On Fri, October 2, 2015 12:10 pm, Doug wrote: > You didn't mention that you want to add _speakers_. You might need a > small amplifier after the Y-adapter, since the speakers will be low > impedance--4- or 8 ohms. Visit ramseykits.com and find some small audio > amplifiers in kit or assembled form. They are probably overkill for your > purpose, but cheap enough. A 14W stereo kit, CK154, will run on 12 to 16 > VDC at 1A. $26 for a kit, or $34 assembled. You > provide an enclosure and a wall-wart to drive it. (The "14W" rating is for > 7W per > channel, and I would expect that it's a peak rating, since 16V at 1A is 16 > Watts > _input_ power! I would guess that rms power is more like 2 or 3 Watts per > channel.)
In this context, mis-use of terms "impedance" and "power" is adding nothing but confusion. A pair of powered desktop speakers designed to plug into the output port of a computer is a commodity item which can be purchased for about twenty dollars at any computer store. Everything is packaged nicely and there is a volume control, a tone control, and a power supply which plugs into a 120V wall receptacle; the power output is several Watts. The load which these amplified speakers present to the audio source (computer, transceiver, or whatever) is in the range of ten thousand Ohms to a hundred thousand Ohms; in other words, the speakers present no significant load on any audio line to which they are connected. RLH