Short answer: the SMSL VMV P2. It ranks #6 of 19 headphone amplifiers by measured performance, rated 4.8/5, at $999; the Violectric HPA V550 PRO ranks #11, rated 4.6/5, and costs $3,599.99, which makes this an easy call rather than a real tradeoff.
Why pick the SMSL VMV P2: Audio Science Review measured 116 dB SINAD, so its noise and distortion are inaudible. Watch for: It has only analog inputs, so you need a separate DAC to play music from a computer or phone.
The case for the Violectric HPA V550 PRO: 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 catch: The Topping A50 III rates higher and measured cleaner in Audio Science Review’s tests for a small fraction of the price.
Buy the SMSL VMV P2. It is rated higher than the Violectric HPA V550 PRO and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Headphone Amps and DACs rankings cover every ranked option.
Specifications Side By Side
| SMSL VMV P2 | Violectric HPA V550 PRO | |
|---|---|---|
| Price | $999.00 | $3,599.99 |
| Ranked | #6 of 19 in Headphone Amplifiers | #11 of 19 in Headphone Amplifiers |
| Device Type | Headphone amp | Headphone amp |
| SINAD | 116 dB (measured by Audio Science Review) | 111 dB (measured by Audio Science Review) |
| Output Power (32 ohms) | 6,000 mW (manufacturer rated, balanced) | 4,700 mW (manufacturer rated) |
| Output Power (300 ohms) | 700 mW (manufacturer rated, balanced) | 1,450 mW (manufacturer rated) |
| Headphone Outputs | 6.35 mm, 4.4 mm balanced, 4-pin XLR balanced | 6.35 mm, 4-pin XLR balanced, 4.4 mm balanced |
| Balanced Output | Yes (4.4 mm, 4-pin XLR, XLR pre out) | Yes (4-pin XLR, 4.4 mm, XLR line out) |
| Inputs | RCA, XLR | 2 x RCA, XLR |
| Outputs | RCA, XLR | RCA, XLR |
| Volume Control | Hardware knob | Hardware knob (256-step relay attenuator, remote) |
| Dimensions | 11” x 2” x 9.3” (280 x 51 x 235.7 mm) | 11.4” x 3.1” x 9.8” (290 x 80 x 248 mm) |
| Weight | 7.2 lbs (3.25 kg) | - |
Related Amp and DAC Comparisons
How SMSL VMV P2 compares with other leading options:
- SMSL VMV P2 vs Topping A30 Pro
- SMSL VMV P2 vs Topping A70 Pro
- SMSL VMV P2 vs Topping A90 Discrete
- Schiit Midgard vs SMSL VMV P2
- SMSL VMV P2 vs Tom Christiansen Audio HPA-1
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
SMSL VMV P2: $999.00 Linsoul eBay
Pros: Audio Science Review measured 116 dB SINAD, so its noise and distortion are inaudible. A rated 6 W balanced into 32 ohms and 700 mW into 300 ohms is enough for nearly any headphone, including demanding planar magnetic and high impedance models. It offers 6.35 mm, 4.4 mm balanced and 4 pin XLR headphone outputs plus RCA and XLR inputs and outputs, so it can also work as a preamp.
Cons: It has only analog inputs, so you need a separate DAC to play music from a computer or phone. The Topping A50 III earns the same rating and measured cleaner for a fraction of the price, and the Topping A70 Pro publishes about twice the power for less. At 3.25 kg it is a large desktop unit.
Full SMSL VMV P2 review and specifications →
| Balanced Output | Yes (4.4 mm, 4-pin XLR, XLR pre out) |
|---|---|
| Device Type | Headphone amp |
| Dimensions | 11” x 2” x 9.3” (280 x 51 x 235.7 mm) |
| Headphone Outputs | 6.35 mm, 4.4 mm balanced, 4-pin XLR balanced |
| Inputs | RCA, XLR |
| Output Power (300 ohms) | 700 mW (manufacturer rated, balanced) |
| Output Power (32 ohms) | 6,000 mW (manufacturer rated, balanced) |
| Outputs | RCA, XLR |
| SINAD | 116 dB (measured by Audio Science Review) |
| Volume Control | Hardware knob |
| Weight | 7.2 lbs (3.25 kg) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
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