What is the highest ohm speaker?

nige838 · 20th October 2010, 09:54 PM

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),
Nick

bunkie · 20th October 2010, 11:00 PM

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.

Inductor · 12:33 AM

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...
http://www.electronics-related.com/u...ow/95954-1.php

wakibaki · 21st October 2010, 12:40 AM

If you google 'high impedance speaker'...

w

Inductor · 21st October 2010, 01:13 AM

Another one.
Ceramic speaker driver amplifier design

el`Ol · 21st October 2010, 06:38 AM

Philips had transformerless systems with 800 Ohm drivers. But they were not very common. Does anybody know why this wasn't done more often?

aardvarkash10 · 21st October 2010, 06:58 AM

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

suntechnik · 21st October 2010, 07:02 AM

ELECTROSTATIC

At DC R is infinity almost.

gooki · 21st October 2010, 09:15 AM

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.

20th October 2010, 09:54 PM	#1
nige838 diyAudio Member Join Date: Dec 2009	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), Nick

20th October 2010, 11:00 PM	#2
bunkie diyAudio Member Join Date: Sep 2002 Location: New York city	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 www.audio.thesonicboomers.com

21st October 2010, 12:22 AM	#3
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	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... http://www.electronics-related.com/u...ow/95954-1.php __________________ NEXT-proaudio Portugal William Ralston Music Listening Library Last edited by Inductor; 21st October 2010 at 12:33 AM.

21st October 2010, 01:13 AM	#5
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	Another one. Ceramic speaker driver amplifier design __________________ NEXT-proaudio Portugal William Ralston Music Listening Library

21st October 2010, 06:58 AM	#7
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	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 __________________ "Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report


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21st October 2010, 12:40 AM	#4
wakibaki Banned Join Date: Jan 2008 Blog Entries: 2	If you google 'high impedance speaker'... w

21st October 2010, 06:38 AM	#6
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Philips had transformerless systems with 800 Ohm drivers. But they were not very common. Does anybody know why this wasn't done more often?

21st October 2010, 07:02 AM	#8
suntechnik diyAudio Member Join Date: Jun 2010 Location: St. Petersburg	ELECTROSTATIC At DC R is infinity almost.

21st October 2010, 09:15 AM	#9
gooki diyAudio Member Join Date: Dec 2008	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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