I'm selling this because I bought it and put it away. New, unopened, and the plastic wrap hasn't been removed. Instant purchase OK, thank you. ---------- Final Sound Adjustment: Exploring Vacuum Tube Graphic Equalizers: Special Appendix: Luxman Vacuum Tube Graphic Equalizer Kit (ONTOMO MOOK) ▪️Book Overview ONTOMO MOOK, the fourth in the Luxman vacuum tube kit series, features a vacuum tube graphic equalizer. Audio frequency characteristics change depending on various factors such as volume, the room, speakers, and other equipment. With a graphic equalizer, you can create a comfortable sound to suit the situation. Although it's a kit, it only requires screwing the chassis, so anyone can easily and reliably build it with a Phillips screwdriver. The connection method is to connect the amplifier's REC OUT to the equalizer's input with an RCA cable, and connect the amplifier's PLAY or MONITOR to the equalizer's output with an RCA cable. The graphic equalizer has 5 bands (55Hz/220Hz/880Hz/3.5kHz/14kHz) and is easy to use, with ±8dB adjustment. Also, there is an on/off switch for the equalizer, so you can immediately compare the effects.