Customer Rating: 
Summary: Do not buy
Comment: This product is simple in design, however somehow it still sucks. I have owned items like this in the past and never had such a time with them. I plugged everything in, and it worked great, untill I moved, and it began to crackle non-stop. Once I adjusted the volume the slightest bit the music went out all together, if it is not on full volume it is muted.
Customer Rating:
Summary: Simple but effective
Comment: If you want a buffer between you and the audio source, get this product. Well made and it will save your hearing.
Customer Rating:
Summary: Very nice volume control
Comment: This Koss is very good one for volume control. There is no noise sound when I adjust volume. I can't distinguish whether I plug my headphone with this Koss because it has no effect to my head phone at all. I use HD555 which has 50 ohms impedance so I think this Koss may reduce some power of my headphone. But not at all. My HD555 still provides great sound. I love it.
Customer Rating:
Summary: Works Fine
Comment: I have one of these between my CarPC and AMP input. The soundcard was putting out to much power, turning the volume up to 10 out of 100 on the PC would almost blow the speakers. This thing was the quick and easy fix to give a little more breathing room to the PC volume. I haven't noticed any sound quality loss though I dont have the nicest of speakers to notice fine detail.
Customer Rating:
Summary: Simple function executed well
Comment: I bought this simply because I was tired of taking my MP3 player out of my pocket to adjust the volume. This has taken care of that and provided some more room for me move without worrying about accidentally unplugging my headphones. Product works great
Pro
- Simplicity of use
- No drop-off in sound quality
Cons
- I wish the volume level could be raised a little bit more for when I really want to crank up the music, but to be fair, that's because I listen to music at a ridiciously high level.
Summary: Do not buy
Comment: This product is simple in design, however somehow it still sucks. I have owned items like this in the past and never had such a time with them. I plugged everything in, and it worked great, untill I moved, and it began to crackle non-stop. Once I adjusted the volume the slightest bit the music went out all together, if it is not on full volume it is muted.
Customer Rating:
Summary: Simple but effective
Comment: If you want a buffer between you and the audio source, get this product. Well made and it will save your hearing.
Customer Rating:
Summary: Very nice volume control
Comment: This Koss is very good one for volume control. There is no noise sound when I adjust volume. I can't distinguish whether I plug my headphone with this Koss because it has no effect to my head phone at all. I use HD555 which has 50 ohms impedance so I think this Koss may reduce some power of my headphone. But not at all. My HD555 still provides great sound. I love it.
Customer Rating:
Summary: Works Fine
Comment: I have one of these between my CarPC and AMP input. The soundcard was putting out to much power, turning the volume up to 10 out of 100 on the PC would almost blow the speakers. This thing was the quick and easy fix to give a little more breathing room to the PC volume. I haven't noticed any sound quality loss though I dont have the nicest of speakers to notice fine detail.
Customer Rating:
Summary: Simple function executed well
Comment: I bought this simply because I was tired of taking my MP3 player out of my pocket to adjust the volume. This has taken care of that and provided some more room for me move without worrying about accidentally unplugging my headphones. Product works great
Pro
- Simplicity of use
- No drop-off in sound quality
Cons
- I wish the volume level could be raised a little bit more for when I really want to crank up the music, but to be fair, that's because I listen to music at a ridiciously high level.