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Speaker resistance?

I have an amp schematics and for the speaker rezistance it says 8 ohms. I have 4 ohm speakers so I am worried that amp circuit will burn.
Will it be ok, or should I put a 4ohm resistor in series with the speaker.
The chip is TDA2615. Power source is 12v lead-acid battery.

NachoMahma6 years ago
. As long as you don't try to run it at max volume all the time, it shouldn't be a problem (although you may may need a heatsink). The chip is rated for a total heat dissipation of 15W. There is a formula for figuring out how large a heatsink would be appropriate in the datasheet.