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post #1 of 7 (permalink) Old 06-15-2003, 04:19 PM Thread Starter
Join Date: Apr 2001
Posts: 211
Stupid question (asap please)

Ok I may sound REALLY stupid here but I need some help.

I have a marshall JCM2000 DSL100 and a JCM900 Cab (1960A)

the back has (2) 8 ohm outs and one 16ohm out. Which do i use? I lost the instruction manual and Im playing my first gig tomorrow and dont want to screw anything up
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post #2 of 7 (permalink) Old 06-15-2003, 06:40 PM
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Location: Mannheim, Germany
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I'm not an expert, but I think it means, that you can plug 2 cabs with an impedance (sp?) at 8 Ohms each or 2 8 ohms cabs that are connected to each other in a row, which would make the impedance of these two cabs 16 Ohms, if I remember correctly. Can anyone else help this guy out? I'm not too sure...

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post #3 of 7 (permalink) Old 06-15-2003, 08:45 PM
Join Date: Aug 2002
Location: TAS, Australia
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with the dsl100 you can have 2 cabs in stereo on 8 ohms each
or 1 cab at 16 ohms
or 1 cab at 4 ohms

i think 4 ohms is louder than 16 ohms

just remember to have the right output to input

the back has two 8 or 4 ohm outputs(use the switch to choose)
and a 16 ohm output

the cab has a 16 ohm input(which is also the 8 ohm right input)
and a 4 ohm input (also 8 ohm left)
the cab has a switch for mono or stereo
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post #4 of 7 (permalink) Old 06-16-2003, 02:28 AM
Join Date: Jun 2001
Location: Stockholm SWEDEN
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Originally Posted by the third eye
with the dsl100 you can have 2 cabs in stereo on 8 ohms each
There's only one power section so no matter how many cabs you connect you will still have mono only.
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post #5 of 7 (permalink) Old 06-16-2003, 03:04 AM
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yeah you're right

but if you're using 2 cabs you still have to switch it to stereo on the 1960
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post #6 of 7 (permalink) Old 06-18-2003, 12:31 PM
Join Date: Dec 2000
Location: Bellport Village - LI, NY
Posts: 659
You don't have to switch it to stereo. That switch splits the amp into two independent pairs of speakers. Think of it as two conjoined 2x12 hm cabs.

When using a JCM2000-series head with two JCM1960-series cabinets (the standard 300w capacity versions), your option is really to switch the amp to hms and run the amps speaker outs (the ones used for 8 or 4 ohms-the middle and right) each to the 16Ohm input of the cabs and the cabs should be seitched to mono.

The JCM1960 cabs are either 4 or 16 Ohm when switched to mono. Depending on how you are running the head will determine which jack on the back of the cab to use as each jack is labled. Switching to stereo splites each side to an hm resistance. Your stereo choices are:

1. two separate heads with an hm output
2. a stereo-output amp or power amp that runs hms per side
3. switching a mono amp with two speaker outs to the 4Ohm mode and running a speaker cable to each input jack of the amp. (this is just a waste of a speaker cable and isn't stereo if the amp isn't stereo. this would give you the same result as switching the cab to mono and using one cable into the 4Ohm jack.)

Mike 777 Haug
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post #7 of 7 (permalink) Old 06-19-2003, 02:22 AM
Join Date: Aug 2002
Location: TAS, Australia
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yeah that's right i forgot to say you can run things through a higher impedence(8ohms out to 16 in)
Ki swordsman is offline  

ohm cab , ohm output , power amp , speaker cab

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