JC-1's don't lack bass when I've heard them. You can only move so much air with 6 1/2" drivers.
But it sounds like your listening position is in a bass null. Move your seating position and speakers.
I owned a Sim W5 amp and 4070 model and found those lacking in bass with my NHT 3.3 speakers even though the reviewers claimed they were excellent on the bass.
But it sounds like your listening position is in a bass null. Move your seating position and speakers.
I owned a Sim W5 amp and 4070 model and found those lacking in bass with my NHT 3.3 speakers even though the reviewers claimed they were excellent on the bass.