end monsters...o well not a big deal for me, but the nightshade does sound better than the q, definately hits a bigger margin of frequencies. but if the port area seams about right, then i will probably just build another box maybe tuned a bit lower, but overall about the same size and then do 45's in the corners and fiberglass the inside.

[jcarter1885 995]

yea i figured it was something like that but i have heard from a few people that they were low end monsters...o well not a big deal for me, but the nightshade does sound better than the q, definately hits a bigger margin of frequencies. but if the port area seams about right, then i will probably just build another box maybe tuned a bit lower, but overall about the same size and then do 45's in the corners and fiberglass the inside.

Watch how low you tune that box and how much power you give it, you might want to talk to Jacob about that one before you damage your nightshade.

[thebiggmann12 14]

alright will do. thanx.