You don’t really need an amplifier to drive the Momentum with, it plays well right out of an Ipod or out of my Altmann Tera (with its relatively weak headphone out). I did try using it with some amps, including the mighty Burson Soloist with a hope to improve the bass impact or control, but didn’t really get any significant improvement. Sound was bigger and grander out of a good desktop set up, that’s for sure. But bass, I’m still not feeling the PRaT.
If you want something that resembles the warmth of the Momentum but with better PRaT, you can get the Amperior. It’s a warmer version of the HD25-1, though again bass speed and PRaT is probably a 7 where the HD25-1 is a 9. At the other end of the scale, full of PRaT and little warmth is the long time favorite HD25-1.
Being warm and full sounding may sound like a typical Sennheiser, but listening to the absolutely grainless and clean sound, I’m assured that this headphone is equipped with the latest generation driver from Sennheiser. Even the HD800 still has grain in the sound, so you definitely won’t be comparing the Momentum’s driver to the HD600/650 class or even the HD558/598. It’s a lot like the HD700 in the sense that’s it’s very clean, though the background is not as black as the HD700’s. Of course this is not reference class like the HD600/650/700/800, so please don’t get the wrong idea. I was just praising the clean grainless sound of the Momentum, since Sennheisers usually come with grainy drivers. The bottom line is that the technicalities are good for a lifestyle headphone: you get the soundstage, you get a clean grainless sound, and detail level is good, but that’s about it.
I have mixed feelings with the Momentum. As I’ve said: this is a headphone that knows very well what it was designed to do and to whom its creators wanted to sell it to.I don’t think Sennheiser or anybody else could’ve done a better job at designing a classy lifestyle headphone for the mainstream crowd. From the first moment I put it on, the fit the comfort to the sound it was all very nice. The sound, despite the shortcomings in the bass, I think is perfectly tuned for the mainstream crowd. I don’t think it’s the headphone for me though. The HD25-1 may have had a much older, less refined driver, but I love its PRaT and the tight fast bass. The TMA-1 which people find to be uncompatible with almost every recording out there, is still a much better headphone for club music. If that may sounds like a turn-off, let me say again that the Momentum is currently the best lifestyle headphone I’ve listened to, and I’m not even counting the styling points. I just find it to be too soft, to relaxed for me, but that’s the beauty about headphones: it’s never about finding the ultimate headphone. Rather, finding what’s right for you and your music.