I use an ANKER Mini and it works perfectly. Great sounding speaker!! I
believe It's under US $30 on Amazon.
Bert VE3NR
On 2026-02-16 19:50, Henry Pollock - K4TMC via Elecraft wrote:
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
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