Customer Rating: 
Summary: Works fine - good for the money
Comment: This product does what it is supposed to do. I've occasionally noticed that the connection isn't perfect, but mine's been banged around a lot and dragged on the floor of my study. I've always been able to get rid of any connection problems by just ensuring that the my phones are plugged in tight. This product comes in handy.
Customer Rating:
Summary: I LOVE IT
Comment: I purchased this volume control simply to give my headphones an extension cord. Being able to adjust the volume is an added bonus.
Customer Rating:
Summary: Does the Job
Comment: My mid-eighties Pioneer CD player -- now used as a bedside player -- has proved to be a better sounding and more reliable machine than a series of inferior-built portables. The only problem with the Pioneer is that there is no volume control for the headphone input, and with a sensitive pair of cans (Grado SR80s) way too loud.
The Koss VC20 Volume Control performs as advertised. It's a simple, lightweight volume attenuator that brings down the volume to a bearable listening level. Please note that it's not an amplifier, which means it's great for dialing down the volume, but is not going to amplify a weak signal. One reviewer here complained that the high-end was degraded as the control decreased the volume. Not so in my experience. It's natural for the high-end to lose some brightness as volume decreases, and is especially a problem for old ears that are losing their ability to hear higher frequencies as decibel level decreases. It sounds fine to me.
This little Koss volume control is a cheap and effective device. After a few months, I'm still satisfied with the purchase.
Customer Rating:
Summary: Koss VC20 Volume Control
Comment: The Koss VC20 Volume Control works very well with the Audio-Technica ATH-ANC7 QuietPoint Active Noise-Cancelling Headphones. Great combination.....
Customer Rating:
Summary: Convenient but pricey
Comment: I just needed an extension cable for my Sony headphones that had very short wire length (they connect to my cell phone's hands free cable and that's why they have been made that way), but most of the extensions available are at least 3ft in length. This Koss VC20 was perfect and I also got the added convenience of a volume control. However, at $8.99 (what I paid at the time) they are pricey for what they do. These days you can pretty much buy a cassette/CD walkman for that price!
Nevertheless, I am happy with my purchase.
Summary: Works fine - good for the money
Comment: This product does what it is supposed to do. I've occasionally noticed that the connection isn't perfect, but mine's been banged around a lot and dragged on the floor of my study. I've always been able to get rid of any connection problems by just ensuring that the my phones are plugged in tight. This product comes in handy.
Customer Rating:
Summary: I LOVE IT
Comment: I purchased this volume control simply to give my headphones an extension cord. Being able to adjust the volume is an added bonus.
Customer Rating:
Summary: Does the Job
Comment: My mid-eighties Pioneer CD player -- now used as a bedside player -- has proved to be a better sounding and more reliable machine than a series of inferior-built portables. The only problem with the Pioneer is that there is no volume control for the headphone input, and with a sensitive pair of cans (Grado SR80s) way too loud.
The Koss VC20 Volume Control performs as advertised. It's a simple, lightweight volume attenuator that brings down the volume to a bearable listening level. Please note that it's not an amplifier, which means it's great for dialing down the volume, but is not going to amplify a weak signal. One reviewer here complained that the high-end was degraded as the control decreased the volume. Not so in my experience. It's natural for the high-end to lose some brightness as volume decreases, and is especially a problem for old ears that are losing their ability to hear higher frequencies as decibel level decreases. It sounds fine to me.
This little Koss volume control is a cheap and effective device. After a few months, I'm still satisfied with the purchase.
Customer Rating:
Summary: Koss VC20 Volume Control
Comment: The Koss VC20 Volume Control works very well with the Audio-Technica ATH-ANC7 QuietPoint Active Noise-Cancelling Headphones. Great combination.....
Customer Rating:
Summary: Convenient but pricey
Comment: I just needed an extension cable for my Sony headphones that had very short wire length (they connect to my cell phone's hands free cable and that's why they have been made that way), but most of the extensions available are at least 3ft in length. This Koss VC20 was perfect and I also got the added convenience of a volume control. However, at $8.99 (what I paid at the time) they are pricey for what they do. These days you can pretty much buy a cassette/CD walkman for that price!
Nevertheless, I am happy with my purchase.