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Preamplifiers — Audio Research LS28SE
Description, images, technical data and specifications
Audio Research LS28SE
Image source - (c) Audio Research
The Audio Research LS28SE is a tube-based preamplifier offering generous XLR and RCA connectivity plus a very wide rated bandwidth. It sits in the brand's preamplifier range outside the Reference line.
Key specs that matter
The back panel has eight inputs, four XLR and four RCA, and five outputs, three XLR and two RCA. Gain is 18.5 dB. Input impedance is 100,000 ohms on the XLR inputs and 50,000 ohms on the RCA inputs. Output impedance measures 600 ohms balanced and 300 ohms unbalanced. Rated bandwidth stretches from 0.4 Hz to 200,000 Hz, and distortion is below 0.007%. The chassis measures 480 x 137 x 348 mm and weighs 7.2 kg, which is compact for a tube design with this many connections.
Pairing
Thanks to connections in both formats, the LS28SE can serve a large system with several sources and several amplifiers, and it works with almost any combination of them.
Alternatives
Audio Research's Reference 6SE Line-Stage is a tube preamplifier from the brand's Reference line.
Key specs that matter
The back panel has eight inputs, four XLR and four RCA, and five outputs, three XLR and two RCA. Gain is 18.5 dB. Input impedance is 100,000 ohms on the XLR inputs and 50,000 ohms on the RCA inputs. Output impedance measures 600 ohms balanced and 300 ohms unbalanced. Rated bandwidth stretches from 0.4 Hz to 200,000 Hz, and distortion is below 0.007%. The chassis measures 480 x 137 x 348 mm and weighs 7.2 kg, which is compact for a tube design with this many connections.
Pairing
Thanks to connections in both formats, the LS28SE can serve a large system with several sources and several amplifiers, and it works with almost any combination of them.
Alternatives
Audio Research's Reference 6SE Line-Stage is a tube preamplifier from the brand's Reference line.
Specifications
Model name
LS28SE
Analog inputs (balanced)
4
Analog inputs (single-ended)
4
Analog outputs (balanced)
3
Analog outputs (single-ended)
2
Gain (dBu)
18.5
Input sensitivity (mV)
N/A
Output voltage (V)
N/A
Input impedance (balanced) (Ω)
100 000
Input impedance (single-ended) (Ω)
50 000
Output impedance (balanced) (Ω)
600
Output impedance (single-ended) (Ω)
300
Maximum output level (balanced) (dBu)
N/A
Maximum output level (single-ended) (dBu)
N/A
Volume control range (dBu)
N/A
Frequency response low +/- 3dB (Hz)
0.4
Frequency response high +/- 3dB (Hz)
200 000
Signal to Noise Ratio (SNR, unweighted) (dB)
N/A
Total Harmonic Distortion + Noise (THD+N) (%)
<0.007%
Dimensions (mm)
480 × 137 × 348
Weight (kg)
7.2
Official link
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