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The PGA04 Speaker Simulator with Loadbox from Palmer is a DI (direct injection) box with a built-in loadbox and is designed to be used with guitars. It contains an integrated load register, enabling the Speaker Simulator to bypass using a loudspeaker and directly connect to tube amplifiers of up to 100W. There is an unbalanced jack socket and balanced XLR connector for directly picking up the guitar's signal. A filter section with various filters provides a realistic simulation of classic guitar loudspeaker sounds.