Micah,

The woofers in the EP800 and all conventional speakers operate in phase, whether or not it's a sealed or a ported system. If the two EP800 woofers were out of phase, there would be zero output, or virtually that.

Since you have installed a replacement woofer and amplifier yourself, you might have inadvertently reversed the connections to one woofer.

I'm sure you've already spoken to JC, but for the benefit of others, I'll post Ian's method of verifying if woofers are in or out of phase:

"If you want to check that you got the woofer installed correctly, remove the amp and disconnect the speaker wires from the back of the amp. Using a 9-volt battery, touch the speaker wires to the battery posts following positive to positive and negative to negative. Hold the wires to the battery connection. Both woofers should move out and stay there. If one moves out and one moves in and they stay there then the one moving inwards is out of phase. If one cone moves out and one moves in but returns quickly to the centre position then that woofer is not working at all."

You won't damage the woofers using a 9-volt battery.

Regards,
Alan

Alan Lofft,
Axiom Resident Expert (Retired)