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Usher Audio 6381 6371 6311 X-616 Centre X Series X-719 X-718 X-708 X-616 Centre V Series: V-601 V-602 V-603 Centre V-604 Usher Series: S-520 S-520S S-525 Centre SubWoofers: SW-103 Pre Amplifiers: P-307A Power Amplifiers: R 1.5 Class A R 6.0 Class A Accessories CD-1 CD Player DV-9 6.1 Processor RWS-729 Stand RWS-708 Stand Partington X Stand HiFi Rack |
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Usher R1.5 Class "A" Power Amplifier |
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The Usher Audio R1.5 power amplifier measures 48x48x22.5cm and its mass is a huge 40Kg.
To deliver its full 150watts Rms, It requires 1.6volts signal level. Usher
Audio have also biased this amplifier in pure class "A" mode.
Because of the size of the power supply and the ultimate stability of the unit being able to deliver upto 75 amps of current, this amplifier will drive just about all of the lowest impedance loudspeakers in the world with ease. Just as Rolls Royce, the power this amp supplies could be described as "more than adequate". Furthermore this amplifier has been built to last evidenced by the superlative build quality. From the 40 output devices to the very well built mains transformer this amplifier reeks of overkill. This quality is not restricted to the internal components as the rear panel sports some of the best binding posts we have ever seen.
Sound quality is again without peer at the price point of 1400UKP as the amplifier displays very little of its own character. The equipment displays an extremely wide stereo image with some of the tightest bass reproduction, although bass extension is not curtailed, rather this is a full bodied power amplifier which deserves the finest ancillaries.
If this amplifier is installed with care it can deliver a huge stereo sound stage with pace and detail. Aesthetics have not been sacrificed to performance, as is the norm in the industry. From its large grab handles to its enormous heatsinks, essential to keep the amplifier cool, this is a big amplifier. With a service organisation second to none Usher Audio have indeed got it right.
In the 1st UK review Hi Fi World loved the amp giving it 5 globes and a superb write up (PDF).
What Hi Fi also awarded the Power amp 5 stars and rated it very highly.
| Technical Specification | |
| Input Sensitivity | 1.6v for full rated output |
| input Impedance | 67 kohms |
| Slew rate | up to 40v/us |
| Power supply at 4 ohms | up to 16 amps |
| Instantaneous current supply | up to 75 amps |
| Signal to noise ratio | < 100dB |
| Power Consumption (idle) | 175watts |
| Power Consumption (full rated power @ 8ohms) | 720 watts |
| Power Output 20hz - 20Khz @8ohms | 150 watts RMS per channel (both channels driven) |
| Weight | 40Kgs |
| Dimensions | 480 x 480 x 225mm |
The Amplifier is available in RCA unblanced mode only, the XLR plugs to be found on the back of the amplifer are for the none UK non CE amp and are not conected.