hey all i am a bit of a noob wen it comes to sound systems.anyway what i want to no is
can i turn my subs around so they are facing out like in picy.If so are there any advantages/disadvantages.I prefer the look of it reversed but if it is going to affect them
then i will turn them back.Also i have seen some sub enclosures with holes in the rear of them is this for better sound quality?
Thanx for your help
Darren

http://img.photobucket.com/albums/v622/moparcm6/DSCF2716.jpg

Inverting your sub will not really give any sound improvement, at least in my experience (have recently done so, last week) All it does is give you a little more volume of your subwoofer box to play around with, so instead of the magnet, coil and the rest of the sub being in the box taking up room, it sits inverted, giving a little more volume (thanks to the cone facing the opposite way, and no speaker components in the box).

The holes you mention are ports... They make things louder when configured properly.

http://i52.photobucket.com/albums/g35/z0mgluke/Image0041.jpg

****ty picture, but you get the idea of what I run... Box tends to tip over, so I have to prop the magnet up with some rolled up boot carpet. I finally have a box that the sub was intended for... 60L :) Good ol' stolen box from Millert85 lol

it also doubles the room taken up by your subs

It wont hurt them at all.... Some look better, some dont.

Ports are there to tune different Frequencies for different enclosure/sub combinations.
Some work better with, some work better without depending on Manufacturer Specs.
And preference comes into play with what music you listen too aswell.:D

Most important thing is to swap the polarity of the subs. (swap positive and negative for each woofer)
Otherwise they will be 180 degrees out of phase with your speakers and won't sound the same. Bass will be muddied, sub wont be as dominant. (although can have good results too)

The reason it sounds different is the sub is pushing out when your speakers are pushing in, so you get cancellation of some frequencies.

besides that the other points have been covered, slightly more box volume (could be good or bad) can be solved by filling box with anything if its an issue.

takes up a bit more space outside of the box.

Protects the sub cone (but exposes the back of the sub to scratches)

Sound wise once you have taken care of the volume and polarity there is no difference watsover, people who say there is extra motor noise or air noise are kidding themselves (it's in the boot and wont make any audible difference)

Go for it!

Most important thing is to swap the polarity of the subs. (swap positive and negative for each woofer)
Otherwise they will be 180 degrees out of phase with your speakers and won't sound the same. Bass will be muddied, sub wont be as dominant. (although can have good results too)

The reason it sounds different is the sub is pushing out when your speakers are pushing in, so you get cancellation of some frequencies.

besides that the other points have been covered, slightly more box volume (could be good or bad) can be solved by filling box with anything if its an issue.

takes up a bit more space outside of the box.

Protects the sub cone (but exposes the back of the sub to scratches)

Sound wise once you have taken care of the volume and polarity there is no difference watsover, people who say there is extra motor noise or air noise are kidding themselves (it's in the boot and wont make any audible difference)

Go for it!


What if it is out of phase in a ported box?

No difference between out of phase ported and out of phase sealed/out of phase IB etc still out of phase.

Unless your box design is so far out that your port is producing out of phase waves, but then it'll all sound like crap anyway and you'll have bigger things to worry about than the phase.

I currently run my subs out of phase but they are passed so low it doesnt matter and it helps to mask there location, either or though. Neither is right or wrong all about what sounds good to you.

Generally if you don't know any better, keep everything in phase,

tweeters mids and subs.

What if it is out of phase in a ported box?

Same thing as in a sealed box, woofer works really hard for no reason.

This is my a$$, its huge and red:bowrofl:

man all this info has me phased.....

my headunit has adjustment for that stuff, and played around with it then left it std lol
pretty much everything on neutral when it comes to settings is good.... then a little bit here and there


i though ppl reverse mounted their subs so it is like an in your face kinda thing, i dont think some subs sit as nice inside out though (in terms of fittment to the enclosure) need more work and more screws

Most important thing is to swap the polarity of the subs. (swap positive and negative for each woofer)
Otherwise they will be 180 degrees out of phase with your speakers and won't sound the same. Bass will be muddied, sub wont be as dominant. (although can have good results too)

The reason it sounds different is the sub is pushing out when your speakers are pushing in, so you get cancellation of some frequencies.

besides that the other points have been covered, slightly more box volume (could be good or bad) can be solved by filling box with anything if its an issue.

takes up a bit more space outside of the box.

Protects the sub cone (but exposes the back of the sub to scratches)

Sound wise once you have taken care of the volume and polarity there is no difference

watsover, people who say there is extra motor noise or air noise are kidding themselves (it's in the boot and wont make any audible difference)

Go for it!


So i have to swap the red and black wires around? also what do you mean by out of phase ported. Should i put any holes in the box or leave it all sealed.
I like the way the subs look reversed so i would like to keep it this way.
Thanx
Darren

Yeah swap the wires. EITHER at the sub or at the amp. (not both)

Sorry, your box is currently sealed? If so leave it at that and see how it sounds. Putting holes will do v little, you need to make ports, port design (length, width, no of ports) and the reasons for them is complicated, but basically porting a box will make it more efficient and louder, but will only make it louder at certain frequencies, below that it will be quieter (and sometimes muddier).

So this comes at the cost of low end extension (deep deep notes). From a purists point of view you want a nice flat response across the whole spectrum; sealed generally gives this.

In car audio power is cheap so efficiency isnt all that important (unless your competing in SPL comps)

Sealed boxes are very forgiving in terms of getting the wrong volume etc compared to messing up a ported box which will sound like rubbish.

Depends where your sub is in the boot.


Idealy with a vented sub box, putting the sub at the very front of the boot (close to the boot lid) and have them facing behind you would put the signal in phase the most. When you have a signal that's in phase or very close to you get a greater bass response and volume mainly because the soundwaves bouncing off the materials in your car are travelling at the same place and time as the initial soundwave. Generally speaking having them facing towards you (in the drivers seat) would put the soundwaves out of phase. Reversing the phase on your subwoofer will not help this as the reverberated signals will be exactly the same except inverted (back to front) of the origional signal.

Here's a link which might help you out

http://www.fastfoursforumscarclub.com/temp/fhrxstudios/faq.asp#24

End of the day, it's what you want, don't forget about boot space or whatever other issues you may have, it's your sound system, therefore do whatever you like with it!

thanx for all your help i have decided to invert them only because i like the look better.
here is the finished product.
http://img.photobucket.com/albums/v622/moparcm6/DSCF2726.jpg
http://img.photobucket.com/albums/v622/moparcm6/DSCF2728.jpg

Some amps have a switch that switches polarity 180 degrees (mine does anyway) so if yours has it, you could just leave them wired normally and flick the switch

Isn't this called Power Mounting? At least thats what they said on Pimp My Ride lol

Depends where your sub is in the boot.


Idealy with a vented sub box, putting the sub at the very front of the boot (close to the boot lid) and have them facing behind you would put the signal in phase the most. When you have a signal that's in phase or very close to you get a greater bass response and volume mainly because the soundwaves bouncing off the materials in your car are travelling at the same place and time as the initial soundwave. Generally speaking having them facing towards you (in the drivers seat) would put the soundwaves out of phase. Reversing the phase on your subwoofer will not help this as the reverberated signals will be exactly the same except inverted (back to front) of the origional signal.

Here's a link which might help you out

http://www.fastfoursforumscarclub.com/temp/fhrxstudios/faq.asp#24

End of the day, it's what you want, don't forget about boot space or whatever other issues you may have, it's your sound system, therefore do whatever you like with it!


Not quite rite there mate. The location would depend on both the size of the car (whats good for one car isnt good for another due to size differences), and secondly, it depends on what frequency your playing at. 20hz may be in phase, but, due to the distance is 30hz still in phase ? or is 50hz ? (jst examples)

Not quite rite there mate. The location would depend on both the size of the car (whats good for one car isnt good for another due to size differences), and secondly, it depends on what frequency your playing at. 20hz may be in phase, but, due to the distance is 30hz still in phase ? or is 50hz ? (jst examples)

Ah...I know what you mean, but i'm talking about individual frequencies, 30hz will never be in phase with 50hz because it's a different frequency, therefore different wavelength. I am talking about phase from individual frequencies at Xdistance, in a general car boot, (as you can see in the diagram i posted earlier) when the subwoofer is facing the rear of the car and is very close to the rear of the boot, the reflected signal occurs very quickly after the initial signal being emitted, so the reflected signal is in close phase to the initial signal which in a subwoofer emits in all directions. (the lower the frequency the more omnidirectional it becomes) So you have the reflected signal in close phase with the original signal which therfore stronger bass reproduction.

Don't forget, the 50hz signal is going to be the same wavelength when reflected, and the close the subwoofer is to a reflective surface, the quicker the reflection will take place and the close it will be in phase. (unless it's around or over 194 dB where it starts acting like a shock wave lol)

I mean no offence or anything man! Just giving my 2 cents!

Cheers!

Just a question mate, how did you manage to mount the amp on the
side of the boot there! i wan't to put it in a similar place but can't figure out how, my amp is pretty big too...either that or i'm going to screw it onto the back or side of the subwoofer box (is that a good idea or bad idea and please explain lol) at the moment it's mounted seperately on the floor of the boot but it's taking up too much space.

there is a bracket and bar that runs down there so i bolted it to that

there is a bracket and bar that runs down there so i bolted it to that

Ah i see! Near that bracket that holds the arial base in yeah? i never thaught of that lol.

I think i might screw mine into the back of the subwoofer box.

imo subs should only ever be inverted when they have a huge ass magnet on the back of em
like yours :D
the subs i have atm (stop gap) have about a 4inch magnet on a 12 inch sub
invert them would look like complete crap

inverting the soundstream tarantulas on the otherhand :drool:

imo subs should only ever be inverted when they have a huge ass magnet on the back of em
like yours :D
the subs i have atm (stop gap) have about a 4inch magnet on a 12 inch sub
invert them would look like complete crap

inverting the soundstream tarantulas on the otherhand :drool:

Hehe

Are they the triple magnet ones?

if so, i'd not want to invert them, because chances are you would't be able to close the boot lolz