High level speaker signal to Low level RCA adapter (4-channel). Mosconi HLA-SUM.

Mosconi Hi to Low High End adapter. HLA-SUM.

Active signal processor circuitry for a superior sound performance; 
Full balanced input stage to improve noise rejection and response velocity; 
Improved ballast load to match output impedance of the radio; 
Unbalanced line output to drive any kind of amplifier; 
Low tolerance and high quality passive components; 
Optimized A class working operational amplifiers; 
Low Total Harmonic Distortion; 
Protection against power supply inversion; 
Switch-on signal (Remote) generation; 
Current protection on switch-on output to avoid damages when ground shorting occurs; 
Operative status red LED; 
Full Surface Mount Technology (SMT); 
Reduced size to optimize installation; 
4 channel Power Inputs on versatile and easy to use, removable, screw terminals; 
4 channel Line Level Outputs on solid RCA connectors; 
SUM capability on CH-1 outputs to rebuild filtered signals (multi-way systems); 
Professional Aluminum enclosure; 
BALANCE capability between CH-1 & CH-2 inputs (SUM mode only) so to optimize the system adjustment; 
Double side FR4 industry standard printed circuit board for long term reliability and excellent environmental stability; 
Optimized signal path to increase noise immunity; 
Shut down conditioning on switch-on signal to avoid bumps and pop noises; 
Supports High Power Output (B.T.L.) and Low Power Output (S.E.) radios; 
Very low quiescent current (less than 0.8mA @ 14V4); 
Low operative current consumption (less than 30mA @ 14V4); 
Output signal up to 3.2Vrms @ 12V of power supply; 
Input stage can handle signals as high as 50W of equivalent power onto 4 Ohm; 
13 dB voltage attenuation between Power Input and Line Level Output (a 50Watt @ 4Ohm power signal applied to the input, produces a 3.2Vrms Line Output signal); 
Plug & Play – non intrusive installation.