> Yes, it works OK, but I would like to match them better.
Don't bother. There is no benefit in doing so. Modern audio amplifiers are essentially zero impedance sources (current drivers). The K2's 4 Ohm specification is based on the audio power output for a given power supply voltage and distortion level. The LM-380 data sheet shows 2W at 12V with 3% distortion for a 4 Ohm load. Move to 8 Ohms and you will get about 1.2W at 12V with 3% distortion. If you want more power output into an 8 Ohms speaker, increase the voltage to the LM-380 to 20V (yes, it's rated all the way to 22V max). If you don't want to modify the radio to supply 20V to the audio amplifier (not a good idea <G>), you rally need to find a high efficiency 4 Ohm speaker or use an external amplifier to get more sound. 73, ... Joe, W4TV On 5/2/2016 4:15 PM, Eddy Avila wrote:
My K2 audio output is 4-ohms which I drive into an 8-ohm ICOM speaker with filters. Yes, it works OK, but I would like to match them better. In the "olden" days I would simply use a 4-ohm to 8-ohm audio transformer, but I can't find them anymore! Really, I've looked at all the suspect places, including eBay and Amazon. Any suggestions, I just want and easy, simple way to matching the two impedance's without losing power which would happen if I used a resister across the ICOM speaker. I know I can just drive a small audio amp between them, but that means more wires to power up the amp...... Thanks to all 73 ed
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