Xtant 3150c accessory ports and balanced input (pin outs)

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I have an Xtant 3150c here, nice system little amp and quite rare over here in the UK. The accessory modules are like hens' teeth and I really want a 2 or 3 band parametric. So my thought was to basically clone a couple of stages out of my AudioSystem PM-4 (4band parametric all SMT works well) and make my own accessory module. For this I really need to know the pin outs, I'm assuming its signal and earth x2 (left and right) and power which I'm guessing ±15v and earth. Anyone know the pin outs, audio level and how much power I can safely draw.

Likewise I'm modding a nak MB100 and may convert it to balanced output so what does the balanced input module look like?

Anyone done anything similar?

thanks of any assistance
 
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