PLEASE NOTE - THIS LISTING IS FOR A BPA2 AMP NOT HPA2, SORRY . . . we do have an HPA3 listed separately.
These are Proceed (Madrigal) pure discreet mono amps capable of delivering 125W in 8ohms - that's about all you need to know.
You can read the user manual here - http://www.proceedaudio.com/manuals/BPA.pdf
The unit is available to view in Mountain View from 11am-7pm, Monday-Saturday. Add 3% for PayPal. Please note that California residents will be have to pay sales tax.