重低音(じゅうていおん)very low frequency bass (audio reproduction), heavy bass sound, low-register sound

重(おも)低音(ていおん)がボンボンと響(ひび)いています。

The heavy bass sound is resonating loudly.

この低(てい)い音(おと)は重(おも)低音(ていおん)と括(くく)られるでしょう。

This low sound would be classified as heavy bass sound.

振動(しんどう)とも取(と)れるこの低音(ていおん)が、重(おも)低音(ていおん)なのだそうだ。

This low sound, which can also be perceived as a vibration, is said to be heavy bass sound.

重(おも)低音(ていおん)は音(おと)というより振動(しんどう)として感(かん)じられるのだそうです。

It is said that heavy bass sound is felt more as a vibration than as a sound.

２０〜３０ヘルツを低音(ていおん)、それ以下(いか)の低音(ていおん)を重(おも)低音(ていおん)と呼(よ)びます。

Sounds from 20 to 30 Hertz are called low sounds, while those below that are called heavy bass sound.