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The Entry Level Stax Thread - Page 72

post #1066 of 1072
Thread Starter 
Quote:
Originally Posted by JUSTINDTH View Post
 

Thank you for the posting link.

 

Another question I have is about the amplifier. Can I use this http://www.kingrex.co.uk/leadacid_battery.html instead of the wall wart with the SRM-252S?

 

You can, but you should use an intelligent Lithium battery pack.

For example:

http://www.ankaka.com/incredible-20000mah-battery-charger-universal-portable-battery_p409.html

 

The battery should should cut off power before it gets too low, to protect the battery from over-discharging, protect the battery from getting too low..

post #1067 of 1072

Is there any difference beetween SR-202 and SR-207 ? :confused:

Please do NOT answer "five units" :ph34r:

 

Ali

post #1068 of 1072
Quote:
Originally Posted by Ali-Pacha View Post

Is there any difference beetween SR-202 and SR-207 ? confused.gif
Please do NOT answer "five units" ph34r.gif
Ali
I've tried the stock SR-207 vs the SR-202 with leather pads on the SRM-252S and I found the SR-202 to sound smoother and the bass had more extension. I'm not sure if it was the leather pads making a difference though since the SR-207's stock plastic leather doesn't quite get a good seal on my head.
post #1069 of 1072
Thread Starter 
Quote:
Originally Posted by miceblue View Post

I've tried the stock SR-207 vs the SR-202 with leather pads on the SRM-252S and I found the SR-202 to sound smoother and the bass had more extension. I'm not sure if it was the leather pads making a difference though since the SR-207's stock plastic leather doesn't quite get a good seal on my head.

Oh man, I'm going to have to get me some of those leather pads!
post #1070 of 1072

A little bump with a question. At some points we discussed amps, slew rate and connecting more than 1 earspeaker to the Stax amplifiers.

 

  1. Why should it be a problem driving, say, 3 earspeakers at once (I don't quite get it, the current should be pretty darn low anyway, even at 20 kHz)?
  2. I remember slew rates being thrown around - something like 60-70 V/ms. That's pretty low, I mean that'd make the amp unable to produce more than 3-3.5V p-p 20k hz tones, which makes no sense?

 

I hope someone has the answers.. Thanks :) 

 

EDIT: I figured we were talking microseconds. So that'd be more like 3000-3500 V p-p for a 20k Hz tone. Still, if anyone can shed some light on question 1 and perhaps elaborate to 2?


Edited by davidsh - 4/17/14 at 3:43pm
post #1071 of 1072
Thread Starter 
Quote:
Originally Posted by davidsh View Post
 

A little bump with a question. At some points we discussed amps, slew rate and connecting more than 1 earspeaker to the Stax amplifiers.

 

  1. Why should it be a problem driving, say, 3 earspeakers at once (I don't quite get it, the current should be pretty darn low anyway, even at 20 kHz)?
  2. I remember slew rates being thrown around - something like 60-70 V/ms. That's pretty low, I mean that'd make the amp unable to produce more than 3-3.5V p-p 20k hz tones, which makes no sense?

 

I hope someone has the answers.. Thanks :) 

 

EDIT: I figured we were talking microseconds. So that'd be more like 3000-3500 V p-p for a 20k Hz tone. Still, if anyone can shed some light on question 1 and perhaps elaborate to 2?

 

Yes, we are talking about microseconds.

You are correct, 60-70 Volts per microsecond is quite a bit for a bandwidth of 20 kHz.

 

Not too sure if the Stax amps are designed to drive 3 earspeakers.  Anybody?

post #1072 of 1072
Quote:
Originally Posted by Chris J View Post
 

 

Not too sure if the Stax amps are designed to drive 3 earspeakers.  Anybody?

A few of us had a mini stax meet a couple weekends ago and ran three pro bias stax (202, 207, 404) through an srm-006t and it drove them all pretty decently at the same time.


Also, in case anyone else was looking for a case for their STAX Lambdas, the Pelican 1200 case fits, but it's quite a tight fit:

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