T2900/T3000 2.1 speakers died

About six months ago I bought a set of Inspire T2900 2.1 speakers. They quit working recently, and I assumed it was the power supply. No power light on the controller
Today I bought a set of T3000 speakers to replace them. They worked fine when I broght them home. I then tried the power supply from the old speakers (also 2.9 amps) with the new speakers. They worked fine.
Then I tried the old controller with the new speakers. Didn't work.
Now the NEW controller with the NEW speakers doesn't work.
Does anyone have any experience with controllers frying internal parts? Are there burned-out resisters or something that could be replaced?

I'll respond to my own message with an update.
I opened the subs, and found that the fuses in both units were blown.
I replaced the T3000 fuse, and it works fine with it's own parts now. I then replaced the fuse in the T2900, and using it's own parts the fuse blew again. Next I replaced the fuse again in the T2900 and used the volume control from the T3000. That works well.
So, it's the volume control from the T2900 blowing the fuses. I'l try to get another.

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