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Why am I getting better bass with my two "subs" out of phase?

post #1 of 8
Thread Starter 
Here is my setup for my home theater subwoofers. I have a old Harmon/Kardon AVR-25 receiver as my sub's amp. Connected to it are two Cerwin-Vega Re30 with the tweeters and midranges disconnected. So just the 12" woofers are connected. One "sub" is connect to the left channel output and the other to the right. The "subs" are up against a corner of my room facing out. One sub is directly on top of the other, making a "tower of power" as I call it.

My question is why do I get better, more powerful bass with them 180 degrees out of phase? I always thought that if speakers are in phase there output combines but if there 180 out of phase they try to cancel each other's output out.
post #2 of 8
Quote:
Originally Posted by zertman View Post

My question is why do I get better, more powerful bass with them 180 degrees out of phase?
One of them must be wired with reverse polarity inside the cab, or you did so with one of the speaker cables. BTW, you'll get a better result with the subs on opposite ends of the room. Search 'smoothing room modes'.
post #3 of 8
Quote:
My question is why do I get better, more powerful bass with them 180 degrees out of phase? I always thought that if speakers are in phase there output combines but if there 180 out of phase they try to cancel each other's output out.

That's coz may be your room acoustics are kicking in. My front right speaker has to be set out of phase (polarity reversed) in order for it to be in phase with the rest of the speakers. Same speaker when swapped with the left main works fine with correct polarity. The right side of my room causes the right main to go out of phase, which I correct by reversing the polarity.
post #4 of 8
Quote:
Originally Posted by braveheart123 View Post

That's coz may be your room acoustics are kicking in.
Not when this is the case:
Quote:
One sub is directly on top of the other, making a "tower of power" as I call it.
post #5 of 8
Yes you are right. They are already co-located.
post #6 of 8
Quote:
Originally Posted by braveheart123 View Post

Yes you are right. They are already co-located.

I have only seen Bill wrong once, but that wasn’t related to SW’s. biggrin.gif
post #7 of 8
Thread Starter 
Thanks for the replies.

I guess when I was rewiring the internal speaker wires I could have accidentally connected one woofer wrong. I will check the internal wires.

My receiver has a fixed crossover for the sub out at 120hz. If I move one sub to the back of the room, wouldn't I notice the higher bass tones coming from the rear? Would making the front sub a little louder combat that?
post #8 of 8
Quote:
Originally Posted by zertman View Post

My receiver has a fixed crossover for the sub out at 120hz. If I move one sub to the back of the room, wouldn't I notice the higher bass tones coming from the rear?
You will. Time for a better receiver.
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