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01-04-2013, 11:32 AM
| | Registered User | | Join Date: Jul 2007 Location: Lawrence, Ks | | | Some guy at Carvin just told me...
that wiring two 4 ohm speakers in series would not produce an 8 ohm cab/load.
Am I a moron?
TIA |
01-04-2013, 11:35 AM
|  | Registered User | | Join Date: Sep 2007 Location: Austin, TX | | Quote:
Originally Posted by positivechris  that wiring two 4 ohm speakers in series would not produce an 8 ohm cab/load.
Am I a moron?
TIA | No, you are not. Wiring them in series get you 8, and parallel gets you 2. |
01-04-2013, 11:35 AM
|  | Total Hyper-Elite Member
Independent Contractor to Bass San Diego | | Join Date: May 2000 Location: Groom Lake, NV | | Quote:
Originally Posted by positivechris that wiring two 4 ohm speakers in series would not produce an 8 ohm cab/load.
Am I a moron?
TIA | No. Of course it won't be 8 ohms when measured by a VOM across the terminals.
<edit> OK, maybe Carvin guy not so dumb.
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Last edited by Munjibunga : 01-04-2013 at 04:54 PM.
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01-04-2013, 11:36 AM
| | Registered User | | Join Date: Jan 2002 Location: Silicon Valley, CA, USA | | | Wired in series, any break in the wiring shuts them all down. That's why we usually wire in parallel.
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01-04-2013, 11:39 AM
|  | Registered User | | Join Date: Feb 2005 Location: Greenville, NC USA | | | I am going to guess he misunderstood what you were saying. I have had several conversations with those guys and they have always been at least up to par if not great. Again, it's just a guess, but I think there's some sort of communication gap there.
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01-04-2013, 11:40 AM
|  | in your chest
Endorsing Artist: Dark Horse strings | | Join Date: Oct 2009 Location: Verde Valley, AZ | | Quote:
Originally Posted by chucko58 Wired in series, any break in the wiring shuts them all down. That's why we usually wire in parallel. | That's why we have solder. 
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01-04-2013, 11:42 AM
| | Registered User | | Join Date: Sep 2007 Location: Austin, TX | | Quote:
Originally Posted by two fingers I am going to guess he misunderstood what you were saying. I have had several conversations with those guys and they have always been at least up to par if not great. Again, it's just a guess, but I think there's some sort of communication gap there. | My suspicion is that the other guy was probably thinking about daisy chaining multiple cabs, which does in fact put the speakers in parallel. |
01-04-2013, 11:45 AM
|  | Hip No Ties | | Join Date: Apr 2004 Location: New York, NY | | Quote:
Originally Posted by okcrum That's why we have solder. | That's also why we wire speakers in parallel... 
MM
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01-04-2013, 11:48 AM
| | Registered User | | Join Date: Sep 2007 Location: Austin, TX | | Quote:
Originally Posted by MysticMichael That's also why we wire speakers in parallel...
MM | Quite a few 4x10 and 4x12 cabs are wired in series/parallel configuration from the factory. I'd be more worried about getting struck by lightning.
How often have you seen a speaker cab's wiring fail, or melt a voice coil? Sure wouldn't keep me up at night. |
01-04-2013, 11:48 AM
| | Registered User | | Join Date: Jul 2007 Location: Lawrence, Ks | | | Interesting. Anybody got a link for some reasonably priced 16 ohm 10 inch speakers?
Again, thanks for the help. |
01-04-2013, 11:50 AM
|  | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | Quote:
Originally Posted by chucko58 Wired in series, any break in the wiring shuts them all down. That's why we usually wire in parallel. | Also, because amplifier outputs are primarily voltage sources, the variations in impedance among series-wired loudspeaker drivers will affect the signal that the other driver(s) receive. And vice-versa. |
01-04-2013, 12:20 PM
| | Registered User | | Join Date: Jul 2007 Location: Lawrence, Ks | | Quote:
Originally Posted by Munjibunga No. And neither is he. A little slow, but not a moron. Dimwit maybe. Of course it won't be 8 ohms when measured by a VOM across the terminals. | Explain this, please. If I'm running a series 8ohm and a parallel 8 ohm cab into a 4 ohm amp would this create problems for the amp? |
01-04-2013, 12:24 PM
|  | Come at me, bro! | | Join Date: Jul 2010 Location: Downstate CA | | Quote:
Originally Posted by positivechris Explain this, please. If I'm running a series 8ohm and a parallel 8 ohm cab into a 4 ohm amp would this create problems for the amp? | Measured DC resistance does not equal nominal impedance. |
01-04-2013, 12:25 PM
| | Hip No Ties | | Join Date: Apr 2004 Location: New York, NY | | Quote:
Originally Posted by Bob Lee (QSC) Also, because amplifier outputs are primarily voltage sources, the variations in impedance among series-wired loudspeaker drivers will affect the signal that the other driver(s) receive. And vice-versa. | There! See? 
MM
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01-04-2013, 12:27 PM
| | Registered User | | Join Date: Sep 2007 Location: Austin, TX | | Quote:
Originally Posted by positivechris Explain this, please. If I'm running a series 8ohm and a parallel 8 ohm cab into a 4 ohm amp would this create problems for the amp? | An ohm meter simply measures DC resistance, while the impedance rating of a speaker also includes AC impedance created by the voice coil's inductance.
Basically, a speaker's resistance should always read somewhat lower than its nominal impedance because of this. |
01-04-2013, 12:43 PM
| | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | Quote:
Originally Posted by Handyman An ohm meter simply measures DC resistance, while the impedance rating of a speaker also includes AC impedance created by the voice coil's inductance. | All of the mechanical attributes of the loudspeaker system--moving mass/inertia, spring action of the suspension, air loading and its variations due to the enclosure, driver resonance, etc.--also become part of the impedance. |
01-04-2013, 12:48 PM
| | Registered User | | Join Date: Sep 2007 Location: Austin, TX | | Quote:
Originally Posted by Bob Lee (QSC) All of the mechanical attributes of the loudspeaker system--moving mass/inertia, spring action of the suspension, air loading and its variations due to the enclosure, driver resonance, etc.--also become part of the impedance. | Fair enough. A speaker is a motor, after all. The impedance vs frequency curves certainly don't look much like a plain old inductor. |
01-04-2013, 02:01 PM
| | | Quote:
Originally Posted by Handyman Quite a few 4x10 and 4x12 cabs are wired in series/parallel configuration from the factory. I'd be more worried about getting struck by lightning.
How often have you seen a speaker cab's wiring fail, or melt a voice coil? Sure wouldn't keep me up at night. |
This - in fact, nearly all 410s are wired series/parallel, and it never seems to be a problem for them...
- georgestrings |
01-04-2013, 02:07 PM
| | Total Hyper-Elite Member
Independent Contractor to Bass San Diego | | Join Date: May 2000 Location: Groom Lake, NV | | Quote:
Originally Posted by Handyman My suspicion is that the other guy was probably thinking about daisy chaining multiple cabs, which does in fact put the speakers in parallel. | Probably. If that's the case, you need a special cable to daisy chain two cabs in series. I've made a couple of them. Quote:
Originally Posted by positivechris Explain this, please. If I'm running a series 8ohm and a parallel 8 ohm cab into a 4 ohm amp would this create problems for the amp? | Quote:
Originally Posted by landau roof Measured DC resistance does not equal nominal impedance. | What he said. Usually, an 8-ohm speaker impedance will read somewhere between 5 and 6 ohms on a DC ohmmeter.
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Last edited by Munjibunga : 01-04-2013 at 02:17 PM.
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01-04-2013, 02:25 PM
|  | Registered User | | Join Date: Nov 2008 Location: Lake Havasu City, Az USA | | Quote:
Originally Posted by positivechris Explain this, please. If I'm running a series 8ohm and a parallel 8 ohm cab into a 4 ohm amp would this create problems for the amp? | You need to explain "4 ohm amp". If it is a SS head that says "4 ohm minimum" then two 4 ohm or a 4 ohm and 8 ohm cab in parallel will exceed the minimum load (4 ohm and 4 ohm= 2 ohms, 4 and 8=2.667 ohms). 8 and 8 in parallel = 4 ohm load and you are good, run them in series and the load becomes 16 ohms still fine but less power will be available from the amp. If it is a tube amp you should match the speaker cabs closely to the amps needs if at all possible.
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