de Lisle Amp-Speaker Selector 4×4 Deluxe Amp Switcher

I purchased this brand new about a year ago. It has been in my rack since day 1 and hasn't moved until I took it out to take pics today. I forgot to include it in the pics but it comes with the original power supply as well. Please let me know if you have any questions. From de Lisle: The de Lisle Amp-Speaker 4x4 Deluxe was designed to improve workflow in the studio by eliminating the need to re-cable amps and cabs. This version expands on our previous designs by incorporating simultaneous input switching and a bypassable attenuator loop. Plug in your guitar / pedalboard and send it to any of the 4 connected amps by rotating the Amplifier dial. The amp's output is then sent to the selected speaker cabinet. We've also included an attenuator loop that allows you to easily connect your Ox, Fryette, etc. to any combination of amplifier and cabinet. The 4x4 Deluxe runs off a 2.1mm/5.5mm center negative 12V supply, which is boosted internally for increased signal headroom. Amplifier inputs are transformer isolated to prevent ground loops. Unused amps are muted at the input and switched to a protective load. Desktop model shown. Rackmount enclosure available as an option. New features for 2024 models: There are now three options for amp input switching. DIRECT takes the front panel input and sends it directly to the input of the selected amp, bypassing any additional circuitry. This is the position for normal use. ISO, for ISOLATED, sends the input signal through an isolation transformer. This can be used to eliminate ground loops or when a low impedance output is desired. When the ground switch is in the left position, the isolation transformer is bypassed entirely and an op-amp buffer provides a low impedance output. Download the manual for the latest features and control layout. Specs: • Input Impedance: 1 Meg • Output Impedance: 500 Ohm • Input Sensitivity: +20 Vp-p • Switching Time: 4-8ms • Contact Resistance: 0.075 Ohm • Power Consumption: 2.14W Max • Guitar / Pedalboard Input (1) • Amplifier Input (4) • Amplifier Output (4) • Speaker Input (4) • Attenuator Input (1) • Attenuator Output(1) • Attenuator Bypass Switch • Transformer Isolation • Internally Isolated DC Power Supply • Silver Relay Contacts with Gold Overlay • Protection Loads for Unused Amplifiers • Auto Muting of Unused Amplifiers • Premium Chassis with Laser Etched Panels • 12VDC 700mA Power Supply Included • Hand-Wired • 150W Maximum Power Per Amplifier • Lifetime Warranty