(Disclaimer: This is not a review but advice on how to avoid scams.) As for the JBL Charge 3 review, it certainly won't disappoint! It gets very loud for its size and the mids and highs are very clear. The bass is decent, but no window shakes. I don't have a 3 or 4 flip so can't do a side by side comparison but I've used it in the past and from what I recall this one sounds about 20-30% louder. . That's good for a price difference of $20. I've had several JBL products over the years and have never had a problem and definitely don't expect a problem with the Charge 3 ***THIS NEXT PART IS VERY IMPORTANT*** speaker but if you read it you'll find that the Majority (probably 90%) of the negative reviews are due to the buyer receiving a counterfeit device. This is easy to avoid. Revain uses multiple suppliers to deliver the same product and these suppliers change fairly frequently. Once your item is in the cart, you can see who is actually selling it. It is extremely important to ensure that the seller is on the JBL Authorized Seller list. I bought mine from Acoustic Sound Design's Revain and they are listed as authorized JBL dealers along with a few others. If the vendor's name doesn't appear on their list, you're probably getting a refurbished paperweight that's coming out soon, or just a fake.
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