View Full Version : Popping Sound when thunder Hits, Cracking and grumbling during bass.

03-16-2007, 02:55 PM
Whenever I am watching a TV (I have standard Cable service). A popping sound comes from the center channel speaker when thunder hits or large bangs hit. I looked to make sure the positive and negative wires aren't switched and they are correct.

Whats causes this popping sound?


03-16-2007, 03:07 PM
Could be you have a voice coil going bad.

Have you tried running a different speaker as your center channel?

If another speaker does the samething, its a good bet there is something wrong with your amp/receiver

03-16-2007, 03:17 PM
Could also be that you are overdriving the speaker, making it hit its limits. Reduce the base to that speaker and see if things don't improve.

Rich P

03-16-2007, 08:27 PM
When thunder hits, and you can't put two and two together. It's some electrical noise coming in from the cable most likely. When I sold computers, I always tried to sell battery backups to people with cable. Although the cable lines are supposed to be grounded, many times they are not.

In my consulting business, most of my customers who lost computers had them fried not by the electrical side, but by the cable side. So I always recommend a UPS with the ability to protect the cable side. I know that the APC 650 and 725 models have that connection. I don't buy anything else but APC but I am sure there are other manufacturers that have the same capabilities.

If you are on cable, RUN and don't walk and get yourself a battery backup with protection.:scratch2:

03-16-2007, 10:22 PM
I have satellite and a few channels do this periodically. There is distortion in the signal and the Pro-Logic decoder just emphasizes it.

I would say the problem is with your cable signal or possibly whatever you are using to demodulate the signal. (ie. vcr? cable box?)

Your Pro-Logic decoder might be emphasizing the problem by sending the crackle to the center channel. You might not even notice the problem in stereo mode.

You could try using a different cable box or VCR to tune in your stations. If you have several splitters on your cable feed, that could be a problem.

EDIT: I assume you are talking about loud passages in the audio. Not real thunder outside?

03-18-2007, 12:48 PM
I am talking about thunder in the movies or on tv that causes this popping sound. I will have to conclude that this speaker is popping because of too much power, going balls deep. Pretty sure, I noticed I had my amp turned to "LARGE" for center channel. I changed it to small and haven't hearn any popping so far.

The center channel is a Eposome brand. A friend gave it to me and said it was really high quality. I cant find the Ohm rating on it! The back just has connectors and thats it. Can you identify this speakers brand and independence? Here is a picture.

My Setup Includes...

- Yamaha HTR-5140 Receiver
- Cerwin Vega VS12 series floor speakers
- Eposome? Unknown Center speaker

The green circle is what I currently have my receiver switched to. The Cerwin Vegas are 4Ohm Each. Is this correct? What would happen if I put it on the other switch?

Thanks for helping me identify that speaker and answering all my questions.

03-18-2007, 01:10 PM
I can never find anything on the web for eposome brand. There was a pair at a local thift store for $200. And though they looked good, I had no idea if they were worth that. And since I didn't need another pair of speakers, I let them pass.

03-18-2007, 01:13 PM
My guess is that the "thunder" signal coming from the power amp has too much low frequency extension for your center channel's "woofer."

Is "loudness" engaged? If so that might give too much boost to the LF for your center. Also, the MCH setup for your speaker may need the selection of the center changed to "small speaker." If it is set at "full range" now, the signal processing is allowing full range signal.

03-18-2007, 02:44 PM
You are bottoming-out your woofers! That is exactly what it sounds like when a voice-coil slams againts the magnet inside of your speaker. :yikes:

You need to turn-down your stereo, or turn-down your bass, or you are going to cause permanently damage to your drivers.

03-18-2007, 05:52 PM
I have a friend with that center channel speaker. The brand name is Eosone and the center channel speaker is 4ohm. They made bipolar speakers and you have a tweeter mounted on the rear of the speaker. I remember Best Buy selling these in the late '90's as their premium line of speakers. I think they were bought by Polk and no longer exist.

03-18-2007, 07:02 PM
Ah-ha! That's what they were! Thx! Just like these:

03-18-2007, 07:55 PM
Thanks for making that clear, Its Eosone not Eposome like I thought.

I believe I have found my center channel Speaker~!~! (Eosone RSC 300)

I took the large setting and changed it to small, Everything seems to be OK now.

Thank you.