what box for 4 10w7s+1 13w7?

[cotjones 10+ year member]

Did you google that?

Yes why?

 

[cotjones 10+ year member]

Audioholic, you are also forgetting another fact:

the more soundwaves you have, the less net interference.

That is, beyond the closest area to the subs, there's a name for it but i'll have to look it up

 

[cotjones 10+ year member]

Fresnel zone:fyi:

 

[audioholic 5,000+ posts]

ok nvm it was too time consuming just look at this

now imagine that signal reverberated hundreds of times because of the environment of the car being so small and it would be very hard to find big areas of interference. In larger rooms and home theater systems, this problem is more prevelant because of the increased distance the waves travel and reverberate and decay. this also means that interference is more prevelent at lower volumes ie: less and less powerful reverberation.

Again, if what you suggest were true, changing the direction you fire your subs would make no audible difference. And yet it does...

 

[Gearstix 10+ year member]

A kid in my class (yes I'm in highschool)

said he wants two 10s, two 12s, two 15s and a 18...

10 for the kick, 12 for the punch, 15 for the boom and 18 for the slap he said...

I just laughed.

I knew mixing sub sizes wasn't a great idea.. after reading all this I kinda think I understand why..

If you mix sizes, the different subs will cancel each other out, making it seem like there is less subs there?

I'm not sure if I'm understanding this..

 

[Gearstix 10+ year member]

srry double post

 

[cotjones 10+ year member]

Again, if what you suggest were true, changing the direction you fire your subs would make no audible difference. And yet it does...

like i said, I HIGHLY doubt the difference i was experiencing was due to acoustic interference, it was just way too big of a difference, i'm talking about like "something is fvck up with my system" difference. It was probably due to the polarity like i said. and the reason it sounded better when i inverted it was more likely because the airspace for the 13 was too small... and that would also explain why it sounded even better after i added the extension.

 

[cotjones 10+ year member]

A kid in my class (yes I'm in highschool)said he wants two 10s, two 12s, two 15s and a 18...

10 for the kick, 12 for the punch, 15 for the boom and 18 for the slap he said...

I just laughed.

I knew mixing sub sizes wasn't a great idea.. after reading all this I kinda think I understand why..

If you mix sizes, the different subs will cancel each other out, making it seem like there is less subs there?

I'm not sure if I'm understanding this..

no you are not, however the above proposed setup is over-doing it a bit, and pointless for the goals he is stating

 

[audioholic 5,000+ posts]

like i said, I HIGHLY doubt the difference i was experiencing was due to acoustic interference, it was just way too big of a difference, i'm talking about like "something is fvck up with my system" difference. It was probably due to the polarity like i said. and the reason it sounded better when i inverted it was more likely because the airspace for the 13 was too small... and that would also explain why it sounded even better after i added the extension.

That may be, but that still doesn't explain away the issues caused by multiple sized drivers running the same frequency band.
Ive given reasons why such a setup would yield notoriously poor results. Can you give a logical reason as to why someone, who understands what they are doing, would even attempt/require/want multiple sized subwoofers for their subbass? Is it so hard for you to say 'wow I was being a dumb ***, glad Ive learned since then'...? Instead you have to come up with every jack *** reason you can think of why you couldn't possibly have built a truly laughable sub stage. You have 20 highschool friends that tell you that you had no interference. Well you've had alot more people than that here on this board, enthusiasts to fanatics, who have told you that no matter if you thought it sounded 'good', or all your homeboys thought it sounded 'better' than someone else's, the system design had elementary flaws that to the knowledgeable observer would clearly indicate the designer/builder had some fundamental errors in his acoustical theories.

As for acoustic interference and its impact, it can make drastic changes if you want to discuss localization. Borrow someone's SPL meter, move the mic around in your cabin, and then come tell us why CGt didn't apply and 'fill in the gaps'.

You have referred to electronic cancellation more than once now. How are you suggesting this affected your stereo system?

 

[cotjones 10+ year member]

That may be, but that still doesn't explain away the issues caused by multiple sized drivers running the same frequency band.
Ive given reasons why such a setup would yield notoriously poor results. Can you give a logical reason as to why someone, who understands what they are doing, would even attempt/require/want multiple sized subwoofers for their subbass? Is it so hard for you to say 'wow I was being a dumb ***, glad Ive learned since then'...? Instead you have to come up with every jack *** reason you can think of why you couldn't possibly have built a truly laughable sub stage. You have 20 highschool friends that tell you that you had no interference. Well you've had alot more people than that here on this board, enthusiasts to fanatics, who have told you that no matter if you thought it sounded 'good', or all your homeboys thought it sounded 'better' than someone else's, the system design had elementary flaws that to the knowledgeable observer would clearly indicate the designer/builder had some fundamental errors in his acoustical theories.

As for acoustic interference and its impact, it can make drastic changes if you want to discuss localization. Borrow someone's SPL meter, move the mic around in your cabin, and then come tell us why CGt didn't apply and 'fill in the gaps'.

You have referred to electronic cancellation more than once now. How are you suggesting this affected your stereo system?

no no i'll admit that, it was a dumb setup choice I made out of ignorance...but it did NOT sound bad or have significant cancellation problems... i mean seriously, even epoxy could not hold my rear-view mirrior on, my dask cracked from flex(also probly weakend from age and sun, but def. cracked during music, and the brackets on the back window broke and shattered my back window. (and before you go //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif the back window is connected very poorly with basically 2 bolts.)

 

[cotjones 10+ year member]

That may be, but that still doesn't explain away the issues caused by multiple sized drivers running the same frequency band.

and something else, i'm still not seeing a bassis for why Multi sup setups have more interference than same sub setups?

 

[cotjones 10+ year member]

unless you are going to argue that different size subs play different frequencies,

the difference in the sound waves is in amplitude and possibly THD of the individual drivers, which should be fairly inaudible anyway.

That being said the over-all potential for interference is less in waves

with different amplitudes than in those with the same.

This is due to the fact that when the amplitude of 2 waves are the same,

Complete cancellation is possible at all points in a cycle of the waves.

But in waves of different amplitudes, complete cancellation is only possible

at 2 exact points of differencial in the 2 waves in a single cycle.

at all other points, interference is attenuated compared to waves of the same amplitude.

 

[KHARPS 10+ year member]

why??????

 

[KHARPS 10+ year member]

yep

 

[KHARPS 10+ year member]

kl