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-   -   Matching my 8 ohm amp to 16 ohm speakers. (http://www.diyaudio.com/forums/solid-state/1364-matching-my-8-ohm-amp-16-ohm-speakers.html)

DocJDG 5th December 2001 01:30 PM

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!

GRollins 5th December 2001 01:44 PM

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

walker 5th December 2001 01:46 PM

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.

DocJDG 5th December 2001 01:54 PM

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!

charly chile 20th April 2013 11:52 PM

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

EWorkshop1708 21st April 2013 07:06 AM

16 ohm speakers are fine for nearly any amplifier.

AndrewT 21st April 2013 08:42 AM

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.

Ian Finch 21st April 2013 09:55 AM

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.

AndrewT 21st April 2013 12:27 PM

Quote:

Originally Posted by charly chile (Post 3462319)
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.

AndrewT 21st April 2013 12:57 PM

Quote:

Originally Posted by charly chile (Post 3462319)
hi,
............. my amplifier is a Single ended 2Watt tube amplifier.
..............

Seems like a valve/tube amplifier. Probably transformer output.


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