Matching my 8 ohm amp to 16 ohm speakers. - diyAudio
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Old 5th December 2001, 02:30 PM   #1
DocJDG is offline DocJDG  United States
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I'm making a cabinet for a 100w stereo (50w per channel) hybrid amp. I got a good deal on Celestion G12 50w speakers but the only catch is that they were 16ohm speakers and my amp has 8 ohm outputs. At the price I got the speakers, I thought that I could just wire them in parallel to cut the impedence down to the 8 ohms that I need and live with a mono speaker cabinet. But now I'm getting greedy! Does anyone have a SIMPLE design for an impedence matching curcuit that I could use? I've looked around and found lots of theory discussions on it but no practical info. I'm a med student and not an engineer, so I need some simple instructions. Thanks!
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Old 5th December 2001, 02:44 PM   #2
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It's not a problem.
Solid state (which I assuming is what your amp is) doesn't mind 16 ohm impedances (for that matter, tubes absolutely love 16 ohm speakers, so you're covered either way). Use 'em as is. It won't break anything. Using 16 ohm speakers on an amp rated for 8 ohms halves the rated wattage. Don't worry about it. The bottom line is whether you've got enough power (regardless of what impedance your speaker is) to get to your normal listening volume.

Grey
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Old 5th December 2001, 02:46 PM   #3
walker is offline walker  Australia
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Doc, you should have no problems driving 16 ohm speakers with an 8 ohm amplifier. In fact the amp will have much lower impedance, much less than 1 ohm usually. You will not get the specified full output from the amp and it will usually run cooler. The output loss probably won't be noticeable.

Things do change a little if you are using a valve amp, if this is the case I still can't see a problem.
Problems can arise when driving a 4 ohm speaker with an amp that is designed for 8 ohms only.

Regards WALKER

Gee Grey it's the quick or the redundant post around here isn't it.
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Old 5th December 2001, 02:54 PM   #4
DocJDG is offline DocJDG  United States
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Default Thanks!

Maybe I'm just not looking in the right places but those are the two first straight answers I've gotten to the question. Halving the wattage isn't a big deal -- I ain't exactly Hendrix. Sorry to bug you with a no-brainer. Thanks!
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Old 21st April 2013, 12:52 AM   #5
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hi,
i had the same question, and have found this. thanks.
In my case my amplifier is a Single ended 2Watt tube amplifier.
sound like I should try to avoid 16 ohms speakers, since power is an issue here.

best
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Old 21st April 2013, 08:06 AM   #6
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16 ohm speakers are fine for nearly any amplifier.
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Old 21st April 2013, 09:42 AM   #7
AndrewT is offline AndrewT  Scotland
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Does the output transformer have tappings for different speaker loading?

I'm told that Valve/Tube amplifiers must have a load connected, which is quite different from Solid State which can operate with infinite load impedance.
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Last edited by AndrewT; 21st April 2013 at 09:53 AM.
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Old 21st April 2013, 10:55 AM   #8
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I think a hybrid amp usually has a solid state output stage with tube input/VAS stage. i.e . no transformer to be worried about.
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Old 21st April 2013, 01:27 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by charly chile View Post
hi,
i had the same question, and have found this. thanks.
In my case my amplifier is a Single ended 2Watt tube amplifier.
sound like I should try to avoid 16 ohms speakers, since power is an issue here.

best
Seems like a valve/tube amplifier. Probably transformer output.
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Old 21st April 2013, 01:57 PM   #10
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by charly chile View Post
hi,
............. my amplifier is a Single ended 2Watt tube amplifier.
..............
Seems like a valve/tube amplifier. Probably transformer output.
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