Help Me Hit the Lows

[Deto1992 5]

Just purchased a couple of eclipse 88120s in a custom enclosure. I threw it in today and, similar to my hdc3, I am lacking in low end output. The box is dual chambered,tuned to 34 hz, and each driver has about 1.6 cubes. I thought that I did not need to build a new box because the tuning of 34 hz is low enough to achieve the lows Im looking for. However, like i previously stated, Im lacking low end output. It seems like Im never going to be able to get the flat response Im looking for. Thanks for the help guys!

edit: The custom enclosure has two seperate ports, one for each driver. I could remove the divider between the two ports if that would help. But, as far as I know, that would only increase tuning and cause my drivers to continue peaking higher than desired.

Edited February 10, 2011 by Deto1992

[Deto1992 5]

no advicee guys? Do you need more info? Im really in some need of help heree

[swift 501]

You are probably gonna need more airspace and tuned lower. I am not familiar with those subs but 1.6cu seems small for a ported 12.

2.5cu at around 28-30hz would be better I would think.

[bassahaulic 155]

I will have a video up in about an hour of 2 12"s I did in my GF's Mustang.

VERY good lows and still tuned to 35Hz. Plays every note of Put On almost the exact same loudness.

[RAM_Designs 25]

4ft^3 common chamber with a 30hz tuning. Those Eclipses do not have stiff suspensions so they're going to need a lower tuned box to get low.

[Ohjay 116]

more internal volume, lower tuning?

[Notorious97200 339]

Just for your information : my 12" BTL N2 is in a 2.1 ft3 box tuned to 32 Hz, and it hits the lows sooooo well. I could not imagine this sub could play so low with so much output. Incredible !!!

And I had a 15" SSA Xcon (in a 3.1 ft3 box tuned to 32 Hz) just before on the same amp, in the same car.

Good luck !

[Deto1992 5]

4ft^3 common chamber with a 30hz tuning. Those Eclipses do not have stiff suspensions so they're going to need a lower tuned box to get low.

Alright not a problem. Just one question. Does it have any effect on output if one driver is in front of the port wall and one is not? I would think that there would be some conflict in such a design. Thanks for the help though.

Edited February 12, 2011 by Deto1992

[smashedz28 110]

another prefab box fail. get in touch with a box designer on here and build it yourself. should be able to get the most out of those subs that route.

[Deto1992 5]

another prefab box fail. get in touch with a box designer on here and build it yourself. should be able to get the most out of those subs that route.

Actually isnt a prefab. It is tuned at 34 hz, most prefabs are closer to 40 and thats why they lack low end output. I just dont know enough yet to determine the solution to the peaky output so i thought id ask.

[Dictator1992 6]

...First of all a good speaker that was design for a flat response is a xcon(just saying). Box seems too small tune it at about 30hz and add more port area that should do the trick, Also what kind of amp do you have? Does it have a subsonic filter on it?

Edited February 12, 2011 by Dictator1992

[Deto1992 5]

...First of all a good speaker that was design for a flat response is a xcon(just saying). Box seems too small tune it at about 30hz and add more port area that should do the trick, Also what kind of amp do you have? Does it have a subsonic filter on it?

I have a hifonics brutus and yes, it has a ssf which is currently set at 28 hz. When you say increase port area youre referring to the length of the port, correct? Because I do know that increasing port width generally increases tuning although that is also increasing port area.

[Dictator1992 6]

Width and length determine tuning and how much port area you have. More port area more air you will move thats the + the negative is it reduces your quality sound of your bass sometimes depends on how its built other stuff!

Increasing length of your port will lower your tuning, Decreasing will raise tuning.

[Deto1992 5]

Width and length determine tuning and how much port area you have. More port area more air you will move thats the + the negative is it reduces your quality sound of your bass sometimes depends on how its built other stuff!

Increasing length of your port will lower your tuning, Decreasing will raise tuning.

Yea I know hwo different lengtsh affect tuning, I was more interested in the actual width of the port. Assuming that I kept the port length the same, and increase in port width would raise tuning? Would it not? Because i do have the option of removing the divider between the two chambers of the box which would connect the two ports which were previously seperate and, in turn, increase port width. I considered this option until i realized that it would only raise tuning which wouldnt solve my probelm. Could the low end be lacking simply because there is not enough volume? And if I was to increase port length for each port which would lower tuning would this make up for the lack of volume? I am running over rated wattage to the drivers also which would call for a smaller volume. Or is that a shitty way to look at it?

[bassahaulic 155]

Width and length determine tuning and how much port area you have. More port area more air you will move thats the + the negative is it reduces your quality sound of your bass sometimes depends on how its built other stuff!

Increasing length of your port will lower your tuning, Decreasing will raise tuning.

This is utter myth, and is totally false.

[bassahaulic 155]

Give me your dimensions please and I will have a quick design for you. I can do more Sunday night since I am a state away helping a friend with his 160 music truck.

Here is 2 12"s I did in my GF's car.