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Professional Audio

amplified speaker does not sound

Orlan River
hace 5 años
hace 5 años
I had the output transistors damaged, I changed them and the drive sounded, but not the big speaker, then I wanted to change a capacitor to make the big speaker sound, now none is heard and there the problem of my query. the transistors are sc5200 and the sc1945 on base there is 0.5v collector 50v emitter 0v at the output where the speaker is connected I test it to see if there is audio and if audio comes out I thank you for helping me thanks Oh I forgot the capacitor that changes is from 2.2uf to 250v and then I put the previous one and nothing.
Alexis Navarro
hace 5 años
hace 5 años
Cordial greeting, friend I do not understand very well as you explain, that when changing the power transistors, the dreive and the wofer began to sound, but then I try on the transistor emitters there is audio, which means that if there is Audio? If you mean that there is sound amplification but in a signal, it is certain that what happened was an overload on the output more exactly in the crossover, so you must verify its components, coils for the different frequency cuts are not In short, filters and condenses in short and open resistors, since it first sounded in the driver and the bass speaker not, so I would also suggest checking this speaker not affected, discard it verifying its impedance is correct. Regards
Jose Guillermo Valderrama
hace 5 años
hace 5 años
good day In one part of his query he says the following; at the exit where the speaker is connected, I tested it to see if there is audio and if audio comes out I thank you for helping me thanks. .This makes me understand that the audio output card is fine, I imagine that the treble was heard first because the horn is burned or the train is loose. and after being tested the sharp one was damaged (drive). He already checked the treble and the horn (speaker) with another amp. or with a battery or with the ohmmeter ¨?
Orlan River
hace 5 años

I explain, the amplified speaker did not light at all because the fuse was damaged and the two output transistors replaced them and the speaker turned on but only the horn was heard and the driver did not, then I soldered the positive horn cable and put it on the driver's output track and there was no sound from there I changed a capacitor from the driver's output and now neither of them is heard and I don't know what happened and I told myself I will change the capacitor that I had before and still don't hear anything and I I followed the audio signal with a small amplifier heard from the input to the
s

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EVELIO RIOS H
hace 5 años
hace 5 años
Friend would be nice to comment on the brand and model, do not you think?
Orlan River
hace 5 años

the brand is american extrem

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Orlan River
hace 5 años

I found the fault was that a dirt track that led to the speaker's negative was broken and could be seen because it was covered by a large capacitor.
Well I managed to sound the horn now I measured the base of the output and one has -0,557 to 0,562 and the other 0,555 to 0,561 asked
Is it correct with that variation?

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EVELIO RIOS H
hace 5 años

Those voltages are acceptable.

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Orlan River
hace 5 años

because it warms the trasistores too much when it sounds like I should do to lower the temperature
The American xtreme brand speaker

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EVELIO RIOS H
hace 5 años

Orlan what voltage is between base and base of the transistors (place red tip on one base and black tip on the other base), there should be between 1.3v 1.5v or so.

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Orlan River
hace 5 años

between base and base is 1.15 but let's put it to 1.2, I think it's correct
But I realized that the horn has 1 ohm and I think that is why it is heated now the speaker does not say how many ohms it is but these speakers I think are 4 or 8 ohms.

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Orlan River
hace 5 años

How can I know how many watts of output this amplifier has and how many ohms it is.

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EVELIO RIOS H
hace 5 años

Strain an 8 ohm speaker at 500w. The heating is by the short coil of the speaker. Another way of knowing is if the speaker has output for another speaker; if so, then the speaker is 8 ohms if not 4 ohms.

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Orlan River
hace 5 años

I have an 8 ohm at 400w ppmo that would be fine

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Orlan River
hace 5 años

but inch is smaller than he has

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EVELIO RIOS H
hace 5 años

Friend rehearse with that no problem.

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