Do you have a question about the QUAD 520 and is the answer not in the manual?
Instructions for packing the amplifier for service or return.
Guidelines for rack or free-standing mounting and ventilation.
Details on voltage selection and AC input connector.
Information on AC supply fuse rating and location.
Wiring details for XLR input/output connectors (IEC/NAB).
Notes on input and output phase relationship.
Guidance on grounding for optimal performance and preventing hum.
How to switch on and adjust gain controls.
Details on thermal protection, short circuit, and overload protection.
Information on field servicing and returning the unit for repair.
Details of the 12-month warranty and its terms.
Technical performance data including frequency response, power output, impedance, and dimensions.