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Topic: 12 in. Speaker: |
Kenneth P. Jones
From:
South Carolina, USA
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Posted 15 Jun 2012 6:40 pm |
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I have 2 twelve in. speakers with 4 ohm and 1 has a
hum or noise. What would cause this Hum? Is it the
speaker or what? Any help? |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 15 Jun 2012 7:07 pm
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speakers normally don't get involved in causing hum... we'll call it 'noise'.
The way to test a speaker is to very lightly push the cone in and out (with splayed fingers, carefully!) and listen for rubbing... if it's rubbing, the coil has been toasted and a recone is necessary.
You can also tell a toasted speaker by the DC resistance... it will rise. If your speakers are supposed to be identical, see if they don't differ by an ohm or so... yep, toasted. You can often smell the burnt voice coil. |
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Richard Rice
From:
Illinois, USA
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Posted 16 Jun 2012 5:39 am
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Although I have used the tried-and-true method of pushing the cone in and out, (thousands of times) it is a far safer practice to test with an ohmmeter. It is possible to damage the voice coil by physically pushing on the cone, especially on speakers with very close internal tolerances. I no longer do things this way.
_________________
'84 Marlen Custom D-10, 8X4
Oahu Tonemaster 6 string lap steel
Rice Custom 6 string lap steel
Republic Squareneck Tricone
Homebrew 6 string reso
10 string Melobar- Rice modified
Rice Custom 8 string reso (under construction)
Hohner 6 string lap guitar (acoustic)
Kustom K-500 tuck & roll
Peavey Century
Peavey Vegas 400
Peavey CS-800
Bag End custom 1X12 & 1X15 cabs w.EV drivers
Steelin' thru a '72 Vibrosonic Reverb and a '69 Dual Showman Reverb (Stereo) |
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Tom Wolverton
From:
Carpinteria, CA
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Posted 16 Jun 2012 6:17 am
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What about a 9V battery?
_________________
To write with a broken pencil is pointless. |
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Richard Rice
From:
Illinois, USA
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Posted 16 Jun 2012 7:20 am
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That's a good test to make sure it works, but not to test for distortion. You can use a 1.5 V battery, too. Any electrical current will make the cone move. Just don't apply too much voltage, or leave it on there too long.
_________________
'84 Marlen Custom D-10, 8X4
Oahu Tonemaster 6 string lap steel
Rice Custom 6 string lap steel
Republic Squareneck Tricone
Homebrew 6 string reso
10 string Melobar- Rice modified
Rice Custom 8 string reso (under construction)
Hohner 6 string lap guitar (acoustic)
Kustom K-500 tuck & roll
Peavey Century
Peavey Vegas 400
Peavey CS-800
Bag End custom 1X12 & 1X15 cabs w.EV drivers
Steelin' thru a '72 Vibrosonic Reverb and a '69 Dual Showman Reverb (Stereo) |
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Jack Stoner
From:
Kansas City, MO
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Posted 16 Jun 2012 7:55 am
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| If this is a Peavey Black Widow speaker with distortion, you can "clean the gap" (what Peavey calls it) by taking off the magnet and cleaning any crap out of the magnet and back of speaker. This takes care of a lot of distortion problems. |
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