Feliks Audio Envy Susvara Edition Headphone Amplifier
Feliks Audio Envy Susvara Edition Headphone Amplifier
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The Feliks Audio Envy Susvara Edition is a flagship Class A, single-ended, output transformer-coupled tube headphone amplifier handcrafted in Poland. Specially factory-tuned for maximum synergy with ultra-demanding planar magnetic headphones—including the original HiFiMAN Susvara—the Susvara Edition elevates performance to Anniversary levels. Featuring upgraded amorphous-core output transformers, UPOCC single-crystal copper signal wiring, and a dedicated "Susvara" gain setting, it delivers up to 9 Watts of pure Class A power to drive the most difficult headphone loads with total authority and natural 300B harmonic richness.
Ordering Note: Specially built-to-order amplifier. Please allow approximately 6 to 7 weeks for delivery.
KEY FEATURES & DESIGN HIGHLIGHTS
- High-Power Class A 300B Architecture: Single-ended, output transformer-coupled circuit utilizing matched Stradi S300B power tubes and PSVANE CV-181 Mk2 (6SN7) driver tubes.
- Dedicated "Susvara" Gain Profile: Features an optimized gain mode delivering up to 9W max output power (a 12% increase over the original Envy), providing exceptional dynamic headroom for low-sensitivity headphones.
- Amorphous-Core Output Transformers: Upgraded output transformers offer superior frequency extension, rapid transient response, and ultra-low noise levels.
- Anniversary-Level Componentry: Wired with UPOCC single-crystal copper internal cabling and precision components from Jantzen, Vishay, Nichicon, and Dale.
- Preamplifier Functionality: Functions as a high-end preamplifier equipped with switchable RCA and balanced XLR inputs and outputs (up to 5V RMS).
- Selectable Impedance Matching: Includes three output impedance settings (LO, MID, HI/SUSVARA) to optimize damping and matching across various headphone loads.
SPECIFICATIONS
| Amplifier Architecture | Class A Single-Ended, Transformer-Coupled Tube |
| Power Tubes | 2x Stradi S300B Matched Pair |
| Driver Tubes | 2x PSVANE CV-181 Mk2 / 6SN7 Matched Pair |
| Maximum Power Output | Up to 9 W (at "Susvara" gain setting) / 5 W at 16 Ω (MID setting, 1% THD) |
| Frequency Response | 18 Hz – 40 kHz (±1 dB) / 7 Hz – 100 kHz (±3 dB) |
| Audio Inputs | 2x Unbalanced RCA Pairs (IN1, IN2), 1x Balanced XLR Pair (IN3) |
| Input Sensitivity / Impedance | 1 V RMS / 100 kΩ (RCA), 10 kΩ (XLR) |
| Headphone Outputs | 1x 4-Pin Balanced XLR, 1x 6.35 mm (1/4") Jack |
| Pre-Amplifier Outputs | 1x RCA Pair, 1x Balanced XLR Pair (Max 5V RMS output @ 600 Ω, THD < 0.5%) |
| Impedance Selector Guidance | LO: Up to 60 Ω | MID: Up to 300 Ω | HI / SUSVARA: Up to 600 Ω |
| Internal Output Impedance | LO (at 32 Ω load): 3.8 Ω | MID (at 100 Ω load): 8.8 Ω | HI (at 600 Ω load): 20 Ω |
| Internal Wiring / Transformers | UPOCC Single-Crystal Copper Wiring / Amorphous-Core Transformers |
| Power Consumption / Voltage | 110 VA / 230 V (±5%) 50/60 Hz |
| Dimensions (W x D x H) | 330 x 350 x 185 mm (without tubes) / 330 x 350 x 245 mm (with tubes installed) |
| Net Weight | 15.1 kg (33.3 lbs) |
| Included Accessories | Matched Stradi S300B Pair, Matched CV-181 Pair, AC Power Cord, User Manual, Warranty Card |
| Country of Origin | Poland (Feliks Audio) |
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