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DC4 Power Supply

Ultimate Level DC Power Supply with all-new DC4 modules and CX filter sections for low current outputs

Our ultimate PSU, borne from over 10 years of high-end audio PSU expertise. This is the true cost-no-object concept PSU that clients keep asking us for, and it is finally here! We are taking orders now - due to the custom manufacturing of each mains transformer to suit your bespoke requirements, there is a lead time of typically 4-6 weeks for the transformer plus 2 weeks for PSU construction once the transformer arrives [UPDATE - as of April 2020, due to the COVID-19 situation, transformer lead times may be longer in some cases]

The DC4 uses a larger case than the DC3, and can be fitted with 1, 2 or 3 outputs. If you require more than 3 outputs, then you will need to order multiple DC4 units. In some configurations, it may be possible to build hybrid DC3/DC4 PSUs to suit specific cost/performance requirements.

We get a lot of emails asking about "double regulation". Please note that *ALL* of our DC2, DC3 and DC4 designs (including our Naim Audio PSU range) are double regulated *AS STANDARD*. Our regulator module design actually delivers around 8-10 times less noise than if you had two single-regulated versions of our circuit in simple series. We gain very little advantage in performance by connecting two of our double-regulated modules in series, and there are downsides of increased heat dissipation and extra space needed, hence we have never offered this as an option.


Full width all-aluminium casework, 450mm wide by 290mm deep. Case height is approximately 155mm including the IsoAcoustics Gaia feet - this is a relatively tall unit, which is required in order to fit the custom transformer. 135mm height is an option if we fit our lower-profile feet, just ask.

IsoAcoustics Gaia feet are used to reduce chassis vibration from external sources. These are superb units that really improve the sound of equipment, if bought separately they are around 200 GBP for a set but we feel that the improvement that they make is well worth it at this level of equipment.

Furutech gold-plated IEC inlet for mains AC supply (as with all of our PSUs, an IEC cable is not supplied with the DC4), a rear panel mains power switch can also be included for convenience if desired at no additional cost.

Custom-made ultimate specification toroidal transformer (400VA for single-output DC4s, 600VA for 2 and 3 output PSUs) with multiple shielding layers, fully enclosed in a stainless steel shell for additional shielding and noise suppression. Vibration isolation mounting system is used to eliminate chassis vibration which can affect the regulator circuitry. 

An all-new module design is used for the DC4 rectification and reservoir capacitor arrays. The new PCB is 2.4mm thick for additional rigidity and is gold-plated. Low-noise Schottky diodes are used for rectification, and the reservoir capacitors used are our usual Mundorf capacitors - twice the number of capacitors are fitted in comparison to the equivalent DC3 PSU. Additional noise filtering is provided by a new higher-spec set of parts than the DC3 design, with a lower impedance and higher current handling capability. The PCB uses vibration isolation mountings in order to isolate the components and the DC wiring loom from chassis vibration.

The entire DC wiring loom is made using Neotech OCC wiring with PTFE insulation - all expertly routed and bound with our usual high levels of attention to detail. A neatly bound cable loom reduces noise due to current loop areas as well, so it brings a sonic benefit as well as looking nice!

The DC4 regulator module also contains our new "CX" module - this acts to drastically reduce incoming DC noise from the reservoir capacitors, by factors of up to around 1,000 at low currents. The module has an approximate limit of 2A though, at which the noise reduction factor becomes close to 1, and so the DC4 regulator module has a link which allows the CX module to be manually bypassed if the output is supplying more than 2A of current. This link can be set at time of manufacture to your requirements, and can be changed by the user in the future as well (involves removing the top cover and moving some small link plugs). 

DC4 regulator modules can supply up to 5A continuous current as standard, unlike the DC3 design which required a separate boost module.

The DC4 regulator PCB, like the rectification/capacitor PCB, is also gold-plated, and the circuit layout is completely optimised for performance, low noise and low impedance. This is due in part to using different components that allow shorter circuit paths to be created, with lower parasitic inductances/capacitances.

The new DC4 regulator design uses the very best components - we use a full set of Vishay Z-foil "naked" resistors for the regulator section, and extremely low noise resistors for the (non-critical) CX section and for one filter network of the regulator itself. We also now use Vishay bulk film capacitors for all decoupling duties, as well as some very special Audio Note KAISEI capacitors for all the important regulator module capacitors. These are a relatively new capacitor, designed by the same team behind the legendary Black Gate capacitors. The CX module uses the same Nichicon KZ "MUSE" capacitors as the DC3 design, as we found that the AN capacitors made no difference at all here.

The DC4 is supplied with output cables to suit the client's requirements where possible, DC4 cables are made from Neotech OCC wire with PTFE insulation just like the internal wiring, and are fitted with Oyaide gold-plated DC connectors for those that require tube-type plugs with a 2.1 or 2.5mm inner hole. Other connectors can be fitted depending on availability of suitable parts.
    (1 output)
    e.g. Chord M-Scaler

    (2 outputs)
    e.g. switch/clock combo

    (3 outputs)
    e.g. Chord DAVE

    3 to 25VDC (fixed)
    5A max. current
    & 1m output cable(s)
    with Mundorf caps
    Enquire for customisations