Can I used dc 12V 2A to 11.5V 1.6A ac input in my speaker

"Hi @natzirt ,

It should work OK.

According to the user manual the speakers use either a 11.5VAC 1.6A adapter or a 12VDC 1.5A adapter depending on which country it is sold in."

"If it would be DC on your speaker then probably it will work.

Since it is AC on your speaker it should just rectify your 12V AC to DC. Probably it will not work, but you can try ;)

I find it kinda funny because replacement parts for your loss also are rated for 12V DC"