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Old 20th October 2010, 09:54 PM   #1
nige838 is offline nige838  United States
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Default What is the highest ohm speaker?

I've been building several tube amplifiers lately and had the idea to eliminate the output transformer (or at least make it's values smaller). It seem like there is a lot of energy and expense that is lost in this last step...

Anyways, I'm curious if anybody's head of a speaker that is higher than 16ohm? Anybody have any information on a output transformer-less tube POWER amplifier? Seems like it would be entirely possible to make a speaker that's REALLY high ohm, just doesn't seem like it's being produced...

Thanks for the replies (if any),
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Old 20th October 2010, 11:00 PM   #2
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Well, the obvious solution is to run a multi-driver setup with the drivers wired in series.

But there are reasons why speakers tend to be low-impedance. Beyond 16 ohms, it's hard to get enough power consumption as current is limited. To get equivalent power dissipation, output voltage has to rise to satisfy Ohm's law (P=I^2 * R).

There are tube power amps without output transformers. They typically run lots of output tubes in parallel to get the required current. Do a google search for OTL.
Peter Hansen
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Old 21st October 2010, 12:22 AM   #3
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I'm not into Amps/Transformers, for now, but this seemed very interesting to me, for being on the same subject...
"The ETF2009 shootout was a contest of single-ended output transformers."
European Triode Festival - ETF2009 Shootout
Search and Google...

Last edited by Inductor; 21st October 2010 at 12:33 AM.
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Old 21st October 2010, 12:40 AM   #4
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If you google 'high impedance speaker'...

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Old 21st October 2010, 01:13 AM   #5
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Another one.
Ceramic speaker driver amplifier design
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Old 21st October 2010, 06:38 AM   #6
el`Ol is offline el`Ol  Germany
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Philips had transformerless systems with 800 Ohm drivers. But they were not very common. Does anybody know why this wasn't done more often?
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Old 21st October 2010, 06:58 AM   #7
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the output voltage was comparatively high (danger!) and the speaker difficult to build (very thin coil windings). There are also very good reasons to build any electromagnetic winding that has to respond to very fast changes in applied voltage at as low a resistance (fewer turns of windings) as possible. More windings = more self inductive effects that slow the response of the speaker in this case
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
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Old 21st October 2010, 07:02 AM   #8
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At DC R is infinity almost.
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Old 21st October 2010, 09:15 AM   #9
gooki is offline gooki  New Zealand
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Arvus loudspeakers have some high ohm drivers. 32ohm units are common as is their 16ohm quad voice coil 8 inch woofer that allows 64ohm wiring. Note their not full range drivers though.
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