Hi,
I have a couple of easy(maybe?) questions reguarding my first DIY-projects. After reading a lot of posts here I've decided to go forward and create a unbalanced version of BOZOZ (http://2bak.homepage.dk/mybosoz.gif) and a ZV4 to go with it.
So here goes:
1) If Un-BOSOZ is built in accordance to the link above, no phase shift is induced, the ZV4 on the other hand seems to have 180deg. phase shift. I have a vauge memory of Mr.Pass saying that absolute phase is desirable... I can't se that this would be a problem, what are your thoughts?
2) Would the use of a single (as opposed to two 30VA) 160 VA toroidal transf. (2x30V) in BOSOZ degrade its sonic performance?
3) After examination of the pictures of several projects both here and in the Pass gallery I get the impression that star grounding isn't nessaccary. Many seem to use a single sheet (bar) of copper/brass as common ground. Won't every capacitor (in the powersupply) "see" a different potential to ground?
4) Since microvibrations will translate to noise in components, has anyone contemplated the use of rubber suspention of pcbs?
\_____/
| |
| PCB |
|_____|
/ \ <- rubber
Hope someone can give some feedback. It would be much appreciated! 😉
Sinceley yours,
Niclas
I have a couple of easy(maybe?) questions reguarding my first DIY-projects. After reading a lot of posts here I've decided to go forward and create a unbalanced version of BOZOZ (http://2bak.homepage.dk/mybosoz.gif) and a ZV4 to go with it.
So here goes:
1) If Un-BOSOZ is built in accordance to the link above, no phase shift is induced, the ZV4 on the other hand seems to have 180deg. phase shift. I have a vauge memory of Mr.Pass saying that absolute phase is desirable... I can't se that this would be a problem, what are your thoughts?
2) Would the use of a single (as opposed to two 30VA) 160 VA toroidal transf. (2x30V) in BOSOZ degrade its sonic performance?
3) After examination of the pictures of several projects both here and in the Pass gallery I get the impression that star grounding isn't nessaccary. Many seem to use a single sheet (bar) of copper/brass as common ground. Won't every capacitor (in the powersupply) "see" a different potential to ground?
4) Since microvibrations will translate to noise in components, has anyone contemplated the use of rubber suspention of pcbs?
\_____/
| |
| PCB |
|_____|
/ \ <- rubber
Hope someone can give some feedback. It would be much appreciated! 😉
Sinceley yours,
Niclas
I'm using BOSOZ with Zen V4 right now. Maybe I could share some thought.
1) I didn't experience anything bad about this.
2) I use a 80VA toroid and seems OK. 160VA should be more than enough but I don't how it affect the sound
3) I didn't use star ground in both of them.
4) That's a good idea, let me know your finding if you go for it.
😎
Wallace
P.S. I would go for an Aleph 5 if I start over again since my speaker is not that efficient. Building cost is more or less the same.
1) I didn't experience anything bad about this.
2) I use a 80VA toroid and seems OK. 160VA should be more than enough but I don't how it affect the sound
3) I didn't use star ground in both of them.
4) That's a good idea, let me know your finding if you go for it.
😎
Wallace
P.S. I would go for an Aleph 5 if I start over again since my speaker is not that efficient. Building cost is more or less the same.
Zen IV and phase reversal
The speaker connections on the Zen IV are specified as Spkr + to ground on the amp, Spkr - to the active output. That's why in the Nelson Pass article the ground on the amp is labeled +.
That takes care of the inverting nature of the amp and maintains the absolute phase of the signal through the amplifier.
The speaker connections on the Zen IV are specified as Spkr + to ground on the amp, Spkr - to the active output. That's why in the Nelson Pass article the ground on the amp is labeled +.
That takes care of the inverting nature of the amp and maintains the absolute phase of the signal through the amplifier.
wchick:
Thanks for the advice! I was contemplating the Aleph5 as well but settled on the ZV4 because it seemed simpler... Maybe I will regret it to as my speakers are not too efficient. Maybe the ZV4 will end up driving my tweeter! 😉
I'll let you know (by posting on this forum) whether the rubber suspention was a good idea or not. But I gather it will be impossible to tell one way or the other, as with all tweaks!
vpharris:
Ah. That makes sence. Please bear with my stupidity for I admit not to have fully understood the difference reguarding the output location (how the output is tapped) of the Bride of Zen and ZV4. In Mr.Pass "The Bride of Zen" article he says: "Using the zen preamp usually requires that we adjust the phase of connection between amplifier and loudspeaker for phase integrity." Why can we say the ground is the + in the ZV4 case and not in the Bride of Zen case?
Thanks for the advice! I was contemplating the Aleph5 as well but settled on the ZV4 because it seemed simpler... Maybe I will regret it to as my speakers are not too efficient. Maybe the ZV4 will end up driving my tweeter! 😉
I'll let you know (by posting on this forum) whether the rubber suspention was a good idea or not. But I gather it will be impossible to tell one way or the other, as with all tweaks!
vpharris:
Ah. That makes sence. Please bear with my stupidity for I admit not to have fully understood the difference reguarding the output location (how the output is tapped) of the Bride of Zen and ZV4. In Mr.Pass "The Bride of Zen" article he says: "Using the zen preamp usually requires that we adjust the phase of connection between amplifier and loudspeaker for phase integrity." Why can we say the ground is the + in the ZV4 case and not in the Bride of Zen case?
Becouse "Bride of Zen" is not going to drive a loudspeaker, but
usually another amplifier.
The ground of "BOZ" is to be the same in the follow amplifier.
As to say is not possible put the signal into ground.
The speaker do not impose this limitation.
usually another amplifier.
The ground of "BOZ" is to be the same in the follow amplifier.
As to say is not possible put the signal into ground.
The speaker do not impose this limitation.
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