Ingresar:     

Forum: General Discussion

Tópico: Subwoofer Polarity - Your advice please

Este tópico es antiguo y puede contener información incorrecta para la nueva versión.

Hi all,

Hopefully someone from this forum can enlighten me on this topic.

I have a JBL JRX118SP 18" Powered Subwoofer. Since I got it, about 5 months ago I have always had the polarity swith set to "IN". Now I'm wondering if that's really the best setup.

Can someone explain to me in plain english what the difference is or makes between having the "IN" and "OUT" polarity on this sub.

The sub has been, to my taste, working just fine, however I want to know if I'm missing something that could make it sound even better.
BTW...I have the crossover set to HPF.

Happy new year to everybody !!!!

ap

PS. Current temperature in Miami is 84 F & Clear Skies !!!! ...I just wanted to share that with my northern friends.(SMILE)
 
Mensajes Fri 28 Dec 07 @ 9:06 am
polarity has to do with positive/negative signal from your amp.

If the polarity is wrong you might end up with a dip or hump in the frequency response at the crossover frequency between the main speakers and the sub. The best polarity is often a thing that has to be tried out by listening or measuring.

In/out reffers to the the cone inside the sub. The cone will move either in or out to the connection.
If its wrong, you can reverse it.

Its usually a bit of trial, and listen... to what is best...

The quick and easy answer is that if you get a 'suck' instead of a 'blow' when the cone moves, the relative connections are reversed!

When the phase is correct, you will hear everything marginally clearer, which gives the impression of also being slightly louder, and voices and instruments are better defined, and better bass.

Or something like that...
Its a bit Greek to me too ;)



 
Or you could run bridged and suck and blow at the same time which is easier on the speaker and moves more air too.
 
mp3jrick wrote :
Or you could run bridged and suck and blow at the same time which is easier on the speaker and moves more air too.


It's Bridget not bridged, and I like suck and blow at the same time better, also. On a serious note, the reason you have a choice is some manufactuers (Carver), switched the pins on their balanced outputs.
 
I should have known you would pick that up and run with it Rick.
Too funny
 
Lets see AMaHM..yesterday you were talking about getting your co=workers to suck and blow...now you say you suck and blow..WTF man...make up your mind!!!
 
TearEmUp wrote :
Lets see AMaHM..yesterday you were talking about getting your co=workers to suck and blow...now you say you suck and blow..WTF man...make up your mind!!!



Come on Terry keep up. Yesterday it was getting itouched, today it's I LIKE suck and blow. Of course I was referring to sub woofers, you know, the way they move in and out.
 
Guys,

Thanks for all your comments.

As a matter of fact, I used the sub this past weekend and noticed that I did not feel any boom ( blow) coming out of the vent holes on the box while in front of the subwoofer...however, everything sounded ok for me at that point, so I never touched the switch. Hopefully this didn't harm the sub.

I will give it a try this weekend with the switch in the "OUT" position and listen/feel the difference.

Love this forum....!!!!

ap


 
A Man and His Music wrote :
TearEmUp wrote :
Lets see AMaHM..yesterday you were talking about getting your co=workers to suck and blow...now you say you suck and blow..WTF man...make up your mind!!!



Come on Terry keep up. Yesterday it was getting itouched, today it's I LIKE suck and blow. Of course I was referring to sub woofers, you know, the way they move in and out.



Thank GOD I was starting to worry. If you switched team I do believe thats one of the seven signs of the apocalypse.
 
Nope, still batting right handed.
 
aparson wrote :
Guys,

Thanks for all your comments.

As a matter of fact, I used the sub this past weekend and noticed that I did not feel any boom ( blow) coming out of the vent holes on the box while in front of the subwoofer...however, everything sounded ok for me at that point, so I never touched the switch. Hopefully this didn't harm the sub.


If you feel/hear the sub evenly throughout the location you are playing it is set up right. If for some reason the phase of the top speakers and sub do not align you will, like said before, notice a dead spot or hot spot at one or more places in the room. You could then try to use the switch although in most cases a better solution will probably be to move the sub (or top speakers) to get better phase alignment. The switch will shift the sub phase 180 degrees so in practical terms it will reverse the effect which in most cases will not be what you are looking for. Of course if you use a speaker processor which has phase alignment you can use that..
 


Thanks man, I will take that into consideration when I do the test later today.

Saludos,

ap



 
A Man and His Music wrote :
mp3jrick wrote :
Or you could run bridged and suck and blow at the same time which is easier on the speaker and moves more air too.


It's Bridget not bridged, and I like suck and blow at the same time better, also. On a serious note, the reason you have a choice is some manufactuers (Carver), switched the pins on their balanced outputs.

ive got to chime in too, suck and blow at the same time when in bridged mode? what are you on about? bridged mode is easier on an amp than stereo? lol
 


(Los tópicos y foros antiguos son automáticamente cerrados)