SHARP Voice Matrix Amplifier OPTONICA MX-400 This is a SHARP product from half a century ago, during the analog era. While digital technology is used now, back then it was analog technology that lowered the voice sound. ...I thought, "さすが made in SHARP" (though I don't know about the current SHARP). Size: Width 240mm x Height 165mm x Depth 95mm The voice down effect only works with stereo sound sources, and the output is monaural. The effect of voice down varies depending on the left and right audio conditions of the stereo sound source. It is especially effective for enka (traditional Japanese ballad) recordings. The voice matrix effect is not noticeable in current songs sung by many people with extra syllables. In other words, the more the voice source in the stereo sound source is in the center, the more effective it is. There is no instruction manual, but you can use it if you have some experience. Sound output has been confirmed. Wiring is: Sound source player ←→ This unit ←→ Amplifier ←→ Speakers. There are some scratches and dirt on the main unit, but there is no major damage, and there are no problems with switch operation. Please understand that this is a used item. Since there is no original box, we will take care in packaging, wrapping it in air-cushion packaging (bubble wrap) and storing it in a recycled cardboard box for shipping. Although it is a used item, it can still be used actively, so how about it for karaoke practice? #Sharp #VoiceMatrixAmplifier #MX400 #184