Help Identify components

The attached photos are of a pcb board from a Blackweb Tsunami Bluetooth Speaker model BWA15AV112. The speakers distort when volume is increased greater than 40%. Need help identifying the four components with 150 stamped on top. The are located on the right next to the 470uF capacitors. Also is the cream colored a sign of leakage or just mounting putty? Tr.ying to determine if there is a problem with the stereo amp

On the bottom picture of the pcb board the four 150 components are diagramed with a coiled line between the connectors.

Thanks,
Anzio

Those are inductors, part of the lo-pass filtering to the speakers (to remove the class-D switching signals) - they 100% WON'T be faulty.

The white stuff is glue, to hold the components in place.

You need to put a scope on the outputs, see if it's distorted coming out, or if your speakers are duff.

Thanks, don't have a scope but will try a different set of speakers.

Update:
I checked the speakers on a different amp and they are fine.
I don't have the schematics for this board, so any suggestions on what to check next?

Anzio

It's very unlikely you'll find a schematic for this product making fault finding very difficult. Best advice I can give is just replace it?

Anzio said:

The speakers distort when volume is increased greater than 40%.

Click to expand...

This is typical of all amplifiers. Don't turn up the volume.

Nigel Goodwin said:

or if your speakers are duff.

Click to expand...

Why do you think there is a problem? Do you have another amp that is louder? It is only 20 watts. There is a chance that there are two 10 watt amps working together. (bridge) If one was not working then it would not get real loud.

At first I thought it was just bad reception over the bluetooth connection but it happens also with a line in signal. You are probably right that it is just a limitation of the low powered amp. I may spend a little more time on it just to be sure.

Thanks