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Post by Colchar on Jul 3, 2021 19:47:03 GMT
I recently picked up a used JVM210H and a Marshall 1936 cab. Since I just knew I'd go to a 4x12 at some point, I decided that there was no time like the present and scooped a 1960A that is in great condition for $500 (Canadian). I will be exchanging the 1936 for it later today. I am normally a combo guy and never have to worry about ohms or inputs, so I need some help. My understanding is that I can plug the JVM into the 1960 using either the 16ohm or the 4ohm connection on the amp. Is that correct? If so, does it make any difference which I choose (ie. does the choice affect the sound in some way)? If that isn't correct, which should I use - 16ohm or 4ohm? The cab won't arrive until later in the week so I've got time to learn before I'll have to connect them. In case it helps, here are links to those products on the Marshall webpage: marshall.com/marshall-amps/products/amps/jvm/jvm210hmarshall.com/marshall-amps/products/cabinets/1960a-and-1960bThanks in advance. |
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Post by zontar on Jul 4, 2021 0:12:40 GMT
I always forget how it works, but I know I made sure it matched on the cab I use for my Orange Micro Dark. SO I always look it up if I need the info. But in general if using just one cab you should match the ohms. Where it can get tricky though is series & parallel into multiple speakers. Here's one article I found quickly. I can't vouch for it's accuracy, but there are other sources that agree with it link |
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Post by johnreardon on Jul 4, 2021 8:45:08 GMT
As long as you match the ohms on the amp and cab (with a single cab, then there's no problem. Best advice is to try both settings and see if you notice any difference. Some people on the Marshall forum, say they can hear a difference, others say no. 16ohm v 4 ohm |
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Post by Die Bullen on Jul 4, 2021 13:37:34 GMT
What I see in the spec for mono use is there are 4x16 ohm speakers which generally would yield 4ohms. Call them to verify this.
Do not change the impedance to test for tonal differences! What will happen is the mismatched impedance between the amp and speakers will eventually blow the head. You know know mismatched impedance when the volume is unexpectedly loud or soft.
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Post by johnreardon on Jul 4, 2021 13:57:09 GMT
What I see in the spec for mono use is there are 4x16 ohm speakers which generally would yield 4ohms. Call them to verify this. Do not change the impedance to test for tonal differences! What will happen is the mismatched impedance between the amp and speakers will eventually blow the head. You know know mismatched impedance when the volume is unexpectedly loud or soft. The Marshall cabs have switches on that you can change ohms, depending on whether you are using them in pairs/stereo/mono etc. As long as you match the cab setting to the head setting, then no issue
 o/mono e
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Post by Die Bullen on Jul 4, 2021 14:09:54 GMT
What I see in the spec for mono use is there are 4x16 ohm speakers which generally would yield 4ohms. Call them to verify this. Do not change the impedance to test for tonal differences! What will happen is the mismatched impedance between the amp and speakers will eventually blow the head. You know know mismatched impedance when the volume is unexpectedly loud or soft. The Marshall cabs have switches on that you can change ohms, depending on whether you are using them in pairs/stereo/mono etc. As long as you match the cab setting to the head setting, then no issue
o/mono e
Thanks for posting that. I was looking for a picture of the jacks on the Marshall site (apparently not hard enough)! |
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Post by highdeaf on Jul 4, 2021 17:43:46 GMT
Either will work just fine, assuming you can set both head and cab at either 4 or 16 ohms, with little to no audible difference (at least it is debatable if there is an audible difference).
Technically, the lower impedance connection (4 ohms) will be lower voltage and higher current, so speaker cable becomes a bit more of a factor (0.25 ohms of cable in a 4 ohm circuit has more impact than 0.25 ohms in a 16 ohm circuit). Speaker cables are usually so short between head and cab that that isn't even much of a factor, cable impedance being much less than 0.25 ohms.
Just don't set it wrong because a 4:1 impedance mismatch can be a real concern (hate to say it, especially with Marshalls). Try it both ways and see if you can hear a difference?
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