Samson S-Phone Professional Headphone Mixer Amplifier - Studio Recording, Podcasting & Live Performance Audio Equipment

I needed to boost the output of my combo Android mp3 player and Yamaha drum set as well as try to get the maximum from some Senheiser 650s - both in volume and frequency response without distortion. I tried a $50 ART HeadAmp4 Four Channel Headphone Amplifier. Got bass distortion never heard with the unamped system before. Decided to sink some real $$ into the project (but really $170 isn't high for an amp with equalizers, that can also handle 12 sets of headphones). This thing is a Gift from the Gods. Some reviewers say you can't get good sound quality from mp3-s and you have to convert your whole music library to lossless. Bull. I'll say it again - that's NOT TRUE.Although I admit I'm using a very good Android tablet-based mp3 with excellent sound Crystallizer and Expander, I am hearing music and my drums like never before. The sound is RIGHT. I hear lyrics and lead guitar licks in songs I never heard before.Using the Senheiser 650s doesn't hurt (trying this system with (burned in) AKG Q 701 Quincy Jones Signature Reference-Class Headphones ($250) was far less sonically precise and deep - but the center of this system, the Samson S Phone 4 Channel Headphone Amplifier 12 Outputs is a miracle. I would pay double for what it gives me in 1: Volume range, 2: Bass depth and control, and 3: Treble - pristine treble. I now hear one of my Yamahama crash cymbals that previously was completely negligible. My ride sounds crisp and clear. My snare is right in front, where I want it, and the bass and tom toms resonate with tremendous deep tones. I now hear my full drum set AND hear the source music like never before.I can drive this headphone amp in volume or bass or treble to extremes that would hurt my ears and distort the music. I barely use 15% of its adjustment capacity. But for some older CDs converted to mp3s, the range is there to get the sound just right.If you're a drummer and looking to really hear what the manuf produced, you must get a decent headphone amp. The Samson S Phone 4 Channel Headphone Amplifier 12 Outputs is a BMW. I now look forward to and get into my practice sessions like a crazy young kid.Obviously I can't say enough about the Samson S Phone 4 Channel Headphone Amplifier 12 Outputs. It has changed my world. I DARE any other headphone amp priced under $400 to try to touch it.BTW - do it right and use a first class TRS cable to connect to the amp: Premier Series 1/4inch (TRS or Stereo Phono)Male to Male 16AWG Cable - Gold Plated - 6ft ($7)