I am interested in what the OP is thinking in trying to "fix it". Its it broke? Does he think replacing caps is what fixes old electronics? Does he know how its wired?
It is common knowledge that electrolytic capacitors dry out over time. They simply do. And as they age, they are the one thing in any audio device that will degrade the sound as they age. And when they begin to actually fail, they begin to stress other components that can lead to more drastic and expensive repairs. But once they begin to dry out, the loss of quality sound from the device is the first thing to go whether in an amp or in speakers.
These speakers are about 30 years old or so, and since I'm putting new surrounds on the woofers and passive radiators, I thought it would be a good idea to change out to new audio grade capacitors just because I had to take the apart anyway.
I've refurbished several vintage amps by re-capping them, and putting new caps on them totally transforms them into very impressive amps, and the same goes for speakers as well.
What stumps me about the A-16 2105 is that I have run those numbers all over the place and can't come up with any kind of reference to it.
I understand the guesses as to it being a diode or a transister, but those are components that are just not found in any of the speaker crossovers I've looked at.
As far as the red component, while I've seen resistors in that form factor, this one isn't marked as to it's resistance (unless it's underneath), so I am very agreeable to the idea that it might be an inductor.
But whether it's an inductor OR a resistor, that kind of wirewound component is not prone to fail (even with age) so I don't plan on changing it out for anything else.
I "might" change out the sandcast resistor because the "pros" often recommend replacing a sandcast with a wirewound in this application, but I'm not totally sold on that idea so I think I'll leave it alone as well.
Whatever the A-16 2105 is, and as curious as I am about it, I've decided to leave it alone and only replace the two capacitors with audio grade caps.