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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?
- Thread Starter
- #3
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
I'd like to know if all 4 subs need the same chamber size/tuning to sound good together.
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.
hispls 5,000+ posts
CarAudio.com Veteran
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.
If your goal is more output there has to be a better way to get there for less money.
Better-Action 10+ year member
give me a reach around
what kind of subs do you have and what size? and what amp is powering them. and what car are they in?
Lowflyin 10+ year member
Sit on my face, B*tch
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.........
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.
Buck 5,000+ posts
little alien on campus
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.
- Thread Starter
- #11
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
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.
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.
is that with the 4th sub in a different size chamber? or all the same?
Cheers.
Better-Action 10+ year member
give me a reach around
What are the brands and models of the amp and subs?
- Thread Starter
- #13
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.
RicksI30 10+ year member
CarAudio.com Elite
To be blunt, do not do it because it is a waste of time and you will not benefit from it.
Better-Action 10+ year member
give me a reach around
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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