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Amplifier The SANER-ALWIS composite feedforward amplifiers are based on a single instrumentation amplifier. The precision and speed of this amplifier stage is likely to be vanished by complex and large “transistor-arrays”. Thus, to avoid long signal runs this stage is placed close to the high current monolithic amplifiers1). |
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Its complementary class AB output stages provide superior performance with fast slew rates and low harmonic distortions. All drivers are driven by "push-pull" topology which eliminates the common ground for the speakers. The composite feedforward amplifiers for the middle/high frequency section deliver 100/60W (sin). |
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For the powerfull B-446 Monitor with a linear frequency response down to 30 Hz we left traditional routines. The bass drivers are driven below their resonance frequency leaving all complex and troublesome impedances behind. This "Acoustic Suspension" strategy also allows to supervise the membrane movement by feedforward control. By physical means this design is far ahead of "bass reflex" concepts, however it can only be realised with active loudspeaker concepts, since the electronics need to be adapted. The power of the low frequency section is rated at 200W (sin). |
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1) The choice of output transistors goes with our gainwiring™ concept. We are not surprised that these devices found applications in products from leading high-end manufacturers. They describe these transistors as follows: “Intelligent
Power Transistor with Gain” configuration in place of standard output
transistors to provide unprecedented audio performance, stability, and
reliability virtually impossible to achieve with conventional discrete
components.
These
integrated power output devices, or transistors, despite greater cost in
comparison to their more commonly used discrete transistor counterparts,
occupy very little circuit “real estate,” dramatically reducing
capacitive and dielectric storage effects, as well as simplifying the
overall signal path.
Because of these lower capacitive and dielectric effects, open-loop
bandwidth is approximately ten times greater than comparable discrete
circuit designs and mid and high frequency distortion is lowered an order
of magnitude while output impedance is also lowered dramatically,
resulting in a much more accurate and musical presentation. Jeff Rowland Design Group 2003 |
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