Krell Illusion II Preamplifier Technical Specifications

Krell_Illusion_II_Preamplifier_Rear

Analog Inputs
2 pr. balanced via XLR connectors
3 pr. single-ended via RCA connectors

Digital Inputs
1 AES/EBU via XLR connector
2 coaxial via RCA connectors
2 optical via Toslink connectors

Main outputs
1 pr. balanced via XLR connectors
1 pr. single-ended via RCA connectors

Headphone output
1 via 3-conductor 6.35 mm (1/4 inch) connector

Control inputs
1 RS-232 input via a 9-pin D-subminiature connector
1 remote IR detector input via a 3-conductor 3.5 mm connector
1 12 VDC trigger input via 2-conductor 3.5 mm connector

Control outputs
2 individually programmable 12 VDC trigger outputs via 2-conductor 3.5mm connectors (30 mA maximum per output)

Input impedance
Balanced: 40kΩ
Single-ended 20kΩ

Output impedance
Balanced: 310 Ω
Single-ended: 155 Ω
Headphone: <3.0Ω

Frequency response
20 Hz to 20 kHz +0, -0.02 dB
0.25 Hz to 1.2 MHz +0, -3 dB

Total harmonic distortion plus noise
Balanced Output: <0.003%, 20 Hz to 20 kHz, at 4.0 V RMS
Headphone: <0.09%, 20 Hz to 20 kHz, 2.0 V RMS, 32 Ω load

Gain
Balanced: 12.0 dB
6 dB (single-ended output)
Single-ended: 6.0 dB
Headphone: 5.1 dB with 32 Ω load

Volume control
Current mode, 12-bit, discrete R-2R ladder

Input overload
> 7.0 V RMS balanced or single-ended
Krell Illusion II Preamplifier Front
Output overload
Balanced: >16 V RMS
Single-ended: >8.0 V RMS
Headphone: >3.0 V RMS, 32 Ω load

Signal-to-noise ratio
100 dB wideband, unweighted
107 dB ”A”-weighted, both referred to 4.0 V RMS balanced

Power consumption
Standby: <2 Watts
Power on: 40 Watts

Dimensions
Preamplifier only:
17.3 in.W x 3.8 in. H x 18.3 in. D
43.8 cm W x 9.7 cm H x 46.4 cm D

Weight
Shipped: 38 lbs., 17.2 kg
Preamplifier only: 23 lbs., 10.4 kg