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Speaker Protection using Lightbulbs??
Recently I was looking at the BOSE 301 speakers (NO BASHING!) and came across a webpage (german though) which showed the inside of the speakers. Every BOSE speaker has this " Automatic Protection Circuitry" which prevents the speakers from being "overdriven".
I didnt know what it was but now looking at the pictures and doing some translating, apparently a lightbulb turns on inside the speakers when the voice coil gets hot? This is very interesting! http://www.avguide.ch/index.cfm/show/page.view/uuid/392EFDF8-8A11-97B0-4619C4153CA42F96 Anyone care to explain more?
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99 C43 98 S420 99 C230K 01 C240 |
#2
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I think what it does is use the temp resistance characteristics of the bulb filament to limit the spikes which will heat the filament.increasing the resistance at that moment and threerfor disipating the spikes.or limit them from the resitance as the filament heats.....I believe I read a description of how that works almost 2 decades ago.....
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#3
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Hi-end manufacturers avoid this and the use of fuses for protection. The audio signal has to pass through a filament in this case... no thanks!
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) |
#4
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Agreed! What's the point of running expensive zero-gauge oxygen-free copper wiring to a set of speakers whose final signal path is a thin piece of tungsten?
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car |
#5
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Quote:
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89 300E 79 240D 72 Westy 63 Bug sunroof 85 Jeep CJ7 86 Chevy 6.2l diesel PU "The object of life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane." Marcus Aurelius |
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Quote:
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) Last edited by cscmc1; 10-19-2005 at 11:15 AM. |
#7
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So when does this lightbulb turn on? When I crank the speakers and leave it cranked?
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99 C43 98 S420 99 C230K 01 C240 |
#8
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Quote:
Edit -- *I* just checked the US site and they're not mentioned. Just that that speaker has "protection circuitry." Presumably the same light bulb.
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) |
#9
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Yeah checked the site and this is known as "Automatic Protection Circuitry" which prevents the speakers from being overdriven at high volumes it says.
All of their speakers have it.
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99 C43 98 S420 99 C230K 01 C240 |
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Quote:
One year at CES, Hartley demo'd the durability of one of their big-a$$ subs by hooking it up to an AC line. McIntosh's biggest solid state amp can supposedly be used to arc-weld in a pinch.
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) |
#11
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BOSE:
Automatic protection circuitry Circuitry protects drivers from being overdriven and provides increased reliability without interfering with the listening experience.
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99 C43 98 S420 99 C230K 01 C240 |
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Quote:
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Never a dull moment at Berry Hill Farm. |
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1992 300D 2.5T 1980 Euro 300D (sadly, sold) 1998 Jetta TDI, 132K "Rudy" 1974 Triumph TR6 1999 Saab 9-5 wagon (wife's) |
#14
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Quote:
Why bother paying all that money for a percieved effect?
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Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952. |
#15
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The same folks that do so buy all sorts of snake-oil gadgets...but they have the means to do so.
I know a guy who mounted large concrete blocks on top of his tract-home priced mono amps to isolate signal path vibrations caused by "capacitor clatter"!
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car |
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