ESX QL812SP

With the QUANTUM QL812SP, ESX introduces a high-performance 12-channel digital sound processor for high-end car audio systems. High-quality 32-bit signal converters from the AKM Velvet Sound Series 5 and two ADAU1452 DSP processors from Analog Devices enable exceptionally precise digital sound processing at a 96 kHz sampling rate.

The enormous processing power offers extensive options for custom sound tuning. In addition to digital crossovers, time alignment, and parametric equalizers, the QL812SP features the ESX Expert Staging Equalizer with additional functions for optimizing spatial sound imaging.

With eight analog inputs, digital audio connections, and twelve RCA outputs, the sound processor is suitable for both complex, fully active sound systems and for enhancing the sound quality of high-end factory-installed audio systems.

Thanks to built-in Bluetooth 5.0, music signals can be transmitted wirelessly, and all DSP settings can be conveniently configured using the ESX DSP Toolkit app. Alternatively, comprehensive PC software is available. The optional RC-DQ LCD remote control provides additional control directly from the driver's seat.

The ESX QL812SP was recognized by the trade magazine *Car & Hifi* in its March 2022 issue and also received the 2022–2023 EISA Award in the In-Car Sound Processor category.

Technical Specifications

General Characteristics

• Model: ESX QL812SP

• Series: QUANTUM

• Device Type: Digital Full HD Audio Sound Processor

• DSP output channels: 12

• Analog Input Channels: 8

• DSP processors: 2 x Analog Devices ADAU1452

• DSP Architecture: Dual 32-bit

• Processor clock speed: 294 MHz

• DSP processing: 48 internal channels

• Computing power: 2 x 1.2 billion MAC operations per second

• Sampling rate: 96 kHz

• Signal Converter: AKM Velvet Sound Series 5

• A/D conversion: 32 bits

• D/A conversion: 32 bits
  
  

Audio Characteristics

• Frequency response: 5 – 45,000 Hz

• Analog signal-to-noise ratio (A-weighted): 111 dB

• Digital signal-to-noise ratio (A-weighted): 117 dB

• Analog distortion factor: less than 0.001%

• Digital distortion factor: less than 0.0004%

• Output voltage: 6 V RMS

• Master Gain: 0–60 dB

• Channel gain: −20 to +6 dB

• Phase setting: Normal / Inverted
  
  

DSP Settings and Equalization

• Digital Crossovers: High-Pass, Low-Pass, and Band-Pass

• Filter slope: 6–48 dB/octave

• Runtime correction: 0–20 ms

• Runtime correction adjustment increments: 0.01 ms

• Output equalizer: 10 x 31-band

• Input Equalizer (Standard Mode): 10 x 31-band

• Input Equalizer Expert Mode: 6 x 31-band

• Expert Staging Equalizer: 4 x 31-band

• Equalizer Types: PEQ, High-Shelf, and Low-Shelf

• Equalizer adjustment range: ±12 dB

• Equalizer adjustment increments: 0.5 dB

• Staging EQ: With balance and level controls

• Input mixer: Built-in

• Subwoofer Control: Built-in

• DSP memory slots: 8 presets

• Preset Auto Switch: Automatic preset switching via a switch input

• Priority Input Mode: Prioritized switching between digital signal sources
  
  

Audio Inputs

• 8 x RCA input, balanced

• 8 high-level inputs via Molex connectors

• 1 x optical digital input, stereo S/PDIF, 96 kHz / 24-bit

• 1 x coaxial digital input, stereo S/PDIF, 192 kHz / 24-bit

• 1 Bluetooth stereo audio input

• Low-level input sensitivity: 1–6 V RMS

• High-level input sensitivity: 15–45 V RMS

• High-level input sensitivity without internal jumper: 2–15 V RMS

• Low-level input resistance: 10 kΩ

• High-level input resistance: 10 Ω

• EPS PRO Fault Protection System for Integration into Factory-Installed Audio Systems
  
  

Audio Outputs

• 12 x RCA output

• Output voltage: 6 V RMS

• Custom DSP Configuration of the Output Channels
  
  

Bluetooth and Controls

• Bluetooth version: 5.0

• Bluetooth receiver: Built-in

• Bluetooth antenna: Included

• Bluetooth profiles: A2DP, AVRCP

• Supported audio codecs: aptX, aptX LL, aptX HD, AAC, SBC

• Wireless Audio Streaming: Yes

• DSP Control via Bluetooth: Yes

• Smartphone App: ESX DSP Toolkit

• App Compatibility: Android and iOS

• PC Software: ESX DSP Toolkit

• PC Compatibility: Windows 10 or later

• USB port: Type B

• Remote control connection: RJ45

• Optional remote control: ESX RC-DQ with LCD display
  
  

Electrical Characteristics and Connections

• Operating voltage: 7.5–17 V DC

• Automatic Power-On Function: DC / VOX / OFF

• Remote output: Available

• MODE Switch Input: Present

• Recommended fuse: 3 A

• Fuse not included
  
  

Dimensions

• Width: 226 mm

• Height: 42 mm

• Depth: 120 mm