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Topic: Series Speaker Box |
Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 20 May 2013 1:25 pm |
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Ken Metcalf wanted a box to series his 4ohm JBL's so he could run them with an 8ohm BF Single Showman (nice lookin' rig!). I whipped this up for him and thought I'd share it with y'all.
Notice the part about shorting jacks... you can harm your tube amp if you run into an open-circuit for a period of time. You can make the jacks on here shorting if you like... you can still have the problem if your speaker's unplugged, however. Not liable for operator error!
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Too much junk to list... always getting more. |
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Ken Metcalf
From:
San Antonio Texas USA
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Posted 20 May 2013 1:31 pm
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Thanks Steve!
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MSA 12 String E9th/B6th Universal.
Little Walter PF-89.
Bunch of stomp boxes |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 20 May 2013 9:15 pm
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I've thought of a few more notes:
1.) The box will work if you mix up the ports... but the speakers will be out of phase unless you use input/output as specified.
2.) The enclosure must be plastic, or the jacks must be insulated. Don't use a metal box with normal jacks!
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Too much junk to list... always getting more. |
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Bill A. Moore
From:
Silver City, New Mexico, USA
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Posted 21 May 2013 6:55 am
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Stephen, I used a '94 Twin OT, when I built my clone. I drilled a hole for a Marshall 4-8-16 ohm switch, and also added an extra (isolated) jack for the possibility of series connection.
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Eric Dahlhoff
From:
Point Arena, California
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Posted 21 May 2013 8:07 am cautionary tale
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As an extra bit of caution, I suggest using plastic 1/4" plugs on your speaker cables.
I have a series box like this for use on my PA & it got dropped (with metal plugs attached) onto a metal surface which shorted 2 of the plug housings for just a brief but destructive instant.  
You can also cover the plug bodys with shrink tubing or electrical tape.
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"To live outside the law you must be honest." (Bob Dylan) |
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Stephen Cowell
From:
Round Rock, Texas, USA
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Posted 22 May 2013 6:26 am
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Good point, Eric... one of the shields gets to be 'hot' with this rig.
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Too much junk to list... always getting more. |
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Stephen Abruzzo
From:
Philly, PA
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Posted 22 May 2013 7:17 am
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| I, unfortunately, am not knowledgeable about the vast majority of these electrical issues you guys talk about.......and just wanted to say THANKS to all who contribute and explain in such a way that even a NOOB like me can glean some useful information along the way. |
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