Kako odpraviti pokanje nizkotonskega zvočnika
Ali imate težave z nizkotoncem, ki oddaja glasne, pokajoče in pokajoče zvoke? Pogosta težava je, da podmornica oddaja naključne in občasne pokajoče zvoke, ki so lahko zelo nadležni.
Po naših izkušnjah ugotavljamo, da gre včasih za res hiter dvojni pok, drugič pa za en sam pok in se lahko pojavi ne glede na to, ali uporabljate sistem ali je v stanju pripravljenosti.
Obstaja veliko razlogov, zakaj nizkotonec povzroča pokanje ali pokanje. Lahko je posledica umazanega signala iz ojačevalnika ali sprejemnika, prenizkega sprejemnika, funkcije samodejnega vklopa, motenj, pregrevanja, težav z glasovno tuljavo ali izrezov. V vsakem primeru je glavni vzrok za pokanje in prasketanje zvočnikov neka oblika prekinitve toka ali zvočnega signala.
V tem članku vam bomo pokazali, kako odpravite težave in popravite hrup nizkotonskega zvočnika. Upoštevajte, da imamo ločen članek o tem, kako odpraviti prasketanje zvočnika ob spremembi glasnosti.
Hitri koraki za odpravljanje težav
Preden se lotimo podrobnih pregledov, je tukaj hitra metoda za odpravljanje težav, ki vam bo morda pomagala rešiti težavo v nekaj minutah. To običajno odpravi težavo, še posebej, če nizkotonski zvočnik začne takoj po vklopu:
- Izklopite sub in sprejemnik ali ojačevalnik.
- Preverite, ali nizkotonec diši po zažganem. Če se, si oglejte ta vodnik o tem, kako popraviti zgorel nizkotonec. Če ne, nadaljujte.
- Prepričajte se, da je globokotonec pravilno priključen na sprejemnik ali ojačevalnik
- Izklopite vse bližnje elektronske naprave, ki bi lahko motile podvodnico
- Premaknite žice globokotonca stran od električnih kablov.
- Če težava še vedno ni odpravljena in na sprejemniku nimate posebnih nastavitev, ponastavite sprejemnik na privzete tovarniške nastavitve. Za navodila za ponastavitev si oglejte priročnik z navodili za stereo sprejemnik.
- Poskusite z drugim sub. Če je težava odpravljena, ko je priključen drug sub, je težava v izvirnem sub. Če težave ne odpravite, je težava v sprejemniku.
Če to ne deluje, nadaljujte s podrobnimi koraki spodaj.
1. Onemogočite nastavitev samodejnega vklopa
Ali imate pod nastavljeno na "vedno vklopljeno" ali samodejno? Mnogi ljudje so odpravili težavo s pokanjem nizkotonskega zvočnika tako, da so preprosto preklopili »način napajanja« iz »samodejnega vklopa« v »vedno vklopljen« ali preprosto »vklopljen«.
To je hiter in enostaven način, da preprečite, da bi globokotonec počil, če deluje.
Zakaj to deluje?
No, funkcija samodejnega vklopa se uporablja za samodejni vklop suwbooferja, ko zazna vhodni signal. To zmanjša porabo energije in tako zmanjša notranje ogrevanje.
Vendar pa lahko pride do težav z vezjem samodejnega vklopa, ki povzroči pokanje. Običajno je pokanje zaradi samodejnega vklopa znak okvarjenega vezja v sprejemniku.
Da pojasnim, ko spremenite načine poslušanja in globokotonec preneha pokati, to pomeni, da določen predizhodni priključek ni utišan ali da ni utišan dovolj dolgo. Glavni vzrok za to je lahko okvarjena dioda ali druga komponenta vezja v sprejemniku.
Dejstvo je, da je lahko moč v stanju pripravljenosti pri »vedno vklopljenem« skoraj tako nizka, kot je pri »samodejnem vklopu«, odvisno od ojačevalnika, zato morda ne bo bistvene koristi.
Nastavitve napajanja in pregrevanje
Rekli smo, da bi morali nastavitve moči nizkotonskega zvočnika preklopiti na vedno vklopljeno. Včasih to le začasno odpravi težavo, ker se včasih globokotonec pregreje, če je vklopljen 24/7.
V mnogih primerih lahko to pregrevanje povzroči pokanje. Ne pozabite, da so ojačevalniki v teh nadomestkih precej močni in se bodo precej segreli ter hitro izgoreli. Če je funkcija vedno vklopljena omogočena, ročno izklopite podomrežje, ko ni v uporabi.
2. Motnje brezžičnega globokotonca
Če je vaš nizkotonec brezžični, so lahko težave brezžične motnje. Brezžične motnje se pojavijo, ko signali sovpadajo in negativno vplivajo drug na drugega, kar moti ali oslabi signal WFi.
Ne pozabite, da je v vašem domu morda veliko naprav, ki oddajajo lastne signale in ne samo signalov WiFi.
Vaš usmerjevalnik, mikrovalovna pečica in mobilni telefon na primer oddajajo signale, ki lahko motijo signal nizkotonca. Pravzaprav je dandanes skoraj vse pametno, tako da lahko vaš pametni hladilnik, klimatska naprava, ventilator in drugo moti signal do podvodnika.
Če želite izključiti to težavo, hitro povežite nizkotonec s sprejemnikom, kar pomeni, da vzpostavite neposredno povezavo med subwooferjem in sprejemnikom s kablom RCA ali še bolje s kablom za nizkotonec.
Če težava izgine, potem ko ste napravo priključili, potem je težava v motnjah. Vse ima svoje meje in brezžična povezava ni nič drugačna.
Kako odpraviti brezžične motnje
Najlažja rešitev je, da pustite naprave neposredno povezane, če pa morate uporabljati WiFi, lahko poskusite naslednje:
- Premikajte podmornico po sobi, dokler pokanje ne izgine. Vendar pa je postavitev nizkotonskega zvočnika v domači kino pomembna, zato morda ni najboljša možnost. Nekateri ljudje imajo na primer radi nizkotonec za kavčem.
- Naprave WiFi premikajte naokoli, dokler pokanje ne izgine. Težavo bi lahko povzročalo veliko naprav, vi pa ne veste, katera, zato to morda ni idealna rešitev
- Zaščitite nizkotonec pred drugimi napravami. Obstajajo različni ščiti za wifi, s katerimi lahko podmornico zaščitite pred drugimi okoliškimi napravami, vendar ostane povezana s sprejemnikom wifi. Obstajajo dejanski ščitniki, ki jih lahko kupite, vendar najprej poskusite s folijo in preverite, ali deluje.
- Če imate veliko drugih brezžičnih naprav, se prepričajte, da nadomestni uporablja kanal, ki je čim dlje od drugih kanalov, ki se uporabljajo.
Vaša težava je lahko tudi pokvarjen oddajnik globokotonca. Če ste onemogočili vse naprave WiFi ali karkoli, kar lahko oddaja signal, in se težava nadaljuje, je to verjetno krivec.
3. Izklopite AV-sprejemnik in ojačevalnik
Povsem možno je, da sprejemnik ali ojačevalnik pošilja umazan signal globokotoncu, kar povzroča pokanje.
V tem primeru globokotonec morda pošilja "impulze" znotraj zvočnega signala iz neznanega razloga.
Če želite hitro preveriti, ali je to težava, odklopite kabel RCA ali kabel nizkotonskega zvočnika iz subwooferja na vratih na sprejemniku ali iz ojačevalnika, vendar pustite globokotonec vključen. Če težava izgine, je morda težava v sprejemniku ali ojačevalniku.
Vendar pa boste vedeli le, ali ima podmornica težave tudi v stanju pripravljenosti. Če želite biti prepričani, morate opraviti dodatno preverjanje. Na globokotonec morate priključiti drug vir signala.
Povežite drug vir
Priključite drug medijski vir, da nizkotoncu zagotovite drugačen signal. To je lahko predvajalnik DVD-jev, predvajalnik Blu-ray ali pravzaprav kateri koli vir neposredno v priključke RCA na hrbtni strani podvodnika.
Tukaj je, kako ga preizkusite:
- Zmanjšajte glasnost podojačevalnika do konca in začnite predvajati vir.
- Zdaj povečajte glasnost podojačevalnika, dokler ne slišite glasbe, in pozorno poslušajte. Če je pokanje še vedno prisotno, je težava v podojačevalniku. Če ne, pokanje prihaja iz sprejemnika ali morda česa drugega.
Raven nizkih tonov globokotonca
V nekaterih primerih je težava v sprejemniku, kar lahko pomeni okvarjeno vezje v sprejemniku. Hitra rešitev za to je, da lahko globokotonec nadzirate z nivojem nizkih tonov v sprejemniku.
Preverite sprejemnik in poiščite nastavitve, ki lahko vzdržujejo prave ravni nizkih tonov. To lahko resnično pomaga, ko nizkotonec poka pri visoki glasnosti.
Pokanje nizkotonskega zvočnika pri visoki ali nizki glasnosti
Pokanje nizkotonca pri visoki glasnosti
Če nizkotonec poka pri visoki glasnosti, je to lahko posledica težave s povezavo v nastavitvah ojačevalnika.
Preverite povezave in se prepričajte, da žice niso obrabljene ali da ni ohlapnih kontaktov. Preverite vse žične povezave z ojačevalnikom, zvočno tuljavo ali v samem globokotoncu.
Kar zadeva nastavitve, poiščite tehnika z osciloskopom ali DD1, da pravilno nastavi vaš ojačevalnik. Poleg tega upoštevajte, da naj bi se ojačanje ojačevalnika ujemalo s predizhodno napetostjo RCA vaše glavne enote.
Če želite izvedeti več, si oglejte naš celoten vodnik o pokanju nizkotonskega zvočnika pri visoki glasnosti.
Pokanje globokotonca pri nizki glasnosti
If your subwoofer is popping at low volumes, this indicates a connection problem or power mismatch. Check to ensure that there are no loose connections or melted wires.
4. Pulling Too Much Power From The Reciever
Is your receiver getting rather hot? For example, you may notice that the device stays cool say during a movie but get quite hot when you are playing channel music.
If your speakers are connected through your subwoofer and draw a lot of power, this may be the cause of the issue.
As your receiver or amp struggles, it will wear out over time and cause the popping sound. To fix this, get a good external amplifier to handle the demanding speakers.
5. Underpowering Your Subwoofer and Power Mismatch Clipping
Normally, underpowering your subwoofer is not necessarily a detrimental thing. All it means is that the sub won’t have enough power and so whatever is playing will sound weak and lack any detail.
However, it becomes dangerous when the sub is connected to an amplifier that’s being overworked and sending out a clipped signal.
What is a clipped signal? Remember sound waves are sinusoidal waves. Clipping occurs when these signals are squared. This happens when the volume of a source signal exceeds the electronic capability of a circuit. This ends up clipping the sound on every cycle.
For example, let’s say your amplifier cannot play a signal more powerful than what 1 voltage of electricity can produce.
Let’s say you increase the volume at the source, the amplifier still would not be able to produce sound greater than what 1V can produce. Instead, it would clip and distort the signal and eventually create a square wave.
When the clipped signal reaches the subwoofer, it tries to drive the sub it a way that the sub is not designed to handle. In other words, the popping noise occurs as the amplifier tries to produce more voltage than it can to meet the demands of the subwoofer, but the sub can’t manage that signal.
This is because the square signal will try to move the sub’s cone from all the way forward to all the way to the rear in zero amount of time, which is impossible and so the coil just stays stationary.
Current flowing through a stationary coil only heats up the coil. After some time, this may cause shorts and the cone may even tear, of the coil may jam in the magnet’s voice coil gap, killing the sub.
When this happens, the sub will start overheating which may lead to popping and burn out.
How To Fix Power Mismatch Issus
First of all, the simple first step is to refrain from underpowering your subwoofer. To do that, check that the power outage from the amplifier matches the subwoofer’s RMS.
An amplifier producing much less power than it should will of course lead to clipping, but also check if it’s producing more power than the subwoofer can handle.
Remember, the poping sound occurs because the signal is trying to get the coil to pop into position back or forth. More RMS power from the amplifier gradually heats up the voice coil and may burn it out.
Apart from popping, another result is that the glue holding the coil wire in place may melt under all the heat, and the coil crashes in its gap. A solution to this is getting a condenser that’s used to steady the power and transmit it out in stable currents.
In addition, keep in mind that a square wave carries twice the RMS power of a sine wave of the same amplitude. The effect of this is that in addition to telling the voice coil to pop into a position, it’s doing it with almost twice the power of the sub’s maximum capacity.
6. Voice Coil Shorting
In many cases, subwoofer popping is indicative of voice coil burns at specific areas. The voice coil is a very long string of copper wire wrapped around a magnet and attached to the cone.
When an electrical signal flows through the coil, it moves in response to the magnetic field produced and therefore movers the cone.
This movement is what creates vibrations or sound. This is how speakers and subwoofers work.
If the coil is burnt at any point, it will develop shorts which can cause the subwoofer to pop as the signal goes on and off. This is commonly the cause of the issue if the subwoofer is popping or cracking when no signal is provided (when not connected to the receiver).
7. Wired Connectivity Issues
If your subwoofer is wired, you could also have an issue with the wired connection. Over time, it’s not uncommon for speaker cables to loosen.
For example, it could be a lose RCA connection.
When the connection is loose, the current is interrupted; thus, leading to popping. This is especially true if the subwoofer pops and hums.
8. Replace The Cables
As already mentioned, subwoofer popping or cracking is almost always the result of an interrupted electrical signal.
Old, worn out and broken cables with shorts can often cause interruptions in electrical current including audio signals. 
This could be as simple as replacing the RCA cable or the subwoofer cable.
A quick way to troubleshoot this issue and find the actual source is by going along the cable to see if there are any loose connections. Just simply wriggle the wires while playing audio and you may very well find where the loose cable/connection is.
In fact, you may very well not need to change the cable, you may very well just need to re-solder the connections if it’s clearly a broken cable. It may be simpler to replace the wire entirely, however.
Remember, subwoofer popping and cracking is almost always the result of a current or signal interruption between the audio source and the subwoofer driver.
In addition, a loose connection may also exist in the wire connections to the amplifier, voice coil, or in the subwoofer itself. Carefully check all these wires and ensure that none of them are loose or melted away. Wires connecting the speaker cones and voice coils should also be checked and tightened.
9. AC Power Issues
Sometimes dirty power can cause a subwoofer to pop. Remember, AC power is a sinusoidal wave and various issues can cause changes with the pure sinusoidal wave to some points within the circuit in your house. Just try a different outlet in a different room and see if that helps.
10. Subwoofer Pops When Volume Is Down?
In many cases, your subwoofer may be popping when the volume is down. If your subwoofer is popping as long as the sub is powered on, you are likely dealing with a bad amp.
In addition to that, as we have mentioned before, if the subwoofer is popping or cracking when no signal is provided, the likely cause is a burnt-out voice coil.
Pogosta vprašanja
Subwoofer Popping Every Second
If you hear a popping sound on your subwoofer every second, this is likely due to a power mismatch in the circuit. It occurs as the amp tries to augment its voltage to meet the demands of the subwoofer. As a result, the sound you get on every cycle is clipped.
However, this is not the only reason your subwoofer will pop while playing music. The noise may also come from the loose connections in your circuits. Check and ensure that the speaker wires are not loosely fixed, electrical cables are properly fixed, and the plugs at the power outlets are correctly fixed to the mains.
In addition, the subwoofer will also pop when you are changing inputs on the receiver. Because the sub only reproduces the signal it gets from the AVR, it should mute all the pre-out jacks when the receiver loses the audio signal.
If you hear the pop when changing inputs or listening modes, it is a sign that a particular pre-out jack is not being muted and is a sign of a failed circuit in the receiver.
Some of the fixes include adjusting the gain control on the sub to control the bass while reducing the pop, checking the input settings for each input device used, and setting an AUDIO INPUT setting to a specific audio signal not “Auto,” or service the receiver. Also, check that the power outage from the amp matches the RMS of the sub.
Zaključek
When your subwoofer is exhibiting popping and cracking sounds, there could be a wide range of causes.
The most likely issues are a bad voice coil, the auto on feature, the amp/receiver or the actual connection cables.
In any case, the issue can certainly be fixed if you take the time to go through the troubleshooting and find the actual cause. Good luck!