Nakamichi AV-10 loud thud from subwoofer
I don't know the design of this reciever, and do not have any schematics or engineering information to know the design.
This is a general comment:
In many of these recievers at this level they don't have very good muting designed in to their system. When switching sources, the audio is not being muted.
This is a theory of why the noise is not on the main speakers, but present on the sub woofer. Because the switching noise is of very low frequency, this is why the sub woofer is making noise. The main speakers lack the low frequency sensitivity that the sub woofer has. This is one way of looking at it. It is also possible that there is muting for the main speakers, and none for the sub woofer.
If the reciever does have muting in to its design that is supposed to mute when switching modes, then there is an obvious defect. When a source is switched, or a mode is changed, the output would mute for the duration of the switching interval. This is usually for a period of about 100 ms.
Your best bet is to contact the service rep for nakamichi and ask the question there.
I have serviced many recievers made by other manufactures. The higher end models all had muting in their design. This way, the output was muted when the source was changed, and when the reciever was turned off or on.
Apr 23, 2008 |
Nakamichi AV-10 Receiver