Impedance/Resistance Questions

[YJM_Rocks]

So...possibly getting a new amp head and cab soon. Behringer LX1200H and one of their cabs. The amp is 1 x 4 Ohms mono or 2 x 8 Ohms stereo. So this would mean to run mono I would want a 4 Ohm cab \with a high enough watt rating to handle the amp right? http://www.musiciansfriend.com/srs7/g=home/search/detail/base_pid/480689/ This cab is 16 Ohms mono or 2 x 8 stereo. I'm just really confused since in the LX1200h manual i downloaded from MF they reccomend this cab, but it's 400 watt handling in mono at 16 Ohms. This is really confusing me. :smack: Could someone give me a quick lesson about resistance and impedance? I searched but couldn't come up with much.

 

[YJM_Rocks]

Re: Impedance/Resistance Questions

bumpo

 

[That90'sGuy]

Re: Impedance/Resistance Questions

So...possibly getting a new amp head and cab soon. Behringer LX1200H and one of their cabs. The amp is 1 x 4 Ohms mono or 2 x 8 Ohms stereo. So this would mean to run mono I would want a 4 Ohm cab \with a high enough watt rating to handle the amp right? http://www.musiciansfriend.com/srs7/g=home/search/detail/base_pid/480689/ This cab is 16 Ohms mono or 2 x 8 stereo. I'm just really confused since in the LX1200h manual i downloaded from MF they reccomend this cab, but it's 400 watt handling in mono at 16 Ohms. This is really confusing me. :smack: Could someone give me a quick lesson about resistance and impedance? I searched but couldn't come up with much.

It looks to me like the cabinet wasn't made for your particular head. If it specifically states in the manual for the head that it needs a 4 ohm cab, I'd try to match it dead on.

Impedance includes not only the resistance, but the reactance in a circuit.

Resistance is simply what is working against the amperage (or flow of electrons, aka "electricity" in a circuit).

 

[YJM_Rocks]

Re: Impedance/Resistance Questions

Bump again, still confused. I know I would have to match the impedance, 4 ohm amp/4 ohm cab, but MF must be incorrect about the cab since the manual says its a 4 ohm. I'll check the behringer website.

 

[YJM_Rocks]

Re: Impedance/Resistance Questions

Well MF is correct, i checked the beringer website. Why would behringer reccomend a 16 mono/2x8 stereo cab for this amp? With 400 watt power handling? It just doesnt seem right.

 

[The Golden Boy]

Re: Impedance/Resistance Questions

Although I despise all things Behringer, does the head have any sort of impedance selector?

 

[Pink Unicorn Horsey]

Re: Impedance/Resistance Questions

Is this the amp you're getting?

http://www.musiciansfriend.com/srs7/g=guitar/search/detail/base_id/120144

If so, there's no problem running this amp out in stereo to the cab. Just make sure you're setting the cab to stereo, not mono. If you want to use the cab mono, you can do that because the cab's resistance is 16 ohms in mono and the head requires a load of 4 ohms or more. (The last time I checked, 16 was more than 4.)

Does this make sense?

 

[YJM_Rocks]

Re: Impedance/Resistance Questions

Will stereo give me the same kind of volume as mono? If it does theres not any problem, but i'm no expert...

 

[Pink Unicorn Horsey]

Re: Impedance/Resistance Questions

I believe you'll get just as much power. I think it's pretty cool that this cab has mono/stereo capability.

 

[YJM_Rocks]

Re: Impedance/Resistance Questions

Cool, sounds like the way to go. I was going to get a Peavey Classic 30 combo, but this will be so much more versatile. Thanks for the help.

 

[ErikH]

Re: Impedance/Resistance Questions

I just read the manual and it says "minimum" 4 ohms impedance 120 watt mono and "minimum" 8 ohm/60 watt each in stereo.

Don't go below those numbers and you're fine.

 

[Pink Unicorn Horsey]

Re: Impedance/Resistance Questions

Current is pushing its way through the circuits (figuratively speaking) and if your load isn't heavy enough it will allow too much current to pass through at once, which will cause damage to the circuits.

It's almost like if you try to put too much water through a hose at one time; the hose will burst and you're f'ed. (In this analogy the hose is the load and the water is the current.)

 

[Zhangliqun]

Re: Impedance/Resistance Questions

Cab or speaker ohm rating must be equal to or higher than the amp ohm rating.

4 ohm amp + 8 ohm cab = will work fine but not at the ideal.

8 ohm amp + 4 ohm cab = CALL THE FIRE DEPT.!!!!

 

[Pink Unicorn Horsey]

Re: Impedance/Resistance Questions

Right. The ideal is to match the amp ohm rating with the cab ohm rating.