Phil Jones Bass introduced the Bighead Pro (Model HA-2), a high-performance, multi-function headphone amplifier/digital audio interface. The HA-2 is a high-resolution USB audio interface that supports PCM playback with up to 384kHz sample rate/24-bit resolution. On DSD playback, sample rates of 2.822mHz and 5.644mHz are supported, making it the ideal choice for musicians and engineers that desire high performance and the purest sound quality, stated the company. It is a rechargeable lithium ion dynamo for use in practice or recording situations. It also functions as a headphone booster amp as well as a preamp to drive powered amplifiers. The HA-2 has both passive and active instrument inputs with a two-band EQ for guitar and bass, yet it is versatile enough for use with other instruments.