Audio-Technica Phono Equalizer AT-PEQ3 Phono Preamp For VM/MM Cartridges Only Allows you to listen to records even with devices that do not have a built-in phono equalizer. Cannot be used with record players that have a built-in phono equalizer or MC cartridges. You can now enjoy analog records with mini-component systems and CD radio-cassette players that do not have phono input terminals. Impedance: 47000Ω Includes adapter. Used for about six months, but I am selling it because I purchased a mixer.