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A few people have asked me to post a comparison between these two headphones once I got the Pro 900's, so here goes. Keep in mind, I just got the Pro 900's delivered not even an hour ago, so these are only initial impressions and the heaphones have not had a chance to burn in. I'll post updated impressions once they have. The DT770's have been burned in. Both headphones are being tested on a Zune HD > Oyaide HPC-LL > Fiio E12 setup with no bass boost or equalization.
Initial Build Quality/Packaging Impressions:
The Pro 900's clearly come with better packaging. They arrive in a nice semi-soft zippered case with spare earpads, two cables, and instructions with a CD. Contrary to what they've written in some places, there is no 3.5mm to 1/4" adapter; rather, the coiled cable terminates in a quarter inch plug and the straight cable terminates in a mini plug. The DT770's just come in a cardboard box with a screw on adapter. The Pro 900's have a removable cable that screws in, which I really like. The provided mini cable is also much shorter than the DT770's cable, which is a little unwieldy for portable use.
Note the deeper earcups on the DT770's.
The headband and cups on the Pro 900's are made of rubberized plastic that feels good to the touch, but I'm not sure about its longevity compared to harder plastics. The yokes are made of a semi matte hard plastic that looks and feels kind of cheap. The DT770's yokes make an annoying popping sound every once in a while if they move while they're on your head; the Pro 900 doesn't do this, but the plastic creaks a little. The metal plates on the Pro 900's look much better in person than they do in the photos. The raised logo has some lines on it that look horizontal, but are actually gently curved (made using some kind of rotary tool, which would be easier). The clicks on the headband adjustment are more secure on the DT770's; the ones on the Pro 900's move around pretty easily. The DT770's are much more comfortable; the cups are bigger, the headband is padded over the whole thing instead of just a little part on the top, and the clamp is lower. The Pro 900's fold into a ball, but it's not as tight in real life as they show in the promo pics. Fortunately, it does not seem like the metal plates can scratch each other when folded like this. The DT770's are made in Germany, whereas the Pro 900's are made in Taiwan. Overall, I'd say that the Pro 900's have a build that suggests a more premium headphone, but I think the DT770's would be more durable, and I really like their utilitarian functionalism.
The Pro 900's have cups that fold up.
Sound Initial Impressions:
The Pro 900's have quite a bit more bass than the DT770's, both mid-bass and sub-bass. I'm actually not a bass head; I just like to have a variety of sound signatures to suit my mood. The Pro 900's would be much more satisfying to a bass head, I think. And as far as bass heavy headphones go, I think they do an excellent job at being both bassy and sounding good. The bass is very engaging and has nice texture, but doesn't completely ruin the rest of the spectrum. If I want to hear accurate, though, I'll turn to a different headphone in my stable. The 900's also sound quite a bit more forward compared to the more laid back DT770's. The DT770's also have a larger and more natural soundstage. The soundstage on the Pro 900's puts the bassy instruments right next to your ear, but the higher pitched instruments like drums sound like they're further away. I don't think this is just because the bass is emphasized; I think the soundstage is just oddly imaged. I don't think the Pro 900's are extremely sibilant (at least they aren't the worst I've heard). I do find their treble to be a little unrefined and artificial, however. Cymbals are present, but don't sound realistic. Rock recordings sound slightly distorted, but electronic recordings are more engaging than on the DT770's. The Pro 900's are at least as resolving and detailed as the DT770's. I'll have to compare the two after the 900's have burned in, though, since the treble does improve with burn in according to other users.
The 770's have a durable sheet metal headband and user replaceable padding.
Overall, I'm enjoying the Pro 900's. I believe part of the reason why they have been so hit and miss for many people is due to the price. Until very recently, the street price for these was not that much lower than the list price. At that price I don't feel they are worth it; the Sennheiser HD650's are better in that price bracket (very different headphones, I know, but it's hard to deny that they're better). Recently, though, they have been available at Amazon for under $300, and I got mine for under $220 with tax from one of their lightning deals. At those prices, the Pro 900's are much more competitive and stand a good chance at gaining a new following. As for how they stack up against the DT770's, I like both headphones. I think the DT770's would be more appealing to an audiophile looking for accuracy and realism, whereas the Pro 900's are better for a bass head or someone looking for a more fun sound signature.
Earcup size comparison.
Initial Build Quality/Packaging Impressions:
The Pro 900's clearly come with better packaging. They arrive in a nice semi-soft zippered case with spare earpads, two cables, and instructions with a CD. Contrary to what they've written in some places, there is no 3.5mm to 1/4" adapter; rather, the coiled cable terminates in a quarter inch plug and the straight cable terminates in a mini plug. The DT770's just come in a cardboard box with a screw on adapter. The Pro 900's have a removable cable that screws in, which I really like. The provided mini cable is also much shorter than the DT770's cable, which is a little unwieldy for portable use.
Note the deeper earcups on the DT770's.
The headband and cups on the Pro 900's are made of rubberized plastic that feels good to the touch, but I'm not sure about its longevity compared to harder plastics. The yokes are made of a semi matte hard plastic that looks and feels kind of cheap. The DT770's yokes make an annoying popping sound every once in a while if they move while they're on your head; the Pro 900 doesn't do this, but the plastic creaks a little. The metal plates on the Pro 900's look much better in person than they do in the photos. The raised logo has some lines on it that look horizontal, but are actually gently curved (made using some kind of rotary tool, which would be easier). The clicks on the headband adjustment are more secure on the DT770's; the ones on the Pro 900's move around pretty easily. The DT770's are much more comfortable; the cups are bigger, the headband is padded over the whole thing instead of just a little part on the top, and the clamp is lower. The Pro 900's fold into a ball, but it's not as tight in real life as they show in the promo pics. Fortunately, it does not seem like the metal plates can scratch each other when folded like this. The DT770's are made in Germany, whereas the Pro 900's are made in Taiwan. Overall, I'd say that the Pro 900's have a build that suggests a more premium headphone, but I think the DT770's would be more durable, and I really like their utilitarian functionalism.
The Pro 900's have cups that fold up.
Sound Initial Impressions:
The Pro 900's have quite a bit more bass than the DT770's, both mid-bass and sub-bass. I'm actually not a bass head; I just like to have a variety of sound signatures to suit my mood. The Pro 900's would be much more satisfying to a bass head, I think. And as far as bass heavy headphones go, I think they do an excellent job at being both bassy and sounding good. The bass is very engaging and has nice texture, but doesn't completely ruin the rest of the spectrum. If I want to hear accurate, though, I'll turn to a different headphone in my stable. The 900's also sound quite a bit more forward compared to the more laid back DT770's. The DT770's also have a larger and more natural soundstage. The soundstage on the Pro 900's puts the bassy instruments right next to your ear, but the higher pitched instruments like drums sound like they're further away. I don't think this is just because the bass is emphasized; I think the soundstage is just oddly imaged. I don't think the Pro 900's are extremely sibilant (at least they aren't the worst I've heard). I do find their treble to be a little unrefined and artificial, however. Cymbals are present, but don't sound realistic. Rock recordings sound slightly distorted, but electronic recordings are more engaging than on the DT770's. The Pro 900's are at least as resolving and detailed as the DT770's. I'll have to compare the two after the 900's have burned in, though, since the treble does improve with burn in according to other users.
The 770's have a durable sheet metal headband and user replaceable padding.
Overall, I'm enjoying the Pro 900's. I believe part of the reason why they have been so hit and miss for many people is due to the price. Until very recently, the street price for these was not that much lower than the list price. At that price I don't feel they are worth it; the Sennheiser HD650's are better in that price bracket (very different headphones, I know, but it's hard to deny that they're better). Recently, though, they have been available at Amazon for under $300, and I got mine for under $220 with tax from one of their lightning deals. At those prices, the Pro 900's are much more competitive and stand a good chance at gaining a new following. As for how they stack up against the DT770's, I like both headphones. I think the DT770's would be more appealing to an audiophile looking for accuracy and realism, whereas the Pro 900's are better for a bass head or someone looking for a more fun sound signature.
Earcup size comparison.