Apex Jr now has the Apex Sr. plate amps in stock already modded.
http://www.apexjr.com/Apexsenior.htmR-26 is a 18K resistor by changing to a 47K you'll get a corner freq of 18Hz with a 2Db boost at 21-22Hz.
When using this amp with our SW-12A and PR-12A combo it gets you to 20Hz at only 1db down. It's a perfect combo.
