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testing maggies with a multimeter help

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Posted on February 28, 2017 at 18:47:41
chertok22@gmail.com
Audiophile

Posts: 59
Location: texas
Joined: January 6, 2014



anybody able or willing to walk me through some basic tests on my maggie's?

i am trying to teach myself to learn low voltage on a motorcycle i have been working on but doing some basic tests (and asking questions) on something like my maggies would be a big help.

found the basic electrical diagram on the MUG site and am posting a couple pics of my new maggies' electrical

 

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RE: testing maggies with a multimeter help, posted on February 28, 2017 at 18:50:24
chertok22@gmail.com
Audiophile

Posts: 59
Location: texas
Joined: January 6, 2014



be cool to learn something about speakers too....

 

RE: testing maggies with a multimeter help, posted on February 28, 2017 at 18:50:53
chertok22@gmail.com
Audiophile

Posts: 59
Location: texas
Joined: January 6, 2014



3

 

RE: testing maggies with a multimeter help, posted on February 28, 2017 at 18:51:21
chertok22@gmail.com
Audiophile

Posts: 59
Location: texas
Joined: January 6, 2014



4

 

RE: testing maggies with a multimeter help, posted on February 28, 2017 at 18:51:43
chertok22@gmail.com
Audiophile

Posts: 59
Location: texas
Joined: January 6, 2014



5

 

RE: testing maggies with a multimeter help, posted on February 28, 2017 at 20:08:34
Satie
Audiophile

Posts: 5426
Joined: July 6, 2002
 Without unhooking the wires,the only real measurements to do are the woofer wires/coil. Just measure those and you should get a reading of about 4 ohms.

The way the other components are connected the coil's resistance - being the lowest resistance path between any of the terminals would be what you read, probably significantly less than one ohm.

 

RE: testing maggies with a multimeter ..., posted on February 28, 2017 at 20:54:30
andyr
Manufacturer

Posts: 12548
Location: Melbourne
Joined: September 2, 2000
 be aware when you are using a multimeter set to its lowest resistance scale - to measure the resistance of the bass panel:

* the leads themselves have a certain resistance so, say, if the actual bass panel resistance is 4 ohms ... the meter might read 4.7 ohms. You measure the resistance of the leads by connecting the 2 leads together and seeing what the meter reads - then you subtract this number off all future readings.

* your typical multimeter is not very accurate at low resistances. You really need to get hold of an auxiliary device which is used in conjunction with a digital multimeter, to get it to give accurate measurements of low resistances.

I bought the following kit (here in Australia):
http://www.altronics.com.au/p/k2531-ultra-low-milliohm-dmm-adaptor-kit/



Regards,
Andy

 

RE: testing maggies with a multimeter ..., posted on March 1, 2017 at 03:25:35
jubal62
Audiophile

Posts: 93
Joined: December 9, 2012
 Magnepan rates SMGAs as 5 OHM.

 

RE: testing maggies with a multimeter help, posted on March 1, 2017 at 05:39:34
neolith
Audiophile

Posts: 4842
Location: Virginia
Joined: February 21, 2002
Contributor
  Since: December 2, 2004
 Without desoldering the tweeter from the circuit, you will not get the correct value because it lies parallel to the inductor and resistor. However if you remove the fuse and measure across the tweeter, you will get a value of somewhat over 3 ohms. If the tweeter was bad the value would be north of 15 ohms. Measuring across the woofer will give you the correct value. As Andy mentioned you will have to subtract the inherent resistance of the meter and leads. Older analog meters had a pot to zero the meter.



"Our head is round in order to allow our thoughts to change direction." Francis Picabia

 

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