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Here's that question again - Adding a second cab to a combo

stringthrough

stringthrough

Supporting Member
Nov 26, 2011
3,029
5,491
The great state of New York
#1
I'm playing a large outdoor venue tonight and will be adding a second cab to my Markbass CMD 121P combo. Please confirm that I've got the concept right. What follows is my personal notes and image of the connection and setting. Thanks in advance.

When adding the Hartke HyDrive 112 cab to the Markbass CMD 121P combo (with its internal 8 Ohm speaker) make sure the Hartke is set to run at 8 Ohms. 8 Ohms + 8 Ohms nets a combined 4 Ohms, which ups the Markbass’ power from 300W to 500W.

MarkBassComboAndExtCab.jpg
 
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#3
I would vote yes as well, but I have no idea how those switches for 4 or 8 ohms work and if they can interfere with the parallel connection. I would think it's not a problem, but it would be nice to hear from someone who has paired a switchable cab with a regular cab to know for sure.
 
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#4
You are correct.
MAKE SURE THE SWITCH IS ON 8 OHMS BEFORE PLUGGING IN.
THEN CHECK THAT IT IS STILL AT 8 OHMS AFTER PLUGGING IN.
IF THE SWITCH GETS BUMPED TO 4 OHMS YOU CAN FRY YOUR AMP SO TRIPLE CHECK IT IS AT 8 OHMS.
Put a piece of tape on the switch to hold it to the 8 ohm side.

These switches always seem as a neat feature to suck out all the watts until it gets switched at the wrong time then amp is dead. :(
 
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#6
S-Bigbottom said:
You are correct.
MAKE SURE THE SWITCH IS ON 8 OHMS BEFORE PLUGGING IN.
THEN CHECK THAT IT IS STILL AT 8 OHMS AFTER PLUGGING IN.
IF THE SWITCH GETS BUMPED TO 4 OHMS YOU CAN FRY YOUR AMP SO TRIPLE CHECK IT IS AT 8 OHMS.
Put a piece of tape on the switch to hold it to the 8 ohm side.

These switches always seem as a neat feature to suck out all the watts until it gets switched at the wrong time then amp is dead. :(
Click to expand...
Duct tape it!
 
#7
S-Bigbottom said:
You are correct.
MAKE SURE THE SWITCH IS ON 8 OHMS BEFORE PLUGGING IN.
THEN CHECK THAT IT IS STILL AT 8 OHMS AFTER PLUGGING IN.
IF THE SWITCH GETS BUMPED TO 4 OHMS YOU CAN FRY YOUR AMP SO TRIPLE CHECK IT IS AT 8 OHMS.
Put a piece of tape on the switch to hold it to the 8 ohm side.

These switches always seem as a neat feature to suck out all the watts until it gets switched at the wrong time then amp is dead. :(
Click to expand...
Also make sure the cab is set on 8 ohms.
 
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