Today’s AV receivers leave little to be desired: most of them now have seven power amplifiers on board, mastering all possible surround methods up to native HD sound and scaling even analogue video from PAL resolution to 1080p. So what is the difference between preamp and power stage?
If one separates the decoder precursor with its fine signals from the power amplifier with its large, high currents and large magnetic fields, one can basically increase the sound quality from a certain price class. The circuits can be optimally constructed with the space of two separate housings, thus compromising compromises and mutual interactions.
The second reason is the great flexibility: anyone can adjust decoder properties and power amplifiers to their needs. Why should someone pay for seven power amps when using only five?
Although the preamplifiers tested are relatively expensive, our grading for the amplifiers from mono-blocks to stereo-amps to the 10-channel power amplifier shows alternatives that make the budget flexible. In addition, the existing receivers usually allow a step-by-step setup.
With the controlled 5.1 and 7.1 outputs, many AV receivers can temporarily be converted to the preamp. So you can make the transition in two steps.
With the Vincent mono blocks or the stereo power amplifiers from Rotel it goes in even smaller steps. It is possible to delegate the two front channels to a stereo output stage or to two monos via pre-out and level compensation in the loudspeaker setup of the transient receiver, and to pull with the other channels if again more money in the box office
A waiver, however, requires all four precursors. The large calibers do not yet have the latest HDMI features on board: the looping of 3D video and an audio return channel.
On the have side, most separate preamplifiers and amplifiers require additional XLR sockets for interference-free symmetrical signal transmission, which is useful for large cable lengths. Normally RCA connections are more favorable and sound at least equally well. Finally, most pre-amplifiers and short amps showed better signal-to-noise ratios with RCR than with XLR.
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