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With the two processors QL810SP and QL812SP, ESX shows what real high-end DSPs can do. Even the equipped components are the finest: not only that audiophile 32-bit converters from AKM's 5-series were installed, two of the ADAU1452 and thus the best processors from Analog Devices are used. This is exactly where the wheat is separated from the chaff: Conventional DSPs usually only have one DSP core. However, if a DSP has many channels and the corresponding equipment, computing power becomes scarce. Not so with the new ESX top models, on the contrary. The two QL-DSPs have so much reserve that they can easily process not only 12 channels, but the developers also implemented the revolutionary ESX Expert Staging Equalizer with balance and level function, which enables further refinements in fine tuning, in addition to numerous functions.


A powerful ARM Cortex® M4 High Performance CPU with 240 MHz and internal 1024 kB flash memory takes care of command processing. This is the only way to work in real time with maximum performance. With the new QL812SP, ESX is now also cementing its high standards in the area of high-end DSPs: In the test review in the specialist magazine Car & Hifi 3/2022, the QL812SP was so convincing that the test editors not only classified it as a highlight, but also immediately as the best DSP "below 2000 Euros". This is outstanding insofar as it is only available for 1000 euros.


Test conclusion: „With the QL812SP, ESX has made a big splash. It leads the way with its finest hardware and the new software is a big step forward with powerful audio capabilities. If you add the generous equipment including Bluetooth and APP, the QL812SP for sound freaks is the most attractive DSP on the market below 2000 Euros.“ (Elmar Michels, Test Editor)

  • Analog Devices™ ADAU1452 Dual 2 x 32 Bit Processor, 294 MHz, Full HD Audio 96 kHz
  • AKM Velvet Sound™ Series 5 Signal Converter, A/D 32 Bit, D/A 32 Bit
  • HPF/LPF/BP @ 6-48 dB, Phase Shift, Time Correction 0 ~ 20 ms/0.01 ms steps
  • Input Mixer, Subwoofer Control:
  • Input Sensitivity: Low Level 1 ~ 6 V/RMS, High Level 1 ~ 15 or 15 ~ 45 V/RMS
  • Signal-to-noise Ratio (A-weighted): ignal-to-noise Ratio (A-weighted) 111 dB, Digital Input 117 dB
  • Total Harmonic Distortion: ignal-to-noise Ratio (A-weighted) <0,001%, Digital Input <0,0004%
  • Integrated Bluetooth® Receiver (incl. Antenna) for DSP control via App and Fully HD Audio Streaming
    Bluetooth-Version 5.0, Profiles: A2DP/AVRCP, Codecs: aptX, aptx LL, aptX HD, AAC, SBC
  • Optional Accessories: RC-DQ (LCD remote control)

QL812SP € 999,00*

Digital 12-Channel Sound Processor


8 x RCA Input

8 x High Level Input with EPS PRO up to 40 V/RMS

1 x Optical stereo, S/PDIF 192 kHz, 24 bit

1 x Coaxial stereo, S/PDIF 192 kHz, 24 bit

1 x Bluetooth® stereo

1 x USB Type B for PC Software

1 x RJ45 for Remote Controller / Extension Cable

1 x Power Input incl. REM OUT and MODE switch pin



12 x RCA Output @ 6 V RMS (THD+N <0.0004%)

with each a 31 Band EQ, PEQ / Highshelf / Lowshelf



226 x 43 x 120 mm


Owner's Manual

Test Review

EISA Award

DSP Software


RC-DQ € 79,00*

LCD Remote Controller for QUANTUM QM66SP

Volume: Controls the overall volume of the music system

Mode: Selection of up to 8 different sound setups

Bass: Volume control for connected subwoofer


Including 5 meter cable and aluminum mounting housing


Owner's Manual

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 * Manufacturer's suggested retail price, changes and mistakes reserved