Gaining Decibels?

[NutHugger 10+ year member]

I'll agree that's a pretty impressive number for the jackhammer....but regardless of what woofers they are... he's got six 18s and 20kW+ of power, I'd expect a 159.

Cheesus Crust are you serious? Only a retard would think woofer + rated rms power at 1 ohm = magical number. No, you guys are idiots. What frequency is he tuned to? How is his box designed? What vehicle?

 

[NutHugger 10+ year member]

The internet heros JP and Meade had 4 18's and what like 18kw. Neither of them could even touch a 154. I think they BOTH did 153 at 42hz IN THE KICK with the door wide open. We need one of those willy wonka pictures for you retards that says "oh so you know about car audio? Tell me all about how cone size and amp power = deebeez". idiots.

Edit: Sorry I was wrong meade did 157 at the dash

and 158 in the kick.

 

[winkychevelle 10+ year member]

once u hit 155 its like hitting a brick wall gains are really hard to come by. you then need to get into coating resin on the box, moving the box, moving interior pieces, sitting on the truck, deadening and bracing it can get really hard.

and with that much power i bet power compression came into play where the coils heated up so much that their resistance got really high causing the amp to put out a very little bit

 

[wenn_du_weinst 10+ year member]

The internet heros JP and Meade had 4 18's and what like 18kw. Neither of them could even touch a 154. I think they BOTH did 153 at 42hz IN THE KICK with the door wide open. We need one of those willy wonka pictures for you retards that says "oh so you know about car audio? Tell me all about how cone size and amp power = deebeez". idiots.
Edit: Sorry I was wrong meade did 157 at the dash

neither of those guys could design a box if their life depended it. There are guys doing 155's in the 30hz region with 2 15's... If you can't do high 150's with 6 18's your an idiot.

 

[Full Tilt 10+ year member]

neither of those guys could design a box if their life depended it. There are guys doing 155's in the 30hz region with 2 15's... If you can't do high 150's with 6 18's you're an idiot.

Fixed..

Continue bickering.

 

[NutHugger 10+ year member]

neither of those guys could design a box if their life depended it. There are guys doing 155's in the 30hz region with 2 15's... If you can't do high 150's with 6 18's your an idiot.

You're not helping your case. More cone area does not = more spl. It just doesn't. It never has. Theoretically if you could apply infinite power to a woofer it would be ideal. Reducing cancellation is ultimately what SPL is about. NOT increasing cone area by way of adding more woofers. They introduce cancellation to each other. Next time you're at a show and someone has a wall you can get inside of, see if they will let you. Put your head in the center behind 2 or more woofers. however you can get in the center. Have them turn it up some. Notice the eery quiet of cancellation. Move a little and notice the crazy intense spl. that is because those woofers introduce cancellation to each other. We all know about the little tricks people can do to their interiors etc to gain BIG. How are those increasing rms power or cone area? I would bet you couldn't do high 50's if you have 6 18's. Why stop there. I bet you couldn't with 50 18's. See where this is going? By your logic if some is good more is better and it's clearly not.

 

[05trailblazer 10+ year member]

can i hitz 160+ with some crunch equipment??

 

[keep_hope_alive Premium Member]

In addition, you start encountering losses in pressure through factory seals, A/C vents, even mid/midbass cones will move. I can play 12 Hz with subs only and watch my midbass cones move a lot in response to the pressure. You can see/feel the body panels giving. Flex is pressure loss. There is a reason why high SPL cars have thick Lexan windows, bolted doors, concrete, etc.

Multi sub builds suffer phase interference. You want to ensure that destructive interference does not occur at your peak frequency, but constructive interference does. Note also that mic location changes what frequencies are constructive/destructive.

A proper understanding and application of physics goes a long way.

 

[chillin 10+ year member]

@wenn_du_weinst and @NutHugger

continue

opcorn:

 

[CHEMMINS 10+ year member]

You're not helping your case. More cone area does not = more spl. It just doesn't. It never has. Theoretically if you could apply infinite power to a woofer it would be ideal. Reducing cancellation is ultimately what SPL is about. NOT increasing cone area by way of adding more woofers. They introduce cancellation to each other. Next time you're at a show and someone has a wall you can get inside of, see if they will let you. Put your head in the center behind 2 or more woofers. however you can get in the center. Have them turn it up some. Notice the eery quiet of cancellation. Move a little and notice the crazy intense spl. that is because those woofers introduce cancellation to each other. We all know about the little tricks people can do to their interiors etc to gain BIG. How are those increasing rms power or cone area? I would bet you couldn't do high 50's if you have 6 18's. Why stop there. I bet you couldn't with 50 18's. See where this is going? By your logic if some is good more is better and it's clearly not.

If cone area didn't affect SPL, everyone would be running an 8" sub. Double the cone area, with all other things equal you should gain approximately 3 db. Give or take. Same as if you increase the given power by 2x.

 

[chillin 10+ year member]

If cone area didn't affect SPL, everyone would be running an 8" sub. Double the cone area, with all other things equal you should gain approximately 3 db. Give or take. Same as if you increase the given power by 2x.

This. In a perfect world, 3db increase, but in real world there will be cancellation, however that's where knowing how to design comes into play. If done right, there wont be much cancellation.

I would like to see everyone burping with 8 inch subs with 4 inch vc's though.

 

[NutHugger 10+ year member]

If cone area didn't affect SPL, everyone would be running an 8" sub. Double the cone area, with all other things equal you should gain approximately 3 db. Give or take. Same as if you increase the given power by 2x.

This is what I hate about people. Did I say that cone area COULD NOT affect spl? No, I said it does not automatically equal it. This is not me speaking out against cone area. This is me telling you it's not the end-all, be-all answer. I know it's hard for people to believe, but I'm not lying about it. Theoretically doubling cone area is +3db. There is no debating that. In reality it almost never happens. Same with doubling power. There will be forms of cancellation that mess that up for you, thus further proving my point. There are small woofers out there doing huge numbers. If cone area were required that would not be possible.

 

[stl_314 10+ year member]

Ive seen 6 type r 12's do 155's on music in a blazer before

 

[NutHugger 10+ year member]

Ive seen 6 type r 12's do 155's on music in a blazer before

Not calling bs, just hard for me to wrap my brain around.

 

[CHEMMINS 10+ year member]

This is what I hate about people. Did I say that cone area COULD NOT affect spl? No, I said it does not automatically equal it. This is not me speaking out against cone area. This is me telling you it's not the end-all, be-all answer. I know it's hard for people to believe, but I'm not lying about it. Theoretically doubling cone area is +3db. There is no debating that. In reality it almost never happens. Same with doubling power. There will be forms of cancellation that mess that up for you, thus further proving my point. There are small woofers out there doing huge numbers. If cone area were required that would not be possible.

Well did you not state "More cone area does not = more spl"? Given all other system components are equal, with just a change in size of woofer......you will gain..... it is simple physics.