Quick ohm question

[billboogie]

I have an Orange TH30 head. The speaker outputs are one 16ohm and two 8ohm jacks. Can I use two 8ohm cabs or do have to be 16 ohm cabs? Please help,

Thank you
Bill

 

[D-Rock]

Sounds like they are similar to Mesa amps speaker input jacks, where they are label as impedance value inputs.

So,
- the 16 ohm jack is for a single 16 ohm cab to be plugged into (result=16ohms)
- a single 8 ohm jack is for one 8 ohm cab input (result=8ohms)
- both 8 ohm jacks for two 16 ohm cabs to be plugged into (result=8ohms)

 

[TrueTone500]

You can run either 1 x 8 Ohm or 2 x 16 Ohm cabs in the 8 Ohm outputs. Use only 16 Ohm cab in the 16 Ohm output.

 

[stephen sawall]

I would not guess ... that would be a 4 ohm load & could do damage if the amp is not set up for that.

 

[billboogie]

Okay I found a manual online and it reads one 16ohm cab in the 16ohm input.....one 8ohm cab in 8ohm input........two 16ohm cabs in each 8ohm input........???????? Confused......

 

[LP Freak]

When you add an additional cabinet you have double the ohms of the cabinets or half the ohms on the amp... which ever way you want to look at it.

 

[stephen sawall]

If a amp does not have two 4ohm jacks you do not want to plug two 8ohm cabinets into it. If you are not sure contact Orange is my advise ..... If you are guessing & do this you could do damage to your amp. Transformers are not cheap.

 

[LP Freak]

^ Good advice.

 

[billboogie]

Thanks for your help everyone.... I am bringing one 8 ohm cab tonight.......guess some rewiring and speaker changes are coming. BTW the new 60watt v-30 sounds amazing with this head. Thanks again..........

 

[thunda]

the 8 ohm jacks are for a *total* load of 8 ohms. In other words, one 8 ohm cab, or two 16 ohm cabs.

 

[racerevlon]

the 8 ohm jacks are for a *total* load of 8 ohms. In other words, one 8 ohm cab, or two 16 ohm cabs.

^^^This -- the two 8-ohm jacks are wired in parallel. You need to connect two 16-ohm cabs to them to produce an 8-ohm load.

 

[TrueTone500]

If you had a variable impedance amp with 4-8-16 Ohm select switch with 2 x outputs, you would connect them:
1 x 4 Ohm can set to 4 Ohms
1 x 8 Ohm set to 8 Ohms
1 x 16 Ohm set to 16 Ohms.
If you were running 2 cabinets, you would connect them:
2 x 8 Ohm cabs at 4 Ohms.
2 x 16 Ohm cabs at 8 Ohms. You would never run 2 x 4 Ohm cabinets.

Your amp is fixed impedance amp and should be connected like this:
Connect 1 x 16 ohm cabinet to the 16ohm speaker output jack socket.
Connect 1 x 8 ohm cabinet to either of the 8ohm speaker output jack sockets.
Connect 2 x 16 ohm cabinets to both of the 8ohm speaker output jack sockets.

 

[KingRicky]

My amp has 2 speaker outs and a 4, 8. 16 ohms selector switch. The amp is a combo with a 16 ohm speaker that does not disconnect when external speakers are plugged in. If I have a 2x12 with 16 ohm speakers in it would I need to set the impedance at 4 ohms?

 

[stephen sawall]

My amp has 2 speaker outs and a 4, 8. 16 ohms selector switch. The amp is a combo with a 16 ohm speaker that does not disconnect when external speakers are plugged in. If I have a 2x12 with 16 ohm speakers in it would I need to set the impedance at 4 ohms?

It depends on how the 2x12 is wired...... is the 2x12 cab a 8 ohm cab ?

If yes ~ It would be safe to use the 4 ohm setting on your combo when using the 2x12 also. ..... But it will not sound balanced. The only way to get a balanced sound is if you use your combo with a other 1x12 that is rated 16 ohms.

But who knows .... you might like the sound better with the 3x12's running ?

 

[petejt]

If you had a variable impedance amp with 4-8-16 Ohm select switch with 2 x outputs, you would connect them:
1 x 4 Ohm can set to 4 Ohms
1 x 8 Ohm set to 8 Ohms
1 x 16 Ohm set to 16 Ohms.
If you were running 2 cabinets, you would connect them:
2 x 8 Ohm cabs at 4 Ohms.
2 x 16 Ohm cabs at 8 Ohms. You would never run 2 x 4 Ohm cabinets.

Your amp is fixed impedance amp and should be connected like this:
Connect 1 x 16 ohm cabinet to the 16ohm speaker output jack socket.
Connect 1 x 8 ohm cabinet to either of the 8ohm speaker output jack sockets.
Connect 2 x 16 ohm cabinets to both of the 8ohm speaker output jack sockets.

Thanks for this.

 

[KingRicky]

My amp has 2 speaker outs and a 4, 8. 16 ohms selector switch. The amp is a combo with a 16 ohm speaker that does not disconnect when external speakers are plugged in. If I have a 2x12 with 16 ohm speakers in it would I need to set the impedance at 4 ohms?

It depends on how the 2x12 is wired...... is the 2x12 cab a 8 ohm cab ?

If yes ~ It would be safe to use the 4 ohm setting on your combo when using the 2x12 also. ..... But it will not sound balanced. The only way to get a balanced sound is if you use your combo with a other 1x12 that is rated 16 ohms.

But who knows .... you might like the sound better with the 3x12's running ?

I do woodworking on the side and have always loved the look of a Marshall 1936 so that is what I was going for. I can change that to a 1x12 very easy. I am going to use a GWS Veteran 30.

If I was to install 3 jacks, two going to each speaker( I could then run a cable from each of the speaker outs to each of the speakers and set impedance to how I need it) 8 ohms for one speaker or 4 ohms for both speakers. The third jack would have a switch to run both speakers if needed for a amp with only one speaker out (this would make the cab an 8 ohm). Would this work?

 

[stephen sawall]

If I was to install 3 jacks, two going to each speaker( I could then run a cable from each of the speaker outs to each of the speakers and set impedance to how I need it) 8 ohms for one speaker or 4 ohms for both speakers. The third jack would have a switch to run both speakers if needed for a amp with only one speaker out (this would make the cab an 8 ohm). Would this work?

? .... sounds right if I understand correct.

....But only running half a 2x12 usually does not sound very good. The reason why is the speaker not being used moves when not plugged in. So the cabinet is not solid like a closed back cab. If it is open back it would not be much better.

My advise is only build a single 12 cab with a 16 ohm speaker if you want it to use with your combo. If you want a 2x12 for a other amp build one for that amp ..... or a pair of 1x12. The cabinet effects the sound just as much as what speaker is being used. The other option is put a male & female jack in your combo .... so you can disconnect you combo speaker & hook it up to any cab you want.

What works & what sounds good are two different things. What sounds good is only taste. Messing with a odd set-ups usually does not get great results. But your taste might like it.

 

[KingRicky]

If I was to install 3 jacks, two going to each speaker( I could then run a cable from each of the speaker outs to each of the speakers and set impedance to how I need it) 8 ohms for one speaker or 4 ohms for both speakers. The third jack would have a switch to run both speakers if needed for a amp with only one speaker out (this would make the cab an 8 ohm). Would this work?

? .... sounds right if I understand correct.

....But only running half a 2x12 usually does not sound very good. The reason why is the speaker not being used moves when not plugged in. So the cabinet is not solid like a closed back cab. If it is open back it would not be much better.

My advise is only build a single 12 cab with a 16 ohm speaker if you want it to use with your combo. If you want a 2x12 for a other amp build one for that amp ..... or a pair of 1x12. The cabinet effects the sound just as much as what speaker is being used. The other option is put a male & female jack in your combo .... so you can disconnect you combo speaker & hook it up to any cab you want.

What works & what sounds good are two different things. What sounds good is only taste. Messing with a odd set-ups usually does not get great results. But your taste might like it.

Think I'll go with a 1x12.