Power amplifier developed for use in professional settings such as recording studios and stage sides. ＜Condition＞ Working condition. There are some scratches, but overall good condition. There are scratches on the bottom. Please check the photos. ＜Accessories＞ Main unit only In recent years, due to changes in lifestyle, I have only used the 1706 power amplifier with the 101IT once a year to enjoy music for my daughter's Hinamatsuri (Doll Festival). No scratchy noise when adjusting the volume, and no scratchy noise from all 3 input terminals (as of January 2026) I hope you will enjoy a wonderful music life with the lively sound of this BOSE power amplifier 1706. Please feel free to ask if you have any questions. This is a used and stored item, so please refrain from purchasing if you are nervous or concerned. The following is a partial quote from Audio Heritage (website) 【BOSE 1706Ⅱ】 Power amplifier developed for use in professional settings such as recording studios and stage sides. Aluminum die-cast is used for the entire body case, and this is used as a heat sink. This design effectively cools the heat generated by high output while increasing the rigidity of the body, suppressing vibrations and resonances that adversely affect the sound. The 1706II is equipped with BOSE's patented PAP (Psycho Acoustically Processed) circuit. This circuit was developed to address the human ear's tendency to have difficulty hearing sounds in certain frequency ranges as the volume decreases, and it automatically controls the frequency balance to sound natural at any volume level. Equipped with 3 input terminals, allowing connection of various sources Volume and selector on the front panel Rec output terminal for direct output of input signals External dimensions: Width 218 x Height 60 x Depth 189mm Rated output: 20W + 20W (4Ω to 16Ω) Input: Line: Stereo 3 systems, RCA pin Output: Line: Stereo 1 system, RCA pin Speaker: Stereo 1 system, snap terminal Power supply: AC100V, 50Hz/60Hz Rated power consumption: 45W Weight: 2.7kg