Ohmmmmm, selmer type 8 ohm doubt?

lukedlb

My Kelly amp (a tidy Selmer treble &bass) has a single 16 ohm output and two 8 ohm outputs. Up until now, I’ve been using a single 8 ohm output. I would like to try plugging in an 8 ohm Leslie cab alongside my 8 ohm 4x12. I assume it goes in the other 8 ohm output, thereby reaching 16 ohm in series. 
Is that right?

ICBM

No, it will give 4 ohms in parallel. It should still be safe using both 8-ohm jacks though, if you’re not cranking it right up.

lukedlb

The 60 watt amp is loud at vol1 so cranking isn’t an option.
Does that mean I should be using two cabs, each running at 8 ohms, which the amp will run in parallel at 4 ohms?
What’s the logic behind this output as opposed to a Marshall double output with an ohm selector?

ICBM

lukedlb said:

The 60 watt amp is loud at vol1 so cranking isn’t an option.
Does that mean I should be using two cabs, each running at 8 ohms, which the amp will run in parallel at 4 ohms?

No, because the amp doesn't have a 4-ohm output. The best solution would be to make a series connection box so you can run both cabs from the 16-ohm output, but it probably doesn't matter if you're not cranking it.

lukedlb said:

What’s the logic behind this output as opposed to a Marshall double output with an ohm selector?

Cheaper to do and more reliable - a third jack is less expensive than a selector switch, and old Marshall selectors were notoriously unreliable and a major cause of blown output transformers.