So the other day I ran my vox cambridge 15 V9159 from a line out into my rumble 40 and i think I liked the sound. I like the gain on the vox a lot and the extra eq and low end from the rumble seemed like a good combo. Is there any technical issue doing this? They are both 8 ohm speakers. I guess I didn't know if that would be hard on the amps or not. I don't quite have an understanding of all the ohms stuff and all that.