I use a SoundMatters FoxL powered speaker driven from the KX3 headphones output. It works great with lots of sound to easily fill a room. I suspect that other small portable powered speakers with a wired input should work well.
73, Henry - K4TMC On Mon, Feb 16, 2026 at 7:42 PM Walter Underwood via Elecraft < [email protected]> wrote: > The KX3 “PHONES” jack is for headphones. It produces 100 mW. —wunder, K6WRU > > > On Feb 16, 2026, at 3:44 PM, Jim Brown via Elecraft < > [email protected]> wrote: > > > > On 2/16/2026 3:15 PM, Phil Hystad via Elecraft wrote: > >> Can someone give pointers on this? > > > > The K3, K3S, and K4 have separate audio power amplifiers for headphones > and speakers, each with their own individual output jacks. I haven't > studied the schematic, but I suspect that the KX3 has only the amplifiers > for headphones. Speakers require considerably more power. > > > > The headphone output could probably drive a powered speaker (that is, > one with its own built-in amplifier), but powered speakers are notoriously > bad for RFI, both generating noise and being susceptible to nearby > transmitters, so are unlikely to be a solution. > > > > 73, Jim K9YC > > ______________________________________________________________ > > Elecraft mailing list > > Home: http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net > > Please help support this email list: http://www.qsl.net/donate.html > > Message delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
