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As mentioned, when the other speakers are not connected and flapping in the breeze, they will act as passive radiators. This is not a good thing in this case. The inward motion of the two working speakers will push the two non-working speakers out. The out-of-phase energy from the two pairs of speakers working in reverse causes cancellations at the frequencies in which they both reproduce equally. This will be mostly in the low end where the passive radiators are actually displacing air outside of the cabinet. High frequencies are not as affected because they are not causing the passive radiators to move much if at all.
A way to cheat this without removing speakers is to simply short the speakers that are not in use. If you have a stereo cab with left and right inputs you can simply use an old guitar cable or speaker cable that has one end shorted to itself. This will cause the speaker to resist moving in its gap, this is because you have in essence created an inductor, and trying to move the speaker cone will be met with large amounts of resistance as the coil is now trying to produce electricity that has nowhere to go. If you have a loose speaker laying around you can test this yourself. Simply short the speaker's leads and try moving the speaker cone. It will not be easy. Open the leads and it will move freely again.
A way to cheat this without removing speakers is to simply short the speakers that are not in use. If you have a stereo cab with left and right inputs you can simply use an old guitar cable or speaker cable that has one end shorted to itself. This will cause the speaker to resist moving in its gap, this is because you have in essence created an inductor, and trying to move the speaker cone will be met with large amounts of resistance as the coil is now trying to produce electricity that has nowhere to go. If you have a loose speaker laying around you can test this yourself. Simply short the speaker's leads and try moving the speaker cone. It will not be easy. Open the leads and it will move freely again.
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