One more point about trying the 4 ohm taps. It can be expected that you'll have to turn the volume control up a bit higher than you would when using the 8 ohm taps, to achieve the same volume. If the volume control is considered as if it were the face of a clock, the difference will probably be in the vicinity of an hour or so.
Good luck. Regards,
-- Al
Good luck. Regards,
-- Al