Driver protection idea

[Immacomputer 10+ year member]

I just think it would be easier to monitor the driver's impedance...

That wouldn't work. Impedance rise comes from more than just heat. In some sealed systems, the sub's impedance may rise up to 40ohms or more. This does not mean that the driver is overheating at all, it's just how the circuit works.

A better method (other than a temperature probe and circuit) would be to fuse the speaker leads but even that isn't going to work all the time.

 

[djman37 5,000+ posts]

would it work the same way if you had drivers in parallel?

 

[reneeb7363 10+ year member]

that would make a good return business... make it a single function device (where all it does is monitor impedence and restricts output) that you would have access through a laptop to change the parameters. Train a few people how to do it... voila-- return customers

 

[spoonraker 10+ year member]

Obviously if you used the impedance to regulate the speaker, it would have to be calibrated on each individual speaker. I'm not sure how you would know what impedance is dangerous without just getting it to dangerous levels and measuring it.

Measuring the temperature of the voice coil would be a much more straightforward approach in theory, you just cut the power or reduce it when the temperature reaches whatever you set, but it would be harder to implement in real life.

 

[reneeb7363 10+ year member]

with that being said... there must be an estimmated "range" for eachdriver or configuration based on its at rest state... it could be fine tuned from there for each individual application

 

[thylantyr 10+ year member]

Drivers have mechanical and thermal power handling. The logical conclusion

is you need to monitor temperature and excursion if you want excellent

protection. Servo subs exist for the mechanical issue, adding a temperature

sensor is probably much easier than people think. The sensor could be

a simple cutout switch that connects to the amplifier turn on wire.

Or just buy a better woofer that works outside your operating range ........... lol

 

[reneeb7363 10+ year member]

lawl.... thread killer

 

[tommyk90 5,000+ posts]

That wouldn't work. Impedance rise comes from more than just heat. In some sealed systems, the sub's impedance may rise up to 40ohms or more. This does not mean that the driver is overheating at all, it's just how the circuit works.
A better method (other than a temperature probe and circuit) would be to fuse the speaker leads but even that isn't going to work all the time.

x2 with everything. But then you run into the issue of having a fuse that takes much more current than it is rated for, which I know a lot about being a MECA competitor. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Impedence fluctuates greatly just playing music, even at low levels. Impedence can also vary on the enclosure being used, and the car it is in. You can cook a subwoofer while having nearly no impedence rise and you can also cook a subwoofer having an astronomical rise.

A temperature probe in one of the basket vents or the pole vent would be a better solution or, like posted above, you can have a subwoofer thats designed to handle the power your amp puts out. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[joetama 5,000+ posts]

I know a tried and true way....

DON'T BE AN IDIOT AND PLAY YOUR SHIT TOO LOUD!!!!!

But, a lot of companies used to put light bulbs in line for protection. From EV & JBL all the way to BagEnd....