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The Stax Thread III - Page 79

post #1171 of 3012

about $70 for 64 batteries

not so bad.

post #1172 of 3012

My SRD-7 SB only has a single grey cord coming our the back with terminates into four banana plugs in addition to the four binding posts on the rear of the unit.  I agree with the others about the unit scaling very well.  The background is perfectly black and the sound from both my speaker amps is lovely.  I have no desire to try the other STAX amps.

post #1173 of 3012
Where do you get your battery?
9v battery are like a few bucks each down under.
Finally understand what signal is being fed into the headphones....
It is 580vdc for bias, then small signal audio signal on top of it right?
post #1174 of 3012
Quote:
Originally Posted by rx79ez08 View Post

Where do you get your battery?
9v battery are like a few bucks each down under.
Finally understand what signal is being fed into the headphones....
It is 580vdc for bias, then small signal audio signal on top of it right?

Just some variable signal between 0 and some 300-700 volts depending on the amp... Much like normal amps, yet higher voltage.

post #1175 of 3012
Quote:
Originally Posted by davidsh View Post

Care to explain how the energiser/adapter units work without a bias supply? Takes speaker signal, ramp up the voltage with a transformer and then... What?

The stax adaptor plugs into the wall.  It converts AC current from the wall to DC 580 volts for the bias. So it does not work without a bias supply.  It IS a bias supply.

 

The stax adaptor also connects to a speaker amplifier.  The audio voltage from the amplifier is put through a step-up transformer that increases the voltage of the audio signal enough to drive the electrostatic headphones.

 

Also, the transformer roughly presents an 8 ohm load to your amplifier and matches it's output to the proper impedance to drive the headphones.

 

In the old days, Koss made some energizers which could convert some of the audio power fed into them into bias, in addition to coupling the audio from the amplifier to the electrostatic headphones, but this is not an ideal way to go.  It's better to convert AC from the power line into the DC bias-  it is more stable, etc.  Maybe some early Stax energizers developed bias from the audio input too, I do not know.  The most commonly seen Stax adapter-  SRD-7 - uses the power line to produce the bias voltage.


Edited by milosz - 12/21/13 at 5:38am
post #1176 of 3012
Quote:
Originally Posted by kevin gilmore View Post
 

about $70 for 64 batteries

not so bad.

Yeah, but where do I buy the teflon-jacketed, oxygen-free silver 9 volt battery clips?  :evil:

post #1177 of 3012
Quote:
Originally Posted by tdogzthmn View Post
 

My SRD-7 SB only has a single grey cord coming our the back with terminates into four banana plugs in addition to the four binding posts on the rear of the unit.  I agree with the others about the unit scaling very well.  The background is perfectly black and the sound from both my speaker amps is lovely.  I have no desire to try the other STAX amps.


I'm with tdogzthmn on this.7-SB with a good power amp sounds as good, sometimes better, than a Stax amp like the T1. Pity I can't get a new 7-SB anywhere.

post #1178 of 3012
Quote:
Originally Posted by milosz View Post
 

Yeah, but where do I buy the teflon-jacketed, oxygen-free silver 9 volt battery clips?  :evil:


silly person...

 

you make them.

 

preferably on a 3 axis NC mill. you have one right?

 

oxygen free silver... not for long.

post #1179 of 3012

Wallmart or Amazon may have them on special soon with NiMH batteries thrown in for free.

 

Happy waiting................

 

Actually, I like phosphor bronze battery clips more than silver.

post #1180 of 3012
Quote:
Originally Posted by kevin gilmore View Post
 


silly person...

 

you make them.

 

preferably on a 3 axis NC mill. you have one right?

 

oxygen free silver... not for long.

I do, but it's currently being rewired with Cardas cable and re-capped with Black Gates....

 

The oxygen free silver is no problem, I use high resolution oxygen free air in my listening room.

post #1181 of 3012
Quote:
Originally Posted by SquireC View Post


I'm with tdogzthmn on this.7-SB with a good power amp sounds as good, sometimes better, than a Stax amp like the T1. Pity I can't get a new 7-SB anywhere.

+1 I have the last gen of the adaptor lineup the srd-7sb mk2 and from a select few integrated amps I preferred it over the Stax amps.
post #1182 of 3012
Quote:
 
Quote:milosz
Originally Posted by kevin gilmore View Post
 


silly person...

 

you make them.

 

preferably on a 3 axis NC mill. you have one right?

 

oxygen free silver... not for long.

I do, but it's currently being rewired with Cardas cable and re-capped with Black Gates....

 

The oxygen free silver is no problem, I use high resolution oxygen free air in my listening room.

 

I see 2 major problems here:-

1/ You should be using Zu cables instead of Cardas, and Auricaps instead of Black Gates.

2/ You need titanium instead of silver cables. Beryllium is better still. The high resolution oxygen free air is problematic for continuance of life. It is strongly suggested that sulfur dioxide is substituted.

Listening to headphones is preferably conducted in a small intimate cubicle where you are not distracted form the sonic experience, and do not offend others with your insular behaviour.

post #1183 of 3012

You haven't had a great cable unless its radioactive to the touch (i.e., burn)*. That is when you know your sound is directly equal to sonic bliss and the quite present sapphire aura surrounding your head as you're listening.

 

Nothing can come close to it, not even the legendary Orpheus.

 

 

 

 

*Of course my life expectancy is quite degraded, but who cares when you have this level of sonic bliss.

post #1184 of 3012

Black Gate caps are overrated. Funny how they use to cost less than a few dollars for a pop, now whenever they do pop up on fleabay, expect to pay more than $30 for a low rating NX.

post #1185 of 3012

I have the Stax SR-507s and will get the Stax SRM-323 S.  I'm NEW at all this.  I have a late 2012 IMac 27 so will be using the "headphone out."

 

1.  Do I keep the unit on all the time or do I shut it off at the end of the day when I'm finished?

 

2.  Should I keep the volume low on my IMac when turning on the unit or would that not make a difference?

 

3.  Do I connect the RCA jacks to the left (white)  and right (red) input terminals?

 

4.  Can I keep the ear speakers continually plugged into the unit?

 

5.  If I have a damp head, can I be electrocuted when putting on the ear speakers connected to a live unit?

 

I plan on getting a DAC at a later time.

 

 

Please let me know if if would be more advantageous to post this in another section.

 

 

 

Any help would be APPRECIATED.

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