Here is the manual for the HPA 2 , but not sure if this helps you or not ?
http://www.proceedaudio.com/manuals/HPA2manual.pdf
Is there a different model that you are looking for other than the HPA 2 ?
http://www.proceedaudio.com/manuals/HPA2manual.pdf
Is there a different model that you are looking for other than the HPA 2 ?