Short answer: the Little Labs Monotor for better measured performance, the Fosi Audio SK01 for the lower price. The Little Labs Monotor ranks #14 of 19 headphone amplifiers, rated 3.6/5, at $580. The Fosi Audio SK01 ranks #17, rated 3.2/5, at $79.99, $500.01 cheaper.
The Little Labs Monotor is the better-sounding pick. Audio Science Review measured a SINAD of 109 dB, clean for nearly all listening. The catch: Little Labs doesn’t publish a power figure into 32 ohms, and there are no balanced headphone outputs.
The case for the Fosi Audio SK01: A rated 2,400 mW into 32 ohms gives plenty of drive for most headphones, including many planars, from 3.5 mm and 6.35 mm outputs. The catch: Audio Science Review measured a SINAD of only 85 dB, a real audible weakness that can show up as noise or hiss, especially with sensitive in-ears.
Buy the Little Labs Monotor if measured performance matters more than the price. Buy the Fosi Audio SK01 if the price matters more than measured performance.
Looking for alternatives? See the complete Headphone Amps and DACs rankings.
Specifications Side By Side
| Little Labs Monotor | Fosi Audio SK01 | |
|---|---|---|
| Price | $580.00 | $79.99 |
| Ranked | #14 of 19 in Headphone Amplifiers | #17 of 19 in Headphone Amplifiers |
| Device Type | Headphone amp | Headphone amp |
| SINAD | 109 dB (measured by Audio Science Review) | 85 dB (measured by Audio Science Review) |
| Headphone Outputs | 2 x 6.35 mm, 2 x 3.5 mm | 3.5 mm, 6.35 mm |
| Balanced Output | No | No |
| Inputs | XLR/TRS combo, TRS, 3.5 mm aux | 3.5 mm analog |
| Volume Control | Stepped attenuator knob | - |
| Output Power (32 ohms) | - | 2,400 mW (manufacturer rated) |
| Outputs | - | 3.5 mm line out |
| Equalizer | - | Yes (bass, mid, treble tone controls) |
| Dimensions | - | 4.8” x 2” x 1.7” (121 x 51 x 43 mm) |
| Weight | - | 0.6 lbs (290 g) |
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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
Little Labs Monotor: $580.00 Sweetwater eBay
Pros: Audio Science Review measured a SINAD of 109 dB, clean for nearly all listening. It has two 6.35 mm and two 3.5 mm headphone outputs, XLR/TRS combo, TRS and 3.5 mm inputs, and a stepped attenuator for precise volume matching.
Cons: Little Labs doesn’t publish a power figure into 32 ohms, and there are no balanced headphone outputs. The JDS Labs Atom Amp 2 rates higher, measured cleaner and is rated at 2,650 mW into 32 ohms for far less.
Full Little Labs Monotor review and specifications →
| Balanced Output | No |
|---|---|
| Device Type | Headphone amp |
| Headphone Outputs | 2 x 6.35 mm, 2 x 3.5 mm |
| Inputs | XLR/TRS combo, TRS, 3.5 mm aux |
| SINAD | 109 dB (measured by Audio Science Review) |
| Volume Control | Stepped attenuator knob |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
- Little Labs Monotor vs Benchmark HPA4
- Little Labs Monotor vs Rupert Neve Designs RNHP
- Little Labs Monotor vs Chord Alto
- Little Labs Monotor vs Soncoz SGA1
- Little Labs Monotor vs HeadAmp Gilmore Lite Mk2
- Little Labs Monotor vs Tom Christiansen Audio HPA-1
- Little Labs Monotor vs Topping A90 Discrete
- Little Labs Monotor vs Topping A70 Pro
Fosi Audio SK01: $79.99 Amazon eBay
Pros: A rated 2,400 mW into 32 ohms gives plenty of drive for most headphones, including many planars, from 3.5 mm and 6.35 mm outputs. Bass, mid and treble tone controls let you adjust the balance without software. It is compact at 121 mm wide and costs little.
Cons: Audio Science Review measured a SINAD of only 85 dB, a real audible weakness that can show up as noise or hiss, especially with sensitive in-ears. It accepts only a 3.5 mm analog input, so it needs a separate source and has no balanced output. The Loxjie D30 rates higher and measures far cleaner for a little more.
Full Fosi Audio SK01 review and specifications →
| Released | Jul 2023 (3 years ago) |
|---|---|
| Balanced Output | No |
| Device Type | Headphone amp |
| Dimensions | 4.8” x 2” x 1.7” (121 x 51 x 43 mm) |
| Equalizer | Yes (bass, mid, treble tone controls) |
| Headphone Outputs | 3.5 mm, 6.35 mm |
| Inputs | 3.5 mm analog |
| Output Power (32 ohms) | 2,400 mW (manufacturer rated) |
| Outputs | 3.5 mm line out |
| SINAD | 85 dB (measured by Audio Science Review) |
| Weight | 0.6 lbs (290 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons