8 Ohm plus 4 Ohm?

[aurian4parker]

My head has a maximum of 4 ohms. It can take two cabs however.

therefore I could not plug two 4 ohm cabs straight into the head.


however...My avatar has two parallel outputs. If my cab is rated at 4 ohms, and I daisy chained another cabinet to it, would that make 2 ohms be going into my head? or still 4 ohms?

basically, I have a 4 ohm cabinet and I want a way to add another cabinet to it. how is this possible?

 

[JoeyNaeger]

It isn't. A 4 ohm and 8 ohm cabinet would yield 8/3 ohms which is just under 3 ohms.

 

[asad137]

basically, I have a 4 ohm cabinet and I want a way to add another cabinet to it. how is this possible?

The only way to do it with your head is to get a specially wired 'series cable' that will make the total impedance 12 ohms. Your amp (if solid state) will produce significantly less power into a 12-ohm load as it will into a 4-ohm load, however.

Asad

 

[73jbass]

An 8 and 4 ohm cab in parallel would give you about 2.6ohms.

 

[aurian4parker]

So the only way to have two cabs on this amp and get full power out of it is have two 8 ohm cabs?

And If i was to daisy chain another 4 ohm cab onto my avatar that would still = 2 ohms?

 

[Rick Auricchio]

Yes, a pair of 8-ohm cabs will provide a 4-ohm load for the amp.

Daisy-chaining cabs almost always puts them in parallel. A pair of 4s will give you 2.

 

[otis_thick]

If the amp is not rated to 2ohm and/or below...8ohm + 4ohm=Blown amp (unless wired in series) and that = lower amp output.

 

[Luke73]

Or you could have 4 x 4ohm cabs in series/parallel and blow the house down with your 4 ohm monster.

 

[lhoward]

If the amp is not rated to 2ohm and/or below...8ohm + 4ohm=Blown amp (unless wired in series) and that = lower amp output.

But you probably will not be using maximum output and depending on the volume you expect, it may not be that much of an issue.

My head has a maximum of 4 ohms. It can take two cabs however. therefore I could not plug two 4 ohm cabs straight into the head.

however...My avatar has two parallel outputs. If my cab is rated at 4 ohms, and I daisy chained another cabinet to it, would that make 2 ohms be going into my head? or still 4 ohms?

basically, I have a 4 ohm cabinet and I want a way to add another cabinet to it. how is this possible?

Actually, think of impedance in terms of minimum rather than 'maximum'. Its the minimum impedance that determines if the power amp in the head can supply the higher current to the speaker load without burning up its components. Two 4 ohm cabs in parallel (the usual wiring config) will yield a minimum 2 ohm load. The optimum config, for an amp which can only support a minimum 4 ohm load, would be 2-8 ohm cabs in parallel for a 4 ohm load, or get a head that can handle a minimum of 2 ohm loads and provide the power output you think you need into 2 ohms. That way you could use your existing 4 ohm cab and add on another 4 ohm or an 8 ohm cab.

Lloyd Howard

PS: Interesting link on impedance from another thread: http://www.bcae1.com/spkrmlti.htm

 

[baalroo]

Ok, how about this scenario then (I hope this doesn't completely hijack the thread, but it's a similiar situation anyhow):

My amp (hartke model 2000) has 2 seperate outputs, currently I'm running a single no-name 15", if I use the other output to run to a 2x10 does it matter what Ohms the 15" is or are the two seperate outputs completely independent of each other?

 

[lhoward]

You may have two output jacks, but I've seen nothing from Hartke that says the 2000 has two separate outputs. It only mentions that it has one power amp section. So it does matter what the impedance is of the other cabinet you want to plug in. The two jacks are most likely parallel outputs of the same power amp. Check the link below:

[Invalid or Expired Link Removed]

L. Howard