Umm...Ohms? Ehh..help

[Pawn]

umm.. after reading all that
I think i get it..

Thanks everyone

 

[bigbeefdog]

Ummm.... now you're confusing even me....

No, you can't "add" a 2 ohm load *if you're already driving the 4 ohm load represented by your internal speaker*. If you drive a 2 ohm load in addition to a 4 ohm load, you get a total lower than 2 ohms, which is bad. All the speakers hooked up to the amp, *including the internal one* (if you're using that one too)* must add up to a load no lower than 2 ohms.

I know my eyes are failing in my old age, but I didn't see where Pawn suggested adding a 2-ohm cab to his existing 4-ohm internal one.

Thus, if you use the 4 ohm internal speaker, any other cabs you hook up, whether a single cab or more than one, must add up to a total of *no less than 4 ohms*. This means, for example, one 4 ohm cab, two 8s, an 8 plus two 16s, or four 16s.

I'm not familiar with his amp, but in his first post, he suggested it was stable down to 2 ohms. *If that's true*, this last quote doesn't apply.... you absolutely could add a 4-ohm external cab to your 4-ohm internal, and run safely with a 2-ohm connected load. Or add an 8-ohm, and run safely with 2.67.

EDIT: OK, I see where our thinking disconnects. Pawn, when we talk about the total connected load, that *includes* your internal speaker.

So that post above is correct in terms of the cabs connected to your amp. If you use the internal speaker, for load calculation purposes, *that is a 4-ohm cab*. You can then add *one* 4-ohm external, or *two* 8-ohm externals, all connected in parallel, and be OK. Or, if your amp allows you to disconnect the internal speaker entirely (some do), you can use external cabs *only*.

Sorry Richard.... you were thinking "add cabs to the combo", and I was thinking "add cabs to the power amp's output"....

 

[Richard Lindsey]

Sorry Richard.... you were thinking "add cabs to the combo", and I was thinking "add cabs to the power amp's output"....

No problem at all. The main thing is that the guy gets to do what he needs to do without doing something harmful.

 

[Pawn]

How do you know that the internal speaker is 4 ohms?

Thanks

 

[bigbeefdog]

How do you know that the internal speaker is 4 ohms?

Thanks

It was stated earlier in the thread.... but not by you, I see.

Check the specs/owner's manual to be sure.

 

[i_got_a_mohawk]

How do you know that the internal speaker is 4 ohms?

Thanks

because it just is, thats why they give the output at 4ohms and not 8ohms

just accept it