Second this. I find the M15 to be a nice pairing as well. Stellia is very easy to drive so I don't find the portable solution misses anything from my desktop stack (Topping D90 MQA/A90), which uses the same DAC chip, which is the same as the SP2000 as well. And yes, I know the DAC chip isn't the end all, be all relative to the rest of the chain and the implementation, etc. Just pointing out the similarities.FiiO M15 in headphone overdrive mode. I use the combo and find it great.
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