A total of 3 reviews of this product on Reddit.
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A Boom speaker. They’re really good, loud AF, and the next time you have £100 spare you can get another, or as many as you like, for a top quality, portable bluetooth stereo sound system. I don’t know what other brand speakers are like, but I have 2 Booms and they are ace.
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You could buy a few rechargeable, waterproof Bluetooth speakers and they’ll serve you well for far less than you’d pay for a new, integrated boat audio system.
I have the Ultimate Ears Boom 3 and the Wonderboom, and they’ve lasted me years. They’re plenty loud and have like 8 hours of playtime. They can also sync up so you can play the same audio through two different speakers.
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Might be different in the uk but here’s the link:
Boom 3- £81
https://www.amazon.co.uk/Ultimate-Ears-Wireless-Bluetooth-Waterproof/dp/B07G6MBCG3/ref=mp_s_a_1_2?keywords=boom+3&qid=1580852677&sr=8-2
Boom 2-£79
https://www.amazon.co.uk/Ultimate-Wireless-Bluetooth-Speaker-Water-Phantom-Lite/dp/B07J36VFFQ/ref=mp_s_a_1_3?keywords=boom+2&qid=1580852769&sr=8-3
These are new btw
Edit: I checked on amazon us and theres a huge price difference. That’s crazy.