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The all-new 4040 A integrated amplifier has been designed to reprise the essence of the original CAS4040 which was launched in 1982 to great aclaim. While huge technological advances and modern digital features have propelled the 4040 A into the 21st century, the listening pleasure it creates continues to release the same endorphins its ancestor did 40 years ago.


The 4040 A’s intuitive user interface and sophisticated menu system are easily navigated either by remote control or rotary control knobs.


The “Feature Rich” 4040 A contains three analogue signal inputs, including two pairs of unbalanced RCA sockets and one pair of fully balanced XLR sockets. Its electronic volume and balance control enables precise 1dB adjustment over a 70dB range. Tone controls further enhance its flexibility, if required..


Vinyl music lovers can install an optional plug-in Sequel mk4 Phono Pre-amp in place of Line 2 to match a wide range of Moving Magnet and high-output Moving Coil cartridges.


A dedicated, high current, headphone amplifier will drive a wide-range of headphones via a front panel-mounted jack socket.


Coaxial SPDIF, optical TOSLINK, USB class 2 and aptX Bluetooth 5.0 enable most digital sources to be connected.


The 4040 A leverages the power of a 32-bit ES9018K2M Sabre32 reference DAC to convert digital signals into analogue.


Modern, multi-driver loudspeakers using complex cross-over circuitry present a heavy demand on any amplifier. The 4040 A employs cutting-edge MERUS™ Infineon technology to enable it to drive even the most difficult loads to realistic listening levels with high fidelity. Aux1 can be selected as a DIRECT power amp input.


The key to the integrated amplifier’s impressive performance is in its high-frequency power supply, optimised for audio electronics, enabling the latent quality of its amplifier to be realised. The performance is unaffected by mains quality or voltage stability. Unlike most conventional amplifiers, its 350-Watt power supply is voltage stabilised, enabling it to double its power output into half the load impedance, regardless of the mains voltage.


Signal sensing enables the 4040 A to reduce power consumption by powering down non-essential circuitry when not required. Standby timeout can be selected in the menu.



  • Power output: 55 W into 8 Ohms, 110 W into 4 Ohms, both channels driven

    Continuous max output current: >8A, current limited

    THD and Noise: <0.01%

    Signal to Noise Ratio: 102dBA Aux input, loaded

    Frequency Response: 1Hz to 50 kHz, +/-3dB

    Input sensitivity: 440mV

    Crosstalk: >100dB at 1 kHz

    Pre-Amp Inputs: 2x RCA (unbalanced) and 1x XLR (balanced)

    Plug-in Phono options: Aux 2 changes to Phono with a Sequel mk4 MM Phono fitted

    Digital inputs: 1x co-axial, 1x optical, 1x USB 2.0 PCM & DSD, Bluetooth aptX HD

    Digital to Analogue Converter: ES9018 Sabre premier stereo DAC

    Loudspeaker Outputs: 4mm binding posts with rear and side entry, plus a spade lug

    Speaker output impedance: <0.02 Ohms 20Hz to 20 kHz. Damping factor >400 into 8 Ohms

    Headphone Output socket: 6.3mm stereo jack socket for 30 – 300 Ohm headphones

    Mains input voltage range: 100V to 240V nominal, 50Hz or 60Hz (automatic multi-region)

    Fuse: Built into the power supply and not user serviceable.

    Power Consumption: 5W, 250W, <0.5W – Idle, Max, Standby

    Auto Standby: The amp will switch off automatically after an adjustable pre-set time, with no signal, or standby can be defeated in Menu.

    Finish colours: Optional silver or black front panel. Black outer cover only

    Weight: 2kgs (4.4 lbs) net, 3kgs (6.6 lbs) gross (packed)

    Size W/H/D: 21.5 x 6 x 25.5 cm (8.46″ x 2.36″ x 10”) including feet, knobs, LS terminals and BT antenna.

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