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Hi royb, We appreciate your Inquiry! Thank you for reaching us. Let’s address your query about the compatibility of 15.6W 4.9ft Universal AC Adapter with a JBL Boombox. The JBL Boombox typically requires a power supply of 20V. The 15.6W (watts) mentioned in the adapter description doesn’t directly correspond to voltage. To be compatible, the adapter should provide 20V output. The current (measured in amps or A) is also crucial. The JBL Boombox requires a current within a specific range. Unfortunately, the provided adapter’s current rating isn’t explicitly mentioned. We need to verify if it falls within the acceptable range for the Boombox. Check if the adapter’s connector matches the input port on the JBL Boombox. The Boombox typically uses a barrel connector for its power input. Feel free to reach out if you have any more questions or need further assistance! Yanne Insignia Support
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