Sub louder with trunk open???

 

Bronze Member
Username: Proks

Post Number: 69
Registered: Aug-05
why does it seem louder when its open?
 

Silver Member
Username: Skies

Courtenay, British Colu... Canada

Post Number: 226
Registered: Aug-05
It is louder.

It has to do with physics...
Someone on here will give you the scientific explanation if you want it :P
 

Silver Member
Username: Stnorris

Eldridge, IA US

Post Number: 967
Registered: Apr-06
do u mean its louder inside the car with the trunk open?
 

Bronze Member
Username: Proks

Post Number: 71
Registered: Aug-05
ya, seems like its alot louder
 

Gold Member
Username: Tdbdadrummer

Wellsburg, WV USA

Post Number: 1608
Registered: Aug-05
Whoa...I saw my name and was like WHAT? But Tyler is right (that is odd saying that lol). It is as if the trunk or open windows create a secondary port, which adds the effects as if the car was the port.

It is physics though. The thing is, as far as what the open trunk or windows are tuned to, well it is unknown, so from the outside a certain frequency may prevail over others to an audience.
 

Bronze Member
Username: Proks

Post Number: 72
Registered: Aug-05
ok, i get that...but with my other deck... my sub was louder... with my 90 olds, trunk closed, my sub was louder then it is now trunk open and or closed... does that "magna bass" button on my old deck make that much of a difference... (and i had to shorten my box a bit)
 

Silver Member
Username: Stnorris

Eldridge, IA US

Post Number: 970
Registered: Apr-06
if your subs are pointing towards the back of your car, when you open your trunk it normally shouldnt be louder inside the car, because all the sound is escaping.

if your subs are pointing to inside the car, it would seem to make more sense
 

Bronze Member
Username: Proks

Post Number: 73
Registered: Aug-05
sub is pointing the same direction, i only switched decks, and it seems half as loud... im about rdy to kill myself:< lol
 

Silver Member
Username: Stnorris

Eldridge, IA US

Post Number: 972
Registered: Apr-06
what do u mean it is pointing the same direction?
 

Bronze Member
Username: Proks

Post Number: 74
Registered: Aug-05
ok, i switched cars, and switched decks... why is my sub so much quiter now, is it just that this deck is shittier???
 

Silver Member
Username: Stnorris

Eldridge, IA US

Post Number: 976
Registered: Apr-06
is has a lot to do with the vehicles. just cause the deck isnt as good, doesnt mean ur sub will be quieter. when u switched decks, you changed the gain didnt you?
 

Bronze Member
Username: Proks

Post Number: 75
Registered: Aug-05
iv been messing around to try and find the "right setting"... would cutting about 2inch of length off the box do somthign as well...??
 

Silver Member
Username: Troy81

Tavernier, Fl Us

Post Number: 780
Registered: Mar-06
what r u talking about, is your car bigger than your last one? the deck wont make ahuge differance in SPL, also cars have differant resonant frequencys so maybe your other car had a good frequency
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4062
Registered: Aug-05
the sub shouldn't seem louder with the trunk open, ESPECIALLY if it fires out of the trunk.

it WILL seem louder with the windows open and the trunk closed. b/c the sub in essense has more AIR to play in....thus...decreasing the air pressure in the trunk(if you have a fold-down seat)

maybe the newer HU has a diff. line Voltage?
 

Bronze Member
Username: Proks

Post Number: 76
Registered: Aug-05
in my car my seats fold down, and ya the interior is bigger to my knowladge, my sub is facing into the car, not out of... it just doesnt seam to be as boomy as before, i can hear a diffewrence.... do you know if camrys have shitty frequancies.... and would box size make a big difference?
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4064
Registered: Aug-05
if your sub is firing into the cabin....then your trunk lid acts just like an open window.:-)


depends on how much smaller you went on box size.
 

Silver Member
Username: Stnorris

Eldridge, IA US

Post Number: 981
Registered: Apr-06
thanks muddy thats what i was trying to say up there^^^^
 

Bronze Member
Username: Proks

Post Number: 81
Registered: Aug-05
oh ya... my clarion deck used a 15Amp Fuse, the sony uses only a .3 Amp... so that( head unit), the smaller box, and posibly the resinating frequency of the car all makes it quiter?

PS thanks for the help
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4073
Registered: Aug-05
like i said earlier...maybe the pre-out Voltage of your newer HU is diff.


try adjusting the gains on your amp.
 

Bronze Member
Username: Proks

Post Number: 83
Registered: Aug-05
whats the pre out voltage... im really sorry im "mentaly handicaped" when it comes to this, but we all gotta start somewhere
 

Gold Member
Username: Stnorris

Eldridge, IA US

Post Number: 1013
Registered: Apr-06
the pre out voltage is how much ur HU can put out to your amp of current. if your gain is set wrong with ur HU, i believe your subs will start getting the wrong kind of current (DC) and clip them. which can harm them a lot.
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4077
Registered: Aug-05
the pre-out Voltage is how much voltage your HU sends through the RCA's to the amp's RCA input.

you need to match the HU's pre-out voltage witht he gain on your amp.

otherwise...the amp will not have the right voltage to work with....thus underpowering your subs....or overpowering your subs by setting the gain too high....so it accomodates for a weaker signal(which isn't really weak, you just set it too low) and it will try to make more power than the amp is capable of.
thus clipping the top of the sine wave to the sub(making it a square wave...aka "clipped signal" and the amp sends it as DC instead of AC and the Voice coils burn up on your sub from not being able to dissipate the DC heat properly.:-)
 

Bronze Member
Username: Proks

Post Number: 84
Registered: Aug-05
where do i find out what the pre out volatge is... what spec sheet???
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4079
Registered: Aug-05
google it
 

Bronze Member
Username: Proks

Post Number: 86
Registered: Aug-05
# Preout Impedance -- 220 ohms
# Preout Voltage -- 2 Volts
# Frequency Response -- 10 - 20kHz

so i need to but my gain to 2hz? or what
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4081
Registered: Aug-05
i would do a little inder 2V....and don't turn the volume on the HU all the way up....the little MOSFETS inside the HU will clip the signal to the amp before the signal can even go through the amp to the sub.

set your HU's volume at about 3/4th of full and set the gains then...

best way is with a multimeter, but if oyu don't have one...then just tirn it up until oyu hear distortion and then tunr it down a little.:-)
 

Bronze Member
Username: Proks

Post Number: 89
Registered: Aug-05
on my amp, my gains are for bass but in the manual there in hz... im confused on how much to turn it up and whatnot
 

Gold Member
Username: Basshead86

Google is your Friend, FL

Post Number: 4083
Registered: Aug-05
you sure that is not your LPF or perhaps your subsonic filter....


all gains i have ever seen are in V. lol
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