Rating: 
Summary: Once you figure out the quirks they're great
Review: At first I was a little disappointed as I thought the sound had way too much noise - but then I figured out the quirks of the beast and I've been exceptionally satisfied. Tip #1: Crank the volume on the audio source - there is a direct relation between the volume at the source and the strength of the signal being broadcast. With my Sony amp set to around 25 (10 is normal listening volume) I can listen to these anywhere in my house without an issue. Tip #2: play with the tuning wheel. The location on the wheel with the strongest signal is not necessarily the place for the cleanest signal - I've got no idea why but I've noticed that which room I'm in makes a difference as to how the tuning should be set.As said by someone else, these aren't studio, but with that caveat in mind they are great.
Rating:
Summary: recommend even for music lovers!
Review: Excellent product. I bought it because I love music (classical, rock, blues) and also listen to some radio online AND live in a small apartment in New York, so I can't play loud whatever I am listening to. This product will not give you absolutely hi-fi sound you get through regular "wired" headphones (this is why I have a pair of those as well). However, it carries sound nicely and without much static at all. I you love music as much as I do, and you want to listen to it when you are moving around the apartment, doing chores and stuff, you will enjoy this product. piece of advice: DO CHARGE THEM 24 HOURS WHEN FIRST IN USE!!!
Rating:
Summary: recommend even for music lovers!
Review: Excellent product. I bought it because I love music (classical, rock, blues) and also listen to some radio online AND live in a small apartment in New York, so I can't play loud whatever I am listening to. This product will not give you absolutely hi-fi sound you get through regular "wired" headphones (this is why I have a pair of those as well). However, it carries sound nicely and without much static at all. I you love music as much as I do, and you want to listen to it when you are moving around the apartment, doing chores and stuff, you will enjoy this product. piece of advice: DO CHARGE THEM 24 HOURS WHEN FIRST IN USE!!!
Rating: 
Summary: Disgusting
Review: Horrible headphones. Complete static. No bass. I STRONGLY recommend that you NOT buy these. Battery life very low, complete opposite of sound cancelling, with volume all the way up, you can hear it in the other room. If you are looking for wireless headphones, these are not the answer, a complete waste of $80
Rating: 
Summary: Good product spoiled by AGC
Review: I bought these for listening to classical music late at night without disturbing my apartment neighbors. I use a computer to play all my music, and hate being tied to my workstation while listening by a cord, so I was willing to compromise on audio quality for the sake of wireless convenience. In fact I was pleasantly suprised by the sound, which is rich and full, and not at all lacking in bass. Range is adequate for my small apartment, and interference noise has not been any problem for me.
But, there is one problem which makes them almost useless; they have Automatic Gain Control (AGC), which compresses the dynamic range of the output. To explain a little -- popular songs are recorded at a near-constant level, so setting the output amplification automatically to give a constant average signal is not noticeable, but most classical music varies very widely in audio level. A big orchestral climax, with every instrument going full blast, might be followed by a solo flute playing very quietly. Or, a long diminuendo in a piano sonata might fade to a brief silence, and then, for dramatic effect, comes a big fortissimo chord. What happens here is that the volume automatically cranks up during the diminuendo keeping it almost as loud as the loudest of passages, then I hear hiss during the silence, as the gain is too high, and then the loud chord that follows is momentarily deafeningly distorted, and then very quickly the AGC cuts down the volume to be about the same as the overly amplified preceding very quiet passage. This largely ruins the music for me.
If I could only turn the AGC off, these headphones would be fine for me, but it is not even mentioned anywhere in the tech specs nor in the user manual.
I believe in fact all wireless headphones have this feature, although it is seldom mentioned. I now wish I had bought the AKG brand, because I found in their user forums a hack to disable the AGC on the transmitter unit, although this requires soldering on the circuit board. Unfortunately Sennheiser does not seem to have forums, so I guess I'm out of luck with these.
Rating:
Summary: Good product spoiled by AGC
Review: I bought these for listening to classical music late at night without disturbing my apartment neighbors. I use a computer to play all my music, and hate being tied to my workstation while listening by a cord, so I was willing to compromise on audio quality for the sake of wireless convenience. In fact I was pleasantly suprised by the sound, which is rich and full, and not at all lacking in bass. Range is adequate for my small apartment, and interference noise has not been any problem for me.
But, there is one problem which makes them almost useless; they have Automatic Gain Control (AGC), which compresses the dynamic range of the output. To explain a little -- popular songs are recorded at a near-constant level, so setting the output amplification automatically to give a constant average signal is not noticeable, but most classical music varies very widely in audio level. A big orchestral climax, with every instrument going full blast, might be followed by a solo flute playing very quietly. Or, a long diminuendo in a piano sonata might fade to a brief silence, and then, for dramatic effect, comes a big fortissimo chord. What happens here is that the volume automatically cranks up during the diminuendo keeping it almost as loud as the loudest of passages, then I hear hiss during the silence, as the gain is too high, and then the loud chord that follows is momentarily deafeningly distorted, and then very quickly the AGC cuts down the volume to be about the same as the overly amplified preceding very quiet passage. This largely ruins the music for me.
If I could only turn the AGC off, these headphones would be fine for me, but it is not even mentioned anywhere in the tech specs nor in the user manual.
I believe in fact all wireless headphones have this feature, although it is seldom mentioned. I now wish I had bought the AKG brand, because I found in their user forums a hack to disable the AGC on the transmitter unit, although this requires soldering on the circuit board. Unfortunately Sennheiser does not seem to have forums, so I guess I'm out of luck with these.
Rating:
Summary: SF Reviewer is Mistaken
Review: I don't know what the guy from San Francisco did, but he is mistaken about the Sennheiser RS40's. They are a great wireless headphone. I get great sound throughout my home (even through walls). They are light and easy to use. I think SF just hooked them up wrong. These headphones are very very good. Try them if you're interested in good sound and light weight.
Rating:
Summary: Great Value
Review: I have tried a lot of wireless headphones. These sound as good as any and are more comfortable than most. They are light, have a nice balanced range with more bass than I expected with open air headphones. I haven't tested the extreme range, but they reach across my backyard. What more do I need? You can pay more and get more features. If I want really hi-fi, I have studio phones, but for listening to tunes or books on tape while I do yardwork I couldn't ask for more.
Rating:
Summary: Great buy for the price
Review: I haven't tried going beyond about 100 feet but the reception has been great. I think the sound is exceptional. It is easy to set up and to use. The on-headset tuning is easy and stays adjusted. The automatic battery charging when the headset is placed in the holder is a real plus. My only minor complaint is that the volume control and tuning wheels are close together and it is fairly easy to move the wrong one.
Rating:
Summary: Not For Office Use!!
Review: I needed a good set of headphones for some of the work that I do. I thought that by the information presented in the write up about this product that I was purchasing a good, or even great, addition to my office. NO GOOD! If you have typical office construction, that is metal studs in walls, metal ceiling grids holding up tiles and lights, and other typical office furniture this product will not make you happy! Bad info advertisement related to this product.
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