User ManualTable of ContentsFront Cover1Important Safety Instructions2Introduction3Contents3Features3Hookup Diagrams4Rear Panel Features51. Main Input52. Loop Out53. EQ On54. Low EQ55. Mid EQ56. Freq57. High EQ68. Level69. Power Light On610. Thermal LED611. Sig/Limit LED612. Power613. IEC AC Receptacle6Placement7Room Acoustics7Rigging8Rigging Design Practices8Rigging Hardware and Accessories9Rigging Notes9Thermal Considerations9AC Power9Care and Maintenance9Appendix A: Service Information10Appendix B: Connections11Appendix C: Technical Information12HD1531 Block Diagram13HD1531 Graphs and Dimensions14HD1531 Limited Warranty15Rear Cover16Size: 3.1 MBPages: 16Language: EnglishOpen manual