Rating: 
Summary: Not Bad
Review: At this price, you should not expect a studio quality piece, but these phones are feather light and offer adequate sound quality.I use them to listen to the radio through my PC while at work, and they are doing a good job at it.
Rating:
Summary: Great sound.
Review: Excellent sound for portable headphones. Great range, high and low frequencies. The only drawback, the reason I didn't give them a five star product rating, is because the rubber at the top of the headband doesn't seem to be enough to keep them on your (my) head if I happen to bend over while wearing them. Technically? These are great headphones, and I would recommend them to anyone who has discerning ear for their music. (Just becareful when you bend over ;-)
Rating:
Summary: Great sound.
Review: Excellent sound for portable headphones. Great range, high and low frequencies. The only drawback, the reason I didn't give them a five star product rating, is because the rubber at the top of the headband doesn't seem to be enough to keep them on your (my) head if I happen to bend over while wearing them. Technically? These are great headphones, and I would recommend them to anyone who has discerning ear for their music. (Just becareful when you bend over ;-)
Rating:
Summary: Good portables
Review: I do not actually own the HD56. The model that I do own is the little brother of the Sennheiser Headphone family, the HD26. However, Amazon do not stock this headphone, so I have decided to review this one since it is the most similar. I actually own three Sennheiser headphones; the HD26, HD433 and the HD570. This was the first good headphones I had. They are exceptionally good portables and are perfect for the portable HiFi enthusiest. I will add however, that they are by far not the best headphones Sennheiser have ever made. Quite the contrary; you can get far better headphones made by this company. Anyone who knows anything about Sennheiser would know that the 500 series, 600 series and the Orpheus are the best peahphones available, and I would suggest getting the HD570 if you are want headphones that are exceptional but good value, and the HD600 if you want the best. However these models are not for portables. If you are looking for something more practical, I would recommend that you purchase some any of the 400 series headphones over this one, but if you are looking for a bargain price entry level headphone, this is the one for you.
Rating: 
Summary: Disappointing
Review: I had a pair of Sennheisers back in the 70's which were outstanding. So, when I needed to get some headphones to upgrade my old Walkman headphones, I assumed Sennheisers would be a sure bet. How wrong I was. While the bass was an improvement over my old phones, the mids and highs were a big disappointment, sounding muted, cloudy and just plain bad. The other sad news is that they aren't very comfortable. They squeeze my ears with a little too much force. I actually prefer using the ...headphones that came with the Walkman because at least the highs can be heard and they are comfortable to wear. Alas, my quest for lightweight, slim headphones with great sound continues...
Rating:
Summary: Disappointing
Review: I had a pair of Sennheisers back in the 70's which were outstanding. So, when I needed to get some headphones to upgrade my old Walkman headphones, I assumed Sennheisers would be a sure bet. How wrong I was. While the bass was an improvement over my old phones, the mids and highs were a big disappointment, sounding muted, cloudy and just plain bad. The other sad news is that they aren't very comfortable. They squeeze my ears with a little too much force. I actually prefer using the ...headphones that came with the Walkman because at least the highs can be heard and they are comfortable to wear. Alas, my quest for lightweight, slim headphones with great sound continues...
Rating:
Summary: Pretty good
Review: I think they are good . they have great sound
Rating:
Summary: Smooth sound
Review: I use the headphones with my Frontier Labs MP3 player while I'm working out at the gym. I've used the original headphones that came with the player as well as other headphones from Sony and Aiwa. The Sennheisers are by far the best and smoothest sounding ones and the bass is very strong and controlled. Given the size and price of the phones, I feel that they are an excellent value.
Rating:
Summary: Smooth sound
Review: I use the headphones with my Frontier Labs MP3 player while I'm working out at the gym. I've used the original headphones that came with the player as well as other headphones from Sony and Aiwa. The Sennheisers are by far the best and smoothest sounding ones and the bass is very strong and controlled. Given the size and price of the phones, I feel that they are an excellent value.
Rating: 
Summary: Very Disappointing
Review: I'm seriously considering returning my HD56 headphones. I bought these headphones for doing yardwork to replace my intra-aural folding Sony headphones. I wanted something with a little more bass and more isolation from lawnmower and grasstrimmer engines. These headphones don't fill the bill at all. First of all, the first thing I noticed was a lack of sensitivity. I had to crank up the volume to 10 on both my CD and Cassette Walkmans in order to any decent volume. Even then it was too weak. My other Sony intra-aurals (MDR-A12) were good to go at 7 or 8. The sensitivity is rated at 100 db, but they sound more like 96 or 97 db. If you want to use these for the average underpowered portable, you will be sorely disappointed. Secondly, the sound. These headphones have a lot of bass, but what bass there is is mushy and undefined. You can't tell the difference between Phil Lesh's bass guitar and Bill Kreutzmann's bass drum. The midranges are noticably depressed and the highs are muted. In order to play these half-decently, you will have to set an equalizer to attentuate the 120 hz range by at least 6 db, increase the 1-2 khz range by 3 khz and the 16 khz range by 3 to 5 db. At best, these headphones may be only good for plugging into the CD drive of a computer, but only if you musical tastes tend toward bassy low-fi music and you have plenty of output power.
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