SP4 vs Dynaco PAT-5a
The PAT-5a's signal-to-noise is 70 dB against the SP4's 84 dB, its thd 0.007% against 0.005%, and its mm gain 57 dB against 36 dB. Both share output voltage (2.0V RMS).
AI-generated product photo — not official manufacturer imagery.
AmplifiersPhono Pre-AmpsDiscontinued
Estimated price (community-sourced)
$371.09
Around — community and catalog average, updates slowly
About the SP4
The SP-4 stereo preamplifier was conceived and designed for audio perfectionists, utilizing Audio Research's proprietary 'Analog Module' circuitry to deliver increased musical depth, definition, and a smoothness that rivals vacuum tube designs. It offers a comprehensive set of features including dual pre-outs, dual phono inputs with a high-quality MM phono stage, tuner, dual auxiliary inputs, dual tape loops with monitoring and dubbing, tone controls, tone defeat, a stereo/mono reverse selector, and a subsonic filter. The SP-4 is renowned for its build quality, user-friendly controls, and engaging, musical sound. It is a full-function preamp, making it especially appealing to vinyl enthusiasts. The unit is housed in a walnut-veneered, oiled finish cabinet, reflecting its high-end pedigree and era of manufacture (1976–1977).
Specifications
Analog Output
Analog signal output specifications
- THD
- 0.005%
- SNR
- 84 dB
- Output Voltage
- 2.0V RMS
Phono Preamplifier
Phono stage specifications
- MM Gain
- 36 dB
Physical Dimensions
Size, weight, and appearance
- Dimensions
- 480 × 210 × 89 mm (W × H × D)
- Weight
- 5.5 kg (12 lbs)
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions