splx1 Posted August 26, 2015 Report Share Posted August 26, 2015 hi to all. i want to join in a spl competition. i wanna make a wall box,but in some cars that were in competition i saw the console in the cars,what does a console do in this kind of box? look at the pictures plz: thanks... Link to comment Share on other sites More sharing options...
Inetba Posted August 28, 2015 Report Share Posted August 28, 2015 It's to reflect sound waves and direct sound waves. Link to comment Share on other sites More sharing options...
splx1 Posted August 29, 2015 Author Report Share Posted August 29, 2015 tnx inetba,what does that mean why do we need to reflect and direct the sound waves? direct to the sensor of a db meter? does it have a special measurments? Link to comment Share on other sites More sharing options...
Inetba Posted August 29, 2015 Report Share Posted August 29, 2015 This is going to be a little long winded, but bear with me. If you look up the world record for the loudest scream, it's 129 decibels. So the loudest person in the world is 129 decibels. The 2nd loudest was 116 decibels. Yet arrowhead stadium holds the record for loudest crowd cheer at 137.5 decibels. How? Sound waves make an S shape or a W shape. When sound waves overlap perfectly, they greatly increase in intensity. However if two sound waves are OUT of sync, they cancel each other out, LOWERING the intensity. A sound waves comes out from the port, and a sound wave comes out from the woofer itself. If you can get those sound waves to match up, you can get a HUGE gain in output. Now sound waves travel in ALL directions like a ripple in a pond. Imagine if you could get alllll those ripples to meet up at the same exact spot at the same time. If you could get the waves traveling sideways to bounce and meet the waves traveling forward. You could gain 3,6,9, or even twelve decibels without increasing wattage. That's how people are able to hit 180 decibels with ONE 18" subwoofer. By getting all the sound waves to converge at one spot at the same time. But it'll only work with one frequency. Any other frequency wouldn't meet up at the same time since they're shorter or longer in length. A decibel (dB) meter measures sound pressure levels (SPL). When you hear about people wanting to maximize their dB, they're basically talking about maximizing how much force the sound waves push against an object. Once you get above 180 decibels, the force is actually close to a grenade exploding! It would kill you very quickly, even with hearing protection! That's why if a vehicle is capable of over 140 decibels, you're required to be able to use the radio from outside the car. Over 140 dB causes INSTANT hearing damage. Now it won't blow your ear drums immediately, but you will lose the ability to hear higher frequencies much faster as you get older. Anyways now I'm rambling. You get the point. Link to comment Share on other sites More sharing options...
Kyblack76 Posted August 29, 2015 Report Share Posted August 29, 2015 It also is taking up in cab space. Id venture to say, there is a limit to how tall, wide, thick it can be, but i dont know. SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
Leo1103 Posted August 29, 2015 Report Share Posted August 29, 2015 Acts as another port/loading wall. It's there to help direct pressure to tje eters location. 2002 Honda CR-VAlpine 9887My BuildRebuilding... Second Skin Damp 4 DC XL 15's 2 DC 5ks Singer 320 amp 6 cap banksSky High wire 2 VM-1's OM-1 all under window line Team DC Audio Obama has a law he's trying to pass right now, trying to ban Leo for being a threat to children everywhere.EDIT: Not in a JP kind of way. I thought I was going to die from all the jizz filling my ears. Link to comment Share on other sites More sharing options...
splx1 Posted August 30, 2015 Author Report Share Posted August 30, 2015 first of all i just want to thank you about your helps,now i exactly know why they use console,they want to direct the waves to the db meter. in this case i have some questions: if we use more subs like 2or 3 or 4 or more...what will happen?with one subwoofer its easy to direct cuz the sub is below if the console like the picture of solo x,but in the other ones they use 2subs,doesnt it make wave cancelation? can we make console taller? i think craige butler or scott owen,for this cancelations use 4 order bandpass boxes,the rear chamber is sealed and the waves of back of the woofers didnt gather with the waves of cones of woofers and they got this records just with the front waves,didnt they? but we still have the wave cancelation or not?why the records with one subwoofer vs many woofers have diffrence about 1.9 db.... Link to comment Share on other sites More sharing options...
Rip Rock Posted October 24, 2015 Report Share Posted October 24, 2015 My 2 db's on this. Back in the day, a centre council was used to take volume up , help with velocity and also to guide the waves. Stick mics like velocity . But now with the switch to pressure sensors, with a bandpass, it's used for tuning the pass side, and also to keep the pressure over were the sensor is. There is 3 main box's in an extreme vehicle, and 2 main ports, not including the sub boxes . Think about it for a second, how do you tune a regular box? Port area, port depth and box volume. It's the same in extreme, just more of and more complex. Mike and Mark [email protected] Link to comment Share on other sites More sharing options...
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