Ta, TLS Guy
Yes, I agree piezo tweeters are low end. It's a small independent church, not a lot of funds and much of the system was originally home built. Been replacing, upgrading things as opportunity arises. From what I have read, there are only a handful of piezos considered suitable for PA, original production Motorola KSN 1142 being one of them. I have some data sheets on what model number parts that should be in the enclosures but I'm not sure it's totally correct.
The stated FOH crossover is Jaycar CX-2612 Crossover frequency 3.5 kHz roll off 12dB / Octave, so 2nd order. FOH drivers were replaced with Selenium 12PW3 12 inch
https://www.lautsprechershop.de/pdf/selenium/selenium_12pw3.pdf some years ago as the originals coils got cooked. It does seem to me quite an ask for them to perform up to 3.5k as well but 2 way seems pretty normal for this size of PA system.
They certainly aren’t HiFi speakers but the space gets used for every activity including youth drop in centre so speakers have to be robust. I can’t imagine running ribbon tweeters in that environment. I guess a lot needs replacing but the speakers are not as dire as some other things. It’s all pretty old and I go around, testing, cleaning conditioning connections, faders pots, minor repairs etc. All in all, it’s not too bad, an audiophile friends tells me it’s the best church sound he has heard. My opinion is that the next biggest sound quality issue is the room acoustics. Not that the sound is terribly bad but it gets in the way of efficiently resetting EQ after maintenance or deploying effective foldback.
It’s just that I have been reading about crossovers with a view to doing my Polk 10Bs at home but then got to wondered whether it was worth considering the church speakers particularly as we do have difficulty getting useful foldback sound (without crossovers)
Maybe it’s better to just get new speakers but they cost so very much I doubt anyone will support that.
Ken