Help with Sonus Faber Extrema issue
I agree with the crossover problem. There is a power resistor in series with the tweeter. If it is failing, the resistance rises with temperature and the signal voltage is converted to heat instead of music. Explains why it's only one speaker, happens after it running and returning to normal when cool. |
I agree with the crossover problem. There is a power resistor in series with the tweeter. If it is failing, the resistance rises with temperature and the signal voltage is converted to heat instead of music.It wouldn’t cause this explanation, just muted high frequencies, he would still have all the bass and midrange. " will exhibit significantly lower volume (down to almost no volume)" Try another amp first, as these Extremas are put together like a Swiss watch, it would be a shame to break/damage all the seals to find out they’re fine. Cheers George |
I hear you, George, but it happens with two amps. I guess the way to be certain is to repeat the failure mode, turn off both amps and immediately measure the resistance across both speaker's terminals and compare. If one is way higher than the other then it's the resistor. If both are the same it's something else. (The only other thing to check is to swap cables at the speaker terminals instead of the amps to rule out a flaky cable connection). |
Yes you got two sets, one for the bass and one for the tweeter. The tweeter pair should measure open circuit because of the cap in series . The bass will measure what ever the resistor is in series, (does anyone know what that is?) . https://ibb.co/BNtQdtJ One of the speakers periodically will exhibit significantly lower volume (down to almost no volume) in the middle of a listening session.BTW: you haven’t said what’s actually happening, is there nothing from the tweeter or nothing from the mid-bass or very little from the tweeter or very little from the mid-bass Cheers George |
