out put toroids for hard speaker loads

slr 5000 · 2nd June 2010, 01:17 AM

hi all
a while ago i found a site that sells toroid transformers that you simply install in your speaker cables in between the amp and speakers which makes the amp see a different load so even though your speakers may be 4ohm your amp will see a 8ohm load

i cant seem to find them any more on the net and am hoping some one here knows this product and the website where i can buy them

cheers

janneman · 2nd June 2010, 07:58 AM

Quote:

Originally Posted by slr 5000

hi all
a while ago i found a site that sells toroid transformers that you simply install in your speaker cables in between the amp and speakers which makes the amp see a different load so even though your speakers may be 4ohm your amp will see a 8ohm load

i cant seem to find them any more on the net and am hoping some one here knows this product and the website where i can buy them

cheers

There was an article in AX a few years ago about this, I'll try to find it.

jd

C37 · 2nd June 2010, 09:18 AM

There was a review of this on TNT audio. probably what you are looking for ( link to manufacturer on page)

Cheers,

slr 5000 · 2nd June 2010, 09:23 AM

many thanks to jd and c37
that is exactly what i was after except for the price $700 for 2 toroids blaaah!

now how to diy ,they do not look to complicated hmmm

defect9 · 2nd June 2010, 10:01 AM

I'm still sometimes a noob so correct me if I'm wrong, but isn't it possible to increase the impedence an amp sees by paralleling a resistor of sufficient watt-handling capacity with the speaker load?

Mooly · 2nd June 2010, 10:47 AM

Quote:

Originally Posted by defect9

I'm still sometimes a noob so correct me if I'm wrong, but isn't it possible to increase the impedence an amp sees by paralleling a resistor of sufficient watt-handling capacity with the speaker load?

In series with, not in parallel

unclejed613 · 01:22 PM

is this for a class AB amp? don't waste your money... the only time something like this makes sense is with a tube amp or a SS amp with an output transformer, or a class A. you could easily "roll your own" anyway and save about $680.00.

the output impedance of most modern amps is well below 0.1 ohm, so using an impedance matching transformer doesn't make any sense. the device in question looks suspiciously like a standard toroid power transformer anyway, probably using the center tapped secondary as an autotransformer.

slr 5000 · 3rd June 2010, 12:03 AM

i am curious about this product as i am using aleph 2 se amps to drive esl speakers and am about to convert them to aleph j

with the aleph j amps the distortion into 4 ohm loads is higher than 8 ohm
they also dont double their power into 4 or 2 ohms so the above product would help a lot for my setup

cheers

mickeymoose · 3rd June 2010, 12:15 AM

Plitron (PLITRON - audio transformers - toroidal transformers - toroids - output transformers - current transformers - power transformers - medical isolation transformers - power toroids) comes to mind. E

mickeymoose · 3rd June 2010, 12:20 AM

EV, Altec and Rauland had EI-core matching transformers. As I recall the EV was called AT100 (for autotransformer 100W). E

2nd June 2010, 01:17 AM	#1
slr 5000 diyAudio Member Join Date: Oct 2007 Location: melbourne	out put toroids for hard speaker loads hi all a while ago i found a site that sells toroid transformers that you simply install in your speaker cables in between the amp and speakers which makes the amp see a different load so even though your speakers may be 4ohm your amp will see a 8ohm load i cant seem to find them any more on the net and am hoping some one here knows this product and the website where i can buy them cheers

2nd June 2010, 01:19 PM	#7
unclejed613 diyAudio Member Join Date: Dec 2006	is this for a class AB amp? don't waste your money... the only time something like this makes sense is with a tube amp or a SS amp with an output transformer, or a class A. you could easily "roll your own" anyway and save about $680.00. the output impedance of most modern amps is well below 0.1 ohm, so using an impedance matching transformer doesn't make any sense. the device in question looks suspiciously like a standard toroid power transformer anyway, probably using the center tapped secondary as an autotransformer. Last edited by unclejed613; 2nd June 2010 at 01:22 PM.

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2nd June 2010, 09:18 AM	#3
C37 diyAudio Member Join Date: Mar 2003 Location: Brussels	There was a review of this on TNT audio. probably what you are looking for ( link to manufacturer on page) Cheers,

2nd June 2010, 09:23 AM	#4
slr 5000 diyAudio Member Join Date: Oct 2007 Location: melbourne	many thanks to jd and c37 that is exactly what i was after except for the price $700 for 2 toroids blaaah! now how to diy ,they do not look to complicated hmmm

2nd June 2010, 10:01 AM	#5
defect9 diyAudio Member Join Date: Sep 2007 Location: Carson City, NV	I'm still sometimes a noob so correct me if I'm wrong, but isn't it possible to increase the impedence an amp sees by paralleling a resistor of sufficient watt-handling capacity with the speaker load?

3rd June 2010, 12:03 AM	#8
slr 5000 diyAudio Member Join Date: Oct 2007 Location: melbourne	i am curious about this product as i am using aleph 2 se amps to drive esl speakers and am about to convert them to aleph j with the aleph j amps the distortion into 4 ohm loads is higher than 8 ohm they also dont double their power into 4 or 2 ohms so the above product would help a lot for my setup cheers

3rd June 2010, 12:15 AM	#9
mickeymoose diyAudio Member Join Date: Nov 2008	Plitron (PLITRON - audio transformers - toroidal transformers - toroids - output transformers - current transformers - power transformers - medical isolation transformers - power toroids) comes to mind. E

3rd June 2010, 12:20 AM	#10
mickeymoose diyAudio Member Join Date: Nov 2008	EV, Altec and Rauland had EI-core matching transformers. As I recall the EV was called AT100 (for autotransformer 100W). E

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