Preamplifiers
What are the differences between the different preamplifier models?
Although all Riviera preamplifier models are built on the same circuit concept, they differ in the refinement of the solutions applied to the circuit, as found in the more sophisticated power supplies in our higher level models, and in the quality of the input and output transformers.
Are Riviera preamplifiers balanced?
The circuitry of all Riviera preamplifiers is unbalanced by nature (asymmetrical like the human ear), but all Riviera amplifiers guarantee a ‘truly’ balanced signal transfer thanks to the use of balanced/unbalanced transformers at the input.
Are Riviera preamplifiers suitable for multi-amplification?
Yes, they all have multiple outputs and both unbalanced and balanced outputs are always active. All outputs also have the same output voltage so they can be used together.
Integrated Amplifiers
What are the differences between the AIC10Bal and LEVANTE integrated amplifiers?
Apart from the different power supplies and input options, the two integrated amplifiers differ essentially in the first amplification (voltage) stage, which is a single triode in the AIC10Bal while the LEVANTE uses a Totem Pole circuit. The power stage utilises a conceptually similar circuit for both, albeit with different specifications, given that it must supply 10W in class A for the AIC10Bal and 30W in class A or 120W in class AB for the LEVANTE.
Why is the AIC10Bal designated a ‘headphone amplifier’ while the LEVANTE does not specify a particular use?
Despite the similarity in circuit structure, the AIC10Bal has features that make it more ‘specialised’ for headphone listening. Specifically, the AIC10Bal is equipped with unbalanced and balanced headphone outputs, allowing for use with cables featuring balanced connectors. Additionally, it features an attenuation selector on the headphone output, enabling optimisation of the coupling with headphones of varying sensitivities.
How do I switch between Class A and Class AB on the LEVANTE?
At any time, even during listening, the operating class of the LEVANTE can be changed by turning the front panel knob. When changing operating class, the amplifier will automatically go into ‘mute’ mode, the LED will flash for a few seconds while the internal switching of the power supply takes place, after which it will automatically return to normal operation in the chosen class.
The AIC10Bal is a headphone integrated amplifier; why is it also equipped with a speaker output?
The AIC10Bal boasts an output power of 10 Wrms into 8 ohms per channel in Class A, which doubles when the impedance is halved (around 2o Wrms into 4 ohms and 35 Wrms into 2 ohms). This makes it a perfect match for those who do not require very high listening levels but still demand high sound quality. It is particularly well-suited for medium-high and high-efficiency loudspeakers.
Are the AIC10Bal and the LEVANTE balanced amplifiers?
The circuitry of all Riviera amplifiers is unbalanced by nature (asymmetrical like the human ear) but all Riviera amplifiers guarantee a ‘truly’ balanced signal transfer thanks to the use of balanced/unbalanced transformers at the input.
Power Amplifiers
Can both balanced and unbalanced inputs be used simultaneously?
Absolutely NOT: you should only use one input at a time. Because the two inputs are always connected, the switch on the rear panel is used to ground the negative or leave it floating (for balanced connection). NEVER leave the two inputs of the amplifier connected at the same time.
Are Riviera amplifiers balanced?
The circuitry of all Riviera amplifiers is unbalanced by nature (asymmetrical like the human ear), but all Riviera amplifiers guarantee a ‘truly’ balanced signal transfer thanks to the use of unbalanced transformers at the input.
Is it necessary to use four mono (or two stereo) amplifiers of equal power to biamp?
It is advisable, but not essential, as many Riviera amplifiers have very similar input sensitivity and gain. For example, it is possible to use 100W and 50W amplifiers in combination.
