Reverse Mounting Subs Question????????

[spare69 2]

I am Thinking about reverse mounting 2 FI BL 12's and was looking at some researcha bout wiring and reverse polarity and what not. When i mount them in reverse should i reverse the polarity aswell? ???

[jonbearsmt 919]

the only time you need to reverse polarity is when you are inverting 1 sub and mounting another normally in the same encloser.

[spare69 2]

oh ok thx!

[altoncustomtech 773]

the only time you need to reverse polarity is when you are inverting 1 sub and mounting another normally in the same encloser.

Actually, when inverting any speaker to keep it in phase with the rest the polarity needs to be inverted, as you stated there for two subs in one enclosure with only one inverted. Wouldn't you want to invert the signal on both subs when both are inverted so that the subs and the speakers in the front are all running the same polarity to keep from having cancellation in the frequencies they'll share?

[jonbearsmt 919]

you just added confusion.

the door speakers have nothing to do with the phase of the subs.

[Duran 387]

Reverse the polarity of all drivers being mounted inverted.

[///M5 2,833]

you just added confusion.

the door speakers have nothing to do with the phase of the subs.

Exactly. Of course the final combination is what is really important.

[On3Hundr3dProof 19]

if your inverting both you can either reverse the polarity on both or leave them both normally as long as they are in phase. I'd try both to see what sounds better in a particular build

[spare69 2]

if your inverting both you can either reverse the polarity on both or leave them both normally as long as they are in phase. I'd try both to see what sounds better in a particular build

Lol this is the only one that makes sense to me lol. Thanks bro. Ill try leaving it the same.

[jonbearsmt 919]

and that was my point.

[jonbearsmt 919]

the only time you need to reverse polarity is when you are inverting 1 sub and mounting another normally in the same encloser.

i guess it was confusing the way i ended my statement,

you would reverse the poliatiry on the sub that is reversed, and normally on the sub that is mounted normally, that way they are both pushing the same way and pulling the same way,

[spare69 2]

Yea i got you thank you both I will try this out when i do my New install.

[Impious 1,476]

if your inverting both you can either reverse the polarity on both or leave them both normally as long as they are in phase. I'd try both to see what sounds better in a particular build

This.

[edouble101 314]

LOL at these posts.

Unless you have mechanical noise the driver will sound the same mounted normally (magnet in) or inverted (magnet out). There is absolutely no need to reverse polarity. If you mount one drive inverted and one "normal" you still would not swap wires.The exact same amplitude is coming form the front side of the cone as there is from the back side. Obviously if the driver has a suspension misalignment this may not be true.

If you do think that you setup sounds differently with inverted drivers consider driver volume displacement. The volume of the enclosure will be greater and tuning will be lower compared to "normally" mounted drivers.

[emh9009 199]

If you mount one drive inverted and one "normal" you still would not swap wires.The exact same amplitude is coming form the front side of the cone as there is from the back side.

If you have two subs sharing a box with one inverted for some reason you need to reverse the polarity. They would be "given the same directions" if not. "Push the cone away from the magnet" would mean that one sub would be pressurizing air inside the box (the iverted sub) and the other would be pressurinzing the air outside the sub, and visa versa. If you didn't have them wired differently there would be cancelation and possible damage to the subs. Someone correct me if I'm wrong.

[jonbearsmt 919]

LOL at these posts.

Unless you have mechanical noise the driver will sound the same mounted normally (magnet in) or inverted (magnet out). There is absolutely no need to reverse polarity. If you mount one drive inverted and one "normal" you still would not swap wires.The exact same amplitude is coming form the front side of the cone as there is from the back side. Obviously if the driver has a suspension misalignment this may not be true.

If you do think that you setup sounds differently with inverted drivers consider driver volume displacement. The volume of the enclosure will be greater and tuning will be lower compared to "normally" mounted drivers.

you are wrong sir.

[jonbearsmt 919]

If you mount one drive inverted and one "normal" you still would not swap wires.The exact same amplitude is coming form the front side of the cone as there is from the back side.

If you have two subs sharing a box with one inverted for some reason you need to reverse the polarity. They would be "given the same directions" if not. "Push the cone away from the magnet" would mean that one sub would be pressurizing air inside the box (the iverted sub) and the other would be pressurinzing the air outside the sub, and visa versa. If you didn't have them wired differently there would be cancelation and possible damage to the subs. Someone correct me if I'm wrong.

that is correct. they would be canceling each other out.

[///M5 2,833]

LOL at these posts.

Unless you have mechanical noise the driver will sound the same mounted normally (magnet in) or inverted (magnet out). There is absolutely no need to reverse polarity. If you mount one drive inverted and one "normal" you still would not swap wires.The exact same amplitude is coming form the front side of the cone as there is from the back side. Obviously if the driver has a suspension misalignment this may not be true.

If you do think that you setup sounds differently with inverted drivers consider driver volume displacement. The volume of the enclosure will be greater and tuning will be lower compared to "normally" mounted drivers.

So I guess you've never bothered to use a phase switch on a sub amp and actually listen, huh?

Probably love mechanical noises as well. Yummy.

[Impious 1,476]

LOL at these posts.

Unless you have mechanical noise the driver will sound the same mounted normally (magnet in) or inverted (magnet out). There is absolutely no need to reverse polarity.

There is if they were in proper acoustic phase before you inverted them.

If you mount one drive inverted and one "normal" you still would not swap wires.The exact same amplitude is coming form the front side of the cone as there is from the back side.

Exact same amplitude, yes. 180^o phase difference as well, which unless you reverse the polarity of one of the drivers will cause a rather severe case of cancellation.

[///M5 2,833]

Oh lord, I read his post as meaning if you flipped both no big deal. Complete yikes when I re-read it.

What happens when you add a sine and cosine? GREAT idea!