The Radio Design D-SH1M is a surface mounted, stereo / mono, headphone amplifier for audio installations of any kind. Museum exhibits, private audio monitoring installations, and listening stations are among some of the possible applications the D-SH1M is suitable for. The module mounts conveniently in a precut opening in a wood or metal enclosure or in various RDL mounting accessories.
The dual-channel headphone amplifier features balanced/unbalanced left and right inputs that accept operating levels between -20 dBV and +20 dBu. Two recessed slide switches located on the side of the rear enclosure are set prior to mounting the module. One of the switches sets the input sensitivity, the other selects between stereo and mono operation. The front panel level control is a long-life potentiometer. Because audio does not pass through this control, it can provide years of noise-free level adjustment.