Κώστας Φ.
Truth hurts. Here's a teddy bear.
- Μηνύματα
- 8.978
- Reaction score
- 895
Monoblock τελικοί απο την Kharma, Class-D (δε φταίω εγώ, το 6moons :happy_5: ), με 100Watt στα 8Ω και 150Watt στα 4Ω. Έχουν ως βάση τα UcD modules (βλ. Hypex) και κοστίζουν $6800 το ζευγάρι.
Επίσης η Kharma διαθέτει και μεγαλύτερο μοντέλο, τον MP 350.
Αντιγράφω απο το review του 6moons:
"When Charles van Oosterum contemplated the various assets and liabilities of Class D topologies, he went to the well and hired Bruno Putzeys. Belgium-born Putzeys worked at Philips' Applied Technology laboratory on digital and analog-controlled Class D amplifiers. Here he designed the UcD circuit that he now exploits in his own company Hypex. The collaboration between Charles and Bruno led to the birth of Kharma's Matrix MP150 Class D monoblocks.
One of the design goals was to develop an amplifier that would offer the same characteristics as a SET tube amplifier but with the added distinction of being a Class D amp. Bruno Putzeys claims to be able to bend the sound of any Class of amplifier, be it A, A/B or D, to his will. Thus the MP150 was made to sound like a tube amp in the mid and high frequencies. Where many early Class D designs were found to sound very different from preexisting amplifiers, this was basically due to the new ways in which they distorted. Later designs fixed the problem and left early admirers and adopters in doubt.
Kharma's website has a couple of graphs for their monos, showing a very flat frequency response, essentially a straight line from 20Hz to just before 20KHz where is gently slopes down. With a 100-watt power output at 8 ohms and 150 at 4, these amplifiers have plenty of power to drive almost any decent loudspeaker. The documentation further states that the design only takes feedback from the speaker terminals for its pulse control and not from the switching outputs. This creates low output impedance to give the MP150 a damping factor of more than 400 up to 2000Hz, maintaining better than 100 at 20kHz. Combined with a rated frequency response of DC to 50kHz (0,-3dB) and a THD and IMD of less than 0.02% make for some rather impressive figures. Jitter problems in Class D topologies are here controlled by eliminating a separate oscillator altogether and using self oscillation based on the phase shift of the feedback network.
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Conclusion
In conclusion, the cooperation between Bruno Putzeys' technical excellence and Charles van Oosterum's pushing the audio boundaries birthed a very competitive amplifier. Without any effort, the MP150 will challenge and defeat many far more expensive SET and solid-state power amplifiers. On top of that, the MP150 makes the choice between tube and a transistor amplifier easy. It's neither, really, since Class D in this special Kharma rendition combines the very best features of both into a couple of very musical bricks indeed."
Full Review
