Speaker Impedance

sherpa · 14th March 2011, 04:03 PM

I would love to try a few of your small full range drivers but all of my hand built tube amps need 8 ohm impedance. My single ended transformers only have an 8ohm secondary. your drivers are all 4ohm as far as i can see. seems my only options are to either change output transformers or order 2 pairs and build a bi-polar speaker system. Neither of which are cost effective for me. Do any of your drivers come in 8ohm impedance?
Thanks,
Paul

my amps,
DIYTube ST-35, SE 6EM7, SE EL-84, SE KT-88

Speakers,
Zigmahornets with drivers scavenged from a Yamaha center channel speaker
or the FE-127 Fonken with FE-103 drivers.

fastvideo · 24th March 2011, 01:21 PM

Quote:

Originally Posted by sherpa

I would love to try a few of your small full range drivers but all of my hand built tube amps need 8 ohm impedance. My single ended transformers only have an 8ohm secondary. your drivers are all 4ohm as far as i can see. seems my only options are to either change output transformers or order 2 pairs and build a bi-polar speaker system. Neither of which are cost effective for me. Do any of your drivers come in 8ohm impedance?
Thanks,
Paul

my amps,
DIYTube ST-35, SE 6EM7, SE EL-84, SE KT-88

Speakers,
Zigmahornets with drivers scavenged from a Yamaha center channel speaker
or the FE-127 Fonken with FE-103 drivers.

+1

sherpa · 29th March 2011, 04:45 AM

So does anyone at Markaudio want to answer?

rcdaniel · 07:16 AM

IIRC, the Alpair 10.2 is 'rated' at 6 Ohms, though the impedance plot appears to put it generally (well) above this. That is, if the chart for the 10 on the Mark Audio site is for the 10.2...

Edit: It looks like the details for the Alpair 10 on the Mark Audio site are for the previous version. If so, I would like to see the impedance plot for the new version.

Cheers.

planet10 · 29th March 2011, 07:35 AM

CHR70.3 is likely going to be 8 ohm at user request. A12 is nominal 8 ohms. 6 ohms is close enuff to 8 to break into a sweat. Twins of the 4 ohm drivers is not a hardship (twin EL70s in a good cab stun people with their bass capabilities)

But one needs to remember that impedances are nominal. They do not look like a straight line at all.

I just measured 10 Alpair10.2, I'll run downstairs and generate a postible curve.

dave

planet10 · 29th March 2011, 08:24 AM

A typical curve from a set of 10 drivers. This would be called an 8 ohm driver. Note that over most of the range it is >8 ohms.

dave

sherpa · 29th March 2011, 04:37 PM

Thank you, I would love to do a bi-polar speaker but the extra cost would be hard to justify to the wife.

14th March 2011, 04:03 PM	#1
sherpa diyAudio Member Join Date: Jan 2010 Location: Spokane WA	Speaker Impedance I would love to try a few of your small full range drivers but all of my hand built tube amps need 8 ohm impedance. My single ended transformers only have an 8ohm secondary. your drivers are all 4ohm as far as i can see. seems my only options are to either change output transformers or order 2 pairs and build a bi-polar speaker system. Neither of which are cost effective for me. Do any of your drivers come in 8ohm impedance? Thanks, Paul my amps, DIYTube ST-35, SE 6EM7, SE EL-84, SE KT-88 Speakers, Zigmahornets with drivers scavenged from a Yamaha center channel speaker or the FE-127 Fonken with FE-103 drivers.

29th March 2011, 07:00 AM	#4
rcdaniel diyAudio Member Join Date: Nov 2002 Location: BrisVegas	IIRC, the Alpair 10.2 is 'rated' at 6 Ohms, though the impedance plot appears to put it generally (well) above this. That is, if the chart for the 10 on the Mark Audio site is for the 10.2... Edit: It looks like the details for the Alpair 10 on the Mark Audio site are for the previous version. If so, I would like to see the impedance plot for the new version. Cheers. __________________ “We must have concepts in order to function; they are not the problem. The problem is created when we believe they are the truth.” Charlotte Joko Beck Last edited by rcdaniel; 29th March 2011 at 07:16 AM.

29th March 2011, 07:35 AM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	CHR70.3 is likely going to be 8 ohm at user request. A12 is nominal 8 ohms. 6 ohms is close enuff to 8 to break into a sweat. Twins of the 4 ohm drivers is not a hardship (twin EL70s in a good cab stun people with their bass capabilities) But one needs to remember that impedances are nominal. They do not look like a straight line at all. I just measured 10 Alpair10.2, I'll run downstairs and generate a postible curve. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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29th March 2011, 04:45 AM	#3
sherpa diyAudio Member Join Date: Jan 2010 Location: Spokane WA	So does anyone at Markaudio want to answer?

29th March 2011, 04:37 PM	#7
sherpa diyAudio Member Join Date: Jan 2010 Location: Spokane WA	Thank you, I would love to do a bi-polar speaker but the extra cost would be hard to justify to the wife.

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