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Reload Thread: adding a 4th sub, do chamber specs need to match other 3 to sound good?

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    adding a 4th sub, do chamber specs need to match other 3 to sound good?

    Considering adding a 4th subwoofer of the same kind as my other 3. I have 3 in the boot each in an approx 1.8cf chamber tuned to 32hz so I have no remaining boot space. My idea is to make sort of an arm rest for the back seats which will actually be a sub box. My question is when adding the 4th sub if the box size/tuning needs to be the same as the others to sound good with the others (same freq response) or if i can take advantage of having more space available there and make a larger box to sound better (more efficiency/hits lower than other 3). The 4th sub will be on its own amplifer, the other 3 are on a single amp as well.

    Cheers.







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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    not quite sure what you are asking? Are you basically trying to add another sub on the inside of the car and keep the 3 in the trunk? I would focus on making the 3 in the trunk sound best before adding another sub with its own amp and such. What are you trying to gain by adding the 4th sub?




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    Quote Originally Posted by Jroo View Post
    not quite sure what you are asking? Are you basically trying to add another sub on the inside of the car and keep the 3 in the trunk? I would focus on making the 3 in the trunk sound best before adding another sub with its own amp and such. What are you trying to gain by adding the 4th sub?
    the 3 in the trunk are already as good as they're gonna get, got no boot space left and I designed the custom box for them.
    and an extra sub would add more bass, figured that bit was self explanatory :p

    I'd like to know if all 4 subs need the same chamber size/tuning to sound good together.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    I think what you are trying to do will cause you more issues. You start getting into phase and delay issues by having a single woofer in car. They only time I have seen anything close to this is when someone has the subs playing different frequency. One example is and set of 8's under in cabin, on rear deck, or under the seat playing 100 to 50 and the subs in trunk playing 50 down. I sounds like you are just trying to stick another sub somewhere playing all the same as what is in the trunk.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    More than likely this will give you little or no gain for a big investment.

    If your goal is more output there has to be a better way to get there for less money.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    what kind of subs do you have and what size? and what amp is powering them. and what car are they in?



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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    No,no,no. You need each sub to be giving the amp the same impedance so they all receive the same power. The must all also be in the same sized box tuned to the same frequency. and don't mix and match amps for the same speakers.........



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    Quote Originally Posted by darron016 View Post
    I want to trade my amp but it is currently mounted to my trunk, how do I go about posting a picture with the date etc with it mounted? I can barely get to it

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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    This brings up an interesting question. Does it make sense to have several subs in different boxes tuned to different frequencies to get a fuller sound spectrum? From the comment above, if you do this, they would need to be run on separate amps.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    It doesn't work like that. If I was to have 4 subs I would want them all in the same box tuned to the same frequency with preferably one large port.



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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    It may be louder on certain frequencies, but will also cause a lot of cancellation at others. Will more than likely sound horrible.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    Quote Originally Posted by Lowflyin View Post
    No,no,no. You need each sub to be giving the amp the same impedance so they all receive the same power. The must all also be in the same sized box tuned to the same frequency. and don't mix and match amps for the same speakers.........
    The idea was to run it on a separate amp so differing impedance wouldn't be an issue, my concern was causing cancellation at certain frequencies if the subs responded differently as one would be in a different box to the others

    Quote Originally Posted by Vincer77 View Post
    This brings up an interesting question. Does it make sense to have several subs in different boxes tuned to different frequencies to get a fuller sound spectrum? From the comment above, if you do this, they would need to be run on separate amps.
    No, they will be covering the same frequencies and were going to be run on a different amp if the box was going to be another size, but at this point I believe I'm just going to go with the same size box/tuning freq to make sure all the subs respond the same. Then later on if I want I can run them all on the same amp.

    Quote Originally Posted by Better-Action View Post
    what kind of subs do you have and what size? and what amp is powering them. and what car are they in?
    old *** hatchback, 3 12" subs rated at 350WRMS, amp rated at 1500WRMS so it's capable of taking on 4 of them.
    I'm not going over that power because the cars electrical is being stretched to it's limits, recently had the alternator rebuilt/upgraded and I'm buying an AGM battery soon.

    Quote Originally Posted by Chriszle View Post
    It may be louder on certain frequencies, but will also cause a lot of cancellation at others. Will more than likely sound horrible.
    is that with the 4th sub in a different size chamber? or all the same?

    Cheers.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    What are the brands and models of the amp and subs?



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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    Quote Originally Posted by Better-Action View Post
    What are the brands and models of the amp and subs?
    does it make a difference? I'm just asking in general.


    on another note does the box have to be exactly the same shape? or just size and tuning are enough?
    as i understand it a different shape would only alter the phase a bit.




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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    Quote Originally Posted by RSDXzec View Post
    does it make a difference? I'm just asking in general.
    To be blunt, do not do it because it is a waste of time and you will not benefit from it.



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    Re: adding a 4th sub, do chamber specs need to match other 3 to sound good?

    Quote Originally Posted by RSDXzec View Post
    does it make a difference? I'm just asking in general.


    on another note does the box have to be exactly the same shape? or just size and tuning are enough?
    as i understand it a different shape would only alter the phase a bit.
    Yea it does kinda make a difference. If its poor quality equipment you could get much louder with fewer drivers. You could save space and be louder.... in general. But its your setup so yea, whatever you want.

    If the tuning and airspace is the same it should be OK. The only thing I can think of would be that because of the different enclosure you may get different box rise on that one. Which I don't know if it would be significant enough to matter, but I'm thinking probably not.

    Edit - I forgot it would be on a different amp. If your set on having 4 my recommendation would be to rebuild an enclosure for all 4, and get a amp that can power all 4. Seperate boxes and different amps and different boxes is not the way it should be done. 1 box, 1 amp and it should work out OK.



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