At a glance
- Device type
- Headphone amplifier
- Amplifier technology
- Solid-state
- Headphone outputs
- 4-Pin XLR, 4.4 mm, 6.3 mm
- Built-in DAC
- No
- Power
- 4.7 W @ 32 Ω · 1.45 W @ 300 Ω
Violectric HPA V550
High-end preamp and headphone amplifier with neutral precision and extensive connectivity.
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At a glance
- Device type
- Headphone amplifier
- Amplifier technology
- Solid-state
- Headphone outputs
- 4-Pin XLR, 4.4 mm, 6.3 mm
- Built-in DAC
- No
- Power
- 4.7 W @ 32 Ω · 1.45 W @ 300 Ω
Violectric HPA V550
High-End Headphone Amplifier and Preamplifier – Successor to the V281
The Violectric HPA V550 is the successor to the highly regarded V281 and adopts the analog functions of the award-winning DHA V590 – but without a DAC. It offers perfect control of all dynamic headphones and an outstanding preamplifier stage. The latest developments from Violectric and Niimbus have been implemented consistently. All functions can be conveniently controlled with the elegant aluminium remote control.
Technology Highlights
- Ultra-low noise: extremely low internal gain makes self-noise practically inaudible.
- High output voltage: 50 V internal operating voltage – ideal for high-impedance headphones.
- High output power: massive reserves for low-impedance and planar-magnetic headphones.
- High damping factor: extremely low output impedance for linear frequency response and precise control.
Remote Control
The solid aluminium remote control operates motorized volume, mute, input selection, headphone and line-out switching.
Connections & Features
- 3 analog stereo inputs: 2× RCA (unbalanced), 1× XLR (balanced)
- ±18 dB pre-gain for optimal matching between source and headphones
- Motorized Alps RK27 volume control and balance knob
- 4 amplifier stages with 6400 mW @50 Ω and 21 V RMS @600 Ω
- DC and overload monitoring, delayed output activation
- Headphone outputs: 1× 6.3 mm (unbalanced), 1× 4-pin XLR and 1× 4.4 mm Pentaconn (balanced)
- Line-out: 1× RCA (unbalanced), 1× XLR (balanced), output level adjustable ±18 dB
- 2 toroidal transformers with more than 35,000 µF filter capacitance
- Dimensions: 290 × 80 × 248 mm (W × H × D)
Package Contents
- 1× Violectric HPA V550
- 1× Remote Control
- 1× Power Cord
- 1× User Manual
Not sure if the Violectric HPA V550 is the right model for you? In our The Great Violectric Model Comparison we put every model in the lineup head-to-head.
Who is the HPA V550 best suited for?
The HPA V550 suits listeners who want the maximum analogue amplifier power in the lineup – ideal for very high-impedance or hard-to-drive headphones – and who are happy with classic, motorized potentiometer volume control. The right choice for anyone who wants reference-level power without paying extra for the PRO version's relay-based volume control.
Technical Data
| Item No. | 1007797 |
| Inputs (analogue, stereo) | 1× XLR (balanced), 2× RCA (unbalanced) |
| Max. input level | +21 dBu |
| Input impedance | 10 kΩ |
| Line outputs (stereo) | 1× XLR (balanced), 1× RCA (unbalanced) |
| Line-out gain | –18 / –12 / –6 / 0 / +6 / +12 / +18 dB |
| Line-out max. output level | +21 dBu |
| Line-out output impedance | 1 Ω |
| Nominal input sensitivity | +6 dBu |
| Amplifier gain | 0 dB unbalanced / +6 dB balanced |
| Pre-gain | –18 / –12 / –6 / 0 / +6 / +12 / +18 dB |
| Frequency response | 5 Hz – 250 kHz (–0.5 dB) |
| Balance | ±6 dB |
| Output impedance (headphones) | 0.15 Ω unbalanced / 0.3 Ω balanced |
| Damping factor (50 Ω load) | 320 unbalanced / 160 balanced |
| Dynamic range | > 131 dB (A-weighted) |
| Noise | < –103 dBu (A-weighted) |
| THD+N (1 kHz, 2 × 10 V into 100 Ω = 1 W) | < –102 dB / < 0.0008 % |
| THD+N (1 kHz, 2 × 4 V into 32 Ω = 0.5 W) | < –100 dB / < 0.001 % |
| Crosstalk | –105 dB (1 kHz) / –100 dB (15 kHz) |
| Headphone outputs | 1× 4-pin XLR (balanced), 1× 4.4 mm Pentaconn (balanced), 1× 6.3 mm jack (unbalanced) |
| Max. output power (balanced, both channels driven, 1 kHz, THD+N < 0.1 %) | 740 mW into 600 Ω (21.1 V) 1,450 mW into 300 Ω (20.9 V) 4,300 mW into 100 Ω (20.7 V) 6,400 mW into 50 Ω (17.9 V) 4,700 mW into 32 Ω (12.3 V) 2,000 mW into 16 Ω (5.7 V) 1,300 mW into 8 Ω (3.2 V) 700 mW into 4 Ω (1.7 V) |
| Volume control | ALPS RK27, motorised (remote control) |
| Power supply | 2 toroidal transformers, > 35,000 µF filter capacitance |
| Mains voltage | 230 V AC / 115 V AC, max. 50 VA |
| Enclosure | Aluminium, black anodised (front 8 mm, rear 3 mm, case 3–4 mm) |
| Case dimensions (W × H × D) | 290 × 80 × 248 mm |
| Overall dimensions (W × H × D) | 290 × 90 × 275 mm |
| Colour | Black |
Manufacturer data (Violectric TechGuide and manual HPA V550, December 2022). All values RMS, unweighted, 20 Hz – 20 kHz, pre-gain set to 0 dB.
VIO-HPA-V550
Data sheet
- Device type
- Headphone amplifier
- Amplifier technology
- Solid-state
- Built-in DAC
- No
- Power into 32 Ω
- 4.7 W @ 32 Ω
- Power into 300 Ω
- 1.45 W @ 300 Ω
- Headphone outputs
- 4-Pin XLR, 4.4 mm, 6.3 mm
- Balanced output
- Yes
- Inputs
- XLR, 2× RCA
- Output impedance
- 0.15 / 0.3 Ω
- Pre-amp output
- Yes
- Product type
- Headphone amplifier
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