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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 8th July 2018, 04:04 PM   #1
rock12 is offline rock12  United States
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I have an she an I am looking at zu audio speakers rated at 12 ohms will this be hard on the amp
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Old 8th July 2018, 05:13 PM   #2
Galu is online now Galu  Scotland
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If anything, 12 ohm will be easier for a solid state amp to drive.

Bit less power output compared to 8 ohm, but not enough to be noticeable.

If it's a tube amp then experiment with the 8 ohm and 16 ohm outlets (if fitted) and choose the one that sounds best.

Last edited by Galu; 8th July 2018 at 05:17 PM.
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Old 9th July 2018, 10:39 AM   #3
rock12 is offline rock12  United States
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I see my misspelling I have the tube lab SSE which I believe is set up for 8 ohms and wondering if 12 ohm speakers would work
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Old 9th July 2018, 11:11 AM   #4
Galu is online now Galu  Scotland
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I didn't see the tubelab reference until after I posted.

From the schematic, it appears that there are also 4 ohm and 16 ohm taps on the output transformer. You will be able to access them from inside the amp but must be experienced enough to do so safely.

I don't think the mismatch between the present 8 ohm tap and a 12 ohm speaker is sufficient to worry about, particularly as the impedance of the speaker varies with frequency.

The speaker may sound better on the 16 ohm tap, but you need to be prepared to get your soldering iron out and experiment.
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Old 10th July 2018, 10:04 AM   #5
rock12 is offline rock12  United States
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Old 12th July 2018, 04:56 PM   #6
tomchr is offline tomchr  Canada
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Running a 12 Ω speaker on an 8 Ω tap will work just fine. You'll get slightly lower output power and slightly lower distortion than you would with an 8 Ω speaker. Neither will be of any huge consequence.

Tom
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