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SPL Gains!! Updates @page 30 (routing the port)


636 replies to this topic

#1
fecupe2001

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Results so far!!

Gain:
- Moving box around the trunk until i found the sweet spot: 0.5 dbs
- Changing box size until i found the best one: 2.2 dbs
- Removing sub´s boot: 0.1 dbs
- Negative wire run from battery to amp instead of grounding it to the car: 0.3 dbs
- 2 extra batteries: 0.2 dbs (depend on the application, i was using SMALL power).
- Printing Vinyl inside the box to make it smooth: 0.4 dbs
- PVC round over on the pressure point of the box: 0.2 dbs
- Extertnal flare on an aeroport: 0.9 dbs
- Internal flare on an aeroport: 0.7 dbs
- Duct taped old screws holes on the box: 0.3 dbs
- Sunvisors folded down: 0.5 dbs
- Moving front seats all the way forward: 0.7 dbs
- Taking out floor mats: 0.1 dbs
- Front seats vertically: 0.3 dbs
- Center console empty and open: 0.2 dbs
- Covering the sub´s pole vent hole: 0.14 dbs
- Duct tape around the sub: 0.25 dbs
- Using 8 gauge from sub to amp instead of a POS wire: 0.22 dbs
- Cooling the cabin with the a/a: 0.45 dbs
- Rounding the sub hole: 0.28 dbs
- Rounding the external edges of the box: 0.17 dbs
- Armor all the whole interior of the car: 0.06 dbs

- OFC vs CCA vs Welding vs electrical wires: 0.1 - 0.2 dbs difference only!!

- Grounding battery to chassis : 0.3 dbs

- Routing the mouth of the port : 0.15 dbs (only 1/2" , should be higher with a bigger jig")

Lost
- Raising tuning: 0.3 dbs, this depends entirely on the car!!
- Installing 45´s on non pressure points of the box: 0.4 dbs
- Steering wheel at lowest position: 0.2 dbs
- Having 2 round ports with different sizes: 0.5 dbs
- Printing vinyl outside the box: 0.3 dbs
- PVC roundover outside the box: 0.2 dbs
- Opening the glove box: 0.2 dbs
- Closing a/a vents: 0.5 dbs
- Inverting the sub´s polarity: 0.3 dbs
- Changing from PVC roundover to mdf 45´s : 0.2 dbs

Hey guys, just wanted to post a couple of things i tried this week, i had some 3/4" MDF in my garage and said, what the heck! I built a sealed box to show people how you can find the resonant frequency of a car:



After that, i started some nice trials and mostly errors haha, but here are some tips, advices, gains, scoring drops, etc etc , i started taking pictures but i got bored of taking them, this is my 99 Ford Explorer wich is a "big" SUV and i tried a very SMALL cone area for it, testing was at the beggining with one of my 2512´s but sub barely moved because of the small power i was using and the tiny little box, so i changed to a crossfire BMF 375 watts sub, i was using an Almani 1500 watts amplifier wich i don´think it´s even a 1000 watts amplifier, but who cares,once again, this topic is not meant for braking any world record, i don´t care if the number sucks, this topic is only to show you guys a few tips on how you can gain some debeezzzz!!!!

Said all that, let´s start with the box, i did it this way because i wanted to try 3 different box sizes with this thing, see how much i could raise or drop by getting it bigger, also ,remember that raising or shrinking the internal space changes the tuning frequency, so yes i had to retune this box each time i changed the internal space, i had A LOT of 4" pvc pipe in my garage so i didn´t care, this is the box:

Sealed box , 1.1 cubic feet after sub displacement:
1006142.jpg

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Score with the sealed box:

sellada.png

After this, i drilled a hole for a single 4" PVC tube and got this box ported with an external port, this means that the box remained 1.1 cubic feet after sub displacement, i tuned this box to 42 hz

1006164.jpg

New score:
1354vl.png

After this, i tried box positioning, and found out that this box scored WAY BETTER by facing the sub to the driver side and the port to the back!!
New score:
1359p.png


This score was at 55 hz, so i knew box was way to small and i needed to raise the internal space, to be able to do it, i didn´t glue the box so i could open the box a few times without any problems, anyways, i raised the internal space from 1.1 cubic feet to 1.3 cubic feet.
1006169.jpg

New score at 53 hz:
137o.png


Edited by fecupe2001, 08 August 2013 - 12:26 PM.

I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion!

 

2 15" subs and a 2K wired at 1 ohm,  http://www.stevemead...ideo-on-page-3/

 

8 Massive 15" subs and small power, http://www.stevemead...-bandpass-wall/


#2
fecupe2001

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I always wanted to try taking out the boot of the sub, i saw a guy saying it raised his score 0.2 dbs , of course i wasnīt gonna pass the oportunity of trying this:

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Next step was getting the box bigger, i raised the internal space from 1.3 cubic feet to 1.5 cubic feet with an external 4" PVC tube 12" long, this gave me around 39 hz, what i learned about this truck is that, no matter what you do, the thing likes to peak between 52 and 53 hz no matter where i tuned the box, of course the box was small so it was one of the reasons, here we go:

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New score:

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After this, i retuned my port from 39 hz to 42 hz trying to raise the tuning up for a better score, i was amazed of the result, honestly i thought i would raise a few tenths but i dropped to this:

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So, i cut another piece of PVC and retuned to 39 hz again and my score got to 137.7 dbs again!!

The pictures about the scores END here, i honestly got bored of taking them, if you believe the scores nice, if not, then donīt bother to read the topic anymore :drinks:

Anyways, i changed the DD 2512 because the box was to small for it and the power was stupid small, so i installed a Crossfire BMF 12" wich is 375 watts, i raised 0.3 dbs by doing this, so, i went from 137.7 dbs to 138.0 dbs @ 53 hz.

I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion!

 

2 15" subs and a 2K wired at 1 ohm,  http://www.stevemead...ideo-on-page-3/

 

8 Massive 15" subs and small power, http://www.stevemead...-bandpass-wall/


#3
fecupe2001

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There are TONS of people on this forum wondering how much you can gain by running a negative wire from the front battery to the amplifier instead of grounding it to the car, so , i disconnected the ground from the amplifier to the car and connected one of my negative runs that comes from the front battery to see how much a single negative run add to this application, went from 138.0 dbs to 138.3 dbs!!

Then, i connected my 2 batteries on the back and the other pos and neg runs, so i went from a single batt with 1 pos and 1 neg to 3 batts with 2 pos and 2 neg, my score raised from 138.3 dbs to 138.5 dbs!!

So this means, that the 2 batts on the back were giving me 0.2 dbs on this application, if you are wondering why i got a small gain about having 3 batts instead of a single batt, itīs because this amplifier is so small that it doesnīt need too much power, In other words, going from a single battery without a negative run to the back , to 3 batts and 2 + and 2 - gives me 0.5 dbs on this application!!

Ok, iīve ALWAYS wanted to try something different than the resin because itīs a pain in the ass to work with , and besides that, itīs expensive!!! Said that, we all know that the most of the time, you gain some by getting the surface of the box smooth as hell, since i have a printing supplies company, i took one my my PRINTING VINYLS and installed this thing inside of the box, if you guys wanna try this itīs way cheaper than the resin, also, i didnīt pay too much attention on details and ended up with a few scratches:

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Looking thru the port:
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New Score: :pardon:

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As you can see, the dumb ideas sometimes WORK!! there arenīt bad or stupid ideas on SPL, you have to try everything that comes across your mind, you never know whatīs gonna happen!!

I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion!

 

2 15" subs and a 2K wired at 1 ohm,  http://www.stevemead...ideo-on-page-3/

 

8 Massive 15" subs and small power, http://www.stevemead...-bandpass-wall/


#4
Rebel4055

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Taking the boot of the sub was pretty interesting.. And finally someone confirmed the ground haha!

[color=rgb(255,255,0);]Rest In Peace mother.[/color]

 

[color=rgb(255,255,0);]January 22, 1955 - February 14, 2013[/color]

 

http://www.stevemead...r/35351-megrch/


#5
StrongmanDesigns

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This is awesome man keep it going. I've been trying to find time to do testing like this myself.

#6
fecupe2001

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So far so good, we went from 134.6 dbs to 138.9 dbs on a single afternoon!!!

Anyways, it was time to move on to the 45īs , since i had A LOT of pvc, i prefered to try rounding the corners instead of building some wood 45īs , after this test i learned something IMPORTANT, this are the most crucial and dangerous things you can install inside of a box!!!!!!!!!!!!!!!!!

How come?? oh well, here are the pics:
I striped a 4" pvc tube on 4 pieces, first i installed some vertical round overs:
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Guess what??? i went from 138.9 dbs to 138.6 dbs by installing those things =@

After the 0.3 dbs lost, i took them out to confirm my last score and got a 138.9 dbs again!!

So, the next step, was to install a single horizontal round over!!

Posted Image

New Score: 139.1 dbs

Then, i installed a second horizontal round over close to the port:
Posted Image

This one dropped my score to 138.7 , took it out and got to 139.1 dbs once again.

I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion!

 

2 15" subs and a 2K wired at 1 ohm,  http://www.stevemead...ideo-on-page-3/

 

8 Massive 15" subs and small power, http://www.stevemead...-bandpass-wall/


#7
fecupe2001

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Taking the boot of the sub was pretty interesting.. And finally someone confirmed the ground haha!


Yeah man, that helped a lot hehe, well, glad i could confirm something, tons of new updates in a few minutes!


This is awesome man keep it going. I've been trying to find time to do testing like this myself.



Thanks a lot hommie, yes sir thereīs more coming up!!

I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion!

 

2 15" subs and a 2K wired at 1 ohm,  http://www.stevemead...ideo-on-page-3/

 

8 Massive 15" subs and small power, http://www.stevemead...-bandpass-wall/


#8
fecupe2001

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I have to go now, iīll update this topic tonight :popcorn:

I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion!

 

2 15" subs and a 2K wired at 1 ohm,  http://www.stevemead...ideo-on-page-3/

 

8 Massive 15" subs and small power, http://www.stevemead...-bandpass-wall/


#9
cracker

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i like this thread already :drinks:
March 2010 SOTM winner :)
my old buildhttp://www.stevemeadedesigns.com/board/topic/50219-dank-aka-crackers-bonne-new-v2-build-in-the-works-hahahaaaaaa/page__hl__crackers
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i need tacos and bass to live!!!!! and will NEVER change hahaaaa


TEAM NOIZE VIOLATION

#10
Tebo

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great post!

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excessive amperage 300 amp alt with MONSTER stud =) sundown z v3 15 in a 4th order on aq2200 sundown 100.4 2 way active... 2 Prv audio 6mb200 & 2 re XXX tweeters deka intimidator kenwood x396 big 3 1/0 knu wire back to deka intimidator


#11
Ford302Redneck

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I tested my Honda Accord one day, and I gained 2dBs just by moving seats, visors, and other stuff in the car. ;)

Ductape around the sub usually gains .1 or so. There is soooo many little things to do to gain. If you start at 145 with a plain install, a 148-9 is easily reachable in most cases. Just by doing little stuff.

I love doing tricks like this to gain SPL. I hope to buy a TL this spring just to test and have something to do.

I have a lot I want to myths I want to test, and a lot of things people say makes a difference I just don't believe.

#12
Forevrbumpn

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now try the carpeted box trick, how it lowers by like 0.3db+ :good:
Posted Image

I have a ritual called "terminator". I crouch in the shower in the "naked terminator" pose. With eyes closed I crouch for a minute and visualize either Arnie or the guy from the 2nd movie. I then start to hum the T2 theme. Slowly I rise to a standing position and open my eyes. It helps me get through my day. The only problem is if the shower curtain sticks to my terminator leg. It sorta ruins the fantasy.




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