Great sound if slightly quiet!,
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These headphones are very good. I'm no audiophile but to me, the sound quality is excellent. Coming up from the ear buds which came with my Samsung S3, the HD449s are a huge step-up in quality. However, they're also a huge step in price, so are they worth investing in?
As mentioned, these will sound fantastic to anyone who isn't a connoisseur of the highest-end equipment. As they say: the trebles are treb-ly and the basses are bass-ey. The closed cup design will probably have an adverse affect on the acoustics, but for many of us who enjoy listening to music in public places, a closed back design is a must if you don't want to annoy people around you.
The build quality is just OK. The HD449 is an all-plastic design, and the plastic its self is nothing special. This is fine, although for £70 one worries about the consequences of dropping these headphones on the floor! The ear cups have that jelly in them which makes endurance listening easy and comfortable.
I wouldn't get too hung up on the technical side, but it's worth noting the input impedance of 32 Ohms. For those who don't know, 32 Ohms is on the higher side of very low impedance headphones. This means that the HD449s should come though nice and loud on posh hi-fi amps which have enough power to keep you warm in winter. However, if you plan to use these on battery-powered devices such as phones or MP3s you may find that the HD449s come through a little weak. Turning the volume to maximum on my S3 and these are slightly quieter than the original Samsung ear buds, with a very small amount of distortion over the top. This isn't a deal breaker- they are still superior to the buds, although this is probably my main reason for knocking a star off since Sennheiser's advertising for these is aimed at people with MP3 players!
If you've already set aside the £70, you will be very happy with these headphones.