On Sunday, October 25, 2015 at 7:12:18 PM UTC-4, Trevor Wilson wrote:
> On 26/10/2015 6:32 AM, Gareth Magennis wrote:
> >
> >
> > "Trevor Wilson" wrote in message news:d930b6...@mid.individual.net...
> >
> > On 25/10/2015 11:54 AM, Gareth Magennis wrote:
> >>
> >>
> >> "Trevor Wilson" wrote in message
> >> news:d92kb7...@mid.individual.net...
> >>
> >> On 25/10/2015 8:49 AM, Gareth Magennis wrote:
> >>>
> >>>
> >>> "Trevor Wilson" wrote in message
> >>> news:d92c5n...@mid.individual.net...
> >>>
> >>> On 24/10/2015 3:07 PM,
jurb...@gmail.com wrote:
> >>>> Cylindrical. Axial leads.
> >>>>
> >>>> Ordered caps for a speaker crossover because the leads had literally
> >>>> been shaken out of the originals. But I had no luck finding those
> >>>> bulbs. I would rather not jump it out. I guess I could and just put a
> >>>> beefier horn in it.
> >>>>
> >>>
> >>> **Select an appropriate sized Polyswitch(tm). Cheap, reliable and
> >>> effective.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> Polyswitches are not compressors.
> >>>
> >>
> >> **Correct. They're much better. They protect drivers, without
> >> significant audible problems (like compression).
> >>
> >>
> >>
> >>
> >>
> >>
> >> Do you think you would be able to hear such a compression problem?
> >
> > **Absolutely. I've proven it, under blind test conditions, to clients
> > who own speakers that are equipped with such things.
> >
> >
> >
> >
> > OK, but the point I didn't quite make yesterday was that you would only
> > hear such a compression "problem" if the system was being abused, i.e.
> > overdriven.
> > This is when the compression kicks in, to protect the tweeter.
>
> **Well, yes it does. However, it depends on the system. For sound
> reinforcement, the compression effects are not likely to be a problem,
> though most professional systems use far more sophisticated electronic
> compression systems.
>
> >
> > To single out the compression as a problem is to completely ignore the
> > simple fact that this is happening because of a far bigger problem
> > elsewhere, and the volume needs to be reduced before something blows up.
>
> **In domestic systems a Polyswitch(tm) is, IMO, a better choice.
>
> I located and measured a long, thin filament lamp (which looks like a
> baretter). Part # GE1936. Nominally, I would guess it is a 12 Volt lamp.
> At 12 Volts, current consumption is 0.75 Amps. Here is the resistance
> plot, vs. current:
>
> 0.1 A - 1.7 Ohms
> 0.2 A - 2.15 Ohms
> 0.3 A - 3.4 Ohms
> 0.4 A - 6.3 Ohms
> 0.5 A - 9.68 Ohms
> 0.6 A - 12.53 Ohms
> 0.7 A - 15.13 Ohms
> 0.75 A - 16 Ohms
>
> A Polyswitch(tm) typically exhibits insignificant resistance changes, until
> the switching point is reached. They're self-resetting and, provided
> Voltage ratings are not exceeded, quite reliable.
>
> --
> Trevor Wilson
>
www.rageaudio.com.au
>
> ---
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Hi Trevor, I'm not an audio guy. But one thing about polyswitches is that
they do age.. the more times they trip the lower the trip point.
I don't know if that would be an issue where you use them.
George H.