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Old 13th March 2002, 09:27 AM   #1
cjunk is offline cjunk  Italy
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Default 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?
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Old 13th March 2002, 02:33 PM   #2
hifi is offline hifi  Sweden
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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
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Old 13th March 2002, 02:40 PM   #3
hifi is offline hifi  Sweden
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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
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Old 13th March 2002, 04:52 PM   #4
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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%.
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Old 14th March 2002, 03:44 AM   #5
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What would happen if SOZ is loaded with 4 ohm speaker impedance??
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Old 14th March 2002, 06:26 AM   #6
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Default 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.
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Old 14th March 2002, 10:05 AM   #7
cjunk is offline cjunk  Italy
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Default 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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Old 14th March 2002, 07:23 PM   #8
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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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