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OTL, Output Transformerless Amplifier User Group.

omni directional speakers always measure less than their real efficiency.

This is because the microphone, place at one meter, simply does not pick up all the information leaving the speaker diaphragm.

It bounces around in the room though. Speakers like this need to have room from the wall behind them and the side so early reflections don't get interpreted has harshness.

In general once you are back a bit from the driver, they act as if they are about 5-6dB more efficient.

The concern I would have with them is that of any 'full range' driver, which is to say that they are never full range and Doppler Effect is well known to increase their distortion.


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