Academy Audio Hi-End MUSES VCM Manuale d'uso - Pagina 11
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chip to the outputs. Some power-up pops and clicks are also possible. Therefore, using a muting relay is
highly recommended. Note, that the relay should be activated after about 1 sec of delay upon power-
up, and released immediately at power down. The Academy Audio MCU control boards for MUSES®
products provide the required muting relay control signal. Due to a very low noise of the VCM the
muting relay does not change its status while MUTE mode is activated.
10.
Capacitors Selection
It is well known in the High End audio enthusiasts circles that the best DC blocking capacitor in the audio
path is "no capacitor". However, as discussed in Section 6 of the Manual, presence of the DC voltage
on the input or output of the MUSES® chip may adversely affect the circuit operation and create extra
noise and distortions. Use direct input connection only when it is assured that no DC voltage will be
applied to the inputs. Use direct output connection only when no DC voltage will be applied to the
inputs AND outputs of the chip. In all other cases high quality DC blocking capacitors shall be used.
High quality polypropylene capacitors present the best choice for the output DC blocking when the
control is feeding high impedance loads. They get pricey at higher than 10uF values.
High quality non-polar electrolytic capacitors of 47uf to 100uF provide good results when bypassed with
10nF to 100nF film or C0G (NP0) ceramic capacitors.
The MUSES®72320 volume control chip datasheet shows polar electrolytic capacitors connected with
positive terminals facing the chip inputs. Outstanding results were achieved with ELNA Silmic II polar
capacitors of 100uF at the inputs and 47uF at the outputs, all caps bypassed with 10nF C0G ceramic
capacitors.
11.
Using Volume Control
Use the VCM Volume Control as a regular dual channel potentiometer based volume control. Use two
boards for balanced operation. Note that Balance control and Mute functions are also available when
used with Academy Audio MCU control boards for MUSES products.
Please refer to the MUSES®72320 volume control chip datasheet for detailed operation description.
12.
Break-in Period
High-End audio enthusiasts are familiar with the "break-in" phenomenon: the sound gets better with
time. In engineering terms that refers to reduced distortions of the audio signal. This distortion
reduction may be attributed to priming of the capacitors and all the contacts in the audio path. A
noticeable sound improvement is expected after about 100 hours of listening.
13.
Technical Support
For any questions regarding operation of the VCM board and for the latest documentation please visit
our forum at www.academyaudio.com.
Happy listening!
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