official product page - "PGA-05 Stereo Single Rack Mount Active D.I. designed to work with pre-amp's and head/combo amps. This unit has no load box, therefore speakers must be connected when used with tube amplifiers. The PGA-05 also features an extensive filter section much like the PGA-04. $665"
Amptone.com ultra gear-search page
Home (amp tone and effects placement)