HA8000 Headphone Amp too loud

Contributor - Level 1
Hi, I purchased a HA8000 headphone amplifier and after hooking it up to my Universal Audio HA8000, I find the headphone outputs on the front panel MUCH too loud. Simply put, even a couple notches of the Main volume, plus a couple notches of any of the individual headphone output volumes, results in a much too loud signal. Strangely, the green lights indicating volume/output on the front panel are barely blinking during this... Any help?