I used it on a small cassette speaker. There is power in this little thing! So much so that I'm going to add some woofers so we can't blow the 3.5-inch Dayton speakers it contains. Bluetooth works very well! He went through the house to the bedroom and was still playing. Even when the caravan is closed. The wide voltage range is great. I bought an adapter and powered it with a 20V Dewalt battery.
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