The new MB-450 Signature monoblocks gain further sonic benefits with a shorter, faster and fully balanced negative feedback loop, with zero global negative feedback. The negative feedback loop completely eliminates ringing and requires no capacitor compensation to maintain critical phase integrity and information. The result is an amplifier that remains stable even under the most demanding loads.
Adjustable precision-regulated bias and screen supplies hold the output tube operating point constant even under AC and main power supply fluctuations, and stabilizes the critical power supplies yielding tonal stability and sonic integrity especially during complex, dynamic signal conditions.
Another new feature is a user adjustable Damping Factor feedback control that allows the user to adjust the amplifier’s output impedance by varying the amount of negative feedback. Impedance can now be precisely set to suit the listener’s taste, and to improve control of the loudspeaker loads to deliver best performance.
The 4 possible settings are:
Finally, the amplifier has been substantially re-voiced with premium Mundorf silver oil capacitors, for a sweeter, more extended top end and mid range tonality that sounds more relaxed, with better flow and integration. Input stage capacitors are also bypassed.
Even a brief listen to the new MB-450 Series III monoblock reveals the successful implementation of the new technology. The mid bass has more authority and control while the critical midrange exhibits a new effortlessness in reflecting the natural instrumental colors and timbres. This greater sense of ease and control of the critical mid bass and midrange area enables the top end to sound completely natural and unconstrained. The impact of the music’s broad brushstrokes is unmistakable, while at the same time, the listener enjoys the indelible intimacy and micro-dynamics that lay deep inside favorite recordings.
|Vacuum Tube Complement||8 x 6550 or KT-88, 1 x 12AT7, 1 x 12BH7|
20Hz – 20kHz <2.5% THD
|Tetrode: 425 Watts, Triode: 225 Watts
|Input sensitivity||Variable between 1-2V, depending upon DF setting|
|Output load range||4Ω – 8Ω|
|S/N ratio||450W Tetrode & 200W Triode: -110dB, 120Hz|
|Power consumption||Idle = 300W, Full power = 1000W|
|Primary mains fuse rating||100/120V = 15A Ceramic Slo Blo, 220/240V = 8A Ceramic Slo Blo|
|Input fuse||100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo|
|Logic fuse||100/120V = 1A Ceramic Slo Blo, 220/240V = 1A Ceramic Slo Blo|
|B+ fuse rating||Plate Fuse – 2.5A fast acting 600V, Screen Fuse – 0.75A fast acting 600V|
|Dimensions W x D x H||18.5 x 18 x 9 inches (47 x 45.7 x 23 cm)|
|Weight||93lbs (42kg) per monoblock unpacked, 110lbs (50kg) packed|