In normal quiescent (sp) state they are biased on. The common claim that amplifier clipping destroys speakers is (in and of itself) completely false. What causes fluttering in the ear? 5.Does your computer sound still work? .... ....maybe the amp just amplifies the circuit noise or something...?.....? Sorry for the hijack but i think the speaker amp has blown in my Medusa headphone kit. Caps charging, caps discharging, flux capacitor spin up, electron spin discontinuity variance? Does the receiver have plenty of breathing room? Search the community and support articles. There's not much you can do about it though as the decision was made by Adcom not to engage a muting circuit upon power down. At this point in time output is in an unknown state. Hearing constant noise in your ears is not normal and may indicate a medical problem. So all the transients from start up have occurred before the cathode gets hot. Spark or brief electric arc caused by main power on/off switch of power amplifier. I suspect the problem is not seen in tube amps. If the thumping occures in the headphones at this point, you may have a bad sound card. 2. In some cases (such as tweeters and compression drivers), power below the minimum recommended frequency can (and does) cause damage. Overloads are usually caused by too much heat. If you have an account, sign in now to post with your account. The most obvious in the case of a tube amplifier are the tubes. This thread is locked. Some high end audio systems are not affected, but intercoms,switching systems, and multi-channel systems are often affected. Display as a link instead, × The pre has a warm up mute feature and it still thumps. It may be that a cap which couples stages has become leaky. The reason is that the heaters take a while to heat up. Activating mute well after the warm up cycle is finished produces the thump also. There are 2 causes for this loud thump. Tinnitus might manifest itself in other methods than the familiar ringing, hissing and ringing sounds in the ear. When in normal use, there is one thing that destroys speakers - excessive power. Paste as plain text instead, × It is driving me crazy. Everyone can appreciate the value of a good subwoofer in a home theater system. To determine … There can be several of causes for this. It can get pretty loud, especially if you are not expecting it. But it takes a while for the filter caps to get charged up to full voltage. What is fluttering in ear? Of course at shut down, it takes a while for the caps to discharge. Therefore there is energy to make the thump, but that energy certainly doesn’t get dumped. That may be part of the thump. 1. The noise may also be due to loose connections in the circuit. You can post now and register later. When you power up, certain circuits will go from zero volts to certain set voltages to stabilise and will make the output "speaker terminal" to change potential, this is what causes the "thump" on the speaker output as you turn on/off the amp. What? Where Speaker Noise Can Come From. It's very frustrating not knowing what it could be. Even if the amplifier is not DC coupled (which is almost all of them), all the harmonics of the step function (the DC level shift) are still there and you hear the pop. Every time the amplifier is switch on or off, a spark jumps across the gap. Even if the preamp has muting relays, if there is a persistant DC offset, when the relays close you will still get the pop. It's possible the thump will harm your speakers. [insert a bunch of technical explanation here]. The sound may be mild or severe.   Your previous content has been restored. If the thumping occures in the headphones at this point, you may have a bad sound card. So they don't start working until the forward voltage gets above 0.7 volts. Broadly speaking, we can break them down into three categories: problems that originate from the physical speakers, the cable connection, and from the PC itself. There is a slow ramp up not seen in transistors. Each time the amplifier is switch on or off, a spark jumps across the gap. Another break: I hooked up the speakers to a portable tv, and the sound is clear and loud again. The "Auto" setting can cause the receiver to take a little longer to "lock" on to the audio signal. Check the remote wire first off. SS diodes. × I believe it is related to power supply voltage ramping up at turn on. Tinnitus is usually a symptom of a pre-existing condition in the body. 7.Connect some headphones to your speaker out on the computer. Getting good reproduction of the lower end of the audio spectrum gives sound a more full and realistic quality, and at the lowest audible frequencies and below, a subwoofer adds a tactile quality to home theater -- some things are not so much heard as felt. I muted the master volume, and the thump is still there. There are op amps in the preamp, and when the power supply caps charge up, there is a point where the op amp will turn on. I used a proper speaker … It can be described as hissing, roaring, bowing, buzzing, humming, whistling or ringing. Luckily, the most common issues are fairly obvious. Speaker crackling is almost always caused by a connection problem. There are op amps in the preamp, and when the power supply caps charge up, there is a point where the op amp will turn on. Good question....maybe it's the same reason my amp or receiver being used as a pre thumps through the speaker? I also thought it might be the foundation of my home slowly sinking and suddenly shifting. Hearing a thumping in your ears, also known as pulsatile tinnitus, can be caused from Meniere's disease, which can affect your balance and hearing. Pulsatile tinnitus causes a rhythmic sound in your ears. I plugged it in through an cabinet loaded with an 8ohm 200 watt 15 speaker. Learn what to do about eardrum spasms. Old PA guy rules, power up through the signal chain (amps last), power down using the reverse of signal chain. I thought, maybe be it's my computer's BASS/Woofer speaker "popping" due to some kind of malfunction in the electronics or power line condition. On an preamp/amp intermittent crackling can be caused by a few different things. I bought a little t-amp lepai 2020a+ and a pair of polk monitor 30s for my pc set up. Hey yall Wondering if anyone can help me diagnose this: I just got a used Gallien-Krueger 400RB bass amp head (older small-box version) off Ebay. Take this thread to Cuba! and How to Stop It. Not all equipment is affected. The transformer and rectifiers turn on immediately. 4.Have any of the speaker connections been changed or remoeved for any reasons prior to them making these sounds? Music playback from a computer has crackling noises or gets interrupted There is no sound from the rear speakers when connected to an active subwoofer. I'm not sure how that fits in exactly. To fix the error, check that the power outage from the amplifier matches the subwoofer's RMS. desktop? if the amp is tripping it will cause this to happen. A speaker is not producing any audio, or is making a popping, crackling or fuzzy sound. The causes of exploding head syndrome aren’t fully understood. Even a battery power supply - the energy is in the batteries. Gliderguy, December 20, 2005 in Technical/Modifications. Oh yeah. You can follow the question or vote as helpful, but you cannot reply to this thread. There are two basic types: 120Hz buzz, typically caused by ground loops, and 60Hz hum, typically a result of poor shielding, cable problems, or close proximity to strong magnetic fields. leave your speakers on but disconected from the computer, if thumping still occures its entirely the speakers. Posted December 27, 2005. It can't thump, as you always turn it on before the power amp, and turn the amp off first. Numerous know this feeling from sports or other laborious activity where they experienc… The challenge- the bad connection could be in a number of different places, some easier to address than others. []. 1. DC offsets happen for a number of reasons from design to drift. Quick question. First, you should determine the type of hum you are dealing with. They are basically diodes, in part. This usually results in a rattling noise. 8.If Not, verify all your connections: power supply, subwoofer connections (if this is a 2.1 setup), input etc. When I turn on or off the amp my speakers make a quick pop sound. There might … Powered by Invision Community. Someplace between your amplifier and your speaker driver, there’s a bad wire which is causing the driver to move abruptly, causing interference. Although some people like trying to stop subwoofer hum by using a power conditioner, in most cases it doesn't help [source: Lofft].Instead, try the following steps to stop subwoofer hum. 3.When did this begin happening? Thumping in the ear is like a twittering sound, whistling sound or another type of sound but it will match your heartbeat. Some experience, rather, a thumping sound in the same rhythm as their heart beat. Volume is turned all the way down and source material is on. My headphones/speakers don't "pop" so much as there's a kind of "thump" when the PC shutsdown, imagine it's the same cause though. Read below for more information on causes and treatment options. If the amp is direct coupled, meaning no capacitors in the coupling stages, then DC offset will be there. 7.Connect some headphones to your speaker out on the computer. The thump is caused by a DC transient that gets through to the speakers. An eardrum spasm could be caused by contractions in the muscles that control the tension of the eardrum. If not now, in a few years as the capacitors age a bit more. Other causes of pulsing in the ear include earwax buildup or temporomandibular joint dysfunction disorder. … Try setting all your speakers to small (if they aren't already). × 8.If Not, verify all your connections: power supply, subwoofer connections (if this is a 2.1 setup), input etc. unplug the subs and turn the headunit on. 6.Do you have an aftermarket soundcard or a built in sound card? Although this …   Your link has been automatically embedded. We have to look at how transistors work. This spike is then transmitted through the audio system, amplified, and passed out to the house speakers. In my experience, the thump problem develops in older amp. A common problem that faces some users of Windows 10 is delays in the audio output. Is this a laptop or At this point in time output is in an unknown state. I am wondering if it's the mute relay pushing some DC into the circuit. leave your speakers on but disconected from the computer, if thumping still occures its entirely the speakers.   You cannot paste images directly. Now the feedback sets about correcting the output of the op amp (very very quickly, I might add) and there is a DC "level shift" on the output of the opamp, which is fed through the amplifier. But as the power supply comes up to full voltage, they suddenly come alive. I received it today.   Pasted as rich text. Sometimes, it can also disturb the blood flow in the body. If you have to dump 35 J into a speaker, you may blow it or the output transistors of the amplifier. The first is that the speaker itself is damaged or being over driven. I've got one. Audio gear components can emit a power spike, which is heard as a POW, POP, or THUMP, when they are turned on or off. I don't recall, didn't the GFA 555 have a speaker selector switch you could disenage? Then when you turn it back on, current starts to flow until everything is full again. A damaged speaker has suffered a warping, tearing, or misalignment of the cone. If that 35 J is dumped in 12.5 ms (80 Hz thump), you’re expecting 2800 W to go somewhere. I’m aware of the following potential causes for the loud thumps. By Clear editor. (the caps get charged, which results in some flow of current - and then inductors present large voltage swings as the current changes too). Note: Your post will require moderator approval before it will be visible. I've heard slight poping sounds when turning on other speaker sets (smaller speakers) but they never sounded as loud as my issue now. This is why you turn things off and there is a slow fade of sound. This delay may exceed the time the pre-out jack is muted----and you … A power mismatch is not the only issue that causes a popping noise from the subwoofer. Whether loud or soft, ear noises can be disturbinig and need immediate medical attention. Also make sure the speaker wires aren't shorting and making good connections. What happens within the pre amp's circuits that produces this. This guide features a number of common issues faced when playing audio in Windows 10 and a possible […] If the noise comes from your amp or it is making intermittent crackling type noises (especially in tube amplification), noises that can come and go or be triggered by certain notes/frequencies or peaks. Upload or insert images from URL. It’s something that can usually happen most with vinyl, particularly where the low frequency resonance of the arm/cart combination falls within the audio band, usually as a result of a compliance mismatch. You listen to music through an amplifier, then switch the source to a different input and hear a loud click or "thump" in the speaker system. when you put the subs back on … 2.What kind of speakers? Copyright © 2019 Klipsch Group, Inc. What would cause a through the speaker 'thump" when turning on a preamp? Thanks for your feedback, it helps us improve the site. People experiencing this so-called pulsatile tinnitus often or constantly hear their own pulse hammering in their ear. This is called pulsatile tinnitus. There are dozens, maybe hundreds of explanations for unwanted sounds coming from your speakers. I was looking not for a way to prevent it but more for the root cause of the thump. 1) Sparking caused by main power switch of power amplifier. Ideally when you turn off any piece of gear, everything discharges. While Windows 10 brings many considerable improvements to audio and video features and performance, it also appears to have its share of bugs and idiosyncrasies. If the thumping occures in the headphones at this point, you may have a bad sound card.