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Got the 801 Travel Adaptor

post #1 of 4
12/23/10 at 6:45pm
Thread Starter 

It's smaller and a lot lighter than the one that come with the unit.  It also supports 110v and 220v.  Why don't they ship with this rather than the brick of an adaptor that currently ships with the 801?

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post #2 of 4
12/24/10 at 9:08am

Because the stock AC Adapter is a high quality transformer power supply that will ensure high quality audio playback while plugged into the AC Mains.  The travel charger is a cheaper switching power supply that can add a good amount of noise depending on the quality of your AC Mains.  Although the fact that the HM-801 always runs on battery power (battery is being charged while plugged in, but the HM-801 itself is being powered by the battery, the HM-801 will not work without a battery if plugged into an AC Adapter).  -Ed

 

 

 

 

 

 

 

 

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post #3 of 4
1/1/11 at 6:50am


 

Quote:
Originally Posted by Edwood View Post

Because the stock AC Adapter is a high quality transformer power supply that will ensure high quality audio playback while plugged into the AC Mains.  The travel charger is a cheaper switching power supply that can add a good amount of noise depending on the quality of your AC Mains.  Although the fact that the HM-801 always runs on battery power (battery is being charged while plugged in, but the HM-801 itself is being powered by the battery, the HM-801 will not work without a battery if plugged into an AC Adapter).  -Ed

 

 

 

 

 

 

 

 


Ed, that is incorrect.  I use the 801 with no battery plugged into the AC adapter with zero issues.

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post #4 of 4
1/1/11 at 7:08am

Linear power supply (the original brick size PSU)  is always considered to be better than switching type (the later version) in audio application because it has very low noise and response to heavy load faster, though they are large, heavy, much less efficient and gives off a lot of heat. An improperly designed switching adapter can actually add humming into audible range. A good switching adapter usually switches at a much higher frequency (in MHz instead of kHz) to bring the noise out of hearing frequency range and smooth out the rest with a good filter design, however it is still noisier than a linear power supply. This is why linear power supply is still preferred in high end application where minimum noise is required.

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