HAUCXL - Under Counter Active, Monaural, Balanced Headphone Control Box Made in USA This monaural, active, compact headphone amplifier mounts under a table or counter and provides headphone volume control for broadcast applications, recording studios, language labs, etc. Description Handles headphones from 8 to 600 Ohms with low distortion and wide frequency response. 1/4" and 1/8" headphone jacks and volume control are provided on the front panel. One stereo 1/8" TRS jack (actively summed to mono) and mono, balanced XLR input / through connections on the rear. Powered with 24 VDC adapter (included). Housed in a box with rounded edges - easy on clothes and knees. Quality checked and tested prior to shipping.