Balancing Transformer
230 VAC / 115 + 115 VAC, balancedIsolates your equipment from the domestic network. Output voltages are symmetrical with respect to an artificial centre tap connected to the PE contact of each socket.
Versatile Power Conditioner
ST-900V
Pure power. Any side up.Clean, stable power for high-end and Hi-Fi AV equipment from a balancing toroidal transformer designed by Audes, in a chassis with no left, right, top or bottom. Place it wherever your system needs it.
900V∙A rating
5Isolated outlets
4 AMax AC output
14.8 kg33 lbs
Developed on 90 years of engineering tradition since 1935, for true connoisseurs of high-end audio and home cinema.
Overview
ST-900V — built for freedom.
The AUDES ST-900V is engineered to supply clean, stable power to high-end and Hi-Fi AV equipment. At its heart is a custom-designed balancing toroidal transformer, 230 VAC / 115 + 115 VAC, developed by Audes, which isolates your system from the domestic network.
It is partially based on the ST-900DC, but its design has been completely revised so you can freely choose where and how to place it in your system. Stand it upright beside a rack, lay it flat on a shelf, or turn it to whichever side suits your setup.
Beyond its form, the ST-900V is functionally identical to the ST-900DC, including the integrated DC blocker, and provides all of the same benefits for audio quality.
Any side up: no left, right, top or bottom
Clean, stable power for every component
Lower noise from the mains
Quieter operation with the integrated DC blocker
Fuse and thermal protection
Placement
No left, right, top or bottom.
The ST-900V can be put on whichever side is most suitable for your setup. It comes with a set of rubber feet: attach them wherever you wish, or not at all.
Stand it upright
A slim tower beside a rack or behind your equipment, with the outlets in a single column.
Lay it flat
A low profile for a shelf or the floor, with the five outlets in a row.
Your choice of feet
Fit the supplied rubber feet to whichever side faces down, or leave them off.
About the Audes ST-900V
A New Shape. The Same Pure Power.
Inside, the ST-900V keeps everything that makes the ST-900DC sound right: a balancing toroidal transformer, fully isolated outlets and an integrated DC blocker.
The Toroidal Heart
A custom-designed balancing toroidal transformer, developed by Audes.
Current on Demand
Up to maximum power in each outletWith its very low output impedance, the transformer easily supplies large, instantaneous current surges, up to the maximum power, in each outlet.
Engineered for Stability & Silence
Mains Noise Filtering
The toroidal transformer is designed to filter noise from the mains using controlled leakage inductance and capacitance.
Integrated DC Blocker
Protects the unit from direct current present in the mains, significantly reducing transformer hum caused by DC offset for quieter operation.
Fully Isolated Outlets
All five outlet sockets are fully isolated from the mains, with symmetrical output voltages referenced to an earthed artificial centre tap.
Fuse & Thermal Protection
A fuse protects against overcurrent; if it blows, it must be replaced before the conditioner can be used again. Thermal protection switches the transformer off at 90 °C and reconnects it automatically once it has cooled to 75 °C.
Technical Advantages
Every detail in service of silence.
Free Placement
Any side up · rubber feet includedA completely revised chassis with no fixed orientation, so the conditioner fits your system rather than the other way round.
Mains Noise Filtering
Balanced 115 + 115 VControlled leakage inductance and capacitance filter noise from the mains, delivered through a balanced, centre-tapped output.
DC Blocking
IntegratedRemoves the DC component present on the mains, significantly reducing transformer hum.
Instant Current
Very low output impedanceLarge current surges, up to the maximum power, in each outlet the moment your equipment asks for them.
Layered Protection
T 4 A fuse · 90 °C / 75 °CAn overcurrent fuse and transformer thermal protection that reconnects automatically once the transformer has cooled.
100% Made in the EU
Handcrafted in EstoniaEuropean quality with control at every stage of production, from transformer design to final assembly and testing.
Technical Specifications
ST-900V in detail.
Power rating900 V∙A
Max AC output4 A
Inlet10 A IEC C14
FuseT 4 A slow-blow
Outlets5 × 16 A / 250 VAC CEE 7/3
Power supply cable10 A / 250 VAC IEC C13
Dimensions (mm)120 H × 260 W × 365 D
Dimensions (in)4¾″ H × 10¼″ W × 14⅜″ D
Weight14.8 kg / 33 lbs
Supply line protectionType C 16 A circuit-breaker
Connection
Connections, explained.
The ST-900V has five Schuko outlets on one face, all fully isolated from the mains, and an inlet panel on one end with the power switch, inlet and fuse. Select a number to see what each part does.
- 01Power Switch
Turns the unit on and off.
- 02AC Inlet · IEC C14 & Fuse
10 A inlet, 220–240 VAC, 50/60 Hz, with a T 4 A slow-blow fuse that protects against overcurrent. If it blows, replace it before using the conditioner again. Pair with the Audes Power Cable C13.
- 03Model and Serial
Shows the model name and the serial number of the unit.
- 045 Outlets
Five CEE 7/3 sockets on the adjacent face, fed by the 900 V∙A balancing transformer and fully isolated from the mains.
Installation note: the power supply line from the distribution board to the ST-900V must be protected by a Type C 16 A circuit-breaker.
Why Toroidal
Two ways to clean power. Only one disconnects you from the grid.
The ST-900V is built around an Audes balancing toroidal transformer, not transformerless filtering. Its 900 V∙A transformer gives every outlet a balanced supply that is fully isolated from the mains.
See how the two approaches differ, an honest side-by-side comparison, and why Audes chose the transformer.
Galvanic isolationNo direct wire between the wall and your system.
Balanced powerCommon-mode noise cancels itself at the load.
Current reservoirPeak amplifier demands met without compression.
Perfect for Home Cinema
Clean power. Stunning picture.
Clean power is not only about extraordinary sound; it transforms the picture too. Free of interference and supply instability, your projector or display reveals its full potential.
- Deeper blacks
- Vivid colours
- Precise detail
- Smooth motion
Recommended
Audes Power Cable C13.
For further performance improvement, we recommend combining the ST-900V with the specially designed Audes power cable for its 10 A IEC C14 inlet.
Every ST-900V ships with a standard power cable in the package; the Audes cable is sold separately.
Handcrafted in Estonia
Where Pure Physics Meets
Where Pure Physics Meets
Reference Fidelity.
Every ST-900V is engineered and hand-built in Estonia around a transformer designed and developed by Audes, the same in-house expertise behind nine decades of Audes audio.
Designed & manufactured
100% in the European Union
100% in the European Union
Reliability. Safety.
Performance.
Performance.