I am digging the sound out of this combination but as you may know the output level of the DB924 is too low to fully power the QSC USA 900 power amp. I have heard of devices that boost signal between pre and power amp but don't know a thing about them. Who makes them? What are they called? What type of enclosure do they come in? (rack, little box, Pile of wires?) I am awaiting shipment of a Rane EQ which has input and output gain controls. This may be all I need but I am curious about other possibilities. I need help!.........on this subject.