Musical Fidelity KW250s Integrated System

Here we have an impressive all-in-one unit from Musical Fidelity. The KW250S features a CD player, DAB & FM Tuner, Pre-Amplifier and dual mono Power Amplifier. Digital sources can be connected to take advantage of the on-board DAC and turntables too can be used as there is a MM/MC phono input. Our unit comes in very good condition after a couple of slight faults were found and fully rectified, and will be supplied in original factory packaging along with remote control unit, mains cable plus our regular three month warranty.
Musical Fidelity Say….
The KW250S is one of the most comprehensive fully integrated Hi-Fi designs ever made, and encloses the best elements out of all our separates into one convenient box.
The CD player has extremely low jitter, vanishingly low distortion, exemplary linearity and ultra-low noise. The tuner is designed to bring DAB into the realms of hi-fidelity sound reproduction to complement the very latest technology DAB/FM receiver circuit. Great attention has been paid to internal layout, isolating each circuit section to prevent possible interaction.
The CD, DAB and FM digital data streams are first upsampled to 192kHz, which moves noise, jitter and distortion artefacts well above the audio band. They are then passed through a new, low noise, low distortion 24-bit dual differential digital-to-analogue converter, which allows simpler filtering of the analogue output. This in turn gives an improved audio response without the need for sharp filters that degrade sound quality. The result is a CD player and DAB/FM tuner which has a smoother response than previously possible with none of the “hardness” of other units.
The preamplifier sections are our finely tuned and tweaked tube input line level preamplifier for smooth tube sound coupled with low noise and virtually no distortion. This also includes our top quality low noise phono stage which caters for both MM and MC cartridge users.
The power amplifier consists of two mono block amplifier modules with completely separate supplies for the absolute best in separation and imaging. Rated for 250W nominal they are enough to drive even the most demanding loudspeakers with ease. Low distortion and very quiet they will deliver all music types exactly as the artist originally intended! The resultant performance achieved by this unit is among the best in the world. It has excellent signal to noise ratio, low distortion, wide bandwidth, huge dynamic range, extraordinary resolution and fine detail.
Specifications:
CD:
Disc Mechanism: Philips
Total Correlated Jitter: < 135 pS
DAC:
DAC Circuits: 24 bit Delta-Sigma (Bit stream) dual differential 8x over sampling
Upsampling: 192 kHz
Total correlated jitter: < 135 pS
Linearity: < 0.1 dB down to -96 dB
Output Digital 0dB Level: 2.15 VRMS at 1 kHz nominal
Analogue Output Impedance: 47 Ohms
Frequency Response: 10 Hz to 20 kHz -0.2 dB max
Channel Separation: > 105 dB 20 Hz to 20 kHz
Signal / Noise Ratio: > 113 dB “A” weighted
Total Harmonic Distortion: < 0.003% 10 Hz to 20 kHz
TUNER:
DAB Specifications:
Supported DAB Modes: I, II, III, and IV VHF 174 240 MHz RF frequency range; L-Band (standard) 1452 1492 MHz
VHF Sensitivity: -96 -97 dBm
L-Band Sensitivity: -95 -96.5 dBm
L-band After Error Correction: -15 dBm Maximum Input Signal for Pseudo channel BER with real value 0.02
Band III After Error Correction: 0 dBm
Adjacent Channel Selectivity: 32 33 dBm
Far-off selectivity: 48 dBm
Acquisition sensitivity: 101 dBm
Input Impedance: 50 Ω F type connector (to VHF/L-Band diplexer)
FM Specifications:
RF Frequency Range: 87.5-108 MHz
RF Sensitivity (S+N)/N = 26 dB, 90 MHz @ 22.5 kHz: 5 µV Dev. F.mod = 1 kHz
RF Limiting Sensitivity: 0.5 µV
(S+N)/N Ultimate S/N Ratio: 63 dB (90 MHz @ 200 mV/22.5 kHz Dev. F.mod = 1 kHz)
THD: 0.5% (90 MHz @ 200 mV/75 kHz Dev. F.mod = 1 kHz)
Stereo Channel Separation: 30 dB
Output:
Power: 250 Watts per channel into 8 Ohms; 400 Watts per channel into 4 Ohms
Voltage, RMS: 45 Volts 20 Hz to 20 kHz
Voltage, Peak-to-Peak: 127.3 Volts
Current Peak-to-Peak: 75 Amps
Damping Factor: 140
Output Devices Per Channel: 4
Pre-Out Impedance: 50 Ohms
Line Inputs:
THD + Noise, 20 Hz to 20 kHz: < 0.01%
Signal / Noise Ratio: > 100 dB ‘A’-weighted
Input Sensitivity for 250 Watts: 330 mV
Input Impedance: 220 kOhms
Overload Margin: 26 dB
Channel Separation: > 70 dB typical
Frequency Response: 20 Hz to 20 kHz, +0, -0.2 dB
Phono Input:
Signal / Noise Ratio: > 96 dB ‘A’-weighted
Input Sensitivity: 2.5 mV (moving magnet)
Input Impedance: 47 kOhms
Overload Margin: 24 dB
Power requirement: 100 / 115 / 230 Volts AC 50 / 60Hz; 700 Watts maximum into 8 Ohms, 80 Watts idle
Dimensions: 485 (W) x 470 (D) x 170 (H) mm
Weight: 29.5 kg