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Features

With the Phantom Preamplifier, musicians appear silhouetted by the air about
them, filling the room with a mesmerizing depiction of the recording. Music
emanates from an expanse that outlines the recording venue, transporting you to
the moment of creation. Coupling advanced technologies and inspired design, the
Phantom preamplifier elevates preamplifier performance to an art form.

The Phantom preamplifier is the first Krell preamplifier to include an
optional crossover. The crossover functionality offers the ability to use a
subwoofer/satellite speaker arrangement and still maintain the highest quality
sonic performance. Previous to the Phantom preamplifier, this system
configuration would require signals to pass through a subwoofer's lower quality
crossover circuitry. The Phantom preamplifier is the centerpiece of a world
class audio system where space is at a premium.

Crossover Highlights

Owing to Krell's work in the Modulari Duo Reference loudspeaker, the unique
crossover feature is a highly sophisticated option. When the optional board is
present, additional crossover menu items become available. Definable parameters
include independently assignable crossover frequencies and filter types for the
high and low pass sections. Choices include 40Hz, 55Hz, 75Hz, and 100Hz
crossover points with 12dB, 24dB, and 48dB Butterworth or 24dB Linkwitz-Riley
style filters. The high pass section of the crossover uses the full Phantom
preamplifier circuitry for its output stage.

Circuitry Highlights

The Phantom 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 realized 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 the preamp, nor is it necessary. Open-loop
distortion is typically less than 0.003%. The volume control is realized with a
balanced resistor ladder - bandwidth and transient response of the preamp
circuitry are virtually unaffected by the volume setting.

Power Supply Highlights

The Phantom audio circuits receive power from a Krell Current Mode analog
power supply housed in its own dedicated chassis. The power supply avoids the
common integrated circuit topology used in many preamplifiers and instead mimics
the design topology of Krell Evolution e Series amplifiers. The circuitry is
completely discrete giving it the ability to respond quickly to current demands
and also be unaffected by all but the most severe AC voltage power fluctuations.
Oversized for a preamplifier, the power supply features a 290 VA transformer and
41,600μF of capacitance. Locating the power supply in its own chassis presents
the ideal configuration for isolating stray electrical and magnetic interference
from the critical preamplifier signal path. Capable of delivering current and
voltage swing for any musical event, the Phantom power supply is gentle on AC
requirements when not in use. A new eco-friendly design reduces standby power
draw to 2W.

The Phantom preamplifier is offered in diamond-cut silver or a luxurious
black finish.

제품 Specfications

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: 25 Ohms
Balanced: 40 k Ohms
Single-ended: 20 k Ohms

Output impedance
CAST: >1 M Ohms
Balanced: 250 Ohms
Single-ended: 125 Ohms

Gain
12 dB (CAST or balanced output)
6 dB (single-ended output)

Volume control
Balanced, current-mode,
16-bit, discrete R-2R ladder

Input overload
CAST: 12 mA RMS
Balanced: 10 V RMS
Single-ended: 6.5 V RMS

Output overload
CAST: 16 mA RMS
Balanced: 16 V RMS
Single-ended: 8 V RMS

Frequency response
20 Hz to 20 kHz +/- 0.02 dB
0.35 Hz to 720 kHz +0, -3 dB]

Total harmonic distortion plus noise
Balanced Output:
<0.003%, 20 Hz to 20 kHz, 4 V RMS or 4
mA RMS

Signal-to-noise ratio
4 V RMS balanced or 4 mA RMS
CAST output
Wideband, unweighted: >100 dB
"A" weighted: >109 dB

Transformers
290 VA (250 VA Analog / 40 VA Digital)

Capacitors
71,900 μF (41600 μF Analog / 30,300 μF Digital)

Power consumption
Standby: 2 W
Power on: 65 W
Power on, with KPE: 75 W

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
Power supply only:
17.3 in. W x 3.8 in. H x 17.7 in. D
43.8 cm W x 9.7 cm H x 44.8 cm D
Preamplifier and power supply:
17.3 in. W x 7.6 in. H x 18.3 in. D
43.8 cm W x 19.2 cm H x 46.4 cm D

Weight
Shipped: 61 lbs., 27.6 kg
Preamplifier only: 18 lbs., 8.1 kg
Power supply only: 28 lbs., 12.7 kg