|19th July 2003, 09:18 AM||#1|
Join Date: Jun 2003
speaker "pop" when x150 power-on
i turn on the system in the following order:
1. mute x2.5 pre-amp (x2.5 is always on)
2. push the "STAND-BY" button on the front panel of x150. x150 goes into operation
however in step 2, my x150 always makes the speakers (b&w m801) a pop, although not very loud.
is this a normal case or my x150 need to be repaired?
thx in advance
|20th July 2003, 11:27 PM||#4|
Join Date: Feb 2002
If itís not too much to ask could you post the stand by circuit Mr. Pass. Some people may want to implement it in some of our diy amps. Iíll even draw it up for you if you send me something ruff.
|21st July 2003, 06:19 PM||#5|
The one and only
If you have an early X150, then the direct coupled inputs will
experience a slight difference in turn-on thump when the
circut is activated because the relay shorted outputs of the
muted X2.5 present a low impedance DC source. If you
capacitor couple the inputs of an X150, which was done on
later models for just this reason, you do not experience the noise.
All this is normal, and the thump itself is minor. You can confirm
this by trying your ordinary turn on procedure but with the
volume control set at "1" instead of "0".
The standby circuit varies by model, according to the needs of
each amp. Publishing any particular one of them is not likely
to be helpful in general.
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