copperandstars
New member
Hello,
I am quite confused about speaker/head impedence issues. I know that if you combine say two 8 ohm cabs the load becomes 4 ohms and whatnot...but here is my situation:
I own a Marshall AVT150H head. I have a Crate BV412SV cabinet, and a Carvin cab. The Crate has options to do 16 ohm mono, 8 ohm stereo, or 4 ohm mono and it has an output to go to another cab. I just got the Carvin cab, which is 8 ohms only, and I have never tried using the Marshall head with both heads until today. Here's what happened: after about 5 minutes the head shut off and smoke came out like crazy. The head does not turn on any more. Bummer! 12 days until my band tours the country and my head dies...
I am not sure what I did wrong. The Marshall head has two speaker outputs, one for using just one 4 ohm cab (the minimum impedence the head handles) and another for an 8 ohm cab. You can also plug an 8 ohm cab into each of the inputs so the load is 4 ohms total. Well here is how I had it set up, which was obviously wrong: I had the crate cab plugged into the 4 ohm jack. The Crate cab was set on 4 ohm mono mode. Then I ran a cable from the output of the Crate cab into the Carvin cab (which is 8 ohms). What did I do wrong here to cause my amp to die? Should I have used the 16 ohm mono on the Crate? And what do you think happened to my head...easily fixable or bye bye Marshall?
Ok...next issue. Now I think I will have to use the Carvin X100B head I just got on our tour. It has three choices for impedence on the back...4 ohm, 8 ohm, and 16 ohm. I am not sure of which to use. The Carvin is an 8 ohm cab, but the Crate cab is different. It is only 8 ohms stereo and I am not using it as a stereo cab. The mono choices are 16 ohm and 4 ohm. Which combo should I use on everything to make it work? I am pretty sure I will have to use the 16 ohm mono setting on the Crate cab, but then I am not of what to set the heads impedence too, because I don't think 16 ohms (Crate cab) plus 8 ohms (Carvin cab) add up to 4, 8, or 16 ohms.
I really appreciate your help on this issue. I know it may take a minute or two to explain but it will really help me out. Thanks!
Ryan
I am quite confused about speaker/head impedence issues. I know that if you combine say two 8 ohm cabs the load becomes 4 ohms and whatnot...but here is my situation:
I own a Marshall AVT150H head. I have a Crate BV412SV cabinet, and a Carvin cab. The Crate has options to do 16 ohm mono, 8 ohm stereo, or 4 ohm mono and it has an output to go to another cab. I just got the Carvin cab, which is 8 ohms only, and I have never tried using the Marshall head with both heads until today. Here's what happened: after about 5 minutes the head shut off and smoke came out like crazy. The head does not turn on any more. Bummer! 12 days until my band tours the country and my head dies...
I am not sure what I did wrong. The Marshall head has two speaker outputs, one for using just one 4 ohm cab (the minimum impedence the head handles) and another for an 8 ohm cab. You can also plug an 8 ohm cab into each of the inputs so the load is 4 ohms total. Well here is how I had it set up, which was obviously wrong: I had the crate cab plugged into the 4 ohm jack. The Crate cab was set on 4 ohm mono mode. Then I ran a cable from the output of the Crate cab into the Carvin cab (which is 8 ohms). What did I do wrong here to cause my amp to die? Should I have used the 16 ohm mono on the Crate? And what do you think happened to my head...easily fixable or bye bye Marshall?
Ok...next issue. Now I think I will have to use the Carvin X100B head I just got on our tour. It has three choices for impedence on the back...4 ohm, 8 ohm, and 16 ohm. I am not sure of which to use. The Carvin is an 8 ohm cab, but the Crate cab is different. It is only 8 ohms stereo and I am not using it as a stereo cab. The mono choices are 16 ohm and 4 ohm. Which combo should I use on everything to make it work? I am pretty sure I will have to use the 16 ohm mono setting on the Crate cab, but then I am not of what to set the heads impedence too, because I don't think 16 ohms (Crate cab) plus 8 ohms (Carvin cab) add up to 4, 8, or 16 ohms.
I really appreciate your help on this issue. I know it may take a minute or two to explain but it will really help me out. Thanks!
Ryan