american bass xfl 18???

[BOOMINGRANDPA 5,000+ posts]

I call AB and they gave me it needs to be in a 6.5 to 7 cu ft box tuned to 35-38hz and fs was 35 and qts was .47I'm wondering does this box look good or do I need to change somethings?

box dimensions: 17.5 tall x 41 wide x 28 deep with a 9 in port tuned to 36 hz does this sound right? I think the port is huge but I have no clue. it was made with re box calculator.

can u use a slot or square port would be better would need to be about 10"w x10"h or so

 

[shredder1 10+ year member]

ill be using a crescendo bc 2000 in a 97 explorer

Wired to 1 ohm?...

 

[1mounty]

Wired to 1 ohm?...

yes

 

[1mounty]

i don't understand? i need a 10 inch port your saying?

 

[shredder1 10+ year member]

i don't understand? i need a 10 inch port your saying?

I took the time to model it and you'll need a 13-15 ft3 net box to go with 100 in2 of port... PM sent

 

[BOOMINGRANDPA 5,000+ posts]

i don't understand? i need a 10 inch port your saying?

so shredder said just what i did 10x10" square port.. maybe fire sub up port back, show him pic of your box shredder..

 

[Hertz Mafia]

8cubes after displacement with roughly 100" or port will do nice.

 

[1mounty]

8cubes after displacement with roughly 100" or port will do nice.

yeah my last 18 was sub up port back but it was in a small box because i didn't really know what i was doing and then i had two 12s like that. they sounded really good but just didn't get low enough so i sold those and went back to another 18 and I'm just going to do this one right

 

[Boomin_tahoe 5,000+ posts]

yeah my last 18 was sub up port back but it was in a small box because i didn't really know what i was doing and then i had two 12s like that. they sounded really good but just didn't get low enough so i sold those and went back to another 18 and I'm just going to do this one right

Since nobody asked, do you have any sound goals with this new sub like you want the lows, or really low lows....just a daily ground pounder, etc?

 

[1mounty]

Since nobody asked, do you have any sound goals with this new sub like you want the lows, or really low lows....just a daily ground pounder, etc?

just a daily ground pounder

 

[Boomin_tahoe 5,000+ posts]

just a daily ground pounder

35-38 Hz is kinda high imo. Some people like lows, others in between. That sub in the enclosure recommended isn't gonna play extremely low bass, just an fyi. It'll hit the mid freq. no problem tho...and will be dam loud around 40-50 Hz.

 

[1mounty]

35-38 Hz is kinda high imo. Some people like lows, others in between. That sub in the enclosure recommended isn't gonna play extremely low bass, just an fyi. It'll hit the mid freq. no problem tho...and will be dam loud around 40-50 Hz.

Yea really want it to hit the lows pretty good

 

[shredder1 10+ year member]

Could anyone weigh in on this... I gave it a shot but it seems to be low in the port velocity area... Hey, I'm still learning to do this so any input would be appreciated... I tried... LOL!

Every time I adjust port area to get port velocity up it goes under 12in2 per foot in Torres... Unless I go to a HUGE enclosure...

 

[Jeffdachef 5,000+ posts]

[quote name='shredder1']Could anyone weigh in on this... I gave it a shot but it seems to be low in the port velocity area... Hey, I'm still learning to do this so any input would be appreciated... I tried... LOL!

Every time I adjust port area to get port velocity up it goes under 12in2 per foot in Torres... Unless I go to a HUGE enclosure...[/QUOTE]

shrink the port area. that 12-16 port per cube area doesnt always work its just a general guideline for newbies but if you can actually model air velocity you can get away with much less or know when to use a lot more(or less in this case). Just follow the air velocity. A lot of people get loud shrinking down to 8-10 port per cube Especially if they aren't throwing double the sub's rms. @Buck has done a few high airspace low port area builds with good success in output and sq.

 

[hispls 5,000+ posts]

[quote name='Jeffdachef']shrink the port area. that 12-16 port per cube area doesnt always work its just a general guideline for newbies but if you can actually model air velocity you can get away with much less or know when to use a lot more(or less in this case). Just follow the air velocity. A lot of people get loud shrinking down to 8-10 port per cube Especially if they aren't throwing double the sub's rms. @Buck has done a few high airspace low port area builds with good success in output and sq.[/QUOTE]

Anywhere where people recorded this, like taken pictures and notes? The only time I've gained from going with less port is when the larger port was too crowded and the smaller allowed better air flow at the end.

[quote name='1mounty']this is all they could give me is this enough? fs: 32.61, qts: .454, qes: .507, qmas: 4.377, vas: 136.476 L, 3 in coil and displacement .25[/QUOTE]

Looks to me like 7.5 cubes tuned 35hz ish will work nicely. Tuning lower will gain you very little low extension and you probably shouldn't tune above 40hz unless you have a plan.

I personally like big port area, but surely you can get away with 10" round, or possibly as low as 8" flared.