8 ohm 212 Gallien Krueger Neo cab rewrire question
I have a 212 Gallien Krueger cabinet that is 8ohms. I was wondering if it were possible to rewire it to 4ohms.
I use the cabinet with either a GK 400rb (80s model) or a 90s GK 800rb head. I'd like to have the cabinet at 4ohms to have more power with just a single cab rather than add a second or try a different head.
Not with out replacing the drivers.
My 2 cents worth - It's not worth the trouble. The difference in volume between 8 and 4 ohms is almost indiscernible. If you want 4 ohms add another 8 ohm cabinet to your bass rig. Otherwise, I wouldn't mess with it.
When I use my 400rb or 800rb heads with my Ampeg 410hlf it's way louder. I bought the GK 212 neo (40lbs) in hopes of leaving my Ampeg (91lbs) at home.
I have back problems and that is why I wanted to use a weight friendly cabinet. I'd rather not add a second neo because
the weight with two cabs would be the same as just taking the Ampeg. Plus two cabs is a bigger load to carry in the car than one.
As already stated - it is impossible to rewire your cab for 4 ohms. Only way is to replace the speakers.
And.............even if you did replace the speakers, the difference between the 8 ohm and 4 ohm versions of the same cab are almost undetectable.
I do have extra power amps. Is it possible to use either of the GK heads to drive a power amp so I can get more from the cabinet?
Yes use the "effects send" to go to a power amp.
You have less speaker displacement with a 212 over a 410 but I wonder if you are comparing the sound up close or out front? Get the cab off the floor or tilt it back so all the sound is not playing to your ankles?
It is impossible to change a cabinet from 8 ohms to 4 ohms by just rewiring it. You'd need new drivers.
The difference from 8 ohms to 4 ohms would be just shy of 3 dB, which *is clearly noticeable* - but not that much. About the same volume increase, roughly, from rolling your Master output volume up one notch usually.
I really dislike the completely false meme that is perpetuated on TB that a 3 dB difference is "imperceptible" or "barely perceptible" or "almost undetectable". I will tell you it easily detectable, no one would ever miss it. It is nevertheless not a great increase in volume- but to characterize it as barely perceptible is simply inaccurate. The minimum perceptible volume difference is 1 dB, sensibly enough.
You doubt me? I've posted this link many times, and no one ever seems to check it out. BassPounder, go check this link, listen to the audio clips that compare white noise at different attenuation levels from 3 dB, 1 dB (the JND - just noticeable difference level), and 0.3 dB, to and come back and tell me if 3 dB is "almost undetectable":
Not all amps double their output (in this case he would be going from 150w to 240w), and not all speakers can efficiently make use of that extra power - therefore there is NO +3db gain.
You show me a true 3db gain, then I'll worry about your feelings.
I had a chance to use my GK Neo 212 and GK 800 rb head in a different venue last night. I heard everything fine and it was more than loud enough. Sound man even told me to turn down my stage volume. So it must have been the venue / pa I used it at last that I couldn't hear not my head and amp.
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