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im happy with my JL Audio 10w7, but...

Aharami

Aharami

Lifer
i think its too boomy. I was looking for tight base. I dunno if its the enclosure I built, or whether its cuz the 10w7 i bought was used...
the enclosure I built is more or less to JL recommended specs: 1.32 cu ft internal volume. JL recommends 1.25 cu ft internal vol without taking into consideration the sub displacement. Since the cone displaces .09 cu ft, i made the total internal vol of the sub as 1.32 - 1.34 cu ft. Its a sealed box.

Now im thinking maybe I should've made the box a bit smaller - maybe 1 cu ft total internal vol (so after cone displacement, I'd be left with .91 cu ft internal vol)

Would the base response get tighter if I reduce the size of the box? Friend has an Alpine type-X and he claims that his sub got a lot tighter after he reduced the enclosure volume.


Also I should mention that I JUST finished putting it in and hooking everything up. So I havent had the chance to play with the settings on my amp. I have an Alpine MRD-M1005 powering the 10w7.

 
Originally posted by: spidey07
put some poly fill in the sub. That will help.
Click to expand...

correct me if Im wrong, but doesnt polyfill "make the sub think" that the internal vol is actually bigger than it is?

the question really is what kind of enclosure produces tighter, more accurate base response? Does the base get more boomy as you increase the internal vol?
 
The larger the box the better.
The best is no box at all, use the trunk as the enclosure.
The next thign to do is anylyse the system with an RTA.
Then, you can probably fix it with a pair of mono EQs, like Audio COntrol EQTs.
 
Originally posted by: Aharami
Originally posted by: spidey07
put some poly fill in the sub. That will help.
Click to expand...

correct me if Im wrong, but doesnt polyfill "make the sub think" that the internal vol is actually bigger than it is?

the question really is what kind of enclosure produces tighter, more accurate base response? Does the base get more boomy as you increase the internal vol?
Click to expand...
Adding stuffing is the equivalent of increasing enclosure volume, which reduces the Q of the box (Q of 0.5 = critically damped, Q of 0.7 = maximally flat response, anything higher leads to peakiness).

I'll put up some graphs in a bit.

EDIT: The "room gain" of the car will make the bass sound much louder and might be contributing to the boominess.

http://www.rootminus1.com/howard/pics/jl10w7sealed.gif
 
Originally posted by: glen
The larger the box the better.
The best is no box at all, use the trunk as the enclosure.
The next thign to do is anylyse the system with an RTA.
Then, you can probably fix it with a pair of mono EQs, like Audio COntrol EQTs.
Click to expand...

better is a subjective word. please explain what you mean by better? better as in tighter, more accurate response? I listen to a lot of Trance with faster beats than what you'd find say in Rap or Hip Hop. For Rap and Hip Hop I guess the base response would be fine since the beats are spread apart, but with the music I listen to, I feel I need tighter base response
 
Originally posted by: Howard
Originally posted by: Aharami
Originally posted by: spidey07
put some poly fill in the sub. That will help.
Click to expand...

correct me if Im wrong, but doesnt polyfill "make the sub think" that the internal vol is actually bigger than it is?

the question really is what kind of enclosure produces tighter, more accurate base response? Does the base get more boomy as you increase the internal vol?
Click to expand...
Adding stuffing is the equivalent of increasing enclosure volume, which reduces the Q of the box (Q of 0.5 = critically damped, Q of 0.7 = maximally flat response, anything higher leads to peakiness).

I'll put up some graphs in a bit.
Click to expand...
You are absolutely right about the Q.
Folks also equate this with the boomey or not boomey sound, so you are right again.
Did you know that in controlled tests, there is no study that showed a human as being about to hear the differences in Q.

 
Originally posted by: Aharami
Originally posted by: glen
The larger the box the better.
The best is no box at all, use the trunk as the enclosure.
The next thign to do is anylyse the system with an RTA.
Then, you can probably fix it with a pair of mono EQs, like Audio COntrol EQTs.
Click to expand...

better is a subjective word. please explain what you mean by better? better as in tighter, more accurate response? I listen to a lot of Trance with faster beats than what you'd find say in Rap or Hip Hop. For Rap and Hip Hop I guess the base response would be fine since the beats are spread apart, but with the music I listen to, I feel I need tighter base response
Click to expand...

Google "infinate baffle" and you will get your fill of information

 
1.3 cuft seems awfully large for a sealed 10" enclosure. Are you sure that wasn't the recommendation fora ported enclosure? I have a 10" Image Dynamics sub in a 0.55 cuft sealed enclosure.

 
This is a bit of a stretch, but do you know the frequency of the bass line of the stuff you're listening to? Or does it vary?
 
accurate response = fidelity? Go with a smaller box if you're into trance. Oh as someone mentioned, about the dimensions for the ported vs sealed...sealed is what people seemed to like when i installed for trance listeners.
 
Originally posted by: Howard
Originally posted by: Acanthus
Originally posted by: Aharami
Originally posted by: James3shin
actually, what do you mean by "tighter bass"? Are you looking for more isolated thumps?
Click to expand...

yes
Click to expand...

adjust the EQ

if that doesnt work

you need mids.
Click to expand...
Maybe he just needs to reduce the gain on the sub amp.
Click to expand...

That could be, im thinking the bass response on the sub is too high, so its getting washy instead of having "punch".
 
There is a special tool which is made for the purpose of diagnosing the problem with the sound; it is called an RTA. It escapes me why folks won't use one.
 
Originally posted by: glen
There is a special tool which is made for the purpose of diagnosing the problem with the sound; it is called an RTA. It escapes me why folks won't use one.
Click to expand...

never heard of it until now. So where can I get one and how much does it cost? Im just getting into audio now so Im learning as I go along.
 
Originally posted by: Howard
Originally posted by: Aharami
Originally posted by: spidey07
put some poly fill in the sub. That will help.
Click to expand...

correct me if Im wrong, but doesnt polyfill "make the sub think" that the internal vol is actually bigger than it is?

the question really is what kind of enclosure produces tighter, more accurate base response? Does the base get more boomy as you increase the internal vol?
Click to expand...
Adding stuffing is the equivalent of increasing enclosure volume, which reduces the Q of the box (Q of 0.5 = critically damped, Q of 0.7 = maximally flat response, anything higher leads to peakiness).

I'll put up some graphs in a bit.

EDIT: The "room gain" of the car will make the bass sound much louder and might be contributing to the boominess.

http://www.rootminus1.com/howard/pics/jl10w7sealed.gif
Click to expand...

do you have any links that explain what all these terms mean? I can just google, but askign just in case you know...
 
Originally posted by: Aharami
Originally posted by: glen
There is a special tool which is made for the purpose of diagnosing the problem with the sound; it is called an RTA. It escapes me why folks won't use one.
Click to expand...

never heard of it until now. So where can I get one and how much does it cost? Im just getting into audio now so Im learning as I go along.
Click to expand...


They are about $1,000
here is one for sale at Amazon:
http://www.amazon.com/exec/obidos/ASIN/...0/wwwgoodcheapd-20/103-7729036-4187023
I bought that exact model for $500 from a place that was going to use it for a movie prop, but never did.
Someone in your town has one and knows how to use it.
Any car audio store should have one and know how to use it.
If they don't refuse to do buisness with them.
 
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