The Poly with a leather case is sure a very elegant solution. However, it is a bit fussy with wifi (sometimes have to wait 5 minutes or more) and the batteries are always empty. Moreover, you can’t use your own software as you can with the pi (poly has no samba e.g., i.e. you have to take out the sd card to load files).
I would recommend some velcro straps and a power bank to feed both the pi and the mojo.
Question is where to put the bear.
I am expecting to be wearing a neck collar following neck surgery soon .(Too many hours squinting at computer screens over the years)
I expect conventional over ears will not work with the collar so I invested in some Sony WF-1000XM4 IEM’s
So far the sound is quite remarkable. I normally use Sennheiser HD800 and my over ear Sony 1000 XM4’s on Bluetooth. To be honest I was expecting the IEM’s to be a bit iffy but not the case.
Getting the ear buds seated is a bit fiddly at first (early impression) but the overall effect is really quite good, it will certainly be good enough for the 6 weeks in dock !!
The next delivery is a 1 Tb SD card for my phone so I can load up more that I have currently , I can sit and be “bored” with the Ring Cycle for hours on end …
This is taking downsizing a bit extreme I suspect 
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The XM4’s are absolutely great. Very underrated.
haha @AMT 
Lol, some furry headphones you got there.
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Headphones are known as cans so there is a tenuous link there 
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One of four pairs of Hifiman phones, now with a cable that surprised me!
These “humble” HE-400i are really fresh and vital, with these team mates!
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Senny’s HD820’s are THE BEST closed-back headphones I have ever heard. I was sat-on-the-fence about these for a while, mostly because of the mixed reviews.
But MY-OH-MY, with the FiiO M17 I have never heard anything like it 
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Oh man, I am looking for a pair of closed-backs, and I’m very partial to the 800S open-backs. I wasn’t going to get a pair so similar, but you’re close to changing my mind.
I presume you’re using a balanced cable? Again, there’s something about the HD800S and the balanced output on the M11 that I can’t get enough of ATM. For the record, I’m generally sceptical about balanced headphone cables.
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I absolutely love me adore my HD800’s (the original, and not the HD800S). They’re impeccable for classical music especially, and are a thrilling listen.
The only problem with them is being open-backed, they leak like hell (as you know) and my other-half complains, and the bass/sub-bass is less than ample.
I’ve gone through so many pairs of closed-backs, looking for the right pair: Sony MDR-Z7, MDR-Z1R, Beyerdynamic T5p, Beyerdynamic DT1770 PRO etc. The closest I’ve got to my ideal pair is the Beyerdynamic T5’s, which are actually very, very good.
But these HD820’s are something else entirely. They just eclipse ever other pair of CB’s I’ve ever heard.
If you like the HD800’s/HD800S and you’re looking for a CB set, I would highly recommend an audition.
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Yes, 4.4mm. And there’s plenty of power, even for these. The M17 delivers much more power via balanced than via single-ended.
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Nothing exotic, it’s the Nordost Heimdall 2. A good solid engineered cable, nothing from “Santa’s workshop”. 
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Some other closed back headphones to consider along with the Sennheiser HD820 (a very good choice)
Focal Radiance and Stellia
Dan Clark Audio Aeon 2 and Stealth
And the already mentioned Beyerdynamic T5, especially when used with a portable device.
There is nothing special about a balanced cable versus a single ended cable except for the fact that using a headphone via the balanced output provides more power. When listening to headphones via a portable music player or portable headphone amp the “extra” power provided by the balanced connection is well worth the cost of reasonably priced balanced cable. Balanced versus single ended makes much less of difference on a powerful desktop headphone amp. For example the Benchmark DAC3 HGC, a very nice DAC with a built-in headphone amp, only has single ended connections available and they sound great and easily rival the balanced outputs of must headphone amps.
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A small Easter treat:
The rest of the family is out shopping today. Great day for the ears, troubled times for the wallet… 
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You can’t spend it when you are dead 
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My reasoning exactly. It does not change however the fact that my wife and daughter left the house cheering ‘Our turn now!’ this morning…
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They are obviously going to buy another pair except in pink
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