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Question on ohms
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Requiem View Drop Down
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Points: 531 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Requiem Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 10:55am
Originally posted by knet94 knet94 wrote:

Inside the cabinet if the drivers are wired with both positives wired together (from the amp) and both negatives wired together (going back to the amp) then this is paralell.

If the positive from the amp goes to the positive of one driver and then the negative is connected to the positive of the other driver and then the negative goes back to the amp this is a series. You need to know which one as it's fundamental to calculating ohmage when using multiple drivers.

Hope that helps.


Cheers i didnt know that, that is where i was confusing people, i got parallel confused with series


Originally posted by GEB GEB wrote:

Why is this in the 'advanced' section?

The best and easiest solution would be 4 matching drivers, eg; 8 ohms. Funds permitting of course. But then again, it probably won't be long before the 8 ohm drivers get too much power and blow anyway if they're matched with the 16 ohm drivers, costing you more in the long run!

yeah i assumed the drivers i was getting would be exactly the same as the ones i already had as they were the same driver but apparently not.  ill just run one top at 4 ohms and one at 8

thanks for your help guys


Edited by Requiem - 27 January 2012 at 10:59am

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Points: 1941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 6:48pm
Are these in an MR228?
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Points: 531 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Requiem Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 8:48pm
no they are in a pair of electrotech lab q tops from late 1980's/early 1990's heres a pic

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Points: 1941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 10:20pm
The reason I ask is; dont they have crossovers in? Changing the impedance of the drivers will change the response of the crossovers and screw the cabinet characteristics.


Edited by kedwardsleisure - 27 January 2012 at 10:21pm
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Requiem View Drop Down
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Points: 531 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Requiem Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 10:31pm
nope no crossovers, its biamped- the big horn and the bullets run off one input with the bullets on a 7khz filter and the 2x 12" drivers run off a seperate input

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Points: 1941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 11:18pm
OK but surely they should be the same if you're running them together unless you can address the response difference in an LMS
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Points: 531 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Requiem Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2012 at 10:08am
i have no idea - that was the purpose of this thread.

a driver needed replacing in each top, and the new ones i got were exactly the same but the 8 ohm version whereas the drivers i already had were the 16 ohm version. was trying to find out if i could run one of each in each top or not, but is probably better to run one top at 4 ohms and one at 8 so far as ive been advised

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Personally I would just send the drivers back and get the right ones.

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