Il suo pre:
Six-channel feast for the aspiring foodie
Slim and affordable, the Rotel RB976
promises superior performance for a price not far beyond that of a
budget integrated amp
Rotel has a reputation for delivering value
for money products and this latest six-channel x 60W power amplifier
continues that fine tradition. It's an amp that's footprint-friendly. At
440(w) x 121(h) x 400(d)mm the case matches the width and depth of many
popular preamps/preceivers. Place one beneath your preamp and you have a
separates system that is no bigger than an integrated amplifier. (One
point on such stacking: Because this amplifier has no internal fans and
relies purely on free-flow ventilation of the internal heatsinks, Rotel
does not recommend you stack other equipment on top.)
Up front we see a main power button plus
input level controls for each pair of amplifiers. There are also bridged
mono and power indicators to show the mode of operation.
Around the back are three pairs of phono
terminals (input) and 4mm banana sockets (output). You also have three
groups of switches that determine how the amplification is configured:
choose 6 x channel operation or linked or bridged output.
The linked mode allows the stereo input for
one amplifier pair to be shared with either (or both) of the other pairs.
For example, in this mode, the rear feed from a Pro-Logic or Dolby
Digital preamp could drive an array of six speakers – three on each wall
– of a very large home cinema. The bridged mode allows a pair of
amplifiers to become a high-power (150W quoted) mono amp. It requires
different wiring. Instead of connecting your speaker to the regular plus
and minus terminals, you 'bridge' (hence the term) across the two
positive outputs of a stereo pair. The link switch also needs to be
engaged. In this mode, the right-hand input terminal is unused (the
input being fed to the left terminal).
Given the low cost I couldn't resist a peek
inside. The core of this amplifier is occupied by a single torroidial
transformer that supplies all channels. The construction quality is
If amplifiers were restaurants, this Rotel
would be a fast food joint – inexpensive but able to fill your belly
when it rumbles. But like other cut-price multi-channel power amps, it's
not at its best in pure stereo mode. Here, I found the sound quality
bland. My test CDs (Beethoven's 5th – Karajan – and Grieg Piano Concerto
– Katin) plodded along without real depth or warmth. It makes a sound,
yet lacks soul.
Pro-Logic programmes fared slightly better.
The skull crush in T2 was bright and brittle – but loud. Vocals
from Linda Hamilton were not the warm, lush, forward tones heard on the
very best power amps. They sounded drier, more clinical.
As always, amplifiers are only as good as
the source fed to the input. On Dolby Digital laser discs, this amp
sounded at its best. There was more sparkle on highs and the low
frequency 'slam' was well handled. Surprisingly, 60W into the Jamo sub
came up trumps.
I was amazed that the Rotel RB976 did not
compromise front-to-back separation – even with six channels occupying
the same cluttered circuit board. On Spy Hard the three seconds'
worth of helicopter noise (on the rear channels only) was delivered with
the same discrete separation as the most expensive amplifiers tested.
In summary, not a sonic revelation yet
excellent value for money. Just like your favourite burger bar, this amp
serves sonic sustenance for those starved of separates – and £375 is
Bob Tomalski, Home Cinema Choice, January
The manufacturer's spec of 60W per channel is only attainable if you can
accept high levels of harmonic distortion. A spectrum analysis at the
clipping point shows THD beyond 3% – not very nice. In the real world
this amp has a Fidelity Firewall of 48W. Otherwise a clean bill of
health with a level frequency response.
Manufacturers rated output : 60W/channel
HCC measured output at onset of clipping : 64W at 2.5% THD
HCC Fidelity Firewall : 48W at 0.01% THD
Frequency response : 25Hz-20KHz:+/- 0.1dB