Design:

- Amp1 was designed mainly using AKG K601′s (120ohm) for listening tests, because of this it has a wonderful synergy with AKG even more so the K601/K701/K702 (120/62ohm) Family.
- Further testing was done with Alessandro MS1′s (32ohm), Grado HF-2′s (32ohm), Sennheiser HD650′s (300ohm), PX100′s (32ohm) along with vintage AKG K240 Sextetts (600ohm) and Monitors (600ohm).
- Amp1+HF-2 is a hit or miss combination, sounding better than almost all other headphones on some tracks while leaving you reaching for the skip button on others.
- Has a nice synergy with all other headphones I’ve tried, and from customers using a wide variety of brands and models, some very high efficiency headphones may experience a slight hiss due to the gain required to drive higher impedance/low efficiency headphones. Battery1 is an inexpensive solution that virtually eliminates all noise even when used with the most efficient IEMs.
- Works equally well driving 32ohm through 600ohm headphones and even IEMs when Amp1 is paired with Battery1.
- Designed to integrate into your home or office computer station using a line in from your pc and providing a preamp output to your powered computer speakers, simply plug in your headphones and without swapping cables the speakers are muted and your headphones provide a wonderful listening experience.
- Makes an excellent and affordable upgrade to all internal and external PC/Mac sound cards and usb dacs.
- Works very well with all ipods and mp3 players, for best results use the line output instead of headphone output if available

Features:

- NEW The Amp1 upgrade! Click here for details.
- +/- 12v power supply is compatible with many high end op-amps, Amp1 comes stock with a pair of LME49860 (8 DIP) op-amps, one for the left and right respectively
- Compact desktop design
- Solid aluminum volume knob, in both smooth and knurled finish (both included)
- High and low gain switch to work with most headphones
- 3.5mm input, headphone output, and pre-amp output jacks
- Input capacitor bypass for increased sound quality when not required
- Alps volume pot with integrated on/off switch
- 3 channel active ground architecture
- 24v regulated power supply, can be replaced with a high quality regulated supply or battery pack between 16-24v dc
- High Performance, High Fidelity National Semiconductor op-amps for the left/right channels, (LME49860 Stock), (LME49720HA Upgrade)
- High current National Semiconductor op-amp for isolated headphone ground (LM6171)
- All op-amps are socketed and can be easily replaced or “rolled” by the end user (Tools included to open Amp1)
- Choice of Silver or Black anodized enclosure