Singxer
Singxer SA-90 Class AB Mono Power Amplifiers (pair)
Best mono amplifiers for audiophiles seeking pristine, high-fidelity stereo sound.
Experience exceptional audio with the Singxer SA-90 Class AB Mono Power Amplifiers, sold as a pair for a complete stereo setup. Engineered for ultra-low distortion and high bandwidth, these amplifiers offer completely independent left and right channels. Each unit features a robust 300W shielded toroidal transformer and high-quality components for superior sound reproduction. Enjoy flexible input options and advanced speaker protection for a reliable and immersive listening experience.
$1299.00
Owner Satisfaction
4.6
/ 5
Category Rank
851
/ 1688
#851 in Power Amplifiers
Price vs Category Average
-84%
Below average
Amplification Class
Class AB
/ Class AB
Who it's for
- Owners of demanding speakers requiring high current and tight control
- Audiophiles seeking an expansive and precise stereo soundstage
- Listeners who prefer natural warmth and detailed sonic reproduction
Who should skip it
- Buyers prioritizing brands with long-standing analog amplification legacies
- Users with limited rack space or strict cable management budgets
- Owners of small, enclosed cabinets lacking proper ventilation
Performance breakdown
Signal Clarity
Ultra-low distortion levels ensure an exceptionally clean and transparent audio output.
Channel Separation
Independent mono architecture eliminates crosstalk for a precise and expansive soundstage.
Power Delivery
Robust toroidal transformers provide consistent, stable power for demanding speaker loads.
System Versatility
Flexible gain and input options integrate seamlessly into diverse high-end setups.
Build Integrity
Solid construction and premium components ensure long-term reliability and sonic performance.
Safety Features
Advanced protection circuitry safeguards your speakers against potential electrical faults.
Key Specs
Amplification Class
Class AB
Rated Output Power
90W @ 8 ohm per channel
Max. Output Power
200W @ 4 ohm (THD+N=1%)
SNR
> 140dB (A-weighted, RCA input, Low gain)
Total Harmonic Distortion
-110dB (A-weighted, 20W, 8 ohm)
Impedance
4 Ohms, 8 Ohms
Gain Adjustment
16dB (Low), 23dB (High)
Inputs
1x Single-ended RCA, 1x Balanced XLR, GND terminal
Features
- Class AB Mono Design for low distortion
- Independent stereo channels
- Powerful 300W toroidal transformer per channel
- Adjustable gain settings (16/23dB)
- Switchable input for RCA and XLR
- Advanced speaker protection system
- High bandwidth, low noise performance
- Precision-tuned differential stages
What customers say
The Singxer SA-90 amplifiers earn high praise for delivering exceptional value and superior sonic performance. Users consistently report outstanding clarity, detailed instrument separation, and an expansive soundstage, noting a significant upgrade over lesser amplifiers. The Class AB design provides a warm yet highly resolving sound with authoritative bass and smooth treble. Build quality is also a highlight; the chassis feels robust and well-engineered. Many audiophiles feel these mono blocks offer performance levels usually reserved for much more expensive equipment. This combination of high fidelity and accessible pricing makes the SA-90 a highly recommended choice for serious listeners.
Know before you buy
The mono design means each speaker is powered by its own dedicated amplifier unit. This ensures complete electrical and physical separation between the left and right channels, which significantly reduces crosstalk and improves stereo imaging.
Yes, the SA-90 features switchable inputs, allowing you to connect either single-ended RCA or balanced XLR cables. You can easily toggle between them based on your preamplifier's output capabilities.
The two gain settings—16dB and 23dB—allow you to better match the amplifier's sensitivity to your preamplifier and speakers. Use the lower gain setting if you find your volume control is too sensitive, or the higher setting if you need more headroom for less efficient speakers.
Yes, the SA-90 is designed to handle both 4-ohm and 8-ohm loads. It delivers 90W into 8 ohms and up to 200W into 4 ohms, providing plenty of power for a wide range of bookshelf and floorstanding speakers.
Yes, each unit is equipped with an advanced speaker protection system. This circuitry monitors the output to prevent damage to your speakers in the event of a fault or power surge.
No, the SA-90 is not bridgeable. These units are intended to be used as a dedicated stereo pair, with one amplifier powering each individual speaker.
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