KRELL KRS-200
¥ 3,100,000 (1 set of 2, released in 1987)
Commentary
A high-power class A monaural power amplifier ranked at the top of the KRS (Kroell Reference Standard) series.
An orthodox pure A class circuit is used for the circuit system.
Since heat generation is a problem in A-class circuits, a cooling fan is generally used in high power class A amplifiers. However, in order to completely eliminate noise generated by the fan, the cooling fan is eliminated in the KRS 200 and cooling is performed by natural convection.
In the KRS 200, a balance circuit is also introduced into the pure A class circuit, and a control amplifier with a balance output can be connected directly to the balance.
A total of 24 power transistors and 8 power MOS-FETs are applied to the output stage to realize high power for ultra-low load of 1 Ω.
The power supply consists of two separate power transformers, one for the positive power transformer and the other for the negative power transformer, each equipped with a 1.8 kva heavyweight transformer, and six power capacitors with a capacity of 40,000 μ F, for a total capacity of 240,000 μ F.
Model Rating
| Type | Monaural power amplifier |
| Rated Output (20 Hz to 20 kHz, Continuous) | 200W (8 Ω) 400W (4 Ω) 800W (2 Ω) 1,200W or More (1 Ω) |
| Input Sensitivity / Impedance | + 4dB/47k Ω |
| Total harmonic distortion factor | 0.05% or Less (20 Hz to 20 kHz, 1W to Rated Output) |
| Frequency characteristic | DC ~ 100 kHz -0.1 dB (1W, 8 Ω) |
| Signal-to-noise ratio | 100dB |
| Damping factor | 300 or higher |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 1,050W (per vehicle at idle) |
| External dimensions | Width 565x Height 305x Depth 770 mm |
| Weight | Approx. 80.7 kg |
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