I bought this for my iPod because I have high impedence headphones ( 600ohms ). It does the job but isn't overly loud, But when I use my CD player the volume goes right up and there's more than enough volume to spare. I don't know if this is a mismatch or what as I have used other not nearly so powerful headphone amps that have been much louder but rated a lot lower in power. It does seem to be very well built and solid considering the price.