Solved! Need some Help

[emmanuelmwema22]

Hello guys...am using An Ampex subhoofer which blew due to electricity falts...on opening it TDA 2030 was damaged and whwn i replaced the three of them, only the external speakers has normal sound but the bass is silent...What could really be the problem?

 

[americanaudiophile]

Did you check that the woofer itself wasn't blown?
Measure the impedance across the speakers terminals. Anything from 1 ohm up is OK. Less and the voice coil is blown.