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Stax Sigma Low Bais and Stax Sigma Pros - Page 8

post #106 of 472
Thread Starter 

Stax Sigmas and a group of Stax

psycho-acoustic CDs??? While attending the International Headfi meet in San Jose last March, a certain person, who shall go nameless, demostrated a number of Stax demostration Cds that were mostly made in Germany and or had people speaking German on it. I think their were about 3 Cds in all. Is there anyone out there in Headfi land that has any information about them and or how to obtain them. Thanks for any help you can offer. Enjoy Scottsmrnyc.
post #107 of 472
Quote:
Originally Posted by Scottsmrnyc View Post
psycho-acoustic CDs??? While attending the International Headfi meet in San Jose last March, a certain person, who shall go nameless, demostrated a number of Stax demostration Cds that were mostly made in Germany and or had people speaking German on it. I think their were about 3 Cds in all. Is there anyone out there in Headfi land that has any information about them and or how to obtain them. Thanks for any help you can offer. Enjoy Scottsmrnyc.
They were binaural recordings made using a Neumann dummy head. They were only released in Europe (possibly because of copyright issues pertaining the Stax and record labels..?), but aren't hugely rare on European auction sites.
post #108 of 472
Quote:
Originally Posted by Scottsmrnyc View Post
psycho-acoustic CDs??? While attending the International Headfi meet in San Jose last March, a certain person, who shall go nameless, demostrated a number of Stax demostration Cds that were mostly made in Germany and or had people speaking German on it. I think their were about 3 Cds in all. Is there anyone out there in Headfi land that has any information about them and or how to obtain them. Thanks for any help you can offer. Enjoy Scottsmrnyc.
Like Carl said, they aren't really rare on the used market. They show just how creepy binaural can be when someone stands behind the dummy head and whispers...
post #109 of 472

Driving a Sigma

This is slightly off topic, but still Sigma Specific... what are you guys driving your Sigmas with?

I just posted a bunch of impressions of the SRD7 Pro driving my lambda's over at the Stax Thread. I'm really liking the transformers these days. Anyway, I got a second SRD-7, this time the low bias version. This unit has the AC mains generated bias.

So, I plugged my SR-Sigmas in to the SRD7 yeasterday and let them warm up a bit. I just gotta say I don't think the SRM1/MKII I've been listening to is even compatable with the Sigmas. The SRD-7 powered by my Creek 5350se really takes control of these things and makes them sing. The SRM1 just didn't have the ability to produce the incredible midrange that I now know these puppys are capable of.

It's really as if I'm listening to these things for the first time! <-- we need a Sigma smiley!
post #110 of 472
Quote:
Originally Posted by ferrstein View Post
This is slightly off topic, but still Sigma Specific... what are you guys driving your Sigmas with?

I just posted a bunch of impressions of the SRD7 Pro driving my lambda's over at the Stax Thread. I'm really liking the transformers these days. Anyway, I got a second SRD-7, this time the low bias version. This unit has the AC mains generated bias.

So, I plugged my SR-Sigmas in to the SRD7 yeasterday and let them warm up a bit. I just gotta say I don't think the SRM1/MKII I've been listening to is even compatable with the Sigmas. The SRD-7 powered by my Creek 5350se really takes control of these things and makes them sing. The SRM1 just didn't have the ability to produce the incredible midrange that I now know these puppys are capable of.

It's really as if I'm listening to these things for the first time! <-- we need a Sigma smiley!
The Sigmas need huge amounts of power to show their true colors. The transformers are the only "cheap" way of powering them since none of the Stax amps has the power for it. The Blue Hawaii transforms the SR-Sigma into a bass monster with the most impressive and taught bass this side of the Suprex PEP-74. Very, very nice!!
post #111 of 472
I'm using the same MOSFET amp I use for everything. They're powered just fine by it.
post #112 of 472
Thread Starter 
Hi Folks, I am on a road trip visiting Las Vegas. i just wanted to check in to see what was going on. I use the SRM 12S to run my Sigma Low Bias phones. It is an improvement; but not perfection. Forgive me for being dumb but, can you use amps other than Stax amps with Stax headphones??? Do you have to get a special imput adapter to plug them into such an amp??? How is this done? Scottsmrnyc
post #113 of 472
Quote:
Originally Posted by Scottsmrnyc View Post
Hi Folks, I am on a road trip visiting Las Vegas. i just wanted to check in to see what was going on. I use the SRM 12S to run my Sigma Low Bias phones. It is an improvement; but not perfection. Forgive me for being dumb but, can you use amps other than Stax amps with Stax headphones??? Do you have to get a special imput adapter to plug them into such an amp??? How is this done? Scottsmrnyc
You need an amp has high voltage and moderately low current output (or put a stepup transformer afterwards to make it so). Cone speakers need high current and moderately low voltages, so most amplifiers are designed to give that. You also need to feed a DC polarizing voltage to the diaphragm, which requires an extra circuit.
post #114 of 472
You can use a vintage Stax SRD-5, 6 or 7 adapter and hook them up to a power amp. They are just transformers to step up the voltage from the speaker amp and a bias circuit. You'll need either a SRD-7 Pro or a Mk2 if you want to use Pro bias phones or any of the other models can be modified.
post #115 of 472
Quote:
Originally Posted by spritzer View Post
The Sigmas need huge amounts of power to show their true colors. The transformers are the only "cheap" way of powering them since none of the Stax amps has the power for it. The Blue Hawaii transforms the SR-Sigma into a bass monster with the most impressive and taught bass this side of the Suprex PEP-74. Very, very nice!!
I see... one more reason to lust over a Blue Hawaii. I've been thinking about trying to DIY one of those. I actually have all the parts to do the original 6S4 based tube amp that Kevin Gilmore drew up. I did that before I found this place. I may still build that amp since I have the parts... but I think the BH would be my ultimate goal.

For now, the Creek/SRD7 combo is making my SR-Sigmas rock!
post #116 of 472
Quote:
Originally Posted by ferrstein View Post
I see... one more reason to lust over a Blue Hawaii. I've been thinking about trying to DIY one of those. I actually have all the parts to do the original 6S4 based tube amp that Kevin Gilmore drew up. I did that before I found this place. I may still build that amp since I have the parts... but I think the BH would be my ultimate goal.

For now, the Creek/SRD7 combo is making my SR-Sigmas rock!
The triode amp would be a fun project. I have a huge stockpile of tubes ready for it and a small voice inside my head whispering "Buy the Woo amp..."

I've been using the SR-Ω with my SRD-7 Mk2 for a few days and the Audio Analogue Puccini is a brilliant amp. Great combo...
post #117 of 472
Let's see how many amps we can make simultaniously.
post #118 of 472
I'm up for it. If I finish my KGSS and even build a second one (should have all the parts for it)that will increase the number...
post #119 of 472
Quote:
Originally Posted by Carl View Post
Let's see how many amps we can make simultaniously.
That'd be cool. I already have all of the expensive stuff. Bought a bunch of film caps off Ebay in the correct values, that should be a good start. Now I just need all the low voltage resistors.

Problem is, I have never built anything from scratch. I have done a whole bunch of soldering and board work, though... so I think I can handle it. Of course point-to-point wiring is new to me as well.

Quote:
Originally Posted by spritzer View Post
The triode amp would be a fun project. I have a huge stockpile of tubes ready for it..."
Me, too. I started collecting them and ended up with a 30 year supply!
post #120 of 472
Quote:
Originally Posted by ferrstein View Post
That'd be cool. I already have all of the expensive stuff. Bought a bunch of film caps off Ebay in the correct values, that should be a good start. Now I just need all the low voltage resistors.

Problem is, I have never built anything from scratch. I have done a whole bunch of soldering and board work, though... so I think I can handle it. Of course point-to-point wiring is new to me as well.
P-p requires a bit more forethought but it is otherwise pretty easy. There is always the issue of hum but if you don't cram the amp into a small box you should be fine. It's good to use a large uninsulated wire as the ground bus and connect everything to it so you are effectively star grounding. As a reference take a look at the Woo Audio site and see the internal picture of the GES. Very neat and tidy.

The casework can be pretty tedious and it really helps if you have a drill press and stepped drills for the larger holes. It's very cool when you make the case from scratch but few have the access to the necessary tools.

Quote:
Originally Posted by ferrstein View Post
Me, too. I started collecting them and ended up with a 30 year supply!
Tube collecting is a dangerous game. I'm going to buy quite a few now for my own DIY amp design, also for the SRA-7S clone Carl is working on and I need some good 6SN7's for the Egmont I'm going to build. It's good that I have all the tubes I need for the HEV90 and the Gilmore amp and I just went out and bought some components I need to finally finish my two box KGSS... and I have two Stax amps on the way.
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