We have just posted our review of the Samson QH4 4-Channel Headphone Amplifier. This takes your standard input and outputs it to four separately controlled 1/4-inch headphone jacks. While not everyone needs a four channel amplifier, the price tag of $70 certainly makes it inviting. Take a look at our review for all the details, upsides and downfalls before you spend your money.
For $70, the Samson QH4 should be on the wish list of pretty much anyone who enjoys music, creates content or monitors audio. Expensive headphone amplifiers also modify the sound to create a warmer, richer experience, but the QH4 is simply an amplifier. It does that job very well.