How Can I Silence My....Speakers?
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How Can I Silence My....Speakers?
I have a set of Creative Inspire P7800 7.1 speakers. They are great for the money ($80 when I bought them a couple years ago). However, they are very susceptible to interference from EMF-generating devices such as cell phones. When it was only a problem with cell phones, it was not so bad as the problem only presented itself if the phones were near the speakers or if someone in the room was on the phone.
Now I've had to replace my router because it was failing; the new router is a great Cisco router with VPN and Draft-N wireless w/multiple isolated SSID's. Unfortunately if I enable the wireless, the interference with the speakers is CONSTANT.
I am wondering what it would take for me to insulate the speakers from this interference? Any ideas?
Now I've had to replace my router because it was failing; the new router is a great Cisco router with VPN and Draft-N wireless w/multiple isolated SSID's. Unfortunately if I enable the wireless, the interference with the speakers is CONSTANT.
I am wondering what it would take for me to insulate the speakers from this interference? Any ideas?
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Re: How Can I Silence My....Speakers?
Probably shielded wires?Fëanor wrote:I am wondering what it would take for me to insulate the speakers from this interference? Any ideas?
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I have the same problem with my 2.1 Empire R401 speakers (wooden speakers and subwoofer), and I believe the shieldless wires are the problem.
But I couldn't find audio quality shielded wires, the ones I have are black & red. I suppose I could use TV coaxial cable instead? Or some other kind of shielded cable?
If you people know where to find audio quality shielded wires, please post a link here.
PS. Would this be OK? http://www.amazon.com/Channel-Spiral-Sh ... 180&sr=8-8
But I couldn't find audio quality shielded wires, the ones I have are black & red. I suppose I could use TV coaxial cable instead? Or some other kind of shielded cable?
If you people know where to find audio quality shielded wires, please post a link here.
PS. Would this be OK? http://www.amazon.com/Channel-Spiral-Sh ... 180&sr=8-8
Well, that is easily tested - if the cables can be easily rerouted/moved. My money is on the cablesswivelguy2 wrote:It's probably actually the insides of the speakers that are lacking shielding, rather than the wires.
*idea*
But the OP did check the sources, right? I know that e.g. my cellphone does interfere with my tuner if I get too close...
Are those speakers passive or active? Google returns a lot of languages I do not understand... If they are active you could use coax cables, for passive ones the diameter of coax cables is a bit small.Tzupy wrote:I have the same problem with my 2.1 Empire R401 speakers (wooden speakers and subwoofer), and I believe the shieldless wires are the problem.
But I couldn't find audio quality shielded wires, the ones I have are black & red. I suppose I could use TV coaxial cable instead? Or some other kind of shielded cable?
If you people know where to find audio quality shielded wires, please post a link here.
PS. Would this be OK? http://www.amazon.com/Channel-Spiral-Sh ... 180&sr=8-8
The link you provided does not mention the diameter/core material of the cable - could be anything.
My speakers are 8W each and the subwoofer 30W RMS power, so a total 46W. I believe the speakers are passive, since they are fed with only 2 wires.
The speakers are magnetically shielded and have '3.5" mid-range and 1" tweeter', the subwoofer has an 'inverse phase hole 6.5" driver'.
The PC connection is a jack, splits into a 2 channel RCA and goes into the subwoofer case (these wires also don't seem shielded).
From the subwoofer each speaker receives the signal through a pair of black / red wires with NO connectors at their ends, they're just clamped to make contact.
The speakers are magnetically shielded and have '3.5" mid-range and 1" tweeter', the subwoofer has an 'inverse phase hole 6.5" driver'.
The PC connection is a jack, splits into a 2 channel RCA and goes into the subwoofer case (these wires also don't seem shielded).
From the subwoofer each speaker receives the signal through a pair of black / red wires with NO connectors at their ends, they're just clamped to make contact.
Yeah, that means they are passive. And with 8 W you can probably run them from coax without a problem.Tzupy wrote:My speakers are 8W each and the subwoofer 30W RMS power, so a total 46W. I believe the speakers are passive, since they are fed with only 2 wires.
The speakers are magnetically shielded and have '3.5" mid-range and 1" tweeter', the subwoofer has an 'inverse phase hole 6.5" driver'.
From the subwoofer each speaker receives the signal through a pair of black / red wires with NO connectors at their ends, they're just clamped to make contact.
But as mentioned, check your sources first. Best way to do that is imhO with a MP3 player.
First of all, I apologize for hijacking this thread from the OP, this wasn't my intention.
Second, my problem isn't permanent, I haven't a wireless router, and I won't get one if I have a choice.
The interference is with the mobile phone, a cheap Samsung that I use for local calls. And sometimes with a radio station.
I also have an iPhone (for international calls), but it doesn't cause this kind of problem.
The PC case is Solo / P150 (I have two PCs) and it's intact, no case maiming here. Case fans are Slipstreams at ~700 rpm.
I tested with a Sony laptop and the problem with the interference speakers / mobile phone is the same.
I ordered quality shielded cables, jack to RCA and two stereo RCA cables, I hope they will solve my problem.
Second, my problem isn't permanent, I haven't a wireless router, and I won't get one if I have a choice.
The interference is with the mobile phone, a cheap Samsung that I use for local calls. And sometimes with a radio station.
I also have an iPhone (for international calls), but it doesn't cause this kind of problem.
The PC case is Solo / P150 (I have two PCs) and it's intact, no case maiming here. Case fans are Slipstreams at ~700 rpm.
I tested with a Sony laptop and the problem with the interference speakers / mobile phone is the same.
I ordered quality shielded cables, jack to RCA and two stereo RCA cables, I hope they will solve my problem.
Nope. The problem is (likely) that a small signal is being induced on the lines and being amplified.Cistron wrote:I don't think the interference happens in the cables if they just lie straight. Doesn't this need an inductive coil to produce a current?
I have personally always found my "cell phone noise" comes from the wire between the sub and the computer. The sub's coil is almost always shielded (hold it up to a CRT to test?), though the PCB for the amplification probably is not.
Edit: PS if you are thinking about the fields, consider that the wire is not perfectly straight and will have some "area" for flux. Also the field change is non-uniform so even symmetric wire curves will generate different EMFs.
Awesome, thanks for your suggestions you guys.
The case is an Antec P182 that's heavily lined with AcoustiPack sound-absorbing foam. I'm not sure much EMF is getting in there.
Based on all your input I'm pretty sure the subwoofer itself is the problem, and is amplifying the interference to the speakers. I can place my phone near the speakers or the wires and get little to no interference, but if I place my phone near the subwoofer it is significantly worse.
Because of the setup of my furniture I am very limited when it comes to placement options for the subwoofer; it's pretty much stuck where it's at.
Technically I could move the modem and router another ~5 feet away, but that seems like a temporary workaround rather than a solution. If I am able to open up the subwoofer, what could I line the inside with to shield it? The anti-static bags are definitely a possibility, although I was thinking more along the lines of lining the inside with chicken wire to create a sort of Faraday Cage.
The case is an Antec P182 that's heavily lined with AcoustiPack sound-absorbing foam. I'm not sure much EMF is getting in there.
Based on all your input I'm pretty sure the subwoofer itself is the problem, and is amplifying the interference to the speakers. I can place my phone near the speakers or the wires and get little to no interference, but if I place my phone near the subwoofer it is significantly worse.
Because of the setup of my furniture I am very limited when it comes to placement options for the subwoofer; it's pretty much stuck where it's at.
Technically I could move the modem and router another ~5 feet away, but that seems like a temporary workaround rather than a solution. If I am able to open up the subwoofer, what could I line the inside with to shield it? The anti-static bags are definitely a possibility, although I was thinking more along the lines of lining the inside with chicken wire to create a sort of Faraday Cage.
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Fëanor:
Check the power feed from the powerpack for the Subwoofer vs the audio signal feed from the PC.
...and please do get back to us with your troubleshooting results...
Check the power feed from the powerpack for the Subwoofer vs the audio signal feed from the PC.
...and please do get back to us with your troubleshooting results...
Last edited by Wayne Redpath on Sat Jan 30, 2010 4:59 pm, edited 1 time in total.