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GK700rb ohm question

etaym

etaym

Gold Supporting Member
Mar 28, 2005
636
815
Newton, MA
#1
Hi. i own a GK 700rb amp and a 2x10 eden 4ohm cab. i would like to add an 8ohm 1x15 but i understand this would be a problem.

someone told me i can connect the 2x10 to the amp and somehow connect the 1x15 to the 2x10. i would like to hear your opinion since i have no knowledge when it comes to electronics.

from my basic basic basic understanding: the amp is 4ohms. i want to connect 4 an 8. the amp will not appreciate this :hmm:
 
#2
You are correct for the most part here. The lowest your amp will go before damaging itself and/or the speaker is 4 ohms. You're best bet if you wanted to use two cabs, is to have two 8 ohm cabs connected directly to the outputs of the amp (in parallel), it would result in a 4 ohm load. As I was corrected by tornadobass, "Whether you plug both cabs into the amp or daisy chain cabs, it's still parallel wiring and results in an impedance below 4 ohms". If you connect both cabs directly to the back of your amp (in parallel), it would result in a 2.66 ohm load, which is not good for your amp. Here is a couple of links to read that easily explain what you are going through:

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#3
thanks!! one question then - if i connect the 8ohm to the 4ohm you say the result will be 12ohm and will not take advantage of my amp. The what WILL happen? will i get a weaker output then just the 4ohm? will i lose lower/higher frequancies?
 
#4
xgabriel said:
If you were to plug the 4 ohm cab directly from the amp, and then plug the 8 ohm cab directly from the 4 ohm cab(as in series), it would result in a 12 ohm load, which really wouldn't be taking advantage of the power of your amp, resulting in a lower audible volume.
Click to expand...

Nope...this isn't correct. Whether you plug both cabs into the amp or daisy chain cabs, it's still parallel wiring and results in an impedance below 4 ohms.

To get series wiring, you need to either get a special cable or make up an outboard box that accomplishes series wiring.

But then you'd still have unequal power to the two cabs, with the 4 ohm drawing more.
 
#5
tornadobass said:
Nope...this isn't correct. Whether you plug both cabs into the amp or daisy chain cabs, it's still parallel wiring and results in an impedance below 4 ohms.

To get series wiring, you need to either get a special cable or make up an outboard box that accomplishes series wiring.

But then you'd still have unequal power to the two cabs, with the 4 ohm drawing more.
Click to expand...


Ok. Thanks for clearing that up. I wasn't completely sure about that.
 
#9
Keep in mind, too, that on the 700RB, only the real highs...clicks and finger noise go to the high freq amp. This is quite different than the 800RB, where you can split the frequencies to actually involve the woofer.

The 700RB's high freq amp is only in the range of the tweeter.
 
#10
tornadobass said:
Keep in mind, too, that on the 700RB, only the real highs...clicks and finger noise go to the high freq amp. This is quite different than the 800RB, where you can split the frequencies to actually involve the woofer.

The 700RB's high freq amp is only in the range of the tweeter.
Click to expand...


I didn't realize that. Would it be the same for the 1001rb, and2001rb models?
 
#11
Yes...same thing...for the 1001RB. If you look at the PDF manual, you'll see that the woofers can run either full range or be trimmed at 5Khz (IIRC) and the tweeter can be capped at, I think, 10Khz.

But the crossover frequency is fixed. From the GK manual:

In the Bi-Amp configuration the 50W tweeter amp is always
operating from 5kHz and up (high frequencies only).
It will drive horns only and not cabinets.
Click to expand...
 

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