Unfortunately both Chuck Hutton and Guy Atkins posted earlier on this
list (beginning of September) that the Duo's performance was
underwhelming, Chris, so it seems that your experience is not unique.

best wishes,
Nick
 At 16:00 2019-01-18, Chris Black wrote:
Having been a DXer and Ham for many years, I am enjoying getting 
back in the hobby and seeing familiar names.
Although the Duo is at the lower end of the SDR price point scale, 
hearing some positives I thought it would be a good place to start.
After running extensive simultaneous reception tests on MW I have 
been underwhelmed by its performance. With some carriers barely 
above the noise floor and not a peep of audio, I hear clear audio, 
often on multiple station on the Icom 7300.
I have made no adjustments to the default ExtIo settings and was 
wondering what other users have found and what settings changes, if 
any, improved reception.

Best 73 to all
Chris

Sent from my iPhone