If you’re looking for a decent low-cost backup boomset for the shack, Field Day, trips, the car or truck, etc., I can recommend the Koss SB-45.
Discussed recently on the Elecraft reflector, I thought it was worth a look for my K3. After some on-air checks with Ross, K6GFJ, I then worked a few guys around NA on 20M SSB. Good audio reports. Last two Qs were today with the 2 teenage Youth DX operators in Costa Rica.
Decent construction. Made in America. Comfortable ear pads. Standard 3.5mm plugs for headphone and mic connections. Noise reduction mic. Nice cushioned headband — probably a (+) for those balding heads out there. Freq. response is 18-20,000 Hz….same as the Yamaha CM-500 headset.
Cost is $25.00 online.
73,
John, K6MM