Where can I buy a Lemo connector?
Some Sennheiser beltpack transmitters require a Lemo connector adapter in addition to the Sennheiser adapter cable.
You can buy a 3.5 mm to Lemo connector adapter here. These adapters are used for the Sennheiser SK 2000, 3000, 5000, 6000, 9000 series transmitters.
Check the Catchbox Mod Transmitter Compatibility List for more details.