MM type - M M type

... Cartridges can be broadly classified according to the power generation method into electromagnetic, piezoelectric, condenser, and photoelectric types. Electromagnetic is a general term for types that generate power through electromagnetic induction between a magnet and a coil. Two types are particularly commonly used: the moving magnet type (abbreviated as MM type), in which the coil is fixed and the magnet is moved by the vibration of the needle tip, and the moving coil type (abbreviated as MC type), in which the magnet is fixed and the coil is moved. The output voltage of the MC type is less than 1/10 of that of the MM type, and it needs to be amplified by a low-noise amplifier called a head amplifier or a step-up transformer before being connected to a preamplifier. ...

*Some of the terminology that refers to the "MM type" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　カートリッジを発電方式で大別すると，電磁形，圧電形，コンデンサー形，光電形などになる。電磁形は磁石とコイルの電磁誘導によって発電するタイプの総称で，コイルを固定して磁石を針先の振動で動かすムービングマグネット形(略称MM形)，逆に磁石を固定してコイルを動かすムービングコイル形(略称MC形)の2種がとくによく用いられる。MC形はMM形に比べて出力電圧が1/10以下と低く，プリアンプに接続する前にヘッドアンプと呼ばれる低雑音増幅器，もしくは昇圧トランス(変圧器)で増幅する必要がある。…

※「MM 形」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報