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When I received the Porta Pro X I plugged it into my computer's jack. The bass was powerful (perhaps overly so) but was muddy and lacked definition. The mids and highs were ok but not very extended. I would rate the overall sound as above average.
Then I plugged it into my Geek Out external DAC/amp and it was transformed. The bass was much better controlled, the mids and highs became more alive. Definitely a more enjoyable listen and shows what the headphones are capable of when properly driven. For the price, it deserves a 5-star rating. But unamped I'd rate as 3.5 stars.