Please help on sonosub real quick

[solidcrowd 10+ year member]

Alright I have 4 ehqs8s and am going to use them for HT. I bought a sonotube and its 5 feet high and 18inches in diameter. I've seen that calculator but I don't really know how to use it. So I was wondering if someone could tell me what to tune it at and how tall it should be for 4 or should I leave it 5 ft. OR should I make 2 sonosubs out of this one tube?

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[lilmaniac2 5,000+ posts]

for ht tune ~20hz

 

[solidcrowd 10+ year member]

for ht tune ~20hz

someone on here said that tunning under 35hz for 8s is retarded. So did he mean just for in the car? or if this is true should i still go on with this project?

 

[lilmaniac2 5,000+ posts]

For HT if you want the full effect you want to tune lower. the 8s have a fs of 32 hz IIRC, tuning to 20 hz will probably lose some output, those subs are not ideal for true HT use, but hey they were 5 bucks whats it gonna hurt?

 

[Rich B 5,000+ posts]

Im wondering how you plan on placing 4 subs onto a single tube.

Its not unheard of to use both the top and bottom in mounting subs, so where do the other 2 end up?

 

[Immacomputer 10+ year member]

You don't have enough airspace to get any decent low end out of those subs if you use all four. That's only about 2.8 cubes for the tube and that's before port. If I had four of them, I would shoot for about 10 cubes tuned to 25hz. Leaving them sealed in that sonotube will really kill the low end output as well. They're not the best subs to choose if you want to save space. Keep in mind that box volume should NOT be determined by cone area.

 

[solidcrowd 10+ year member]

alright then i'll try it out, also on here some else used winsid and it came up with something like 4 cubes to get a flat response from 2 of these 8's. So should I keep this sonotube 5ft tall?

 

[solidcrowd 10+ year member]

You don't have enough airspace to get any decent low end out of those subs if you use all four. That's only about 2.8 cubes for the tube and that's before port. If I had four of them, I would shoot for about 10 cubes tuned to 25hz. Leaving them sealed in that sonotube will really kill the low end output as well. They're not the best subs to choose if you want to save space. Keep in mind that box volume should NOT be determined by cone area.

so how would 2 8's in each tube sound if i bought another sonotub?

 

[AudioXtremes 10+ year member]

Whoever heard tuning under 35hz for 8s Is retarded is retarded.

Depending on internal diameter its well over 8cf at 5ft long. Way to big.

 

[AudioXtremes 10+ year member]

You don't have enough airspace to get any decent low end out of those subs if you use all four. That's only about 2.8 cubes for the tube and that's before port. If I had four of them, I would shoot for about 10 cubes tuned to 25hz. Leaving them sealed in that sonotube will really kill the low end output as well. They're not the best subs to choose if you want to save space. Keep in mind that box volume should NOT be determined by cone area.

Where do you get 2.8? 18" diameter 5ft tall is over 8cf.

Now that I look at their specs the tube actually may be perfect. Also I can fit 4 8"s in a 18" circle.

 

[bonesninja 5,000+ posts]

Where do you get 2.8? 18" diameter 5ft tall is over 8cf.
Now that I look at their specs the tube actually may be perfect. Also I can fit 4 8"s in a 18" circle.

i was wondering that as well...9*9*3.14*60/1728=8.83125cf?

 

[Immacomputer 10+ year member]

Because I'm an idiot and didn't do 5ft height and did 19" for some reason! You could do 8 cubes at 25hz and that should sound decent but the low end may still be struggling some. With that size, power handling won't be the best either but it should be pretty efficient.

 

[bonesninja 5,000+ posts]

Because I'm an idiot and didn't do 5ft height! You could do 8 cubes at 25hz and that should sound decent but the low end may still be struggling some. With that size, power handling won't be the best either but it should be pretty efficient.

Its ok....a rare slip up from the computer. mostly, you're right on point

 

[solidcrowd 10+ year member]

Because I'm an idiot and didn't do 5ft height! You could do 8 cubes at 25hz and that should sound decent but the low end may still be struggling some. With that size, power handling won't be the best either but it should be pretty efficient.

alright then i'll use this, so what plate amp should i buy for these?

 

[solidcrowd 10+ year member]

ooo and i forgot to ask how long the port should be and what diameter, I want to buy it online, maybe partexpress, or am I going to have to make one?