|
It is currently 18 Apr 2024, 11:46
|
View unsolved topics | View unanswered posts
|
|
|
|
Author |
Message |
samaron
|
Post subject: Buzzing sound from speakers - normal? Posted: 17 Feb 2016, 18:18 |
Advanced fan |
|
|
Joined: 05 Jul 2011, 15:10 Posts: 898 Location: Norway Has thanked: 0 time Been thanked: 5 times
|
Hi!
I recently did some changes to my surround setup at home. One of them being that I introduced a power amp to drive the "new" stereo speakers in the front. When it is powered on, I do hear a buzzing sound coming from the speakers. It stays constant. It isn't loud, but I can hear it from my sofa three meters (~10 feet) away if there is no or very low sound input. This can't be 50Hz hum, since I do hear the same buzzing in both the mid-range and tweeter too.
The speakers are adjusted to 75 decibel using a SPL-meter set to C and slow. Speaker distance is measured and added to the AVR configuration. All speaker wires are 2,5mm2 (~13 AWG). The power amp gets the signal from the left and right (RCA) pre-out on the back of the AVR.
A list of the equipment: Yamaha RX-A2020 AV receiver Cerwin Vega CXA-8 (power amp) Cerwin Vega VE12 (stereo front) Cerwin Vega XLS-6C (center speaker) Cerwin Vega XLS-6 (surround back) Cerwin Vega XLS-15S (active subwoofer)
I've unplugged everything, leaving just the power amp connected. It was the only thing powered on with only the speakers connected. I removed the RCA inputs to the amp as well. No change. I connected the speakers to the AVR and had no buzzing then. So something is going on with the power amp. The curcuit breaker trips very often (almost every time) when I power on the amp. That is a different issue, though. The buzzing is also slightly lower on the right speaker. I have tried moving around the speaker wires, having them at least 1 meter away from any mains, but it didn't change anything.
The electrical installation is from the 80s, so it isn't grounded. It is also an open installation, meaning the wires go on the outside of the wall. Not sure if this buzzing would go away if the amp were grounded.
Is it normal to have some buzzing coming out of the speaker when using a power amp? If I crank the volume all the way up on my AVR, I do get some hiss from the tweeters in the other speakers. This is, as far as I know, completely normal. What bothers me is the buzzing from the stereo speakers.
_________________ Player: Pioneer HLD-X9 and CLD-2950 My LD collection Recently started collecting some anime on LD
|
|
|
|
|
samaron
|
Post subject: Re: Buzzing sound from speakers - normal? Posted: 18 Feb 2016, 15:32 |
Advanced fan |
|
|
Joined: 05 Jul 2011, 15:10 Posts: 898 Location: Norway Has thanked: 0 time Been thanked: 5 times
|
Hooked up the scope today. I'm not that experienced with troubleshooting and interpreting signals. It does look a bit noisy, though. The scope was set to 10mV/division, 5ms/division and AC coupling. It is connected to the amplifier output (speaker disconnected). Have to correct my self a little bit. The noise does get slightly louder when volume set to full. Below that, it does appear to stay constant. Volume set to full: Volume set to half: Volume set to lowest:
_________________ Player: Pioneer HLD-X9 and CLD-2950 My LD collection Recently started collecting some anime on LD
|
|
|
|
|
invenio
|
Post subject: Re: Buzzing sound from speakers - normal? Posted: 06 Apr 2016, 22:35 |
Advanced fan |
|
|
Joined: 21 Sep 2011, 15:15 Posts: 743 Location: NH, United States Has thanked: 5 times Been thanked: 27 times
|
samaron wrote: Can't really be a ground loop when there isn't any grounded outlets. I'm presuming you don't have any other components connected to a potential ground (like a cable television coaxial cable through a cable box, ethernet port, grounded antenna, etc)?
_________________ My Home Theater Gallery Laserdisc Collection Storage
|
|
|
|
|
|
|
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot post attachments in this forum
|
|