SMSL SP400From real comments

Verdict distilled from 25 mentions across 12 aspects in comments under product review videos.

Positive sentiment39%
PROS 39%
CONS 61%

Rank based on 25 mentions across 12 aspects

View the verdict as

Buy this if...

  • You want guaranteed channel matching from a stepped-attenuator volume control
  • You value a screen, remote, and quad-mono THX AAA 888 balanced design
  • You have a hot-output DAC (5V+) to unlock its performance

What users love

Skip this if...

  • You need the full 12W at 16 ohms as advertised
  • You listen in a pitch-dark room and screens/lit displays bother you
  • You're driving very power-hungry headphones like Susvara at high volumes

What users complain about

Compare in seconds

Based on user comments

Best choice
1Premium
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Natural, non-fatiguing soundMQA and AK4499 chip appealClear upgrade over harsher rivalsUncertain heat outputHigh priceNo sharper sound signature option
SMSL VMV D2
Natural, non-fatiguing sound
MQA and AK4499 chip appeal
Clear upgrade over harsher rivals
Uncertain heat output
High price
No sharper sound signature option
2Premium
SMSL H400
Strong power deliveryReliable alternative to competitorsSound-tuning flexibilityCosts more than cheaper alternativesHigh price
SMSL H400
Strong power delivery
Reliable alternative to competitors
Sound-tuning flexibility
Costs more than cheaper alternatives
High price
3
HiFiMan Goldenwave GA10
Fully Balanced ArchitecturePremium, Understated BuildRich Tube Sound
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Fully Balanced Architecture
Premium, Understated Build
Rich Tube Sound
4Premium
iFi iCAN
Drives almost any headphoneUnique xBass and 3D tuning controlsMusical, layered, engaging soundHigh price questionedOverdamped decay / odd dynamics reportedCannot switch preamp and headphone outputs independently
iFi iCAN
Drives almost any headphone
Unique xBass and 3D tuning controls
Musical, layered, engaging sound
High price questioned
Overdamped decay / odd dynamics reported
Cannot switch preamp and headphone outputs independently
5Budget
SMSL VMV SAP1
Excellent value for moneyDrives demanding headphones with easeExceeds initial expectationsInconsistent regional pricingCheap-feeling volume knobLimited availability at some retailers
SMSL VMV SAP1
Excellent value for money
Drives demanding headphones with ease
Exceeds initial expectations
Inconsistent regional pricing
Cheap-feeling volume knob
Limited availability at some retailers
6Premium
iFi Pro iCAN
Extremely versatile tuning options
iFi Pro iCAN
Extremely versatile tuning options
7Mid
Monoprice Monolith THX AAA 887
Balanced XLR ConnectivitySought for Driving Hard-to-Drive HeadphonesSolid Metal Volume Knob
Monoprice Monolith THX AAA 887
Balanced XLR Connectivity
Sought for Driving Hard-to-Drive Headphones
Solid Metal Volume Knob
8Mid
Creative Sound Blaster E3
Strong Value on SaleGaming Software FeaturesImproved Dynamic RangeFull Price Feels HighUncertain Value vs E5
Creative Sound Blaster E3
Strong Value on Sale
Gaming Software Features
Improved Dynamic Range
Full Price Feels High
Uncertain Value vs E5
9Budget
SMSL RAW-HA1
Strong speaker amp performance
SMSL RAW-HA1
Strong speaker amp performance
10Mid
iFi Hip-DAC
Detailed, engaging sound
iFi Hip-DAC
Detailed, engaging sound
You are here
31Mid
SMSL SP400
Perfect channel matchingDetailed, technical balanced soundGood value versus pricier rivalsPower output falls short of claimsUnderperforms Topping A90 in powerRequires a high-output DAC
SMSL SP400
Perfect channel matching
Detailed, technical balanced sound
Good value versus pricier rivals
Power output falls short of claims
Underperforms Topping A90 in power
Requires a high-output DAC

Who wins on what

Ranked by what users actually praise

Overall Impression

Build and volume control impress reviewers. The SP400's relay-controlled resistor-ladder attenuator draws praise for delivering perfect channel matching, an advantage over conventional analog potentiometers that can suffer imbalance. It houses four THX 888 chips for true quad-mono balanced operation, and its power supply is noted as bigger than competitors like the Topping A90. A screen and remote add convenience, though some prefer a screen that can be disabled for dark-room use.

Power output claims are heavily disputed. Multiple commenters cite ASR measurements showing only about 5 to 6.25 watts into 16 ohms rather than the advertised 12W, and some say it underperforms the Topping A90 at various impedances despite costing more. One user even found their older SP200 louder than the SP400. Others note testing at different voltage standards (5Vrms vs 10Vrms) may explain some spec discrepancies, but skepticism about the marketed numbers persists.

Sound signature depends heavily on source and pairing. Users report the balanced output pushes a wider, more technical sound but can feel treble-forward with recessed mids compared to single-ended listening. Getting the best performance reportedly requires a high-output DAC like the M400 at 5.4V balanced; lesser DACs may leave the amp sounding underpowered. Some report crackling at very high sample rates, resolved by lowering to 192kHz, and the unit can run hot during extended sessions.

Outdated / Not-accurate data?