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Denon Envaya (2017) vs Audio Pro Addon C3 (2018)
Denon Envaya DSB-250BT (2017)
The Denon Envaya DSB-250BT (2017) and Audio Pro Addon C3 (2018) make for good, if unremarkable, Portable Bluetooth Speakers at their respective budgets.
With that said, while they both should serve reasonably well, you might want to look into other options at the $330 and $370 price points - it's likely that there are some better alternatives available.
If you want to learn more about the Denon Envaya DSB-250BT (2017) and the Audio Pro Addon C3 (2018), however, we prepared a summary of the information that we have:
The Denon Envaya DSB-250BT (2017) was well-received by reviewers at Techradar, a trustworthy source that performs unbiased hands-on testing. It did great in their "The best Bluetooth speakers 2020: the top portable speakers for any budget" roundup - they named it their "The most durable Bluetooth speaker", which, by itself, suggests that it's a noteworthy product.
Moving on to the Audio Pro Addon C3 (2018): no sources that perform reliable and objective hands-on testing have included it in their Portable Bluetooth Speaker roundups, which usually means that a product doesn't make for a good purchase.
We conducted an analysis of all of the review data that we could find on these two products. First, we focused on sources that tested and rated both of them, like What Hi-Fi?, and learned that they all showed a preference for the Audio Pro Addon C3 (2018).
Then we took a look at the highest review scores that these two Portable Bluetooth Speakers received. We found that the Denon Envaya DSB-250BT (2017) managed to earn a rating of 10 from Pocket-lint, whereas the Audio Pro Addon C3 (2018) got its highest, 10, score from reviewers at What Hi-Fi?.
Lastly, we averaged out all of their review ratings and observed that the Denon Envaya DSB-250BT (2017), with its 8.8 average, performed considerably better than most Portable Bluetooth Speakers - the mean score for the product category being 7.6 out of 10 - while the Audio Pro Addon C3 (2018) managed an average of 10.0.
There's one caveat here - it might not be entirely justifiable to do a direct Denon Envaya DSB-250BT (2017) vs. Audio Pro Addon C3 (2018) review average comparison since they aren't priced the same and more expensive products tend to get higher review scores from some sources.