Connect 8ohm and 16ohm in one amp?

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jorisguitars
Posts: 8
Joined: Wed Oct 14, 2015 11:55 am

Thu Nov 05, 2015 4:01 pm

Hello,

So i have the ht5 head which has 2x16 ohm output, and one 8ohm output. I got Two cabs, one that takes 8 ohm, and one that takes 16ohm.

Question:
May i connect both speakers to this head? So one cab (8ohm) to 8ohm head, and one cab (16ohm) to 16ohm head at the same time?

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thephantum
Posts: 1160
Joined: Wed Jan 29, 2014 7:42 pm
Location: Virginia, United States

Thu Nov 05, 2015 6:53 pm

No. The output transformer is not designed to utilize both taps at once. So you can use either the 8 ohm tap or the 16 ohm tap, but cannot use both at the same time.

However, you could plug both cabs into the 8 ohm tap. That would give a total load of 5.33 ohms, which is lower than nominal. It's not ideal, but it also won't hurt anything either. With tube amps it's always better to go lower than higher. In addition, most output transformers can take up to a 2x mismatch.

For the record, the 8 ohm tap is labeled "2x16 ohm or 1x8 ohm" (two jacks). The 16 ohm tap is labeled "1x16 ohm" (one jack).
Last edited by thephantum on Thu Nov 05, 2015 8:18 pm, edited 1 time in total.

jorisguitars
Posts: 8
Joined: Wed Oct 14, 2015 11:55 am

Thu Nov 05, 2015 7:42 pm

Thanks that helps!

jorisguitars
Posts: 8
Joined: Wed Oct 14, 2015 11:55 am

Thu Nov 05, 2015 10:45 pm

One more question...

Can i use the 8ohm output of my ht5 to connect to a speaker that is 16ohm?
I found the 1X12 Blackstar ht 112 seventy 80's sounding better when connected to the 8ohm instead of 16. Takes of the harsh top end off a bit.

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thephantum
Posts: 1160
Joined: Wed Jan 29, 2014 7:42 pm
Location: Virginia, United States

Thu Nov 05, 2015 11:24 pm

It should be ok. The key word there is "should". As stated above, with tube amps it's always better to go low then go high. So you are both going high AND going right to the 2x edge.

Riverman222
Posts: 1
Joined: Fri Jun 21, 2019 7:01 pm

Tue Nov 26, 2019 10:02 pm

How do you connect another speaker to the 8ohm tap when there's only one 8ohm tap? Or are you saying the 8ohm where it normally goes then a 16ohm in the other 2x16ohm tap. And if so instead of another 16ohm speaker I could hook up another 8ohm ( so now two 8ohm speakers plugged into the 2x16 ohm outputs)but be running at the 2x limit of 4ohms but at least it's under. Always a risk but SHOULD be ok? And only hurting tubes not amp right?

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