I managed to audition the SRH1840, I wouldn't call them dull, more like...restrained. They don't blow you away on either side of the spectrum, they just do their job without flair. The DT1990 have sizzling highs and a buttery smooth low, the highs might be even called wild. But I prefer to tame the highs than to add where it's not possible, if I want more out of the DT1990 I can remove the EQ and have all their sparkle, with the SRH1840 that's all your going to get; wich is nothing to scoff at. Also, bear in mind the price point. Another thing I prefer about the DT1990 over the SRH1840, is the build. The Beyers have a heft that I just love, they ooze quality, pick them up and without being an afficionado, you know you're picking up something high end; or at the very least, of a higher "breed." The first time I picked up the STH1840, I felt they were...flimsy, not light, flimsy. I was like: "Wow, they expect me to pay 500 USD for this?" Do not be confused, the SRH1840 have a respectable build, but I was expecting more for what they are asking for. One thing the SRH1840 have over the the DT1990: factory ready balanced connection. Just get the cable, no need to jury rig the SRH1840 to make them balanced, good luck doing that with the DT1990. You may not think balanced cables do anything for the sound, but...I was wrong. After years of using my SRH535 unbalanced and then going balanced, I was blown away. I rediscovered my headphones, these little things have never sound this good. I'm still wrapping my head around what happened. So that's that, if you want hazzle free, balancend transition, go SRH1840. Want better build and overall sound performance? go DT1990.