Audio Research
Audio Research SP-15 Hybrid Tube Preamplifier
Best hybrid preamplifier for serious vinyl enthusiasts seeking reference-grade sonic clarity.
Experience the best of both worlds with the Audio Research SP-15, a distinguished hybrid preamplifier from the '90s. It masterfully blends the precision of a solid-state line stage with the warm, musicality of three 6DJ8 tubes in its phono section. This unit delivers captivating sound, characterized by surgical clarity and a rich tube soul, boasting exceptionally low distortion and a remarkably quiet noise floor. Its versatile, onboard phono stage is fully adjustable for various cartridges, offering dynamic, uncolored performance. Built with Audio Research's signature quality, the SP-15 features balanced outputs and comprehensive controls, making it a reference-grade component for serious vinyl enthusiasts.
$2999.00
Owner Satisfaction
4.7
/ 5
Category Rank
133
/ 473
#133 in Phono Preamps
Price vs Category Average
-56%
Below average
Tube Complement
36888
/ () DJ/ECC
Who it's for
- Collectors valuing long-term durability and robust engineering
- Audiophiles seeking classic, transparent, and musical sound reproduction
- Vinyl collectors needing a versatile, high-performance phono stage
Who should skip it
- Listeners who prioritize modern remote control and digital convenience
- Buyers wanting a plug-and-play experience without restoration costs
- Users preferring low-maintenance gear without recurring tube expenses
Performance breakdown
Phono Stage Versatility
Selectable impedance settings accommodate a vast range of high-end cartridges.
Sonic Transparency
Hybrid architecture delivers surgical clarity without sacrificing essential musical warmth.
Noise Floor Performance
Exceptionally quiet operation reveals micro-details often lost in lesser preamps.
Build Integrity
Dual-chassis construction minimizes interference for a reference-grade listening experience.
Dynamic Range
Wide frequency response ensures effortless handling of complex, demanding musical passages.
Connectivity Options
Balanced XLR outputs provide professional-grade integration for modern high-fidelity systems.
Key Specs
Tube Complement
(3) 6DJ8/ECC88
Frequency Response (High Level)
±1dB 0.2Hz to 100kHz
Harmonic Distortion (THD)
Less than 0.005% at 2V RMS output
Phono Input Impedance
Selectable 47K, 100, 30, 10, 3 ohms
Net Weight (Total)
29 lbs (13.2 kg)
Dimensions (Each Chassis)
19" W x 5 ¼" H x 10 ¼" D
Rated Output
2V RMS 1Hz to 100kHz
Power Consumption
130 Watts maximum
Features
- Hybrid design: solid-state line stage meets tube phono stage
- Highly regarded, dynamic, uncolored onboard phono stage
- Adjustable phono impedance for cartridge compatibility
- Full-featured controls with quiet attenuator switch
- High-quality balanced XLR outputs
- Dual chassis design for optimal performance
- 25Hz Hi-pass subsonic filter for phono
- Exceptional low noise floor and wide frequency response
What customers say
Owners consistently praise the SP 15 for its exceptional sonic purity and robust build quality. Reviewers highlight its ability to deliver a wide, detailed soundstage, making it a benchmark component in high fidelity systems. The hybrid design successfully blends the warmth of tubes with solid state precision, offering a refined listening experience. While it represents a significant investment, the enduring quality and musicality justify the premium price for serious audiophiles seeking long term performance. This unit offers a truly superior listening experience.
Know before you buy
The hybrid design combines a solid-state line stage for precision and low distortion with a tube-based phono stage. This gives you the clean, accurate signal path required for modern components while retaining the warmth and harmonic richness associated with 6DJ8 vacuum tubes.
The SP-15 is highly versatile, featuring selectable phono input impedance settings of 47k, 100, 30, 10, and 3 ohms. This range allows you to fine-tune the loading to match most moving magnet and moving coil cartridges accurately.
Yes, the SP-15 utilizes a dual-chassis construction to isolate sensitive audio circuitry from the power supply, which helps achieve its exceptionally low noise floor. You will need enough shelf space to accommodate two separate units, each measuring 19 inches wide.
Absolutely. The SP-15 is equipped with high-quality balanced XLR outputs, allowing for a clean, noise-resistant connection to professional or high-end power amplifiers.
The 25Hz hi-pass filter is designed to remove low-frequency rumble often caused by warped records or tonearm resonance. Engaging this filter helps protect your speakers from excessive woofer excursion and cleans up the overall sound profile.
The unit uses three 6DJ8/ECC88 tubes. While these are common and reliable, they are consumable components that will eventually require replacement to maintain the preamp's optimal frequency response and low distortion levels.
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$2999