Speaker-level inputs or line output converter (LOC)?
AX-ALOC710 | Axxess Integrate
amplifier - Tap signal from TDA2822L, convert to line and instrument level - Electrical Engineering Stack Exchange
BOSS B65N Speaker Level to Line Level Output Converter
Amazon.com: XANTECH SLLC1 Speaker Level To Line Converter (Discontinued by Manufacturer) : Electronics
Russound ADP-1.2 Speaker-level to Line-level Adapter at Crutchfield
Russound ADP-1.2, Speaker-Level to Line-Level Stereo Converter — Blue Star Wholesale Distributors | Miami | Orlando
Line Output Converter Explained - How to Install & Features to look for! - YouTube
Resistor ratings for line level converter | diyAudio
DIY Line Level Converter for cheapie amps so you can use a powered sub - Techtalk Speaker Building, Audio, Video Discussion Forum
Amazon.com: Scosche LOC2SL Line Output Converter Adjustable Amplifier Add On Module for Car Stereo, 2-Channel Signal Sensing Speaker Wire to RCA Adapter with Remote Control Knob, Black : Electronics
JL Audio LoC-22: Fully Active, Two-Channel Speaker Level to Line Output Converter with Auto Turn-On - Creative Audio
A good line output converter (for a home stereo) that can handle 65 watts RMS / ~100 max? : r/AskElectronics
Impedance Circuit To Convert Line Level To Mic Level, 55% OFF
ACI speaker to line level converter for use with Force/Titan subs. These is the internal
Line level to phono input
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Amazon.com: Speaker RCA Line Level Converter Adaptor High Low Hi Lo with Gain Control Add : Electronics