The 535-LA is a 500 series module based on API's 325 booster console cards. It can be used to amplify or attenuate incoming and outgoing signals while
535-LA Line Amplifier from API
API 535-LA Amplifier Review - Is it Worth It (2023 UPDATED) - Gemtracks Beats
Gear Hunter API - 535-LA
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API LA-535 500 Series Line Amplifier Pair Consecutive Serial Numbers
Rock oN Show Report AES2015 Day1 : API 535-LA
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New Gear Review: API 535-LA Line Amplifier – Music Connection Magazine
Rock oN Show Report AES2015 Day1 : API 535-LA
API 535-LA Line Amplifier (500 Series Module)
API 535-LA - Outboard - 500 Series Equalizers - Helios Online
api 535-LA ディスクリート ラインアンプ (500シリーズ), エフェクター・プロセッサー
535-LA（API）｜ミックスウェーブ［Mixwave］ ディスクリート ラインアンプ（500シリーズ）
New Gear Review: API 535-LA Line Amplifier – Music Connection Magazine
, Modeled after API's highly prized console-based 325 booster cards, the 535 can both amplify and attenuate incoming and outgoing signals for
API 535-LA Line Amplifier (500 Series Module)