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Marshall Stanmore II Voice (2018) vs JBL Boombox (2017)
Marshall Stanmore II Voice (2018)

The Marshall Stanmore II Voice (2018) makes for a good, if unremarkable, Portable Bluetooth Speaker for people with a $300 budget.
The JBL Boombox (2017), however, is merely mediocre at its $399 asking price, when compared to similarly priced products, and won't satisfy the needs of most people.
In either case, we suggest that you first take a look at some other options at the $300 and $360 price points before committing to one of these - it's likely that you'll be able to find some better alternatives.
If you're still interested in learning more about the Marshall Stanmore II Voice (2018) and JBL Boombox (2017), however, we wrote a summary of what we could find about them:
The Marshall Stanmore II Voice (2018) got praised by Wirecutter (NYTimes) and SoundGuys - two highly trusted sources that perform in-depth hands-on testing. It was awarded the "Also great" title from Wirecutter (NYTimes) and "Best sound" from SoundGuys in their respective Portable Bluetooth Speaker roundups.
As for the JBL Boombox (2017), it wasn't able to earn a top spot in any roundups from trusted sources that conduct their own hands-on testing. Nevertheless, it managed to impress reviewers at Techradar, PCmag, and Expert Reviews enough to make it onto their respective shortlists.
We analyzed all of the review data that we could find on these two Portable Bluetooth Speakers. First, we examined sources that tested and scored both of these products - Techradar favored the JBL Boombox (2017) over the Marshall Stanmore II Voice (2018), whereas reviewers at PCmag haven't shown a preference for either.
Then we took a look at which sources liked them the most - we found that the Marshall Stanmore II Voice (2018) was best received by Top Ten Reviews - it gave it a score of 9, whereas the JBL Boombox (2017) got its highest score of 8 from reviewers at Techradar.
Lastly, we averaged out all of their review ratings and observed that the Marshall Stanmore II Voice (2018), with its 8.0 average, performed considerably better than most Portable Bluetooth Speakers - the mean score for the product category being 7.6 out of 10 - while the JBL Boombox (2017) managed an average of 7.3.
There's one caveat here - it might not be entirely justifiable to do a direct Marshall Stanmore II Voice (2018) vs. JBL Boombox (2017) review average comparison since they aren't priced the same and more expensive products tend to get higher review scores from some sources.
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