Question about Adcom GFA-5500 2-Channel Amplifier

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When turning on you hear thumping sound from speakers turning off aswell i am using very efficient speakers

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This sounds like an electrolytic capacitor that's discharging. Follow the wires from the speaker terminals in the amp to the PC board. This should lead you to the main amp board. If you look around it you might see what is called speaker coupling capacitors. I reckon they could be a bit larger than others and be around 220 to 470UF or perhaps higher. These capacitors will be the last thing the signal goes through before the output goes to the speakers. They can cause that. Otherwise it could be a capacitor in the power supply section.

Posted on Aug 24, 2010

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Makes large thumping/chirping noise when turned on. Its not even connected to the receiver


Since you have said the speakers make this sound when "turned on", I'm going to assume there's some form of power amplifier attached (internal, external or otherwise). Based on the minimal information provided here, this simply sounds like the normal reaction of a speaker when the amplifier is turned on. In short, an audio speaker is a type of "transducer" and when power is applied (thru some form of amplifier), the cone reacts to the power surge and causes a thump, pop or other noise. Turn on your TV for example and you'll usually hear a small pop from the speakers...and a larger/more powerful amplifier is likely to make a louder noise. Without further information, in most cases this is quite normal.

Assuming there is an external power amplifier, my advice would be to turn the volume on the amp (regardless of whether there's a receiver connected) to 0 before turning the power on. If it still makes such a noise, it's possible the volume control of the amp may require cleaning.

Good Luck!

Apr 01, 2016 | Audio Players & Recorders

1 Answer

Why when i turn off my car makes a loud sound on the subwoofers


what Adcom says on their site.

There are usually two reasons for this: The amp has a large power supply and it doesn't use output relays. Let's look a bit more closely at both.

First, a power supply's job is to filter and store energy until the amplifier circuitry needs it. amps have HUGE power supplies. That's part of the reason they sound as good as they do. But when you turn the system off, that energy has to go somewhere. The "thump" you occasionally hear is the power supply capacitors dissipating the energy. It's not dangerous at all. In fact, it's just another sign that the amp won't run out of steam when you really want serious sounds.

Yes, we could have used output relays that would disconnect the speakers as soon as the amp turned off. That way, you would never hear the thump. But relays, as we've already seen, aren't great for real high fidelity sound quality. If we used them, you would never hear how good our circuitry is either. Is that a sensible tradeoff? We sure don't think so.

Mar 11, 2016 | Audio Players & Recorders

1 Answer

No sound from radio. When the power is turned on I hear a thumping noise from the speakers. What might be the problem? My car is a 2007 Lexus Es 350.


The thumbing noise is an out put if you hear it over the speakers.
So that means the problem is with a CD or cessette player that you must have that will not pop back to the raido mode

Apr 02, 2015 | 2007 Lexus ES 350

1 Answer

Is it normal for a thump when turning on active mackie speakers


Yes, it's normal. You can probably turn the speaker volume down to minimum before turning them on to minimize it.

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1 Answer

Sound system makes a thump thump noise


Your speaker is now blown.. Replace the Speaker and you will get sound back instantly. Happened to my Drivers Speaker last week, replaced the speaker and life is good again.

Mar 01, 2014 | 2010 Kia Soul

1 Answer

Hi.. I have a bose wave ipod docking system.. the sound is amazing.. or was... until a few weeks back when i noticed that in order to hear my ipod... i had to tweak the ipod a little on the docking...


Are you using a voltage adapter of some kind to convert the ireland standard 220VAC to the USA standard 120VAC that this device uses? Over voltage can deplete an electronics life very quickly.
By the sound of the "thump-thump-thump" noise emitting from the device, you may have a broken ipod dock connector, or a short somewhere in the connector/wiring/device itself, or the ground has failed.
By the description of having to "tweak" your ipod to hear it, it sounds like you've slowly broken the dock connector. Check to see if it moves easily, or if you can hear anything loose.
This is more than likely fixable, but it's probably easier to replace the device than to fix a broken connector.

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3 Answers

Thumping sound


You either have a bad ground from your amp to the vehicle or a problem with the amp. Where is the amp grounded? Do not ground an amp to a seat bolt or side panel on any vehicle. The weld points on the car itself cause issue with ground. Take the ground wire directly thru the bottom panel (floor) Check befor you drill! don't hit a wire/fuel line, etc. That will give you a solid ground. Keep your ground wire length to a minimum. 18" or less, and use the same gauge wire for ground as you do for power. Hope this helps

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1 Answer

My subwoofer (Altec Lansing[AVS500]) is always makeing a thumping


You could only verify this by gaining access to the rear of the speaker but I suspect that the 'spider' has come unglued. This is a device that surrounds the lower (inner) end of the cone to provide a second point of suspension; without this, the voice coil can slap against the side or bottom of the magnet structure.
I don't think a repair is an economical choice for these; repairs only make sense for 'professional' speakers that cost several hundred dollars to replace.  

Apr 13, 2009 | Altec Lansing 621 Computer Speakers

3 Answers

Mobile phone Samsung U700. No sound


Mobile phone Samsung U700.
No sound on the speaker. However, there is sound on headset

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1 Answer

No sound through the speakers...


It may be the PS3
you have to select Optical Out 5.1 etc first.
That PS3 is not user friendly at all.


Colin Graham.

Oct 22, 2007 | Audio Players & Recorders

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