Assuming you have the 676 HiFi, you definitely want the UP7DSP/MEC, UP 7BMW will not work. The MEC part allows the under-seat subs to work with the amp. I verified this with the Audiotech US distributor.
Re your old amp rack... yeah it looks a bit antiquated. I'm looking at the MUSWAY MW1000A for the trunk. I just started restoring a vintage MC so I'm not sure when I'll get around to it.
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