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Topic: Piggybacking Speakers |
George Rozak
From:
Braidwood, Illinois USA
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Posted 4 Jun 2005 7:57 pm |
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| Is there any kind of a wiring standard for the dual 1/4" connectors found on the back of most speaker cabs when adding another speaker to the chain? In other words, one 8 ohm speaker in the chain would obviously put an 8 ohm load on the power amp. If a second 8 ohm speaker was added to the chain via the 2nd 1/4" connector, would the speakers be wired in series for total load of 16 ohms on the amp, or would the speakers be wired in parallel, for a total load of 4 ohms on the amp? |
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Scott Appleton
From:
Ashland, Oregon
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Posted 4 Jun 2005 8:32 pm
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It depends on how you wire the jack to start with.
If you are talking about two jacks in parallel on the same speaker cabinet and then plugging in another cabinet with an 8 ohm speaker then you would have a parallel load of aproximately 3.6 ohms although that can vary.
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Mullen S12 Almost Mooney
71 Tele, Regal 45
Sho Bud S10 NP
Line 6 Flextone 3 + JBL D130, Acoustic 100 W all tube, Nash 112
digitech 2101 FX |
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Earnest Bovine
From:
Los Angeles CA USA
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Posted 4 Jun 2005 8:37 pm
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| If there are 2 jacks, they are connected in parallel. Otherwise they wouldn't work when you plug in just one. (OK, it could be done with some kind of switch on the connector, but I've never seen 2 speaker jacks connected in series.) |
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George Rozak
From:
Braidwood, Illinois USA
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Posted 4 Jun 2005 8:57 pm
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Thanks Scott & Earnest. I kind of figured that they had to be wired in parallel, but wasn't quite sure.
George
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Sho-Bud: Professional & Fingertip
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Tony Palmer
From:
St Augustine,FL
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Posted 12 Jun 2005 5:01 pm
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| I hate the two jacks becasue I always think I might have sounded better if I plugged into the other one......! Too many choices! |
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Bob Tuttle
From:
Republic, MO 65738
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Posted 12 Jun 2005 8:05 pm
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| Two speakers of equal value, in parallel, gives you a total load of half the value of one individual speaker. In other words, two 8 ohm speakers in parallel equals 4 ohms. |
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Scott Appleton
From:
Ashland, Oregon
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Posted 15 Jun 2005 11:48 pm
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Bob T, You would think that is so from the ohms law
but it is a different story when you actually measure
a pair of speakers hooked up in Parallel. You have to add in the impeadance to the equation to get an avarage reading. I find that this figure will vary.
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Mullen S12 Almost Mooney
71 Tele, Regal 45
Sho Bud S10 NP
Line 6 Flextone 3 + JBL D130, Acoustic 100 W all tube, Nash 112
digitech 2101 FX |
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Dave Grafe
From:
Hudson River Valley NY
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Posted 16 Jun 2005 2:05 am
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What Scott said, not to mention that we are actually only talking "nominal" impedance, as the measured impedance changes with frequency.
In fact, two different speaker designs (say a JBL and a BW or a 15" and a 12" from the same manufacturer) will have impedances that change differently as the frequency changes. |
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Mike Brown
From:
Meridian, Mississippi USA
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Posted 16 Jun 2005 5:25 am
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| Also, do not mistake the measurement of DC resistance as impedance. |
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Jim Peters
From:
St. Louis, Missouri, USA, R.I.P.
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Posted 16 Jun 2005 7:02 am
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| Don't forget that a lot of PA cabinets have internal crossovers, so both jacks are not created equal. I have a pair of Carvins that are parallel,PV SP2's,Parallel,PV Internationals,NOT parallel,EVS100,,not parallel. It will(usually) say on the input panel how they are wired. |
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