So I am pretty sold on keeping my Berg NV215 but I want to add some highs.
I ran it before with a biamp GK800RB, which has a separate tweeter amp.
Experimenting, for 10 minutes, I ran another 215 (4ohm) cab with my Sun 2000S off the optional 4 ohm tap instead of the 16 (The brown wire that comes from the OT), then I plugged a medium size Klipsch center channel speaker (2x4"+horn) (8ohms) out of the 215's cab parallel jacks.
The sound was very balanced between the 2 cabs. Since the Klipsch rolls off high, there was no distortion. Just more presence.
A lot of 4 ohm cabs have tweeter/mid/ etc speakers included in them (Including the Berg has a 6"), so that makes me wonder if it really changes the total impedance of the total load.
Is it safe to run this cab on a tube amp this way, namely in my Mesa 400+?