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To BOSOZ or not to BOSOZ... please comment.
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Old 22nd December 2004, 05:16 PM   #1
spence is offline spence  United States
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Join Date: Jan 2004
Location: New Jersey
Default To BOSOZ or not to BOSOZ... please comment.

Thanks all in advance for your valuable input...

I currently have a less than optimal setup- running my SACD (I only use stereo) through a Harmon Kardon Home Theater amp's pre-amp outputs into my power amp - basically using the HK as a volume control. I would like to eliminate the HK using one of the following options:

1. Build BOSOZ

2. Build stepped attenuator

Question is... do you think that the SACD can drive my amp sufficiently, or would the BOSOZ yield significant improvemnet because of the capacitive load of the power amp??

Or, does anybody have a better idea that I have not considered.

System Specs:

Sony SACD 222ES - output 2.0 V p-p 10kOhms

Power Amp:
B&K ST 125.2 - input impedance 33.2K Ohms
Mods... first mods I've ever done.
-Solen 10uF input caps (replacing electrolytics)
-More higher capacitance and more filtering in powersupply

Thanks for the help!

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Old 22nd December 2004, 06:21 PM   #2
hifimaker is offline hifimaker  United States
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Join Date: Oct 2003
Location: San Jose
Hello Spence,

This is probably a bit subjective. I personally like the BOSOZ between a CD source and the amp. My own experiences have been that the BOSOZ smooths the harshness of digital sources while providing attenuation.

I have a Marantz CD63SE with an Adcom GDA700 DAC. Directly connecting the CD player and then the DAC directly to the amp worked well, but I greatly preferred the BOSOZ between the source and the amp.

The Bosoz is not expensive to build and can easily be built using point to point wiring. I used NO exotic components except for "Wonder wire" from http://www.PercyAudio.com. Also used a single transformer for both channels. 160VA Y236506 or 120VA Y236457, the 160VA is overkill. http://www.avellindberg.com/transfor...ange_specs.htm

Good luck,

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Old 24th December 2004, 07:50 PM   #3
steenoe is offline steenoe  Denmark
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Join Date: Mar 2004
1. Build BOSOZ
Go for that! I am sure you won't be disappointed.
I was running a passive attenuator before, but after connecting
the Bosoz there is no turning back
The sound is really sweet! I guess it is the "PASS magic" thing

Merry Christmas

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Old 24th February 2012, 07:52 PM   #4
Bonfils is offline Bonfils
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Join Date: Dec 2010
Default Adcom GDA 700

Good afternoon,
I just purchase an Adcom GDA700, but can't seem to be able to connect correctly
Would someone be able to walk me thru????
Cheers JP
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Old 27th February 2012, 02:57 AM   #5
qusp is offline qusp  Australia
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Join Date: Oct 2009
Location: Brisbane, Australia
what? you might get better advice and a wider audience to solve your problem if you posted somewhere more appropriate; rather than bumping an 8 year old thread that wasnt even about the adcom back then
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