What good is a 16 Ohm cab if you want to run 2 cabs?

[mightywarlock]

Just wondering,

as I've been trying to figure out if it is even possible to run 2 cabs, if I am running 16 ohms out of the amp, to a 16 Ohm cab,
am I stuck at only a half stack?

 

[chunktone]

Just wondering,

as I've been trying to figure out if it is even possible to run 2 cabs, if I am running 16 ohms out of the amp, to a 16 Ohm cab,
am I stuck at only a half stack?

NO, you can run multiple cabs. 2X16ohms=8 ohms.

 

[hellaboogie]

Just wondering,

as I've been trying to figure out if it is even possible to run 2 cabs, if I am running 16 ohms out of the amp, to a 16 Ohm cab,
am I stuck at only a half stack?

NO, you can run multiple cabs. 2X16ohms=8 ohms.

yes sir

 

[MatrixAmplification]

Those 16 ohm cabs are going to have to be in parallel to present an 8 ohm load.

 

[BeZo]

Those 16 ohm cabs are going to have to be in parallel to present an 8 ohm load.

Yeah, kinda like using both speaker outs in the back of the head.

If you have four speaker outs and four 16 ohm cabs, you can run them all on one head set to 4 ohms. That is, if you have enough amp to run four cabs. Most people don't. That's why we buy more gear. That's why we're here.

 

[racerevlon]

Any of your amps should have two speaker outputs and should be able to handle an 8-ohm load. Let us know exactly which amp and we can tell you for sure.

 

[petejt]

Those 16 ohm cabs are going to have to be in parallel to present an 8 ohm load.

nice. I feel like a n00b for only just realising this! But I am very glad to have seen it. I thought using two speaker outputs meant both of them were 16 ohms, or 8 or whatever you wanted.

 

[mightywarlock]

yeah, but the issue is, the only other cab i have that is 16 is my marshall (the 1960AV, and my Bogner Uberkab).

So in other words, You guys are saying if I wanted to run 2 cabs, I would come out of the amp (1 amp) both 8ohm outputs to each cab?

But am I giving the wrong load to the cabs/and/or the amp?

Can this harm either the Cab or the Amp in any way?

I'm used to running 2 cabs out of the 4ohm outputs of amps that have them, but into cabs that are 8ohms typically.

never really tried in 16 ohm cabs, as i was unsure how to split them, etc...

 

[mrkmas]

You connect the cabs to the amp with the jacks set for what the total cab load will be. you would set the amp for 8ohm and use 2 of the 8 ohm speaker jacks to connect to the cabs.
Amp>8ohm out 1> cabinet 1 set for 16ohm
Amp>8ohm out 2> cabinet 2 set for 16ohm

this is because the speaker outputs are in parallel, so you take the ohm of what the cabs are (both being 16) and divide by the amount of cabinets(connections) which is 16/2=8 ohm

note : the minute you decide to use one cabinet you will need to change the impedance back to 16ohm!!!

 

[mightywarlock]

You connect the cabs to the amp with the jacks set for what the total cab load will be. you would set the amp for 8ohm and use 2 of the 8 ohm speaker jacks to connect to the cabs.
Amp>8ohm out 1> cabinet 1 set for 16ohm
Amp>8ohm out 2> cabinet 2 set for 16ohm

this is because the speaker outputs are in parallel, so you take the ohm of what the cabs are (both being 16) and divide by the amount of cabinets(connections) which is 16/2=8 ohm

note : the minute you decide to use one cabinet you will need to change the impedance back to 16ohm!!!

Informative.

Thanks!

 

[mrkmas]

You connect the cabs to the amp with the jacks set for what the total cab load will be. you would set the amp for 8ohm and use 2 of the 8 ohm speaker jacks to connect to the cabs.
Amp>8ohm out 1> cabinet 1 set for 16ohm
Amp>8ohm out 2> cabinet 2 set for 16ohm

this is because the speaker outputs are in parallel, so you take the ohm of what the cabs are (both being 16) and divide by the amount of cabinets(connections) which is 16/2=8 ohm

note : the minute you decide to use one cabinet you will need to change the impedance back to 16ohm!!!

Informative.

Thanks!

not a problem man, glad to help!

 

[racerevlon]

Gotta read the back the back of the amp. Most amps (like the JVM for instance) have several taps that run something like this:

1 x 16 ohms (single tap)
1 x 8 ohms OR 2 x 16 ohms (two taps)
1 x 4 ohms OR 2 x 8 ohms (two taps)

Also remember that if the cabinets have different power ratings, there is going to be a difference in volume depending on the difference in the power ratings (example: one 100W cabinet w/Greenbacks in parallel with a 300W cabinet with G12T-75's.) Just because the load (ohms) are correct and you won't blow up your OT doesn't mean the volume will be level and it will sound right. You may have to attenuate one of them to get a volume match, unless you have all the same speakers, or the cabinets are configured identically. YMMV.

Hope this helps,

 

[mrkmas]

Gotta read the back the back of the amp. Most amps (like the JVM for instance) have several taps that run something like this:

1 x 16 ohms (single tap)
1 x 8 ohms OR 2 x 16 ohms (two taps)
1 x 4 ohms OR 2 x 8 ohms (two taps)

Also remember that if the cabinets have different power ratings, there is going to be a difference in volume depending on the difference in the power ratings (example: one 100W cabinet w/Greenbacks in parallel with a 300W cabinet with G12T-75's.) Just because the load (ohms) are correct and you won't blow up your OT doesn't mean the volume will be level and it will sound right. You may have to attenuate one of them to get a volume match, unless you have all the same speakers, or the cabinets are configured identically. YMMV.

Hope this helps,

Vey true!!! forgot to mention the possible volume difference as I always use the same cabinets.

 

[Giga]

Gotta read the back the back of the amp. Most amps (like the JVM for instance) have several taps that run something like this:

1 x 16 ohms (single tap)
1 x 8 ohms OR 2 x 16 ohms (two taps)
1 x 4 ohms OR 2 x 8 ohms (two taps)

Also remember that if the cabinets have different power ratings, there is going to be a difference in volume depending on the difference in the power ratings (example: one 100W cabinet w/Greenbacks in parallel with a 300W cabinet with G12T-75's.) Just because the load (ohms) are correct and you won't blow up your OT doesn't mean the volume will be level and it will sound right. You may have to attenuate one of them to get a volume match, unless you have all the same speakers, or the cabinets are configured identically. YMMV.

Hope this helps,

Coincidentally and as far as I remember the 25W greenbacks and T75's have the same sensitivity. (97 db?) The cabs you're referring to will sound equally loud.

Giga