Audes ST-1500DC Power Conditioner

Audes ST-1500DC Power Conditioner – Clean Mains Power for High-End Systems

The Audes ST-1500DC is a power conditioner with integrated DC blocker, developed by Estonian manufacturer Audes for use with high-end audio and AV equipment. At the heart of the Audes ST-1500DC power conditioner is a 1500 VA balanced toroidal transformer — designed entirely in-house — that galvanically isolates connected equipment from the mains. Only clean, stable power reaches your system.

Low Output Impedance for Dynamic Current Demands

During highly dynamic musical passages, a power amplifier draws current peaks of 50 to 100 amperes from the mains. An ordinary wall socket cannot reliably supply these levels due to high output impedance. The ST-1500DC has a very low DC output resistance and delivers these peaks without voltage drop. The amplifier's response to the audio signal improves measurably — particularly in the lower frequency range.

Low-Pass Filtering at 800 Hz Against Mains Pollution

The transformer is designed to act as a low-pass filter with a cut-off frequency of 800 Hz. Mains interference from dimmers, switch-mode power supplies and motor controllers is almost entirely removed. The symmetrical winding construction works on the principle of mutual cancellation. The CEE 7/3 sockets are galvanically isolated from the external mains network.

DC Blocker and Protection Circuits

The integrated DC blocker eliminates direct current components from the mains supply. This prevents the mechanical hum that DC offset causes in transformers of connected equipment — without any negative effect on sound quality. The ST-1500DC also features overload protection, thermal protection, and a soft start that limits inrush current to approximately 20 A.

Key Specifications

• Type: Power conditioner with integrated DC blocker
• Power rating: 1500 VA
• Inlet: 16 A, IEC C20
• Outlets: 8 × CEE 7/3 (16 A / 250 VAC)
• Filter: Low-pass, cut-off frequency 800 Hz
• Transformer: Balanced toroidal, 230 VAC / 115 + 115 VAC
• Thermal protection: Shutdown at 90 °C, auto-reconnect at 75 °C
• Soft start: Inrush current limited to approx. 20 A
• Dimensions: 477 × 180 × 347 mm
• Origin: Estonia

Frequently Asked Questions

Which components benefit most from the Audes ST-1500DC power conditioner?

The ST-1500DC works with both solid-state and valve equipment, source components and AV projectors. The best result is achieved by connecting the entire system to the power conditioner. Mains plug polarity makes no difference — the symmetrical design makes this irrelevant.

What does the integrated DC blocker do?

DC offset on the mains causes mechanical hum in transformers of amplifiers and other components. Audes' in-house DC blocker eliminates this in a sonically neutral way — without reducing the sonic benefit delivered by the power conditioner.

Can the ST-1500DC be expanded?

Yes. Adding an Audes ST-200 creates a twin-transformer configuration — technically equivalent to the TT-1700DC. Source components and power amplifiers each receive their own dedicated transformer, which further improves sound quality.