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The name ERCO (not pronounced airco but ˈert͡so) is Esperanto for ore. They took to Esperanto for the name inspired by its creator Ludwik Lejzer Zamenhof, who used to live around the corner from their offices near Warsaw. Zamenhof started developing Esperanto in his childhood while still in school, pursuing peace around the world where one language would bring together humankind. Ferrum want to do the same through pure and honest music reproduction. In the end it brings peace to the mind.

Unique output cable design: two wires delivering the power and two wires providing the feedback to ensure flat voltage at every moment. They named this technique Ferrum Power Link (FPL) and it eliminates the harmful effects of the cable’s resistance effectively improving transient response. The current delivery speed at the powered device’s input is significantly improved.

ERCO comes with a carefully selected DC power adapter. To get the most out of ERCO you can connect it with HYPSOS using proprietary Ferrum Power Link DC power cable. This FPL cable can be ordered separately.

1,975.00  VAT included

Brands and series
SKU: p3_FRR_SRC_HAMP Categories: , , Tag:

Headphone output gain: balanced -5.8 dB, +6 dB, +17.8 dB; single ended -11.8 dB, 0 dB, +11.8 dB
Operation: fully balanced, proprietary IC power amp
Power inputs: 5.5/2.5 mm DC connector center positive; proprietary FPL 4-pin DC connector (FPL)
Analog inputs: RCA (Consumer level; Pro option with future software update)
Digital inputs: USB-C (MQA, up to PCM 32-bit/384 kHz, DSD256, DoP128); S/PDIF coaxial (MQA, up to PCM 24-bit/192 kHz, DoP64); S/PDIF optical (MQA, up to PCM 24-bit/96 kHz guaranteed, should work up to PCM 24-bit/192 kHz and DoP64 – depends of user’s optical cable and transmitter)
DAC chip: ESS Sabre ES9028PRO
PCM sample rates: 44.1 / 48 / 88.2 / 96 / 176.4 / 192 / 352.8 / 384 kHz
DSD sample rates: 2.8224 / 3.072 / 5.6448 / 6.144 / 11.2896 / 12.288 MHz
MQA: decoder and renderer (USB, OPTO and COAX inputs)
DAC resolution: PCM up to 384k@32bit; DSD up to 256 (11.2 MHz / 12.2 MHz)
Headphone jack outputs: balanced 4.4 mm (TRRRS); unbalanced 6.35 mm (TRS)
Line outputs: balanced XLR; unbalanced RCA (both Consumer level; Pro with future software update)
Volume control: analogue with bypass option (bypass for line outputs only)
Frequency response: 10 Hz – 30 kHz (+/- 0.05 dB); 10 Hz – > 200 kHz (+/- 1 dB)
Output power unbalanced: 300 mW into 300 Ω; 1.7 W into 50 Ω
Output power balanced: 1.2 W into 300 Ω; 6.1 W into 50 Ω
THD on balanced output: < 0.00018% / -115 dB, 1 mW into 16 Ω; < 0.00018% / -115 dB, 100 mW into 16 Ω THD on unbalanced output: < 0.00032% / -110 dB, 1 mW into 16 Ω; < 0.00057% / -105 dB, 100 mW into 16 Ω Dynamic range analog: 130 dB (A-weighted) Dynamic range digital: 120 dB (A-weighted) Input impedance: 47 kΩ Output impedance unbalanced: 22 Ω on pre-amp Output impedance balanced: 44 Ω on pre-amp Output impedance Headphones: < 0.3 Ω Power consumption: idle <15 W Power adapter: 100-240 VAC to 22-30 VDC

Additional information

Weight 1.8 kg
Dimensions 206 × 217 × 50 mm



Polish pioneer in the field of headphone amplifiers.

While exploring their roots, the new Ferrum team realized that the region where they were all born and worked for the last part of their lives has a history of craftsmanship. One of these crafts was driven by the very large iron deposits in the Warsaw region, which led to metallurgical specialization.

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