|
Post by tjstrat on Jul 27, 2007 22:41:04 GMT -7
I have a Mesa 2x12 with two 1/4" jacks on the back, one labelled as in and the other for parallel out. The parallel out does not, however, send a signal when daisychained to another cabinet. When the amp head is plugged into this parallel out jack, the cab again works fine. I am thinking that the speakers are somehoe wired seperately to each jack. Can someone direct me to a diagram showing how a parallel wired 2x12 should look with the second jack wired to output to a second cabinet?
Thanks, anyone....
|
|
|
Post by dixiechicken on Jul 28, 2007 3:52:06 GMT -7
Parallell wiring simply means that the +terminals are wired together and the -terminals are wired together. On your guitarcord it would be the tips are wired together and the sleeves are wired together. Two 8-ohm Cabs/Speakers wired together in parallel will be seen as a 4 ohm load from the amplifiiers point of view. One 8-ohm Cab + one 16-ohm cab wired together in parallell - will be a 5.3-ohm load. Check this link out from Wikipedia - all you ever wanted to know: en.wikipedia.org/wiki/Series_and_parallel_circuitsSpeakers are for all practical purposes the same as inductors. Cheers: Dixiechicken
|
|
|
Post by benttop (Steve) on Jul 28, 2007 8:51:26 GMT -7
I have a Mesa 2x12 with two 1/4" jacks on the back, one labelled as in and the other for parallel out. The parallel out does not, however, send a signal when daisychained to another cabinet. When the amp head is plugged into this parallel out jack, the cab again works fine. I am thinking that the speakers are somehoe wired seperately to each jack. Can someone direct me to a diagram showing how a parallel wired 2x12 should look with the second jack wired to output to a second cabinet? Thanks, anyone.... It sounds like there may be some switching wired in on one or both of those jacks - I wonder if someone has tried to alter their function for you. As dixiechicken says, if both jacks are wired in parallel, you should get exactly what you want. But since you're not getting anything on the second jack when you plug into the first, it sounds like maybe the cab is wired stereo. Are you certain that both speakers are working when you plug into the first jack?
|
|
|
Post by tjstrat on Jul 28, 2007 11:39:16 GMT -7
No, I just checked this and the Blue Dog only works for the input jack, the Silver Bell only for parallel out. What I'll do is open her up, check how it's all wired and get the proper parralel configuration set up. Probably just swapping a few tabs here and there...
|
|
|
Post by tjstrat on Jul 28, 2007 12:22:27 GMT -7
No, I just checked this and the Blue Dog only works for the input jack, the Silver Bell only for parallel out. What I'll do is open her up, check how it's all wired and get the proper parralel configuration set up. Probably just swapping a few tabs here and there...
|
|
|
Post by tjstrat on Jul 28, 2007 16:30:00 GMT -7
I opened her up... and d'oh, the wiring was for one of each speaker input to its own seperate speaker. Prior owner must have run those Celestion 90 watters in stereo. I found some stranded 12 gauge wire, twisted on some handy Ideal Term a Nuts (thanks to customer service samples I'd brought home from some training) and jumpered each speaker neg to neg and pos to pos, and it worked like a charm.
Only question now... Is 12 awg stranded too hefty for the job?
|
|
|
Post by benttop (Steve) on Jul 29, 2007 10:04:14 GMT -7
12 AWG is fine if you can get it in there. Usually that gauge is too big to fit the terminals, but if you already have it in there, you're gold.
|
|
|
Post by dongiesen on Aug 2, 2007 21:45:40 GMT -7
tj: Food for thought. If you sometimes wanted to do the single peaker thing as it's wired presently but also want to have the versatility of the 2 together you could have PCNS make you up a Y with 2 males and a female wired in parallel. Just a thought so you wouldn't have to take it apart each time in the event you even want that versatility
|
|
|
Post by Strato on Aug 5, 2007 13:10:52 GMT -7
I need some help with wiring as well. I have a friend that just ordered a lopoline cab with a switchcraft jack(i believe...) with three connectors on it. How do I know which is positive and negative, and which one to ignore?
|
|
|
Post by benttop (Steve) on Aug 5, 2007 21:35:39 GMT -7
I need some help with wiring as well. I have a friend that just ordered a lopoline cab with a switchcraft jack(i believe...) with three connectors on it. How do I know which is positive and negative, and which one to ignore? On Switchcraft jacks you can usually look at it from the side and see which lugs are connected to the tip and to ground. Those would be the two you would be interested in.
|
|
|
Post by Ridgeback on Aug 6, 2007 7:42:57 GMT -7
I have two Lopo cabs. The third terminal on those jacks is a shunt. If you look closely, you can tell which terminal is connected to the flange which bypasses the connections. Not much use in a 1x12 configuration but in a 2x12 cab it can be used to bypass one of the two speakers using a "dummy" plug in the correct jack. Both of my Lopos are 1x12's so I have never made use of the shunt terminal.
|
|
|
Post by Strato on Aug 6, 2007 11:17:03 GMT -7
Ok now about polarity, is the tip positive, or does it even matter in a 1x12 situation?
|
|
|
Post by benttop (Steve) on Aug 6, 2007 12:40:44 GMT -7
Ok now about polarity, is the tip positive, or does it even matter in a 1x12 situation? Doesn't really matter, but the convention is the tip should be + You follow convention so the next guy down the line already understands what he'll find there, and so that you don't accidentally do it up wrong in a situation where it does matter.
|
|
|
Post by bender72 on Aug 8, 2007 9:17:21 GMT -7
It should look like this, Tip to Tip and sleeve to sleeve.
|
|