>From memory, (ie the regs changed I should check first) over here in Eu we have working place regulation set at 85dBA as a maximum for continuous 8 hours listening environment, but it is advised (not mandatory till another 3dB) to use some kind of ear protection; then 88dBA for 4 hours, 91dBA for 2 hours, etc and there is a maximum somewhere around 90s duration. I think *most* folk would find 85dBA very tiresome over 8 hours. I think what I'm saying is that the K3 output is more than adequate and if it isn't for someone, then headphones would be better so as not to waken the family / neighbourhood. 73 and season's greetings David G3UNA > > The loudspeaker output stages in the K3 are sufficient to drive an > external passive (unamplified) loudspeaker of reasonable efficiency to a > more than enough level for those who aren't seriously hearing impaired. > A number to look for in loudspeaker specs is 85dBSPL or more for 1 > watt at one meter into 8 ohms. Most of us would set a loudspeaker > within 20 inches or so, which increases the level by 6dB, and, as I > recall, the K3 has a 1 watt output stage. That puts a peak loudness of > 91 dB in our ear for CW, and about 10dB less for SSB. > > 73, Jim Brown K9YC
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