A 2.5mm to 3.5mm cable will also do the job. ts not too difficult to get such a cable. It will be available at nearly all electronics supplies shops. But as l_b_m said, you'll need to drop the plate to connect it.
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Alpine 9887 | TRU Tech S44 | Image Dynamics XS65 | Image Dynamics IDQ12 D2V2 | Connection Audison |