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Old 6th January 2006, 09:00 PM   #1
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Default Is there anything higher than 8 Ohm speakers?

I was wondering why 8 Ohms seems to be the starting point form resistance into a speaker?? Can there be a 10 Ohm or even higher Ohm speaker?

I was thinking that a speaker with a greater Ohm rating would be easier for my LM4780 amplifier to push??? Am I right?


Dominick in New Jersey
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Old 7th January 2006, 04:01 AM   #2
TerryO is offline TerryO  United States
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Default Re: Is there anything higher than 8 Ohm speakers?

Quote:
Originally posted by Dominick22
I was wondering why 8 Ohms seems to be the starting point form resistance into a speaker?? Can there be a 10 Ohm or even higher Ohm speaker?

I was thinking that a speaker with a greater Ohm rating would be easier for my LM4780 amplifier to push??? Am I right?


Dominick in New Jersey

Dominick,
Back in the bad old days of tubes there were many speakers that had higher Ohm specs, 16 ohms wasn't all that unusual. My focused arrays are series/parallel wired and measure 9.9 Ohms across the terminals. I have a LM4780 chip amp (a custom job by Kevin Haskins) and these sound very good indeed. At the Seattle DIY Meet held at Adire last October, we used the 4780 in the upstairs room for most of the day and none of the builders requested a change to another amp. I really don't see any advantage to any speaker over 8 Ohms, at least with SS amps. With Tubes, YMMV.
Best Regards,
TerryO
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Old 7th January 2006, 04:43 AM   #3
el`Ol is offline el`Ol  Germany
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PHY-HP drivers are 16 Ohm. And as far as I know 16 Ohm (and high sensitivity) are essential for the 6C33 OTL (transformerless) amplifier concepts.
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Old 7th January 2006, 09:47 AM   #4
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Scan Speak have a 16ohm mid-bass, here.
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Old 7th January 2006, 10:12 AM   #5
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Once upon a time, Phillips made, I believe, an 800ohm (!) 12" wide-range / full-range driver. It was mentioned on the Single Driver Site when Herbert Jeschke stuffed some into a pair of 8" tall 'Voigt Pipes' (P.G.A.H. Voigt must be spinning in his grave -see here if you want to look at them: to be fair, thy certainly look impressive! http://melhuish.org/audio/oswaldsmill.html).
Now, I take that value with about a ton of salt, but you get the idea. The original, legendary BBC LS3/5a was nominally rated at 15ohms; it's computer-optimised second varient (which Harbeth reckon really should have been called the LS3/5b, so many changes were made) was rated at 11ohms. So yes, indeed you can get higher. 8ohms is the most common, though that doesn't necessarily mean they will be!

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Old 7th January 2006, 11:10 AM   #6
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There's a WR125 that's 16 ohms.
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Old 7th January 2006, 11:56 AM   #7
el`Ol is offline el`Ol  Germany
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If you are interested in really bad drivers you can get a 750 Ohm Freischwinger from the thirties/ fourties. Probably they were only used to let Adolf sound rrrrrreally horrrrrrible.
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Old 7th January 2006, 12:38 PM   #8
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The worst driver I ever came across was a big, 10" bextrene job from 1976 or thereabouts I think. 12ohm, 82db sensitivity, and about as rigid as a politician's morals. The sound... well, you know the frequent complaint about plastic cones was that they 'quacked'? This thing sounded like a country pond full of mallards. Needed 200wpc to say boo to a goose (or another duck for that matter.) Unutterably vile.
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Old 8th January 2006, 07:35 PM   #9
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A number of PA drivers come in 16 ohm
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Old 8th January 2006, 07:55 PM   #10
dnsey is offline dnsey  United Kingdom
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Many early transistor radios were fitted with 25 - 35 Ohm speakers, to avoid the need for an output transformer. Academic really nowadays and in a Hi-Fi context
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