Amazon with MP4NATION has the Brainwavz AP001 Portable Headphone Amplifier for $27 – $10 off with coupon code 9EDKUG6N at checkout = $17
- OP AMP for powerful and clean volume, with bass enhancer
- Stereo line in and dual stereo line out
- No degradation of low or high frequency response
- Supports 16 ohm – 150 ohm earphone & headphones
- Built in 120 mAh rechargeable battery, provides 12 hours of continuous usage
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Brainwavz AP001 Portable Headphone Amplifier