Okay, we say 3 individual bass speakers in a single inclosure probably being driven by a single mono sub woofer amplifier.
Yes, you can disconnect the one bad speaker but make sure the other two can handle the load of the missing speaker.
Make sure the other two speakers can handle the wattage loss of the one bad speaker and make sure the other two speakers are properly wired for 2, 4, or 8 ohms so that the amp can drive them safely. Do you know what the ohms ratings are of the speakers? You might have to rewire the existing two speakers so the amp doesn't blow up.
I had a friend who had a powerful sub woofer setup in his car using three 10 inch speakers in one cabinet so I know what you are talking about.