I bought the kit from Sure Electroninc on EBay. I think this kit is the same as the one on sale at Parts-Express. Soldered everthing and the amp worked with no issue. The power supply that I use is an old lab top brick (+-19V). The sound was much better than I expected. Quite enjoyable.
However, as I listened more carefully, I heard some low level hissing noise
. I confirmed that by putting my ears right in front of the speaker drivers (tweeter). It did not sound like some kind of background noise because the noise seemed to be modulated by the signal i.e. when the sound level is higher, the noise got higher. Also, the noise seemed to follow the music's rythym too!! I suspect the noise is associated with the power supply. Those lap-top switching PSU are known to be noisy. Does anyone has similar experience?
Regards,
However, as I listened more carefully, I heard some low level hissing noise
Regards,