x soz - Page 79

Henrik · 11th December 2003, 11:23 AM

Hi moe29

Glad you like the xsoz.
But if you are driving it with standard bsoz two diffrent things happens.
1) Too much (IMO) x-feedback because of the higher outputimpedance in the standard bsoz.
2) If you have 10 uF at the output of your bsoz, you will be down -3db at 18Hz. You need at least 100uF, then you will be down -3db at 1.5 Hz.

If this is the case you still haven´t got the full potential from the xsoz. I have been there.

gnomus · 11th December 2003, 01:57 PM

It's a waste to to build a 20w SOZ or XSOZ. The most you should go for is 12 watts. Beyond that all you get is a lot more heat but all most no increase in volume at your speaker.

moe29 · 11th December 2003, 03:14 PM

Henrik,

Thanks for bringing that up again. I will make the modification and
report back. Maybe my initial listening impressions were biased
because it's something i built?

Is there a specific capacitor you
are using for that part? Thanks again for all your hard work in
this area!

Paul,

You are right - there is a steep curve of diminishing returns when
you are dealing with the SOZ and output power. It's easy to be
seduced by the power of the watt

Henrik · 11th December 2003, 03:46 PM

Moe29

I am using Black Gate type N at 47uF at 50V, but they need to bracke in for many hours.
But Panasonic FC with an say 1uF coupling cap should be nice too.
And then X it.
I would like to read about your expierience.

Henrik.

tomchaoda · 23rd August 2004, 10:16 PM

Quote:

The gain at the original BSOZ an SOZ was controlled by R115 and R207, now it is by R120, R121, R122, R123, and R212, R213, R214, R215, all resistors in the X-feedbackloop.
I have kept the original gainlevel, and also this gave the best frequency responce.

Henrik:

I know the formula for original bosoz's gain is 20*log(R1+R2/R15). Is the gain for x-bosoz's gain calculated in this way:

gain=20*log[R1+R2/(R120+R121)//(R122+R123)] ?

Thanks,

Thomas

Adams_Leo · 8th January 2008, 02:26 PM

Hi Henrik,
I have built soz and want to upgrade to your version xsoz and xbosoz with CCS 03 which you have posted in this thread page 18.
Here I have one question,My current SOZ work voltage at +-25V,but you post sch show 19V.Do I need change some components value to match at +-25V.

x soz

Thanks
Leo

11th December 2003, 01:57 PM	#782
gnomus diyAudio Member Join Date: Jan 2002 Location: New York City	It's a waste to to build a 20w SOZ or XSOZ. The most you should go for is 12 watts. Beyond that all you get is a lot more heat but all most no increase in volume at your speaker. __________________ Paul

11th December 2003, 03:46 PM	#784
Henrik diyAudio Member Join Date: Feb 2002 Location: Copenhagen Denmark	Moe29 I am using Black Gate type N at 47uF at 50V, but they need to bracke in for many hours. But Panasonic FC with an say 1uF coupling cap should be nice too. And then X it. I would like to read about your expierience. Henrik. __________________ Henrik

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11th December 2003, 03:14 PM	#783
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	Henrik, Thanks for bringing that up again. I will make the modification and report back. Maybe my initial listening impressions were biased because it's something i built? Is there a specific capacitor you are using for that part? Thanks again for all your hard work in this area! Paul, You are right - there is a steep curve of diminishing returns when you are dealing with the SOZ and output power. It's easy to be seduced by the power of the watt

8th January 2008, 02:26 PM	#786
Adams_Leo diyAudio Member Join Date: Apr 2003	Hi Henrik, I have built soz and want to upgrade to your version xsoz and xbosoz with CCS 03 which you have posted in this thread page 18. Here I have one question,My current SOZ work voltage at +-25V,but you post sch show 19V.Do I need change some components value to match at +-25V. x soz Thanks Leo