The Fidelio X2HRs are in the $150 to $300 price category for open-back headphones and are amazing for the price. They are arguably the most fun-sounding* headphones in this range.
Philips Fidelio X3 Headphones Review — World Bolding
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Philips Fidelio X2 - Reviews Headphone Reviews and Discussion - Head -Fi.org
Philips Fidelio X2HR Headphones Review — World Bolding
Philips X2HR Fidelio Over Ear Headphone, Black : Electronics
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Philips Fidelio X2 - Reviews Headphone Reviews and Discussion - Head -Fi.org
Picked up this like new guy for $80. Loving them. : r/headphones
Got my self a set of Philips X2HR : r/headphones
Philips Fidelio X2HR Review: STILL a BEAST in 2019!!
Philips Fidelio X2HR Review
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PHILIPS Fidelio X2HR Over The Ear Open Back Wired Headphone 50mm Drivers- Black Professional Studio Monitor Headphones with Detachable Cable : Electronics