■80 W + 80 W. More Power, and Greater Dynamic Range via UHC Ultra High Current Single Push-Pull Circuitry
A high-current UHC-MOS amplification device has been used to boost the power supplied to the UHC single push-pull circuit- ry. This is an innovative design by DENON that finally resolves the conflicting problem of how to produce a solid capacity to drive the speakers while preserving the delicate details of the music. The PMA-2000R provides 80 watts per channel into
8 ohms with nearly double that into 4 ohms to drive virtually any speaker system. Superior current linearity ensures a stable supply of current to the speakers, bringing out all of the dynam- ic range irrespective of impedance or efficiency.
■The UHC-MOS High-Current Amplification Device
To obtain the ability to bring out all the delicate nuances of sound and the need for dynamic speaker drive, the PMA-2000R has adopted a high-current UHC-MOS amplifi- cation device capable of delivering a peak current of 120A to the output stage, as much as 3~10 times greater than that of conventional MOS-FET devices. The current supply capacity of the UHC-MOS has been improved to exceed even that of bipolar transistors while preserving the high-quality sound of MOS-FETs. This ideal amplification device also incorporates single push-pull technology to eliminate variations in amplifi- cation operation.
Comparison of single push-pull output current characteristics
(Source: DENON)
■Leakage Canceling Dual Power Transformers
The PMA-2000R features dual parallel-connected twin trans- formers with vastly improved characteristics in the magnetic and coiled wire circuits as originally developed for the DENON POA-S1 monaural power amp. The transformers have also been “leakage canceling” (L.C.) mounted in order to eliminate mutual interference caused by magnetic fields and other factors. As a result, leakage flux from the power transformers, a potential source of noise, is suppressed to a minimum, enabling the PMA-2000R’s power supply section to supply clean, high-quality DC energy to the output stages.
Comparison of transformer leakage flux
(Source: DENON)
Two LC mounted transformers Two transformers positioned at same polarity
