Very interesting amp! I see it is a export model from the photo on the back that shows the speaker outputs and voltage requirements. You have what we call the Big K model.

My advise was based on the model previous to yours was labeled the same lVB and had two two channels, a 7 band graphic EQ, and two 130 watt rms power amps housed in the chassis and you had to use two speaker cables to the 4x12 speaker cabinet so each pair of speakers were driven by each internal amp. (think of it as a stereo amp that runs as a mono amp.)

Your model has two 1/4" speaker outs and what we would call XLR jacks. I am looking at my literature on your amp, and it states 300 watts RMS into 4 ohms. From your photo's it appears to be one power amp. The catalog shows your amp is sitting on a 2x15 cabinet. My literature does not show your cabinet. If your speakers are 16 ohms and wired in series, you would have a 4 ohm cabinet and there would be no need to add a second cabinet.

I left selling Kustoms in late 1979 and your cabinet may have came out after I left the music store.
The blank metal plate on the front panel was a cover plate that you could buy two options and plug into the amp. A 5 band rotary EQ and a patch panel to insert effects and choose what channel you wanted the effects to run to.

As far as any amp. If the amps states 200 watts into a 4 ohm load, if you have a 8 ohm load, the amp will not produce the stated 200 watts.

pleat