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Audio Equipment: Is the loud popping sound when you plug/unplug your speakers bad for them? Most speaker cones are driven from a power amplifier.. The pop - like you said - is a transient spike. But the important thing here is that it gets amplified up through the pre-amp and into the power amp.. Speakers usually move in the ol' in-out fashion with respect the the voltage at the input.. and a big spike could loosen the cone from its suspension mechanism.. The higher the power and the more delicate the cone - the more the danger to the speakers ( what is normal for a woofer cone, could end blowing up a tweeter cone) . For e.g. In live events, where high output PA speakers are used, this is a very serious issue - because such a spike could throw the speaker cone out of its place, and it wouldn't work from that point on. For this reason, some high end audio equipment have a limiter at the output, that prevents signal from exceeding a certain predefined limit. So any occuring transients would never hit the cone at a level that is unhealthy to them.
Most home audio equipment tends to operate at lower levels. That being said, there is still some damage inflicted on the speakers - just maybe not of the same magnitude.. especially the smaller ones.
If your system has a remote control, it might be wise to hit a mute button just before you change to another input... or maybe find a way to turn off just the speakers (if separately powered) before you interchange the connection
Plug in one a at time using the same input. Take the left speaker and the left input wire. Plug the wire from the mixer into the one speaker if it sounds ok then unplug the speaker and replace it with the right speaker. If it sounds ok replace the wire with the right wire. This will tell you that each speaker is working and each cable is working. If you switch speakers and they sound different then the possibility of a blown high end driver in one. If they sound ok each by it self but the high end suffers when they are both hooked up then the possibility of the speakers might be. Not sure what the sub has to do with the whold setup. Any further questions call me at the store.
i) Disconnect one lead of loudspeaker & insert an open-ended guitar cable into headphone socket.
ii) Put a dc voltmeter across open end jack then turn Frontman ON for a few seconds.
iii) The reading should be about 0volts - if the voltage is high (27v), then it is likely that the PA chip TDA1514A has blown.
iv) If,however, the voltage is correct in iii) , then reconnect speaker & put guitar cable into the POWER AMP IN socket & connect other end to guitar...Turn on briefly, if there is still hum then fault is in the output stages & will require chassis removal to solve.
Proper level setting of the mixer is important. HOWEVER if the clipping is occuring at the speakers the only possible problem MIGHT be that you have a supersonic feedback that is saturating the speakers above your hearing range, Be sure you don't boost the highs too much with the EQ as this can cause the feedback that you can't hear. Also make sure that you power the speakers from the SAME receptacle as the mixer, even if it means running an extension cord to bring power to the mixer. This is to avoid a low frequency hum and common mode distortion/damage. A low frequency hum could cause the clipping.
It would be a good idea to get a sound meter to check the sound level. You should be able to reach 85 Db from this system without clipping. If you need more than that, you MAY need more speakers if the band instruments are too loud. Also if the band has amps that get into the vocal microphones that adds to the clipping level... make sure the mics don't "hear" the band instruments. Make sure your speakers are toward the audience from the mics to avoid the supersonic feedback problem. If the vocalists can't hear themselves with that configuration you need to set up seperate stage monitors.
There are some pretty good videos on YouTube about proper mixer level setup.
The best way is to use a two-way crossover between the mixer and the amplifiers. In your case, the low output from teh crossover would go to the powered subs, the highs to the QSC. Use the crossover adjustment to set the frequency crossover point to get the sound quality you require.
Sorry, but this unit does NOT support "bridged" mode. You will have to drive seperate speakers from the two seperate outputs. You would NOT get any more power if you could do bridged mode than you could with 4 ohm speakers on each of the two output channels.
Check loudspeaker is not seized, by gently moving cone to and fro. If it is very stiff, chances are that it has been overloaded and seized. Test this by substituting it with a known good speaker.
The output stage has a problem. From your description, I'd guess that the high voltage supply has failed. The low volume and distortion suggests that you are trying to power the speakers from the driver section rather than the outputs. There is a resistor that fails in some of this series. If I remember correctly it is either a 2K or 3K resistor 10 watts in size. If you have no experience with repairs, I'd seek a service shop that is familiar with these units. The part runs between $5-$10.
1. The master volume control on the SR16 is at least half way up. Turn down the amp as needed. Running very low output of the SR16 and high amp gain is sure to get distortion.
2. Check power adapter is the original and is producing correct voltage.
3. Check that audio cable is high quality instrument cable and not consumer or speaker cable.
This could be caused by a faulty cable or a fault on one of the ends of the cable. Open each side of the cable, the jack should screw off. Once it is open check to make sure that both of the wires are connected firmly. If they're not, you will need to solder them on properly and if they are, then this is not the problem.
This could be a due to the settings on your speaker or the mixer you are using. On the speaker, check that the low's mid's and high's are set correctly and then check the mixer to see if the line in from the guitar is set correctly and check that the line out is set correctly. If all of this is fine then it could be due to your guitar DI.
Check that your DI is set correctly,e.g. Make sure that the DI is not set to run a link between both lines, it should be set as single.
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