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Photos and specs Amplifier Denon PMA-655R


  • Price: $500

  • Worth: respectable appearance, good sound

  • Limitations: relatively little power



Design. The entire apparatus - and the front panel, and a handle and housing cover - made in the same golden color. He looks respectable and not only fit into any decor, but also become its embellishment. Feature circuitry design - two transformers - large, providing work of the amplifier, and the little that supports power remote controller mode in stand-by. This allows you to "sleep" mode is completely disconnected from the power transformer core and reduce consumption. Catering to both channels one filter capacitor 8200 uF. Sources connected with the help of the electronic switch circuit, in which the keys are applied to CMOS transistors.

Functions. Having a separate record selector lets you listen to one source, and record the other. Possible to connect two recorders and dub from one to the other. However, only the recording selector switch on the front panel. Another original feature - switchable system loudness. As is known, the volume decreases with decreasing sensitivity of the human ear to the bass and treble, so their amplitude at low volume should be increased, and not to touch the voices provided loudness.

Control. The remote control is relatively small, but in addition the amplifier is capable of controlling audio complex and other components (CD/MD-player and cassette recorder, tuner presets choice), and for each unit use its own work area. Although almost all of the buttons (except volume control) of the same size, it does not cause nuisance, since they are located quite logical, and contrast risk volume knob makes it easy to define its position.

Sound. Nice soft sound gives low frequencies tenderness and depth, though sometimes does not allow to emphasize the nuances of choral singing. High frequencies are distinct, but without harshness. Tools on the stage located formed naturally and evenly. They do not interfere with each other, and each position is determined easily and accurately.
Phono input terminals covered with special plugs

Phono input terminals covered with special plugs




View from inside

View from inside




Remote Control

Remote Control




Measurements



Fig. 1. Frequency response function




Technical comment


Amp distortion at low levels are small (0.0038 % at 1 kHz), a little rise above 10 kHz, but also at the upper frequency of the operating range of the SOI is a record low - less than 0.01%. With increasing distortion power also increases. In the spectrum of the signal has intermodulation distortion, but their level does not exceed the level of harmonic distortion harmonics. Voices without a pronounced center frequency adjustment range of about ± 9 dB. But already at the maximum rise significantly rises and Mid level, so it is really a range of settings (for example, the rise otnositelno1 kHz) less. 3 dB roll off at a frequency of 147 kHz. Channel imbalance is large (about 1 dB), but it is easily removed control balance. Crosstalk average, about 63 dB. Signal/noise ratio is very interior ha (98 dB). However, low damping factor - 127, ie power demanding speakers.
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