Reverse Polarity

I have just purchased 2 of the "Alto TS312s sub bass units what setting do I use regarding the "reverse polarity switch, in on one . on both or neither ? confused, thanks
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  • If you are using the Alto subs with Alto normal 2 way cabs the polarity on both should be on normal, the purpose of the polarity switch is to make sure that all of the bass drivers, those in your normal cabs + your subs are all in unison with each other, in other words the cone of the woofer (bass driver) will be in phase, the way to check that they are in unison is to place the sub and the normal cab facing each other, then play a tune with plenty of deep bass then switch the polarity on the sub to hear the difference, if the bass in dramatically reduced is because the cone of the loudspeaker is cancelling the other (out of phase) switch it back and it should be louder and that's how it should be for both sides.
    It has been known that the actual internal wiring was wrongly fitted in the first place, on these occasions no harm will be done but at least you can test even your own 2 way cabs to make sure that they are in phase.
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  • Thanks Phil, The top speakers are "Mackie" 12 inch 1000 watt powered cabs. I will give your "test" a go and post the results. I just don't seem to be getting the volume/bass response I was expecting !
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  • Being you are using the Mackies could be the reason that they maybe out of phase, personally if you are adding subs go for 15" or better still 18" you won't get much Bass out of a 12" driver, I have been in the sound business for a good many years and the shop should of advised you to go larger, If you bought them from a store swop them up for bigger subs, if you bought second hand sell them, like you said you have a pair of 12" Mackies so to get some bottom end bass you got to go 15 or 18" my friend, but try the method above first, it could be out of phase, good luck.
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