Усилители мощности стерео — Dayens Ecstasy IV Slim

The Ecstasy IV Slim is a slim stereo power amplifier from Dayens, the Serbian maker led by Zoran Dobrin, whose products are built by hand. It was announced on 7 March 2025 at EUR 2,990 and is designed to match the Ecstasy IV preamplifier, which costs EUR 2,790, in footprint and appearance, so the two can be stacked in a rack or placed side by side.

Key specs that matter

The amplifier works in Class AB and delivers 2 x 110 W into 8 ohm and 2 x 160 W into 4 ohm. Frequency response is 4 Hz to 200 kHz, and noise is more than 92 dB below the signal. Each channel uses two pairs of Japanese bipolar output transistors. Power comes from a 400 VA toroidal transformer with custom power electrolytic capacitors made in Germany. Mundorf MCap Supreme EVO capacitors sit at the input. Each channel has its own aluminium heat sink, and the amplifier has a single stereo input for the preamplifier signal. The amplifier measures 460 x 90 x 300 mm and weighs 10 kg.

Engineering and use context

Class AB biases the output transistors so that both halves of each pair conduct around the zero crossing, which avoids the crossover distortion of pure Class B while keeping heat lower than in Class A. Bipolar transistors in pairs share the output current, so each device works further from its limits. The toroid radiates little magnetic field and is flat enough for the slim case. The film capacitors at the input block DC from the preamplifier and pass the audio signal. Separate heat sinks for the two channels keep the thermal behaviour of one channel from affecting the other. The wide bandwidth means the amplifier's own response does not limit the audio band. The slim case height is what distinguishes the model from the larger Dayens power amplifiers, and it lets the amplifier fit into racks where full-height units do not. The rise in output into the lower load shows the supply can deliver extra current into lower impedances, although it does not double. Hand assembly in Serbia follows the practice of the brand across its range.

Pairing

The Ecstasy IV preamplifier is the intended partner, matched in size and style. With its power reserve, the amplifier suits the majority of passive speakers for a room of about 20 m2, and stacking it with the preamplifier keeps the interconnects short.

Alternatives

The Dayens Ecstasy IVse is the dual-mono stereo power amplifier with two 400 VA transformers and 2 x 175 W into 8 ohm.