KrellFPB-600usedKrell FPB-600 Power AmplifierKRELL FPB 600 2 CHANNEL POWER AMPLIFIER 600 WATTS 8 OHMS THIS IS THE "AMP" OF AMPS! EXCELLENT EXCELLENT CONDITION COSMETICALLY! WORKING PERFECTLY COMES WITH POWER CORD, SERVICE M...4250.00

Krell FPB-600 Power Amplifier

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Condition
9/10
Payment methods
Ships fromOmagh, Tyrone, BT78 1QZ
Ships toWorldwide
Package dimensions25.6" × 19.0" × 10.2" (180.0 lbs.)
Shipping carriersUSPS, UPS or FedEx
Shipping costFree
Original accessoriesBox, Manual
AverageResearch Pricing

KRELL FPB 600

2 CHANNEL POWER AMPLIFIER

600 WATTS 8 OHMS

THIS IS THE "AMP" OF AMPS!

EXCELLENT EXCELLENT CONDITION COSMETICALLY!

WORKING PERFECTLY

COMES WITH POWER CORD, SERVICE MANUAL, ORIGINAL BOX

Specifications:

Full Power Balanced 600

FPB 600
20 Hz - 20 kHz
+0.0, -0.05 dB
0.1 Hz - 240 kHz
+0.0, -3.0 dB

Gain 26.4 dB

Distortion :
1 kHz 0.02% 20 kHz 0.15%

Input Sensitivity
3.39 Vrms
Input Impedance
100 Kohms

Output Voltage
Peak, to Peak Peak to Peak
240 V
RMS 84 V

Output Power,
Each Channel Driven
8 Ohms 600 W
4 Ohms 1200 W
2 Ohms 2400 W

Power Consumption
standby 85watts
idol 430watts
max. 6000 watts

Krell's FPB 600 is not a simple amplifier. A number of philosophies and technologies have been brought together in its design. On the assumption that engineering has the potential to make a better-sounding product, consider the following:
The output stages of the FPB 600 have fully regulated power supplies—probably the world's first at this high a power level.
Regulation means that there is an active electronic filter/stabilizer isolating the power amplifier proper from the raw, rectified, and capacitor-smoothed power lines.
The latter, in addition to suffering from a series of ripple harmonics, carry a proportion of wideband electrical noise from the wall socket supply—hence, undeniably, the wide world outside—plus internal switching noise from the rectifiers.
Even under static conditions, an unregulated power supply has some degree of low-frequency wavering due to the demands made by other users.
While amplifier circuits are generally designed to be relatively immune to these interferences, some still make it through.
A standard unregulated supply will also vary in voltage according to the current demand imposed on the amplifier by the loudspeaker, this property called "regulation."
Even with a massive transformer and huge reservoir capacitors, there will be significant loss of regulation.
The resulting bounce on the internal power rails can induce additional signal-related, correlated modulations which generally impair subjective aspects such as dynamics and rhythm.
In my opinion, it's no coincidence that some of the most rhythmically convincing smaller amplifiers—for example, the Naim NAP250 and its bigger brother, the monoblock NAP135—have fully regulated output stages.
Adding full regulation to a power amplifier requires almost a doubling of complexity, since the supply regulator needs to be as powerful, as fast, and as "good-sounding" as the amplifier circuit it serves.
In a good amplifier, supply regulation has the ability to stabilize all the operating points, and to remove most self-induced noises from the supply and from the other amplifier channel (if present).
Ideally, this benefits dynamic truthfulness, clarity, low-level silence, purity, rhythm, and bass neutrality. The amplifier's rated performance will also be maintained regardless of local voltage and frequency variations.

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