10-18-2020, 02:24 PM
You may be supplying LESS juice to the speaker. If the original was 2 ohms, for example, the OT is supplying lower voltage at a higher current. An 8 ohm speaker needs higher voltage to generate sufficient current through the voice coil to give the same power. The speaker "absorbs" less power from the OT. Thus, lower volume. Just a thought!