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Old 20th January 2012, 08:57 AM   #91
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Protect with halogen lamp
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File Type: jpg APEX HF X-OVER+LIMITER.jpg (99.5 KB, 337 views)
File Type: jpg HF X-over with bulb protect.jpg (45.4 KB, 324 views)
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Old 20th January 2012, 09:05 AM   #92
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This is very good protection with 2N3055, activ at 12V RMS or 34V at peaks on driver.
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File Type: jpg APEX HF X-OVER + BJT PROTECT not compress peaks.jpg (139.5 KB, 408 views)
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Old 20th January 2012, 09:12 AM   #93
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Quote:
Originally Posted by apexaudio View Post
Protect with halogen lamp
For 10W nominal power drivers use 2 X 12V 10W bulbs or 24V 20W single bulb,
2 X 12V 20W bulbs is for protect 20W drivers and
2 X 12V 35W bulbs is for 50W drivers.

Last edited by apexaudio; 20th January 2012 at 09:14 AM.
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Old 20th January 2012, 09:25 AM   #94
AndrewT is offline AndrewT  Scotland
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What are the cold resistances of those bulb filaments?

"What if", the bulb filament resistance is higher than the crossover resistor presently in place in the unprotected crossover?

How do we adjust the crossover resistor value/s to account for the bulb filament resistance?
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Old 20th February 2012, 12:24 AM   #95
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Explain in as much detail why a parallel fuse is necessary?

The bulb filament resistance is explained over and over in the thread. (I fully follow and understand).

I'm asking myself why bother with the parallel fast blow fuse. During high current (mic squeal or large crescendo), the bulb goes high resistance and the parallel fuse will pass much of the current to the driver. No protection here. Once the fuse blow, the bulb provides protection.
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Old 20th February 2012, 09:03 AM   #96
djk is offline djk
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It's not.

Some would argue that the bulb needs to be bypassed during normal use, and a fuse/polyswitch/relay serves that function.
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Old 30th July 2012, 11:47 PM   #97
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Any knowledge on ferrofluid? I've read it helps keep the voice coil cool and typically used on high frequency drivers and tweeters. It's available online as a replacement for drivers with worn fluid. I've read that it should NOT be used on existing non-fluid drivers.

If it increases power handling, what's the typical degradation in response look like? It appears your adding mass to the voice coil thus reducing the highest sparkle of the tweeter sound.
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