Natsuko Miyamoto

https://youtu.be/YWSBtZ384qY?t=38 Natsuko Miyamoto does use the Ampeg V-4B Bass Head on Studio Recording

Natsuko Miyamoto plays here an Ampeg SVT-450H Classic Series 450-Watt Bass Amp Head in a Studio Session Oct 4 2020 at Studio Revival Tokyo

Natsuko Miyamoto uses an Ampeg SVT-810E 8x10 Bass Cabinet. This can be confirmed by the visible logo on the bottom and top corners, and the beveled back shown in the video "MASS OF THE FERMENTING DREGS - Studio Session 'You / Uta Wo Utaeba / Endroll'" at the 5:22 timestamp.

Natsuko Miyamoto is seen using an Ampeg Venture VB-410 4 x 10-inch 600-watt Bass Cabinet during a live performance. The Ampeg logo is visible at the top, revealing the four speakers. This can be confirmed at the 10:45 timestamp in the video "MASS OF THE FERMENTING DREGS - Live at Elsewhere NY Brooklyn, Nov 19th, 2023 (Full Show)" uploaded by MASS OF THE FERMENTING DREGS on YouTube.

Natsuko Miyamoto is seen using an Ampeg Heritage 50th Anniversary SVT Head in a live performance by MASS OF THE FERMENTING DREGS, as documented in the YouTube video "MASS OF THE FERMENTING DREGS - Live at Elsewhere NY Brooklyn, Nov 19th, 2023 (Full Show)" at the 1:03:10 timestamp.

Natsuko Miyamoto can be seen using an Ampeg SVT 3 Pro bass amplifier head during a live performance. This is evidenced by the video "MASS OF THE FERMENTING DREGS - 鳥とリズム at O-nest, Tokyo" on YouTube, timestamped at 2:22, provided by the channel MASS OF THE FERMENTING DREGS.

Natsuko can be seen using an Ampeg B2 Combo 1x15" throughout this studio performance.