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If each sub is wired to its own channel thats a good start.
If they are not hes full of crap and anyone who says different doesnt know a thing, so beware.
If both speakers are wired to one terminal on the amp its not good news.
You can probably live with them being in a common chambered box, but there are drawbacks.
If your friend thinks Im wrong send him here. He needs a lesson.
But heres the short of it.
With two different speakers they can not be wired to one terminal, mono, bridged, series. They MUST be wired separate. Basically the motor consists of a magnet and a VC former with the voice coil wire wrapped around it. Now they could utilize different wires between subs, different spiders, hell different metal in the motor structure. All of it has an effect on the Thiele Small parameters of the sub. If boths subs T/S specs are not identical (within reason here) then they wont pull power the same from the amp. Their impedance will change at different rates...
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-Ryan
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