The difference as Mal stated is very miniscule. I currently have both the 320hm and 250ohm ATM, ad the 600ohm will be here in two days. I have already owned the 600ohm twice, with better equipment (I stepped down to a simpler setup). The difference between the 32 and 250ohm is less than 5%. It is important to know that the models of the PRO and Edition product families do not differ noticeably in terms of sound, provided that they have the same impedance (e.g. the 250 ohm DT 880 Edition and the 250 ohm DT 880 PRO sound the same). In comparison to ATH-M50x: Both are flatter in the middle and have a bit more trebles. 80 Ohm is overall flat and more natural, easier on the ears with long term use. 250 Ohm is a bit more U-shaped than both 80 ohms and ATH-M50x, more targetted at analytical listening. I'm using this reference from the same site with previous ones. The Beyerdynamic DT 250 (official site) is a closed-back, wired headphone that’s available in 80 ohm and 250-ohm varieties. I’m reviewing the 80ohm version, which is generally thought to be a touch warmer in its sound signature, though Beyerdynamic claims they were shooting for similar performance. Dynamic. Diffuse-field equalised. Impedance: 250 Ohm. Sensitivity: 96 dB/mW. Frequency response: 5 Hz - 35 kHz. Weight with cable: 364 g. Weight without cable: 271 g. Includes a 3 m coiled cable with 3.5 mm jack, a screw on adapter to 6.3 mm jack, and a drawstring bag. 30 30-Day Money-Back Guarantee. The 990 soundstage is different than the DT880 250 ohms I own. To me the DT 990 Edition phones sound more like a semi open phone and the 880's an open headphone. Just the opposite as the advertised description although I think it may be due to a factor in design/construction The DT 900 Pro X is true to what a monitoring headphone should be and does not exaggerate the bass, but does take EQ well so bass adjustments in the mix show up quite easily. Advertisement. Scroll to continue reading. There is no perceptible bass bleed; very little added warmth is carried over into the midrange. DT 990 Edition. Hi-fi headphones (open) Circumaural, premium headphones for music enjoyment at home and to go. Distinctive highs, intense bass and excellent spatial reproduction. Optimum wearing comfort, even when enjoying music for several hours. Open design for especially spacious sound, virtually speaker-like. Made in Germany. .

beyerdynamic dt 990 pro 250 ohm review