The Consonance Reference 1.3 is a preamplifier passive; more precisely, it is a unit with passive volume control able to vary in multiple steps, the output level of an audio system with high fidelity .
This scheme offers tangible improvements over all the previous patterns based on the attenuation of the resistive volume.
The Consonance R1.3 is capable of the utmost transparency, as is expected to face an attenuator passive, but besides this also provides the maximum possible dynamic range.
Many audiophiles were enchanted by the many shades of dynamics, which is capable of the R1.3 even at listening levels very low.
The difference compared to the common preamplifier expense based on the attenuation resistor is that the resistance deplete the signal, transforming it into heat, while the preamp Consonance R1.3 uses Transformer Volume Control: technically called the "TVC".
This system transforms the current into voltage (and not heat), with incremental steps up or down up to +6dB of gain (Gain).
The Consonance R1.3 is ideal in combination with our amplifiers power amplifiers-valve Cyber Mono.
Sources modern, like CD Players, DVD Players, Readers, SACD and others, and generally offer a level of output high enough to drive power amplifiers to full power (usually the output level is 2V RMS or greater).
Many CD Players, and similar devices, have an output impedance that is less than 1K Ohm, and still others have impedance values that are still lower.
Although the "pre-passive" may have initially attracted some interest as it is equipped with a method of volume control and input selection extremely pure level of sonic, in the time they have unfortunately gone gradually into oblivion, due to the impedances in the coupling does not correct with the sources.
This is easily explained with these examples:
If a volume control resistor 5K Ohm were used in a control unit in the passive, the source should handle all the time a major load of 5K Ohm. If this hypothetical preamplifier abbinassimo a source with an impedance of 1K Ohms, in the worst cases, the output impedance of this combination would be 1500 Ohm at an attenuation of -6dB, while to an attenuation of -20dB, the output impedance should still be about 540 Ohms. If finally completed it this chain by adding a load capacitance of about 1nF (value, easily seen in the signal cables high-capacity) here is that all of this would result in an attenuation of the final of 0.3 dB at 20KHz, in the case of a setting of attenuation of 20dB, practically reaching the maximum limit allowed for driving a capacitive load.
In the worst case of attenuation at 20KHz is still reached a value of 1dB!!! If, however, to facilitate the load represented by our source, the hypothetical, we use a volume control (resistive 50K Ohms, we should in any case accept drastically higher levels of roll off at 20KHz or we have to limit the load capacitance to less than 100pF. This capacitive level (100pF) is the value that measure of the best signal cables to a maximum length of 1 meter, and is often a value that is already passed from the same input capability of many amplifiers!
Accordingly, a control resistor of volume used in the control unit passive must deal with the given load from the source, leading to no major distortions and a high output impedance.
With the introduction of the volume control magnetic adopted in Consonance R1.3, is definitively surpassed this hurdle of technical difficulties, making possible the realization of a control unit a passive that is able to work much more efficiently and in a wide range of configurations and applications possible.
Reference 1.3 is a component from the high-performance with magnetic control of the volume. It consists of a transformer versatile, designed to be used with 23 different selectable positions, the transformer is housed inside of a shielding made of Mu-Metal (a special alloy magnetic with high magnetic permeability or μ, hence the name) with measuring 57.5 mm in diameter x 65mm in height, excluding the connectors.
The primary winding of the transformer has a resistance of about 200 Ohms. The same applies to the secondary winding. The inductive reactance of the primary at 20Hz it is in excess of 50K Ohms (400 H of Inductance in the Primary), and therefore an input impedance over 50K Ohm across the audio band if the load on the secondary is infinite.
The primary winding is controlled by a selector and is capable of a level of gain of 6dB when the output is set to the value of 0dB.
This is particularly useful in combination with amplifiers that are characterized by a number of stages reduced, and accordingly credited to a gain level lower than usual.
The secondary winding (output) offers a number of settings capable of the following values:
0 db, 3 db, 6 db, 8 db, 10 db, 12 db, 14 db, 16 db, 18 db, 20 db, 22 db, 24 db, 26 db, 28 db, 30 db, 32 db, 34 db, 40 db, 46 db.
Thanks to this variety of values provided by the preamp Consonance R1.3, the steps in volume are less than the minimum limit of the threshold of audibility (3dB), ensuring the adjustment is fine, the volume level, not accessible using the normal volume controls of the continuous type.
Functions : Gain, Input Select, Volume, Grounding
Harmonic distortion (for 2V RMS) : 0.005%(10Hz~100kHz)
Frequency response : (at-1dB) 10Hz-73kHz (0dB), 10Hz-65kHz(6dB)
Inputs : 3 groups (RCA), 1 group (XLR)
Outputs : 1 group (RCA), 1 group (XLR)
Gain at 1kHz : 0dB and +6dB switchable
Attenuation : -52dB
Dimensions: 430(L) x 160(d) x 100(h) mm
Weight : 10kg