Single 2 ohm or single 4 ohm? I thought he was doing a DVC subwoofer here?
Also, is the amplifier Mono or multichannel?? The manual you posted was for a 4 channel amplifier? I assume this is indeed a mono amplifier.
If the amplifier is for sure mono, as long as each woofer + and - go to a + and - on the amplifier it will not matter which ones as they are all on the same connecting block. Just need to be sure the + is to + and - to -.
See here:
first one down on the right.