extension speaker questions...

A

ACR4V3N

New member
I just bought a bogner alchemist 112 and want to hook up more speakers to it to see what happens. It has two jacks on the back of it that say "4 ohm out. Connect 8 ohm pair OR 4 ohm single." Also, the manual says this about extension speakers;
"Set the amp to standby if no speakers are connected. For instance, if you are using the amp as a preamp or to drive a slave amp, without a speaker or suitable load box connected, you must set the amp to standby. Failure to so may cause extensive damage to the amp and its output transformer. Follow rear panel instructions for connecting other speakers. The 212 extension cab’s speakers are wired for 8 ohm operation."

I have a guitar amp with a 50 watt and 60 watt speakers (the alchemist is only 40 watts) in it which I was thinking about hooking this amp up to. Both the speakers are 8 ohm. Of course I was going to disconnect the speakers from the original amp, but I figure this would be easier than building a cab, and to convert back is much simpler.

My question is, how would I go about trying out hooking those speakers up to see how without running any risk to my amp? I stress without running any risk.

This is my first serious (tube) amp and dont want to mess anything up. I come to seymourduncan for advice.
 
Re: extension speaker questions...

You would have to wire the speakers in parallel to make 4 ohms, then just plug it into the back of the alchemist, I don't see why the "8 ohm pair or 4 ohm single" would be there.

As long as the amp is getting the proper load, or a safe mismatch (amp putting out 8 ohms into a 16 ohm speaker or cab) it should be good!
 
Re: extension speaker questions...

So I wouldnt need to leave the amp in stand by, and it will have 2 more speakers going with it?

Also, how do I wire the speakers in parallel?

Sorry, I know these are noob questions, and I feel like I could figure them out, but I'm taking every precaution to not damage my child.
 
Re: extension speaker questions...

two 8 ohm cabs in parallel are 4 ohms which is why the jacks are labeled that way.

tube amps need to have a load or they can be damaged which is why it says keep the amp on standby when no speakers are attached. im assuming the internal speaker is 8 ohms so you would not want to run the internal speaker and your 4 ohm cabinet at the same time.

do a search for parallel speaker wiring in google and youll find a diagram
 
Re: extension speaker questions...

Yeah, I read up and tried it. I had the 8 ohm in the amp going with the 4 ohm cab. It sounded alright but nothing to write home about. The effect I'm going for is wiring speakers in series, which I dont think is possible in this situation.
 
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