speaker "pop" when x150 power-on - diyAudio
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Old 19th July 2003, 10:18 AM   #1
dream is offline dream  Tibet
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Location: taiwan
Default 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
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Old 20th July 2003, 12:18 AM   #2
The one and only
 
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I'll check on it next week at work.
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Old 20th July 2003, 05:29 PM   #3
dream is offline dream  Tibet
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thx you nelson
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Old 21st July 2003, 12:27 AM   #4
LBHajdu is offline LBHajdu  United States
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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.


Levente Hajdu
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Old 21st July 2003, 07:19 PM   #5
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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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Old 21st July 2003, 07:29 PM   #6
tiroth is offline tiroth  United States
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Location: Pittsburgh, PA, USA
Talk about customer service.
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Old 22nd July 2003, 08:26 AM   #7
dream is offline dream  Tibet
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thx nelson

do you think this DC singal will harm the tweeter?
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Old 22nd July 2003, 11:21 PM   #8
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No. Something like this is usually a large fraction of a volt
in the 1 Hz range.
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Old 22nd July 2003, 11:27 PM   #9
jleaman is offline jleaman  Belgium
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could you post the stand by circuit for a aleph 2 ?
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Old 22nd July 2003, 11:38 PM   #10
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There has never been a standby circuit for the Alephs. I would
have to create one...
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