Mosconi HLA-Dual

The Mosconi HLA-Dual is a compact 4-channel high-low adapter designed to integrate external amplifiers and DSP systems into existing car audio systems. It converts the speaker signals from the original car radio into low-level audio signals, thereby enabling the retrofitting of high-quality car audio components even without existing RCA outputs.

A unique feature of the HLA-Dual is its integrated load simulation, which mimics a connected speaker load. This makes the adapter particularly well-suited for modern vehicles equipped with speaker monitoring and diagnostic functions. This helps prevent error messages, signal shutdowns, and malfunctions caused by the factory speaker diagnostic system.

The built-in DC offset detection also enables the automatic generation of a remote power-on signal. This allows connected amplifiers or DSP systems to be turned on and off in conjunction with the factory radio without requiring a separate remote wire from the radio.

Thanks to its exceptionally compact design—which does not require an additional plastic housing or connectors—the Mosconi HLA-Dual can be installed directly in the vehicle's wiring harness or in close proximity to the car stereo, saving space.

Technical Specifications

General Characteristics

• Manufacturer: Mosconi

• Model: HLA-Dual

• Product Type: High-Low Adapter / High-Level Signal Converter

• Number of channels: 4

• Signal Conversion: High Level to Low Level

• Input signal: Car stereo speaker outputs

• Input signal: Low-level audio signal

• Suitable for: OEM audio systems and car stereos with high-power/BTL outputs

• Integrated Speaker Load Simulation

• Automatic Remote Detection via DC Offset

• Remote power-on requires at least 3 V DC at one input

• Compact design without a separate plastic housing

• Country of origin: Italy
  
  

Electrical Properties

• Operating voltage: 12 V DC

• Standby current consumption: < 0.8 mA

• Current consumption during operation (dual version): < 30 mA

• Reverse polarity protection: Yes

• High-level input impedance / load simulation: 45 ohms / 2 W per channel

• Maximum continuous power handling (sinusoidal, at 4 ohms): 25 W RMS per channel

• Maximum allowable rated power of the car stereo: 50 W RMS per channel

• Voltage ratio: 4:1

• Maximum output voltage: 3.2 V RMS at THD < 0.1%

• Minimum output load impedance: 2 kOhm
  
  

Audio Characteristics

• Total Harmonic Distortion (THD): < 0.01%

• Signal-to-noise ratio: > 100 dB

• Channel separation: > 60 dB

• Common-Mode Rejection Ratio (CMRR): > 60 dB

• Slew rate: 10 V/µs
  
  

Remote Output

• Automatic remote signal generation: Yes

• Remote Detection: DC Offset on BTL Speaker Outputs

• Remote output voltage: > 12 V at a load of less than 100 mA

• Maximum remote output current: 100 mA

• Minimum allowable load at the remote output: 120 ohms

• Short-circuit protection to ground: Yes

• Maximum permissible short-circuit duration: < 10 seconds
  
  

What's Included

• 1 × Mosconi HLA-Dual 4-Channel High-Low Adapter
  
  

Important Information

Automatic remote detection works with high-power car stereos that have BTL outputs and a DC voltage of at least 3 V at one of the inputs. The unit is powered on by the present DC voltage and not by the detection of a music signal.

The power ratings listed refer to actual RMS power values and not to short-term peak or PMPO values. A short circuit at the remote output that exceeds the permissible duration can cause permanent damage.