Mark V90 1x12 Combo and cabinet help

bandit2013 said:

If you just want to use the 412 by itself and not the combo speaker, just unplug the combo speaker from the back. Then you will need a speaker cable from the amp to the cab. Use the 8 ohm jack on the back of the amp, then route the speaker cable to the 8 ohm jack on the 412 cab. It is that simple. It would be the all silver one just below the C2-76935 number.

If you want to use the combo speaker and the 412 cab at the same time, plug the combo speaker into the bottom 4 ohm jack and the speaker cable into the top 4 ohm jack. Leave the speaker cable in the 8 ohm jack on the back of the cabinet.

Note that the two 4 ohm jacks on the back of the speaker cab is only for use as a stereo combination, meaning, you can run two amps into this cabinet as the four speakers are wired in parallel/series. Two speakers connected in parallel for the 4 ohms, and then in series to complete the 8 ohms. When nothing is plugged into the 8 ohm jack, there is a mechanical switch inside the jack that will open the series connection between the pair of speakers in parallel.

Sure, you can use the cab with the 4 ohm circuit, only one jack should be used and plug that into the 4 ohm jack on the back of the amp. Do not have any other speakers or cables plugged into the other 4 ohm jack on the amp. If you did something like connecting two speaker cables from the two 4 ohm jacks on the amp to each 4 ohm jack on the cabinet, you will burn up your amp as that will result in a total impedance load of 2 ohms as seen by the amplifier. DO NOT DO THAT. Not yelling. Just emphasizing that would be a bad thing.

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