SOZ 4 ohm load

cjunk · 13th March 2002, 09:27 AM

I am just about to finish a loudspeakers project
with a pair 8 ohm drivers for each channel to be connected in parallel.
I would like to use them with a 10 W SOZ that I plan to build very soon.
Will the SOZ be happy with a 4 ohm load?

hifi · 13th March 2002, 02:33 PM

i think it would be better to wire them in series and re caluclate some of the resistors for a 16ohm load that would make the soz more effecitve

hifi · 13th March 2002, 02:40 PM

i think it would be better to wire them in series and re caluclate some of the resistors for a 16ohm load that would make the soz more effecitve

Nelson Pass · 13th March 2002, 04:52 PM

Two other alternatives:

Two SOZ's in parallel (or)

Replace all the power resistors with 1/2 the
original value and lower the supply rails by
30%.

yasalam · 14th March 2002, 03:44 AM

What would happen if SOZ is loaded with 4 ohm speaker impedance??

gnomus · 14th March 2002, 06:26 AM

I have a pair of variable power output SOZ mono blocks driving large three way 4 ohm 87 dB efficiency dynamic speakers. Ten watts is just barely enough. On big orchestral climaxes or other very demanding spikes in music with the volume turn up the sound would compress or in a worst case situation the midrange cone would start to break up a little. At 15 to 20 watts the problems went away. In fact you think your listening to much larger amps.

cjunk · 14th March 2002, 10:05 AM

Thank you all for your answers.

I appreciate Mr. Pass suggestion to half
the power resistors, this would imply
4 omhs for R1-R4 and 0.5 ohms for R5-R7.

I already acquired two 500 VA toroids with
20V secondaries, may be I get too high
voltage rails to match the suggested reduction
by 30%?

I would like to use anyway those toroids, is
any other adjustment that can be performed
maintaining the supply to about 25V for 10W
output?

Nelson Pass · 14th March 2002, 07:23 PM

Using a Variac is the best way to play with the
SOZ voltages. Then you can get what you want
until it gets too hot

13th March 2002, 09:27 AM	#1
cjunk diyAudio Member Join Date: Oct 2001 Location: Roma, Italy	SOZ 4 ohm load I am just about to finish a loudspeakers project with a pair 8 ohm drivers for each channel to be connected in parallel. I would like to use them with a 10 W SOZ that I plan to build very soon. Will the SOZ be happy with a 4 ohm load?

14th March 2002, 06:26 AM	#6
gnomus diyAudio Member Join Date: Jan 2002 Location: New York City	SOZ and 4 Ohm speakers I have a pair of variable power output SOZ mono blocks driving large three way 4 ohm 87 dB efficiency dynamic speakers. Ten watts is just barely enough. On big orchestral climaxes or other very demanding spikes in music with the volume turn up the sound would compress or in a worst case situation the midrange cone would start to break up a little. At 15 to 20 watts the problems went away. In fact you think your listening to much larger amps. __________________ Paul

14th March 2002, 10:05 AM	#7
cjunk diyAudio Member Join Date: Oct 2001 Location: Roma, Italy	more questions Thank you all for your answers. I appreciate Mr. Pass suggestion to half the power resistors, this would imply 4 omhs for R1-R4 and 0.5 ohms for R5-R7. I already acquired two 500 VA toroids with 20V secondaries, may be I get too high voltage rails to match the suggested reduction by 30%? I would like to use anyway those toroids, is any other adjustment that can be performed maintaining the supply to about 25V for 10W output?

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13th March 2002, 02:33 PM	#2
hifi diyAudio Member Join Date: Mar 2001 Location: sweden	i think it would be better to wire them in series and re caluclate some of the resistors for a 16ohm load that would make the soz more effecitve

13th March 2002, 02:40 PM	#3
hifi diyAudio Member Join Date: Mar 2001 Location: sweden	i think it would be better to wire them in series and re caluclate some of the resistors for a 16ohm load that would make the soz more effecitve

13th March 2002, 04:52 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Two other alternatives: Two SOZ's in parallel (or) Replace all the power resistors with 1/2 the original value and lower the supply rails by 30%.

14th March 2002, 03:44 AM	#5
yasalam diyAudio Member Join Date: Mar 2002 Location: Indonesia	What would happen if SOZ is loaded with 4 ohm speaker impedance??

14th March 2002, 07:23 PM	#8
Nelson Pass The one and only Join Date: Mar 2001	Using a Variac is the best way to play with the SOZ voltages. Then you can get what you want until it gets too hot

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