50W+50W Wireless Bluetooth 4.0 amp power supply

[CM7]

I ordered this amp for my speakers. I was wondering it says it will take 2.1 Interface 8 ~ 25V DC power supply. So does that mean any DC power supply within that range will work? I have one that outputs 13.8V DC 1A will that be enough? I am really new to reading power supplys. 

[mariushm]

The 50w + 50w is absolute maximums, with lots of distortion .. here's the specs for genuine chips (can't be sure those boards have genuine chips) :

 

From datasheet:  http://www.st.com/content/ccc/resource/technical/document/datasheet/f4/3e/da/a3/97/e7/4f/8d/CD00205863.pdf/files/CD00205863.pdf/jcr:content/translations/en.CD00205863.pdf

 

* 50 W + 50 W continuous output power at THD = 10% with RL = 6  and VCC = 25 V
* 40 W + 40 W continuous output power at THD = 10% with RL = 8  and VCC = 25 V

 

At 1% THD, the maximum power is around 32W per channel with 8 ohm speakers at 25v DC input.

In the datasheet, see Figure 4.1 .. the maximum power varies with the input voltage, and the graph only shows output from 15v input, but you can see from the graph that at 15v if you want distortions to the 1% or less, the maximum power will be around 15 watts.

 

In the same datasheet at 3.3 electrical specifications, you can see the minimum voltage listed as 8v DC, so the amplifier can probably work with 13.8v DC. With just 1A of current, it means the amplifier will receive about 14w  (13.8v x 1A = 13.8w) and the amplifier is about 90% efficient, which means about 11-12 watts will be available for actual sound.  This means at most you'd get about 5-6w per speaker with that amplifier, so it will work as long as you don't raise the volume much.