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Post by Hohn on Dec 15, 2006 9:51:07 GMT -7
I saw a "safe speaker hookup guide" published by another amp maker showing a setup using the following connection:
8 Ohm tap-- 16 Ohm cab 4 Ohm tap-- 8 Ohm cab
Running two cabs of different impedance at the same time would be a nice option, but I'm not sure it's safe.
The logic seems reasonable enough (half the impedance with two cabs, etc), but does this hold water?
Do Z amps have a particular limitation that would prevent this, or do all amps have this? If so, why would this well-know amp company publish something saying this is OK to do?
Justin
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Post by benttop (Steve) on Dec 15, 2006 11:18:41 GMT -7
I'm not sure what the other amp was, but on the Z amps all three outputs are wired to different taps on the transformer, so you don't want to use more than one at a time. If you want to hook up two cabs, you need either a Y cord or one of your cabs needs an extension jack on it. As to different impedances, you can do that but you need to be aware of a couple of things. First, you must still observe safe impedance matching with the jack that you are about to plug into. If you know how to calculate the impedance of the two cabs together, you can usually figure out which jack to plug into. If you don't know how to figure it, post here and one of us will tell you what the impedance is. Second, when you use dissimilar impedances, you're going to have more power developed in one cab vs the other. It is not a major difference, usually, but noticiable. Most guys who do it end up looking for same-impedance cabs so they don't have this to contend with, but YMMV - everyone tolerates different things. I wouldn't like it for me, but I'm not you. As to why this other amp manufacturer said whatever - many amps have two jacks on the back that are wired in parallel, like an extension speaker jack. Plugging two cabs in there is fine, as long as you observe the safe minimum impedance of the amp. Z amps are NOT wired like that. Use one jack at a time - never more than one. It appears that the manufacturer you're talking about is saying to use two different taps at a time - I'm not sure that's a good idea or a bad idea. Suffice it to say that's not the recommended way to use the amp.
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Post by billyguitar on Dec 15, 2006 12:27:38 GMT -7
Perfect explanation.
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Post by DRZ on Dec 15, 2006 14:53:13 GMT -7
Perfect explanation Steve.
+1 Karma , oh yeah no more Karma, I sure miss it.........
DR.Z
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Post by Hohn on Dec 15, 2006 17:23:01 GMT -7
Muchas Gracias!!
jh
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Post by Shannon on Dec 19, 2006 14:14:11 GMT -7
Perfect explanation Steve. +1 Karma , oh yeah no more Karma, I sure miss it......... DR.Z Any way we can let Doc keep his Karma? I don't mind giving mine up, but I ain't never done no good for nobody like Doc has.
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Post by Hohn on Dec 21, 2006 18:48:10 GMT -7
I'm not sure what the other amp was, but on the Z amps all three outputs are wired to different taps on the transformer, so you don't want to use more than one at a time. If you want to hook up two cabs, you need either a Y cord or one of your cabs needs an extension jack on it. As to different impedances, you can do that but you need to be aware of a couple of things. First, you must still observe safe impedance matching with the jack that you are about to plug into. If you know how to calculate the impedance of the two cabs together, you can usually figure out which jack to plug into. If you don't know how to figure it, post here and one of us will tell you what the impedance is. Second, when you use dissimilar impedances, you're going to have more power developed in one cab vs the other. It is not a major difference, usually, but noticiable. Most guys who do it end up looking for same-impedance cabs so they don't have this to contend with, but YMMV - everyone tolerates different things. I wouldn't like it for me, but I'm not you. As to why this other amp manufacturer said whatever - many amps have two jacks on the back that are wired in parallel, like an extension speaker jack. Plugging two cabs in there is fine, as long as you observe the safe minimum impedance of the amp. Z amps are NOT wired like that. Use one jack at a time - never more than one. It appears that the manufacturer you're talking about is saying to use two different taps at a time - I'm not sure that's a good idea or a bad idea. Suffice it to say that's not the recommended way to use the amp. This "other brand"amp started with M and rhymed with "_esa Boogie". This was in reference to a rackmount power amp, not a combo-- so maybe the output jacks on rackmount power amps aren't wired to different points on the output trans? hmmm
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Post by T-R☼CK ♫ on Dec 21, 2006 23:50:51 GMT -7
I saw a "safe speaker hookup guide" published by another amp maker showing a setup using the following connection: 8 Ohm tap-- 16 Ohm cab 4 Ohm tap-- 8 Ohm cab Running two cabs of different impedance at the same time would be a nice option, but I'm not sure it's safe. The logic seems reasonable enough (half the impedance with two cabs, etc), but does this hold water? Do Z amps have a particular limitation that would prevent this, or do all amps have this? If so, why would this well-know amp company publish something saying this is OK to do? Justin WOW........I just logged on to ask this very same question.....Shudda known I wouldn't be alone here...Thx for "splainin'" BT........ ;D
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