amplifier module question

[daniel444]

im looking at buying one of these MA12070 amplifier modules
it has multiple modes of operation
the pictures on the advertisement seem to suggest it needs to connect additional capacitors in series with the speakers on some modes
is this correct ?
any idea on the type of capacitors ?

any suggestions on other high quality amp modules i can purchase instead  ?
thanks

[benj38]

Aluminum electrolytic capacitors. The values you need are shown at the bottom left. I suggest to get capacitors with a voltage rating of double the supply voltage you plan to use.

The more low frequency response you want (i.e., bass), the bigger the capacitor you need. Note, however, that for good bass reproduction you will need a physically big speaker in a good enclosure, etc. (this is a Pandora's box I am not going to open further).

That said, I will only comment that the four big electrolytic capacitors clearly visible on the left side of the board make me think that they have a mistake in the wiring diagram, and that the needed capacitors are already on the board.

[MrAl]

Hello,

The capacitors already on the board could be for the power supply filtering, but it's not possible to say for sure without seeing the schematic of the power amplifier itself.

Regardless, to get good bass response the power supply also has to be well filtered or else the power supply voltage could dip during low frequency peaks.

[dietert1]

Other application circuits suggested for this amplifier module show that a capacitor is needed whenever one of the four channels is used separate from the others. There is DC on each amplifier output. The combination of two channels as one full bridge output can work without the capacitor, as the DC will be similar on the two channels.

Regards, Dieter