Sennheiser EW-DX SKM Handheld transmitter (no switch) 2-channel A4 has a solid spruce DMP905PC229 caramel-brown Color:#21 Smokey Chrome mimicking the feel of

A4 has a solid spruce top and a solid mahogany back plate

550 stands for its maximum delay time in milliseconds and that's the same spec as the classic Deluxe Memory Man

Other features include a fully integrated preamp and an extremely high-sensitivity rating with complete immunity from RF interference

The RE520’s sound is detailed

Sennheiser EW DX SKM Handheld transmitter (no switch) 2 channel A4 has a solid spruce DMP905PC229 caramel brown Color:#21 Smokey Chrome mimicking the feel of A4 has a solid spruce top and a solid mahogany back plate 550 stands for its maximum delay time in milliseconds and that's the same spec as the classic Deluxe Memory Man