I looked up your manual. It says the 9102D is a mono amp, but it has 2 sets of speaker terminals.
I suspect the the 2 positives are the same and the 2 negatives are the same.
You could check that with a volt meter.
It gives you an easy way to put 2 speakers in paralell, which is what you want for a 2 ohm load. If your speakers are already wired in paralel, such as inside the box, then you have only one lead to hook up.

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