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What an odd circuit?
There should be no positive and negative because audio is AC, not DC.
R1 is permanently in series with the speaker which will reduce the power by 1/4 and can't be good for the damping factor.
When the breakdown voltage of D1 to D4 is exceeded, the TRIAC is triggered which connects R3 across the speaker, reducing the power by half.
This seems like a bad idea, a DIAC and potential divider should be used instead of D1 to D4, the TRIAC should short the speaker directly and R1 should be a PTC resistor to limit the current.
Yes, I suppose it makes sense to use the same notation., not that it matters: the circuit can be connected either way.It's common to mark speaker terminals as such, in order to maintain correct polarity, just as speakers are marked as well.
Why is that?Not a problem on a high frequency unit like this, only on bass units.
I would suggest the ciruit is drawn wrongly, the TRIAC appears to be connected wrong, and the diodes can't be just diodes, but probably zeners in series with diodes.
Yes, I suppose it makes sense to use the same notation., not that it matters: the circuit can be connected either way.
Why is that?
Surely it has resonance to?
Fair enough it might not be noticeable but wasting half the power isn't a good thing, the listener will just turn the treble up a bit causing the amplifier to work harder.
That makes sense but I would've put the zeners back-to back.
They are back to back.
It's common to mark speaker terminals as such, in order to maintain correct polarity, just as speakers are marked as well.
Not a problem on a high frequency unit like this, only on bass units.
I would suggest the ciruit is drawn wrongly, the TRIAC appears to be connected wrong, and the diodes can't be just diodes, but probably zeners in series with diodes.
Then why are there two pairs of diodes?
Only one pair of zeners connected back to back is required.
It is normal for a tweeter, especially a very sensitive compression driver that feeds a sensitive horn, to be fed from an attenuator. Then its output level will match the output of a woofer that needs to move a lot of air so it is not sensitive.