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Multi-Way Conventional loudspeakers with crossovers

simple super-tweeter protection circuit
simple super-tweeter protection circuit
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Old 22nd December 2004, 05:59 AM   #1
Macdude443 is offline Macdude443  United States
diyAudio Member
Join Date: Dec 2004
Location: PA
Default simple super-tweeter protection circuit

I have a pair of Realistic (ahh) Super Tweeters that I need to protect from the 150w (per channel) power amplifier I am using (Onkyo M-501). The ratings for the tweeters are 50w Maximum Music Program (so, 25 REAL max watts I believe), and 8 ohms. I basically need a circuit made with cheap parts I can find at a local Radio Shack to protect the tweeters from blowing out when high vocal/instrumental passages are hit. I don't listen to this system at a loud level. I have heard of fuses being too slow, and would like to try the light bulb path if possible, but am not sure of the power ratings of the bulb or what config. to use in setting the circuit up. Any help is appreciated! Oh, the tweeters do have built-in crossovers.
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Old 22nd December 2004, 06:06 AM   #2
bigmike216 is offline bigmike216  Canada
diyAudio Member
Join Date: Jul 2004
Location: BC, Canada
after acrossover, the tweeter isnt going to see that whole 150 watts.. usually about 10-20% depending on crossover point is the rule of thumb.
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Old 22nd December 2004, 06:42 AM   #3
Tim Moorman is offline Tim Moorman  United States
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Join Date: Nov 2002
Location: Indiana
Agree with bigmike. If it is a true supertweeter, it is probably crossed over very high where there is little power demanded. They will never see 50 watts. A crossover serves as voltage divider, also. Check to see if there is a resistor in series with the tweeter. This along with the other crossover components should provide the protection you need. Just don't drive your amp into clipping.

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Old 22nd December 2004, 05:16 PM   #4
Macdude443 is offline Macdude443  United States
diyAudio Member
Join Date: Dec 2004
Location: PA
That sounds abut right, I do recall hearing that the clipping of an amp can push some pretty bad freqs to the tweeters, possibly harming them, thanks. I'll check on that resistor.
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