UPDATE: RESOLVED. I'm going to leave this up in case it helps someone at some point in human history. It was the Amazon Echo Dot. Right now I am running these speakers with a Fosi DA2120C amplifier. I have them connected by bluetooth to the echo dot in the kitchen. I normally hardwire everything but this system isn't meant to stay here. The echo dot was pushing a nasty bluetooth signal that was somehow clipping my tweeters. The tweeters are fine. The whole speaker is fine. They run fine on all the other amplifiers and even on the Fosi with a bluetooth signal from my phone. Beware of bluetooth signals from Amazon devices.
Some of you may remember me making this simple two way for the family lakehouse. It is designed for good dispersion, which I achieved. Currently, it lives in my kitchen as I have not been up to the lake house in a few months to install it.
I built this with a series crossover. Mostly for fun because it was interesting.
Something is wrong though. This simulation in VituixCad is not showing reality.
Both of the tweeters are blown. I can hear them crackling. Were it one, I would it assume it is defective. It is a Peerless The speakers themselves sound great. The Xo point is a lofty 3800 hz so I'm not thinking that is the issue. I started playing around with test tones and somehow, playing a lowly 40 hz test tone causes the tweeters to crackle. It crackles at all test tones throughout the range. This means that a 40 hz signal is finding its way into the tweeter. Almost as if full range sound is going into the tweeter. Looking at the filter in the sim I should be -90 DB at 40hz with my filter network. This must not be the case.
This is the tweeter:
https://www.parts-express.com/Peerless-DX20BF00-04-3-4-Silk-Dome-Tweeter-4-Ohm-264-1472?quantity=1
Clearly I do not understand series crossovers. I'm thinking neither does this simulation.
Anyone have any solutions to this mystery? I'm also open to theories. I have neither at this moment.
Some of you may remember me making this simple two way for the family lakehouse. It is designed for good dispersion, which I achieved. Currently, it lives in my kitchen as I have not been up to the lake house in a few months to install it.
I built this with a series crossover. Mostly for fun because it was interesting.
Something is wrong though. This simulation in VituixCad is not showing reality.
Both of the tweeters are blown. I can hear them crackling. Were it one, I would it assume it is defective. It is a Peerless The speakers themselves sound great. The Xo point is a lofty 3800 hz so I'm not thinking that is the issue. I started playing around with test tones and somehow, playing a lowly 40 hz test tone causes the tweeters to crackle. It crackles at all test tones throughout the range. This means that a 40 hz signal is finding its way into the tweeter. Almost as if full range sound is going into the tweeter. Looking at the filter in the sim I should be -90 DB at 40hz with my filter network. This must not be the case.
This is the tweeter:
https://www.parts-express.com/Peerless-DX20BF00-04-3-4-Silk-Dome-Tweeter-4-Ohm-264-1472?quantity=1
Clearly I do not understand series crossovers. I'm thinking neither does this simulation.
Anyone have any solutions to this mystery? I'm also open to theories. I have neither at this moment.
Attachments
Last edited by a moderator:
You forgot to post up some shots of your crossovers, the most likely problems are that something in them failed(like a cap) or they don't actually match the design,
I can check them tomorrow and see if they still read out right. I just would be surprised if both caps failed in the XO
No not the design I mean the actual hardware crossovers he built. What do they look like, are they damaged, incorrectly assembled?
The electrical transfer function seems OK to me and protecting the tweeter adequately. But amps clipping sadly produce lots of HF power that wreck even the best crossed tweeters.
Bluetooth is not for "high quality" audio. Even the better codecs are crap. Save BT for your mice and keyboards!
