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Do 16 ohm loads present any particular challenges to amps?
Do 16 ohm loads present any particular challenges to amps?
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Old 25th October 2021, 10:03 PM   #1
SoaDMTGguy is offline SoaDMTGguy  United States
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Do 16 ohm loads present any particular challenges to amps?
Default Do 16 ohm loads present any particular challenges to amps?

Since 16 ohm loads demand less power than 8 or 4, it seems like any amp that could do 8 ohms could deliver at least as much power into 16. Are there any other factors Iím not aware of that would affect this?

As a related question: If a speaker varies between 4 and 16 ohms over the frequency spectrum, would wny amp that can deliver sufficient power at 4 ohm be appropriate? What if itís a tube amp? Would it need to have an autoformer output?
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Old 25th October 2021, 10:05 PM   #2
Mark Johnson is offline Mark Johnson  United States
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Do 16 ohm loads present any particular challenges to amps?
Vacuum tube amps with output transformers are often fussy about the load impedance.
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Old 25th October 2021, 10:16 PM   #3
SoaDMTGguy is offline SoaDMTGguy  United States
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Do 16 ohm loads present any particular challenges to amps?
Quote:
Originally Posted by Mark Johnson View Post
Vacuum tube amps with output transformers are often fussy about the load impedance.
Arenít tube amps without output transformers even fussier about load impedance?
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Old 25th October 2021, 10:19 PM   #4
Galu is offline Galu  Scotland
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Is it valve amps that you wish to discuss, and not solid state?
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Old 25th October 2021, 11:56 PM   #5
rayma is offline rayma  United States
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Quote:
Originally Posted by SoaDMTGguy View Post
Aren’t tube amps without output transformers even fussier about load impedance?
They have limited output current, and are best with high impedance speakers.
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Old 26th October 2021, 12:26 AM   #6
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by SoaDMTGguy View Post
Arenít tube amps without output transformers even fussier about load impedance?
What is your actual problem?
You keep changing focus.

You should have stated this very specific case in the original question, instead of making a very generic one and after answers: "oh! but thatīs not what Iīm interested in".
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Old 26th October 2021, 02:45 AM   #7
SoaDMTGguy is offline SoaDMTGguy  United States
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Do 16 ohm loads present any particular challenges to amps?
Quote:
Originally Posted by JMFahey View Post
What is your actual problem?
You keep changing focus.

You should have stated this very specific case in the original question, instead of making a very generic one and after answers: "oh! but thatīs not what Iīm interested in".
I had two related questions:

1. Does a 16 amp load present a challenge to amplifiers as a 4 ohm load does? (both being deviations from the "standard" 8 ohms)

2. What about for tube amplifiers?

The only answer I got was:

Quote:
Vacuum tube amps with output transformers are often fussy about the load impedance.
I was confused by this, because (unless I am mistake) all tube amps either have an output transformer or no output transformer, and I know that OTL tube amps are *extremely* fussy about load impedance.

Mark Johnson seemed to be saying that tube amps with output transformers are fussy about the impedance, *but some other type aren't* (implication added)
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Old 26th October 2021, 03:08 AM   #8
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by SoaDMTGguy View Post
Since 16 ohm loads demand less power than 8 or 4, it seems like any amp that could do 8 ohms could deliver at least as much power into 16. Are there any other factors I’m not aware of that would affect this?
If a amp is rated for 100 watts @ 8 ohms and you use a 16 ohm speaker you will only get 50 watts @ 16 ohms.

Its also about what max volts the amp will put out too.

I used to run a mobile disco off 16 ohm speakers.
I used 4 in parallel to get 4 ohms.
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Last edited by nigelwright7557; 26th October 2021 at 03:17 AM.
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Old 26th October 2021, 03:15 AM   #9
SoaDMTGguy is offline SoaDMTGguy  United States
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Do 16 ohm loads present any particular challenges to amps?
Oh right, because going down to 4 ohms increases power (if available), so going up decreases.

And then about voltage; So if I need 100w and my amp will do 200w at 8 ohm, it’s no guarantee that it can do 100w at 16 ohm because it may become voltage limited.

Thank you! A simple answer, but it all clicked for me.
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Old 26th October 2021, 03:21 AM   #10
nigelwright7557 is offline nigelwright7557  United Kingdom
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Yes if its 200w @ 8 ohms it will do 100w at 16 ohms.
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