Just wonder what will be effected by this?

eg.sound quality goes bad or improved or it will damage the Woofer it'self ....just heard a friend said with reverse polarity the woofer produce a "harder sound that pound ur heart wor ....dunno it's true or not

0' mean in-phase, 180' mean out-phase.

please view the pictures as below :


let's say this is in-phase sound wave


let's say this is out-phase sound wave



when in-phase sound wave mix with out-phase sound wave, it will be cancellations with others (look at the red line sound wave)


trust ur ear, it can give you the correct feeling, when the sound wave don't have cancelations, you will feel more bass into ur car, mid bass and sub bass with come together in once times, and the sub bass will come from front, not rear.
If the sound wave cancellations, u will feel the bass is less pressure / dB, and the mid bass never combine with sub bass together.
Don't affraid to try adjust it few more times, 0' or 180'。。。。。。just try it and listen it

no damage, just try both ways, see which one sounds better to you...

some do it to get upfront bass, but sub is sometimes softer

some prefer harder bass, but then sub sound comes from the back

so is also important to have strong midbass to help the sub bass

what is more important is that ALL speakers should be RELATIVE in phase with each other.. by flipping the phase of the sub sometimes can cause cancellation with other speakers resulting in one sided bias, muffled ec

I tried both setting already....when the Polarity has been reversed,from close listening the woofer sound harder but when u sit at the driver sit there,the Woofer sound softer ~

I also confused which setting should i use

the one that sound better when you sit on your driver seat.... not in front of the woofer..

Means i have to put back the the correct polarity then

Have to video to share with u guys :
http://www.youtube.com/watch?v=cedfX-gzHuM

I had not seen a car with that kind of crazy loud audio system before ~ Awesome

This post has been edited by Wilson13B: Mar 20 2011, 12:07 AM

usually you will have some cancellation if u just put 180degree off phase....there's seldom of car will suit perfect with that. Only sometimes it may sound better. Now since u had tried, just use the 1 you like.

no any formula teach u how to tune, just trust ur ear, dun affraid to try more and more times

me just trust the correct polarity...then why maker make it polaritized?

True also, then why they make + and - ??

have to make it suit to your car first maa, that one more important... not putting in living room like home audio

Well..If you connect ur Woofer with Reverse polarity..this would happen

when the Membrane of woofer was supposed to move Forward..it will move backwards instead..

so if it was to punch sound forward..it will punch sound backward..
i think it wont damage..BUT if u play LOW bass with Loud sound..
Membrane will move backward with a LOT of force and hit the backwall instead of moving forwards..(depends on the design)

dont reverse polarity..theres a reason they marked it +ve and -ve

that is really some absurd explanation

That's like an over incursion as opposed to an over excursion. If you play louder than the sub is built to do, whatever polarity you put will kill your sub. Sounds like your installer made up some excuse why your sub died once upon a time.

its actually true, but it doesnt hurt the sub. ive been playing with polarity for years, even with mids & tweets also, and my sifu somore maybe 30 years already doing this..

when we put the sub in a box, the sound comes from the whole box, not just the sub cone. so 2 ways of connecting, 2 ways the cone will move will give 2 types of sound, so we pick which sounds better lah..

last time got no time alignment, so we played with polarity, can get some delay a bit... even with time correction is also consider playing with polarity but in a different way, thats why lot of SQ ppl dont like time correction..

hmm, so many reputable sifus here voiced out their input, so which is correct anyways? perhaps everyone is saying the same thing, just some minor misunderstanding here and there?

er...

there is no right or wrong in this issue... and i see no argument point between which polarity... its like arguing about the crossover points... there is no right or wrong... whatever sounds best, thats where it should be...

and its marked + and - is not because its supposed to be connected that way... its just as an indicator, if there is no markings, then the people with multiple sub will have a hard time making every sub in the same polarity...

and well... either ways, it wont damage the sub.. unless of course, on a DVC, both coil are not in the same polarity... that scenario, well... the sub wont "dance" also...

second that, the sub really does punch backwards due to the reverse flow of current. just that usually home hifi, we dont reverse the polarity as there is no need to do so, so maybe people tend to think reversing them is a wrong way of connecting. but as for vehicle, thers no choice since most of the time sub is located at the back. you will want to reverse it so that you dont felt huge pressure level from behind.

its like front component will do the beating, behind absorbing em but still produces the low humm that you need. only applicable if you're into sq i guess.

This post has been edited by ssd87: May 5 2011, 09:54 AM

Hmm yeah maybe

Here's a more Professional Explanation

Audio Signals are not DC, They are Alternating Signals with continuously varying Frequencies,
an Audio Track playing a constant 20Hz tone will make the Polarity of the wire change 20 Times in a second
From this you might say that its okay to connect a woofer in reverse Polarity, since its changing polarity 20 times every second, But ofcourse that is only for the 20Hz tone, and we dont call it music

during a normal song, the frequencies are constantly changing,

so it all boils down to one thing, changing polarity means when the woofer membrane was to move forward, it will move backwards

keep in mind that some woofers are designed to move more in forward direction than backwards,
moving forward is okay, but if you move backwards the coil will hit the magnet wall and create a rattling sound and damage ur Woofer

okay, so WHAT if the woofers are not marked?
then you can do a simple test
take a 1.5V AA Battery, connect its +'ve terminal to one of the terminal of Woofer
connect its -'ve terminal to the other terminal of woofer


if the membrane pushes forward, that means you connected +ve of the battery to the +ve of woofer,
if it moves backwards, it means you connected +ve of battery to the -ve of the woofer

then you can mark its terminals

---

Added on October 5, 2011, 10:47 amNo, Markings are there because its supposed to be connected that way
because normally audio signals from songs tend to push woofer more towards forward
(peak amplitudes are on the +ve)

ofcourse you can connect tiny speakers anyway you want, cuz they dont move (or flex) much
but we're talking about huge woofers, and we are supplying a lot of juice (amps)

you can connect woofers oppositely if you dont listen too loud..that wont damage them

---

Added on October 5, 2011, 10:59 amI install my woofers myself, cuz i know how to handle the juice properly
i just explained what would happen if you put a sub on reverse polarity, not recommended doing it
ofcourse both ways you can kill your sub with overPower..

This post has been edited by amir_zohaib: Oct 5 2011, 10:59 AM