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bigbassboi
03-27-2006, 08:04 PM
does tuning a box to higher hz, give u aliitle higher db...

example 1 type r 15" if tuned to 35 hz as opposed to 32 will give a jump in db

bigbassboi
03-27-2006, 08:04 PM
just what i read a few moments ago

JL12W7INAGS300
03-27-2006, 08:07 PM
Wtf Mate

bigbassboi
03-27-2006, 08:08 PM
lol

BigSquid10
03-27-2006, 08:09 PM
i was wondering the same my box is tuned at roughly 38 Hz. i dont know much about ported boxes so how would i tune my amp to the 38 hz??

bigbassboi
03-27-2006, 10:06 PM
not amp tuning, port tuning, by the way mate, i am asking the question, not looking for some ******* respoinse like what the ****, help us out

kuijo
03-27-2006, 10:08 PM
The higher its tuned more output it will have, but it won't hit notes as low.

If you want to win some competitions tune it to the vehicles resonant frequency.

bigbassboi
03-27-2006, 10:13 PM
how do u find vehicle resonant frequency,,, are they're simple ways of doing so, or do u need to get in metered....

Decipha
03-27-2006, 10:27 PM
go with a single sub sealed and meter it through out each frequency, which ever gives you the loudest is the winner

bigbassboi
03-27-2006, 10:29 PM
sweet thanks man, so biulding a box tuned at that particluat hz, is the best suited for the vehicle type

kuijo
03-27-2006, 10:33 PM
sweet thanks man, so biulding a box tuned at that particluat hz, is the best suited for the vehicle type

If you're competing and don't care your subs sound like ****.


If you're doing a daily driver, i wouldn't go anywhere outside of 28 min-40max. A vehicles frequency can be around 60-80hz

amartin_72
03-27-2006, 10:47 PM
Only tune higher if your actually going to enter a competition and be in a league or go to alot of events. Tuning lower will "sound" like its louder but might hit 1 less max db at the higher hz.

bigbassboi
03-28-2006, 06:49 PM
so what would u recommend for a single 15 " type R sub, box size and tuning....

for my friends truck?

Trixter
03-28-2006, 07:05 PM
big box and a lot of port area....for my 15 i go with 4.5cu' with 60sq" of port. however i tune to 38hz, it does best in my car...kinda wierd...lmk if you want the plans, but you need to give me your tuning freq.

to find my tuning freq., what i did was use an old mtx 10" in a sealed box. played tones from 30-100hz inside the car and then again outside the car...making note of each tone. the tone with the biggest inside/outside difference is your winner. it also helped that i had a term-lab at the time.

photocrazy8
03-28-2006, 07:13 PM
ok so it has been established that more box space and higher tuning Hz gives more SPL. And tuning Hz is determined by the port length. So where does port size in terms of sq" come into play?

bigbassboi
03-28-2006, 07:15 PM
yes i would like to know

photocrazy8
03-28-2006, 09:05 PM
any one?

matt_martin87
03-29-2006, 11:45 PM
So where does port size in terms of sq" come into play?

Explain

Trixter
03-30-2006, 12:22 PM
not to make anyone sound like an idiot, but i'm going to dumb this down for everyone...

the sq" of the port is simply the area of the opening
-for a slot/square port it is the height x the width
-for round ports it is radius squared x PI (3.14)

the sq" is important because too little and you will get wind toubulance which can cause distortion. too much port area (depending on the box) can cause the sub to reach over excursion (like being in free air).

for round ports i use...
6"-8" driver - 3" wide port
8"-10" driver - 4" wide port
10"-12" driver - 5" wide port
12"-15" driver - 6" wide port

these numbers can be used to figure out slot ports as well...
example: pair of 12's: (2.5 x 2.5) X 3.14 = 19.6 (we'll just round to 20) then 20 x 2 = 40sq" of port.

now, depending on the box volume and desired tuning freq., will determine the port length.

the larger the port area, the longer it will need to be to achive a given freq., the less port area, the shorter it needs to be. you could, in theory, have a small box and tune it really low (16hz or what ever) with only using a 2" round port that would only have to be 8" long. but because of the tourbulance, it will be distorted and possibly even whistle. so, the right combination of port area, box volume, and desired freq. will determine the port length.

if i confused anyone even more...oh well, you asked.

truckstoy
03-30-2006, 04:12 PM
not to make anyone sound like an idiot, but i'm going to dumb this down for everyone...

the sq" of the port is simply the area of the opening
-for a slot/square port it is the height x the width
-for round ports it is radius squared x PI (3.14)

the sq" is important because too little and you will get wind toubulance which can cause distortion. too much port area (depending on the box) can cause the sub to reach over excursion (like being in free air).

for round ports i use...
6"-8" driver - 3" wide port
8"-10" driver - 4" wide port
10"-12" driver - 5" wide port
12"-15" driver - 6" wide port

these numbers can be used to figure out slot ports as well...
example: pair of 12's: (2.5 x 2.5) X 3.14 = 19.6 (we'll just round to 20) then 20 x 2 = 40sq" of port.

now, depending on the box volume and desired tuning freq., will determine the port length.

the larger the port area, the longer it will need to be to achive a given freq., the less port area, the shorter it needs to be. you could, in theory, have a small box and tune it really low (16hz or what ever) with only using a 2" round port that would only have to be 8" long. but because of the tourbulance, it will be distorted and possibly even whistle. so, the right combination of port area, box volume, and desired freq. will determine the port length.

if i confused anyone even more...oh well, you asked.


very well said ;)

matt_martin87
03-31-2006, 12:09 PM
Now I understand. sq"=Square inches. I was confused by the way it was written.

bholtmeier
03-31-2006, 12:15 PM
martin, what r u doing on here during schoo?

matt_martin87
03-31-2006, 12:18 PM
Whoa holt. I could ask you the same question. We're in school, there's no time for car audio here.

lionel2
03-31-2006, 05:00 PM
I have my subs tuned to 27hz it hits hard and low..just doing what is recommended by JL