Metrum Forte-B Amplifier, black



Metrum Forte-B Amplifier

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4 939,05 €

4 939,05 € tax excl.***

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For a long time Metrum Acoustics has used hybrid (triode) amps for pleasure listening and critical evaluations. What we did not like was the fact that triodes suffer aging problems. In simulation software, we started to simulate triodes with fets instead. The good thing with triodes is their low gain and a lot of bandwidth without any need for feedback. As a result we realized a full class A high voltage fet circuitry having the right gain ,very good open loop bandwidth  and low noise figures. A similarity is the high voltage of 350 Volts to get this circuit running. As a result an amazing linearity without any feedback was realized. From this point the circuit  is driving a class A/B output section (10 watts in class A). Some little feedback is necessary to get the right gain but also improves the damping factor at the same time . Compared to our old hybrids, there’s no sonic difference, just less noise and lower distortion.

After two years of prototyping and testing, we’ve now turned this into a commercial product. The circuits are quite over-dimensioned to be sure that no errors occurs. Still we added  a lot of protection to avoid any damage to your loudspeakers in case of malfunction. A soft start procedure is added to charge the amazing capacity of 176000µF. This huge capacity is available during complex and dynamic transients. As known hybrids combine tube sound and amazing control as realized by transistor designs. Here you have the solution. The “Forte”  power amplifier will serve you without  problems as known with normal hybrids but still having the holographic sound as known from good tube designs. The Forte is an addition to our awarded Adagio digital amplifier.

Additional information

Weight18 kg
Voltage & Color

110V Silver Line, 110V Black Line, 230V Silver Line, 230V Black Line



50 Watt to 8 Ohm, 100 Watt to 4 Ohm, 170 Watt to 2 Ohm
Class A/B, 10 Watt Class A

Distortion 0.03% THD

Damping Factor 200

110/115V AC 220/230V AC 60/50Hz

Output Noise 300 µV RMS

Frequency Response 10-60.000 Hz – 3DB

Slew Rate 50V / µSec

Input Impedance RCA 15 KOhm, XLR 60 KOhm

Input Sensitivity RCA 240 mV RMS for 1 Watt, 1.75 V for 50 Watt, XLR 480 mV RMS for 1 Watt, XLR 480 mV RMS for 1 Watt, 3.5 V for 50 Watt

Max Power 400 Watt

Main Voltage 110/115V AC, 220/230V, 60/50Hz


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Metrum Forte-B Amplifier, black

Metrum Forte-B Amplifier, black

Metrum Forte-B Amplifier