Nady Systems HPA-4 Amplificator casti

Four totally independent stereo high-power headphone amplifier/line distribution channels in a convenient single rack package
Input Source Select switches and Phone and Line 1/4" TRS stereo outputs on each channel, and 4 independent stereo input sections (each with servo-balanced L & R 1/4" TRS jacks) enable independent selection of any of the 4 stereo signals for each headphone amp/line distribution channel
This matrixing capability allows selecting from up to 4 completely independent monitor signals for each set of headphones connected to the HPA-4 for optimum monitoring flexibility or 4 separate choices for each channel’s Line Output for enabling many useful, simple audio switching/routing solutions
Separate Volume control for each channel adjusts the level to both phone and parallel line outputs.
Easily expandable for optimum versatility in any application—up to four HPA-4’s can be daisy chained for additional fully selectable headphone/line distribution requirements
High-quality, rugged construction for maximum reliability
Shielded internal dual regulated power supply with ~115V(60Hz)/~230V(50Hz) select switch and fused IEC power cord connector