Short answer: the Violectric HPA V550 PRO. It ranks #11 of 19 headphone amplifiers by measured performance, rated 4.6/5, at $3,599.99; the Chord Alto ranks #16, rated 3.2/5, and costs $4,320, which makes this an easy call rather than a real tradeoff.
The Violectric HPA V550 PRO is the better-sounding choice. Violectric rates it at 4,700 mW into 32 ohms and 1,450 mW into 300 ohms, enough to drive nearly any headphone, and Audio Science Review measured a SINAD of 111 dB, clean for nearly all listening. The tradeoff: The Topping A50 III rates higher and measured cleaner in Audio Science Review’s tests for a small fraction of the price.
The case for the Chord Alto: Chord rates it at 2,100 mW into 32 ohms and 281 mW into 300 ohms, enough for most planar magnetic headphones and high impedance models alike. The tradeoff: Audio Science Review measured a SINAD of only 85 dB, a real audible weakness, especially with sensitive headphones.
Buy the Violectric HPA V550 PRO. It is rated higher than the Chord Alto and costs less, so it is the default pick unless a specific strength of the other one matters more to you.
Want more options? Browse the full Headphone Amps and DACs rankings.
Specifications Side By Side
| Violectric HPA V550 PRO | Chord Alto | |
|---|---|---|
| Price | $3,599.99 | $4,320.00 |
| Ranked | #11 of 19 in Headphone Amplifiers | #16 of 19 in Headphone Amplifiers |
| Device Type | Headphone amp | Headphone amp |
| SINAD | 111 dB (measured by Audio Science Review) | 85 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 4,700 mW (manufacturer rated) | 2,100 mW (manufacturer rated) |
| Output Power (300 ohms) | 1,450 mW (manufacturer rated) | 281 mW (manufacturer rated) |
| Headphone Outputs | 6.35 mm, 4-pin XLR balanced, 4.4 mm balanced | 6.35 mm, 4.4 mm balanced, 4-pin XLR balanced |
| Balanced Output | Yes (4-pin XLR, 4.4 mm, XLR line out) | Yes (4.4 mm, 4-pin XLR, XLR line out) |
| Inputs | 2 x RCA, XLR | RCA, XLR, 4.4 mm balanced |
| Outputs | RCA, XLR | RCA, XLR |
| Volume Control | Hardware knob (256-step relay attenuator, remote) | Hardware knob |
| Dimensions | 11.4” x 3.1” x 9.8” (290 x 80 x 248 mm) | 7.9” x 1.8” x 8.5” (200 x 44.5 x 215 mm) |
| Weight | - | 4.9 lbs (2.2 kg) |
Related Amp and DAC Comparisons
How Violectric HPA V550 PRO compares with other leading options:
- Topping A90 Discrete vs Violectric HPA V550 PRO
- SMSL VMV P2 vs Violectric HPA V550 PRO
- Tom Christiansen Audio HPA-1 vs Violectric HPA V550 PRO
- Violectric HPA V550 PRO vs Soncoz SGA1
- Violectric HPA V550 PRO vs Benchmark HPA4
Prices on this page were last checked October 11, 2026 at 4:59 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Amps and DACs In Full
Violectric HPA V550 PRO: $3,599.99 Amazon eBay
Pros: Violectric rates it at 4,700 mW into 32 ohms and 1,450 mW into 300 ohms, enough to drive nearly any headphone, and Audio Science Review measured a SINAD of 111 dB, clean for nearly all listening. It offers 6.35 mm, 4-pin XLR and 4.4 mm balanced headphone outputs, RCA and XLR inputs and outputs, and a 256-step relay volume control with a remote.
Cons: The Topping A50 III rates higher and measured cleaner in Audio Science Review’s tests for a small fraction of the price. It is an analog amp only, so you still need a separate DAC.
Full Violectric HPA V550 PRO review and specifications →
| Balanced Output | Yes (4-pin XLR, 4.4 mm, XLR line out) |
|---|---|
| Device Type | Headphone amp |
| Dimensions | 11.4” x 3.1” x 9.8” (290 x 80 x 248 mm) |
| Headphone Outputs | 6.35 mm, 4-pin XLR balanced, 4.4 mm balanced |
| Inputs | 2 x RCA, XLR |
| Output Power (300 ohms) | 1,450 mW (manufacturer rated) |
| Output Power (32 ohms) | 4,700 mW (manufacturer rated) |
| Outputs | RCA, XLR |
| SINAD | 111 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob (256-step relay attenuator, remote) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Chord Alto: $4,320.00 Headphones.com eBay
Pros: Chord rates it at 2,100 mW into 32 ohms and 281 mW into 300 ohms, enough for most planar magnetic headphones and high impedance models alike. It has 6.35 mm, 4.4 mm balanced and 4-pin XLR balanced headphone outputs, plus RCA, XLR and 4.4 mm inputs and RCA and XLR outputs for use as a preamp.
Cons: Audio Science Review measured a SINAD of only 85 dB, a real audible weakness, especially with sensitive headphones. It costs far more than the Sennheiser HDV 820, which rates higher and measured much cleaner, and its inputs are all analog, so you need a separate DAC for digital sources.
Full Chord Alto review and specifications →
| Released | 2025 (1 year ago) |
|---|---|
| Balanced Output | Yes (4.4 mm, 4-pin XLR, XLR line out) |
| Device Type | Headphone amp |
| Dimensions | 7.9” x 1.8” x 8.5” (200 x 44.5 x 215 mm) |
| Headphone Outputs | 6.35 mm, 4.4 mm balanced, 4-pin XLR balanced |
| Inputs | RCA, XLR, 4.4 mm balanced |
| Output Power (300 ohms) | 281 mW (manufacturer rated) |
| Output Power (32 ohms) | 2,100 mW (manufacturer rated) |
| Outputs | RCA, XLR |
| SINAD | 85 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
| Weight | 4.9 lbs (2.2 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons