Speaker Wiring Impedance Question - Page 2 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 10th October 2010, 04:17 PM   #11
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Sure looks like a standard series parallel to me. I am confused by the wires on the lower left speaker. Can you straighten those out a bit and confirm they are running the same as the ones on the lower right?
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 10th October 2010, 04:19 PM   #12
wwenze is offline wwenze  Singapore
diyAudio Member
 
Join Date: Mar 2008
What are you measuring the impedance with?
  Reply With Quote
Old 10th October 2010, 07:32 PM   #13
diyAudio Member
 
Join Date: Sep 2010
Cal, the wires on the left are going right to their respective destinations, identical to the ones on the right. I swear I thought for that setup the speakers on the bottom had to be run together instead of the speakers recieving the main input signal, but I guess it doesnt matter. Right? Only reason Im questioning it is because of my odd ohm readings.
wwenze, I am measuring + to - with a digital multimeter across a single speaker. Should I use the multimeter in a different location?
Click the image to open in full size.Click the image to open in full size.
wwenze, I am measuring + to - with a digital multimeter across a single speaker. Should I use the multimeter in a different location?

Last edited by Rotus623; 10th October 2010 at 07:35 PM.
  Reply With Quote
Old 10th October 2010, 08:18 PM   #14
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
The wiring seems correct. You must disconnect the input wires from the amp and measure there. If those are 16 ohm drivers you should read 16 ohms. If you measure at one driver as it stands with disconnecting anything you should read 4 ohms. The diagram you show is the same as what you have as far as the speakers are concerned.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 10th October 2010, 08:56 PM   #15
Davey is offline Davey  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Bremerton, WA.
If you measure on a single driver you'd see 8 ohms not 4 (since there's another driver still in shunt.) IF these drivers really are 16 ohms.

Rotus,

Remember, 16 ohms is probably the rated nominal impedance of these drivers and not the DC resistance, which is what you're measuring with your ohmmeter. Most likely it would measure something less than 16 ohms.

Also, maybe I missed it, but you MUST disconnect the red/black wires from your amplifier while making these measurements or you will get an incorrect reading.

Cheers,

Dave.

Last edited by Davey; 10th October 2010 at 09:02 PM.
  Reply With Quote
Old 10th October 2010, 09:24 PM   #16
diyAudio Member
 
Join Date: Sep 2010
Okay Cal, Davey, you want me to measure the ohms at the input jack of the speaker cab, or the output of the amplifier? When I measured at the (disconnected) speaker input jack, I get all sorts of crazy numbers. When I measure directly across each speaker, it is 4 ohms.
Conclusion is that the multimeter which measures DC Impedance is not going to properly measure this, correct? And also, this is in fact a series-parallel, so I should be at 16 ohms and just set my amp output impedance to that, right?
  Reply With Quote
Old 10th October 2010, 10:10 PM   #17
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Quote:
Originally Posted by Davey View Post
If you measure on a single driver you'd see 8
Yes of course, my little brain hiccup had me thinking 8 ohm drivers. Must pay attention.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 2nd December 2010, 08:39 AM   #18
diyAudio Member
 
Peckerwood's Avatar
 
Join Date: Oct 2010
Location: Texas
Run it at 16 ohms. If you put a meter on the input jack to the cabinet and it says somewhere around 12 to 14 ohms then it is a 16 ohm cabinet. There is not any way to get 8 ohms from 4 16 ohm speakers.

But if you disconnect the speakers and put a meter on them each one should read in the area of 12 to 14 or so ohms.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Speaker Impedance Variation-A question Gandalph Solid State 3 3rd January 2010 05:25 PM
Subwoofer speaker selector impedance question haddo Subwoofers 4 3rd November 2009 04:27 PM
4x12 Speaker cab wiring question mytool4u Instruments and Amps 28 8th August 2007 10:15 PM
Speaker impedance question theskintman Multi-Way 6 12th May 2007 06:14 PM
a simple question about speaker Impedance?? Minion Full Range 8 23rd October 2006 06:08 PM


New To Site? Need Help?

All times are GMT. The time now is 11:14 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2