Also, the units you gave links too aren't correct for your situation either - the outputs on the empeg ARE line level outputs - these boxes are for when your head unit has an internal amplifier and you want to feed it into an external amp.

(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 6GB blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)