Audio Research
Audio Research LS9
Best solid-state preamplifier for audiophiles seeking precise, high-fidelity sound control.
Experience precision audio with the Audio Research LS9 line-stage preamplifier. This all-solid-state unit features a pure Class A gain circuit and a direct-coupled output for exceptional clarity. Enjoy versatile connectivity with balanced and single-ended inputs, plus a tape monitor loop. The LS9 offers comprehensive IR remote control for seamless operation. Housed in an elegant, slim chassis, this professionally restored preamplifier is in excellent condition and includes its original packaging, making it a superb addition to any high-fidelity system.
$1399.00
Owner Satisfaction
4.6
/ 5
Category Rank
102
/ 272
#102 in Signal Processors
Price vs Category Average
-91%
Below average
Frequency Response
0.50.230
/ ±dB from Hz - kHz
Who it's for
- Audiophiles seeking a rich, immersive, and classic sonic signature
- Collectors valuing long-term reliability and high-quality component construction
- System builders needing flexible balanced and single-ended connectivity
Who should skip it
- Budget-conscious listeners wary of ongoing tube maintenance expenses
- Impatient users wanting instant, cool-running audio performance
- Modernists requiring digital displays and comprehensive remote control functionality
Performance breakdown
Signal Transparency
Class A circuitry ensures an exceptionally clean and uncolored audio path.
Volume Precision
The 70-step electronic relay system offers granular, repeatable level control.
Connectivity Versatility
Balanced and single-ended inputs accommodate a wide range of source components.
Noise Floor
The 100dB signal-to-noise ratio keeps background interference virtually non-existent.
Operational Convenience
Full IR remote integration makes modern system management effortless and intuitive.
Build Integrity
Professional restoration ensures this classic unit performs like a new component.
Key Specs
Frequency Response
±0.5dB from 0.2Hz - 30kHz
Total Harmonic Distortion (THD)
Less than 0.005% at 2V RMS balanced output
Main Output Gain
12dB (factory adjustable up to 18dB)
Input Impedance
100K ohms Balanced, 50K ohms Single-Ended
Output Impedance
500 ohms Balanced, 250 ohms Single-Ended
Dimensions
19" W x 3½" H x 11" D
Maximum Continuous Power Consumption
20 watts
Signal-to-Noise Ratio
100dB below 2V RMS output (IHF weighted)
Features
- Solid-state Class A gain circuit
- Full IR remote control
- Direct-coupled output path
- Balanced and single-ended inputs
- 70-step electronic relay volume
- Automatic warm-up mute
- Professionally restored condition
- Includes original box
What customers say
The Audio Research LS9 is celebrated for delivering the signature ARC sound, offering exceptional musicality. Owners consistently praise the tube stage for imparting desirable warmth and richness while maintaining critical detail and dynamic punch. This preamplifier creates an expansive, three-dimensional soundstage that makes listening deeply immersive. Build quality is robust and reliable, supporting its strong resale value. The LS9 successfully bridges classic tube character with modern clarity. It provides a sophisticated, refined performance that elevates source material, proving to be a highly effective line stage component punching above its price point for serious listeners.
Know before you buy
This LS9 has been serviced by a qualified technician to ensure all internal components meet original factory specifications. It has been tested for electrical stability and performance, ensuring it operates as reliably as it did when first manufactured.
Yes, the main output gain is factory adjustable from the standard 12dB up to 18dB. This allows you to better match the preamplifier's output level with the sensitivity of your specific power amplifier.
Unlike traditional potentiometers that can wear out or introduce noise over time, the relay-based system uses high-quality resistors to adjust volume. This ensures perfect channel balance and maintains signal purity across the entire volume range.
No, the feature is fully automated. When you power on the unit, it remains muted for a short period to allow the internal circuits to stabilize, preventing any unwanted pops or transients from reaching your speakers.
Yes, the LS9 is designed with both balanced (XLR) and single-ended (RCA) inputs. This makes it highly versatile for integrating into systems that use a mix of professional and consumer-grade audio equipment.
The direct-coupled output eliminates the need for output coupling capacitors in the signal path. This design choice minimizes phase shift and distortion, resulting in a more transparent and accurate sound reproduction.
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$1399