# What is a correct loudspeaker connecting scheme and why? [closed]

Thinking of "what would be best shape for a subwoofer box?" i came to idea of a barrel, with its sides (or covers) "replaced" with speakers:

I have stereo bass amplifier which is fed from single signal source. So there are 2 possible ways to connect a terminals to an amplifier channels:

• With zero phase offset: this would double the pressure inside (lower or higher than air), if is compared than a single speaker in a barrel

• With inverse phase offset: this would cancel out internal pressure. When front speaker's diaphragm would be pushed forward, back would be also pushed forward.

I am interested what scheme is used and why - what consequences inner pressure would introduce to bass sound, what effect would create those two schemes?

## closed as off-topic by Jon Custer, Aaron Stevens, Kyle Kanos, JMac, AccidentalFourierTransformNov 6 '18 at 17:38

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• You want the sound to come out in phase from both loudspeakers but also should note that using a bass reflex will improve the efficiency of your loudspeaker system. – Farcher Oct 20 '18 at 14:07

At $$100\,\mathrm{Hz}$$ the wavelength of sound is about $$3.4\,\mathrm{m}$$. If your cabinet is substantially smaller than that, which it probably is, then it's well-modelled as a point source. This means that you want the speakers in-phase, or you'll end up with very dramatic cancellation.