In a message dated 4/1/2011 7:31:45 P.M. Eastern Daylight Time, [email protected] writes: >>Also, just a second thought on the speaker impedance...based on my experience in Audio as well as Ham...one should match the impedance of the speaker to the impedance designed into the audio output circuit While this is generally true, be careful. Some years ago an attempt was made to "match" a set of low-Z headphones to the "600 OHM HEADPHONES ONLY" jack on a commercial audio mixing console using a 600-ohm to 4-ohm audio transformer. Unfortunately, while the transformer may have had an AC *IMPEDANCE* of 600 ohms, the *DC RESISTANCE* of the winding was too low and, over time, it burned out the directly-coupled output transistor in the console by forcing it to source too much current to the load. MORAL: Pay attention to the configuration of the driving circuit before you arbitrarily hang something on the output. 73/Paul, K4MSG
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