Replacing Genelec 8030 amp

[ferobosi]

I have a pair of Genelec 8030A. The Left speaker had a 6 db lower bass and a bit of distortion than the other one. I changed the boards to find out the problem is from the board or woofer. After the change the healthy one not work at all. So I bring it to an electronic expert and He found the LM4780s not work. He connect the input pin of LM4780 to an active speaker and the sound was clear. We track sound to input pins but there isn't any sound on outputs so there isn't any problem in the boarad before amp. the LM4780 discontinued but I order from a Chinese website but the LM4780s were fake and didn't work at all. The electronic guy suggested to replace LM4780s with two TPA3118 and place them somewhere in the cabinet. The guy had a TPA3118 circuit and run it at 24v to drive the woofer. But the sound was very bad also at full volume was very weak and a lot of distortion. the cabinet don't have a lot of space and I don't wanna change the cabinet or cut it or...
Is there anyone can suggest a solution or had the same problem? What about TPA1316? How can I rescue the old 8030s?

 

[Karlsonate]

This Genelec has active crossover so replacing the amp can be a chore.
You could try searching for other products that also use LM4870 and pull the chip from them, at least it'll be genuine.
Edit: Request for spares on the "Swap Meet" subforum might also work.

 

[Audio>X]

Interesting ...
I didn't know that Genelec's used ChipAmps, but I guess that's nothing surprising these days.
Although that looks a little similar, I'm sure they are vastly superior to 'dreaded' STK's 🙂

 

[Stuey]

The LM4780 IC contains two LM3886 dies, I believe, so it should be pretty good.