4 OHMS + 8 OHMS= ???

[stonedbassist]

Originally posted by JoelEoM
im doing the same thing with my rig right now-
hartke HA2000
hartke 2.5XL(8ohm)
Ampeg V-4B 2x15(4ohm)

the head is 200 watts at 4 ohms, it has 2 8ohm outputs. im still kinda confused from reading above..
i know im running the amp at 2.67ohms(correct?) but i want to know how a load like this could potentially damage it. i dont know a whole lot about resistances...or am i ok with running my rig like this?

hmmm... simmilar to mine, HA4000 head, 4200 cab
i want to get a 1x15, but i think i need to find a 16 ohm cab. do they even exist?

 

[Dean_CustomJazz]

Would it be possible to do the same thing with a hartke 3500 head with the 4/8 ohm combination?
I rather save some bucks, plus ive played the hartke 3500 god knows how many times. the 3500 is rated 4 ohms, could it handle the 2 ohm load with blowin up?

 

[geshel]

Note: 4-ohm cab plus 16-ohm cab (in parallel) equals 3.2 ohms.

And the 4-ohm cab gets four times the power that the 16-ohm cab gets. Not recommended.

 

[stonedbassist]

thanx, i e-mailed hartke about it a long time ago, but i hadnt thought about the 16-ohm cab yet, i only asked about annother 4-ohm, which wouldnt work.

 

[Blues Bass 2]

The Hartke can only go to 4ohms,not below,so no it wouldn't work.

 

[Asperger67]

True, but... Most cabs are not designed to be wired in series. In fact, I've never personally seen a cab that you could wire in series. So the series/parrallel thing isn't really an issue. For common use, you won't be able to wire in series. That requires some fancy internal wiring.

Another thing to keep in mind. Amp and cab impedence ratings are approximate ratings, so a 4 ohm cab might be something like 4.1 ohms. Plus, impedence varies slightly with wattage, so you can never perfectly measure a constant impedence. I believe this is right; correct me if I'm wrong.

10 + thread....anyway, Impedence mostly varies with Fréquency ans as you said 'Indication' on the back plate its allways quite approximative - you can find it out tasting it with a Multimèter.

 

[agedhorse]

10 + thread....anyway, Impedence mostly varies with Fréquency ans as you said 'Indication' on the back plate its allways quite approximative - you can find it out tasting it with a Multimèter.

No, a multimeter will only give the measurement at DC. This is not the nominal impedance, which is an average of impedance over frequency.

 

[Asperger67]

No, a multimeter will only give the measurement at DC. This is not the nominal impedance, which is an average of impedance over frequency.

Bien vu et bien dit ! Maths... ;-)

 

[Patrice B]

Bien vu et bien dit ! Maths... ;-)

Tut! Tut! On ne parle pas français ici !

 

[abarson]

10 + thread....anyway, Impedence mostly varies with Fréquency ans as you said 'Indication' on the back plate its allways quite approximative - you can find it out tasting it with a Multimèter.

You realize that this thread is old enough to drink and drive, right?

 

[seamonkey]

I think that when this thread started that "******" didn't exist. Now I can't believe that it still exists
Let Me Google That

Best thing is it leads back to TalkBass still!

 

[Asperger67]

Tut! Tut! On ne parle pas français ici !

;-)