Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded
Krell 302 Power Amp and Phantom II Preamp - As Traded

Krell 302 Power Amp and Phantom II Preamp - As Traded

$18,000.00

Krell 302 Power Amp and Phantom II Preamp - As Traded

Condition: Excellent

The Phantom II incorporates the advanced technologies and brilliant design of the Phantom preamplifier into a single chassis format. Often overlooked, the preamplifier is a critical component in the signal chain. A small signal must be carefully amplified without damaging the ephemeral staging and dimensional components of the music. Heard through the Phantom II, music fills a listening room with three dimensional imaging, tonal integrity, and staggering dynamics.

The Phantom II preamplifier is a dual monaural circuit design with the left and right channels afforded their own power supply regulation and individual full chassis sized boards. All signal gain is realised in surface mount topology using proprietary multiple-output current mirrors with nearly 500 times the open loop linearity of other designs 1.5 MHz open loop bandwidth in a zero feedback, balanced, Krell Current Mode design terminating in Krell CAST. A complete Krell system (source, preamp, and amplifier) system, connected using CAST interconnects reduces the number of voltage gain stages to the minimum, one. The resulting noise floor approaches the theoretical limit of technology. Negative feedback is not used anywhere in he preamp, nor is it necessary. Open-loop distortion is typically less than 0.003%. The volume control is realised with a balanced resistor ladder - bandwidth and transient response of the preamp circuitry are virtually unaffected by the volume setting.

Specifications

Inputs
2 pr. CAST via 4-pin bayonet connectors
2 pr. balanced via XLR connectors
3 pr. single-ended via RCA connectors
Tape input
1 pr. single-ended via RCA connector
Main outputs
2 pr. CAST via 4-pin bayonet connectors
1 pr. balanced via XLR connector
1 pr. single-ended via RCA connector
Tape outputs
1 pr. single-ended via RCA connector, buffered
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 3.5 mm connector
1 preamplifier link via an RJ-45 connector
Control outputs
2 individually programmable 12 VDC
trigger outputs via 3.5 mm connectors
1 preamplifier link via an RJ-45 connector
Power output
1 phono power output (+/-20 VDC) for KPE
via a 9-pin D-subminiature connector
Input impedance
CAST: 45 Ohms
Balanced: 95 k Ohms
Single-ended: 47.5 k Ohms
Output impedance
CAST: >1 M Ohms
Balanced: 50 Ohms
Single-ended: 25 Ohms
Gain
12 dB (CAST or balanced output)
6 dB (single-ended output)


Krell Evolution 302 Stereo Power Amplifier

Small profile package utilising huge internal heat sinks to support Class A, balanced, and Krell Current ModeTM topology
• Evolution CAST TM, voltage balanced, and single ended
inputs.
• Low feedback topology; only 8 dB of nested local feedback utilised. No global feedback is used.
• Push-pull output stage with 10 pair of ultra high speed, high current, output transistors• Push-pull driver stage configuration resembling a miniature output stage
This unique circuit actually powers the speaker load when the audio signal is at the zero-crossing point.
Notch distortion is effectively eliminated, maintaining the benefits of Class A operation with the efficiency of go away an A/B design.
• Massive 3 kW toroidal transformer, four 35 amp bridge rectifiers, and 110,000 microfarads of filter capacitance, ensure ample current under the most
demanding circumstances.
• A second low current transformer stabilises voltage for ultra-quiet operation.
• Internal high current line conditioning circuitry filters RF noise on the AC Mains and compensates for asymmetric power waveforms and DC on the AC Mains.
Protection circuitry continuously monitors all amplifier
operations

SPECIFICATIONS

FREQUENCY RESPONSE

20 Hz to 20 kHz +0, –0.10 dB <0.5 Hz to 180 kHz +0, –3 dB

SIGNAL-TO-NOISE RATIO

Wideband, unweighted, referred to full power output >107 dB
“A” weighted >117 dB

GAIN 25.5 dB

TOTAL HARMONIC DISTORTION
<0.02% at 1 kHz, at 300 W, 8 Ohms
<0.15% at 20 kHz, at 300 W, 8 Ohms

INPUT IMPEDANCE
Single-ended 100 kOhms
Balanced 200 kOhms
CAST 75 Ohms

INPUT SENSITIVITY
Single-ended or balanced 2.60 V rms
CAST 2.60 mA rms

OUTPUT POWER

All channels driven
300 W rms at 8 Ohms
600 W rms at 4 Ohms
1200 W rms at 2 Ohms

OUTPUT VOLTAGE
139 V peak-to-peak
49 V rms

OUTPUT CURRENT
35 A peak

SLEW RATE 120 V/ms 100 V/ms

OUTPUT IMPEDANCE

<0.040 Ohms at 20 Hz
<0.053 Ohms, 20 Hz to 20 kHz

DAMPING FACTOR
Referred to 8 Ohms >200 at 20 Hz
>150, 20 Hz to 20 kHz

POWER CONSUMPTION

Stand-by 150 W
Idle 320 W
Maximum 3400 W