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Stax Sigma Low Bais and Stax Sigma Pros - Page 25

post #361 of 472
Quote:
Originally Posted by chi2 View Post
I got a pair of original Sigmas (low bias) in very good state today. What I like most about them is the looks . Honestly, I'm a bit underwhelmed. I was prepared for recessed highs and limited dynamics. I also knew that I couldn't count on deep bass, but the missing of pretty much anything below maybe 70 Hz is hard to take - despite the beautiful mids and the new kind of soundstage. Even plan b is at risk as I fear that the problem with bass persists when transforming the phones into Sigma/303's. Has anyone had success in experimenting with different types of damping material in order to improve low bass response?
Wha? My SR-Sigmas have the best bass of all of my Stax. They don't go to 20Hz but 30 Hz they do without a problem and have great bass impact. Whenever I read something like this I question my ears and sanity, put my Sigmas on and question the ears and sanity of whoever posted the comment
post #362 of 472
Quote:
Originally Posted by spritzer View Post
What are you driving them with? The amp is the biggest factor here as they need a lot of juice to shine. You could try some other damping materials but avoiding reflections will be tough as most foam materials will bounce some of the sound back.

Another option is that your set isn't up to spec no matter how good they look. The glue that holds the damping material is most likely gone so sound will leak and that kills the bass.
Well according to his signature he has: SRM-1MKII; SRM-212; SRM-717, SRM-T1. So it must be one of these. If the bass does not go below 70Hz I say his Sigma is broken.
post #363 of 472
SRM-1/MK2, the potentiometer being in the 3 to 4 o'clock position! The damping material (cotton?) is in position, but it seems to have a very low mass and density, too. Maybe a thin layer of sponge rubber placed under the cotton would help. Problem may be placing back the cotton after having taken it out.
post #364 of 472
Quote:
Originally Posted by Faust2D View Post
If the bass does not go below 70Hz I say his Sigma is broken.
No distortions over the frequency spectrum, very nice detail in the mids, suprisingly they even have good attack (in the mids, that is - I'm listening to Michael Hedges' Aerial Boundaries right now). They just lack very low and low bass.
post #365 of 472
Quote:
Originally Posted by chi2 View Post
SRM-1/MK2, the potentiometer being in the 3 to 4 o'clock position! The damping material (cotton?) is in position, but it seems to have a very low mass and density, too. Maybe a thin layer of sponge rubber placed under the cotton would help. Problem may be placing back the cotton after having taken it out.
The damping material is mineral wool and it is cut and glued into this shape so it is easy to remove it and put back. That doesn't mean it isn't extremely fragile!! The glue I was talking about holds the damping material to the structure which and that is most likely done for. ESP's need very little damping so a 4mm thick layer of this stuff totally changes the SR-Lambdas character...

The position of the volume knob should be a bit higher then if you were using a Lambda but no more then 1-1.5 on the volume scale. If it is any more then that then the odds are the drivers have arced badly and there are large holes in the diaphragm. The structure could also be loose or the drivers loose from the baffle so check all screws (also the holes which hold the headband since they are screws) and check all the panels on the structure since they are just glued in.
post #366 of 472
Quote:
Originally Posted by chi2 View Post
SRM-1/MK2, the potentiometer being in the 3 to 4 o'clock position! The damping material (cotton?) is in position, but it seems to have a very low mass and density, too. Maybe a thin layer of sponge rubber placed under the cotton would help. Problem may be placing back the cotton after having taken it out.
I use mine with SRM-1Mk2 at 1 pm at the most, never above 2-3 pm and at 3 pm it's painfully loud.
post #367 of 472
Quote:
Originally Posted by spritzer View Post
The position of the volume knob should be a bit higher then if you were using a Lambda but no more then 1-1.5 on the volume scale.
The knob position on the SRM-1/MK2 relative to the one needed for the 202 to reach identical volume is about 1.5 "hours" higher.

Quote:
Originally Posted by spritzer View Post
If it is any more then that then the odds are the drivers have arced badly and there are large holes in the diaphragm. The structure could also be loose or the drivers loose from the baffle so check all screws (also the holes which hold the headband since they are screws) and check all the panels on the structure since they are just glued in.
AfaIcs the diaphragms look intact, the screws sat pretty tight - only about 5 degrees to go.
post #368 of 472
Using a set of test-tones I found the Sigmas to transmit frequencies as low as 35 Hz but these are very recessed. Volume continuously increases and reaches a normal level only at about 80 to 90 Hz.
post #369 of 472
Quote:
Originally Posted by chi2 View Post
The knob position on the SRM-1/MK2 relative to the one needed for the 202 to reach identical volume is about 1.5 "hours" higher.
That sounds about right.

Quote:
Originally Posted by chi2 View Post
AfaIcs the diaphragms look intact, the screws sat pretty tight - only about 5 degrees to go.
There is no way for you to know if the diaphragms are intact without ripping the drivers apart. All you can see from the outside are the dust covers. Do you know if this particular set was used with a Stax amp or adapter?
post #370 of 472
Thanks for the input so far. These Sigmas were exclusively used with an SRM-1/MK2 normal bias. Why does amp vs. adapter matter with regard to a possible destruction of the diaphragm?
post #371 of 472
Quote:
Originally Posted by chi2 View Post
Thanks for the input so far. These Sigmas were exclusively used with an SRM-1/MK2 normal bias. Why does amp vs. adapter matter with regard to a possible destruction of the diaphragm?
The amps can't swing enough voltage to arc the diaphragm but the adapters are just transformers so they will step up everything they are fed by 25. That could arc them easily...
post #372 of 472
Thread Starter 
Just saying hello to everyone. It has been a long time. I still love my Stax Sigma Pros
post #373 of 472
Thread Starter 
I recently picked up a SRD X Pro Portable Power Pack and Adapter. I had to have a second one as a backup unit. It really works great with all the Stax Pro Headphones. I haven't tried it with the non pro Stax Headphones though! I might bring the unit and my 4070s to CanJam 2009 in LA.

I hope everyone is doing well. Scottsmrnyc
post #374 of 472
Quote:
Originally Posted by Scottsmrnyc View Post
I recently picked up a SRD X Pro Portable Power Pack and Adapter. I had to have a second one as a backup unit. It really works great with all the Stax Pro Headphones. I haven't tried it with the non pro Stax Headphones though! I might bring the unit and my 4070s to CanJam 2009 in LA.

I hope everyone is doing well. Scottsmrnyc
Nice score - I was looking for one for a long while unsuccessfully, but now with my modded SR-001 I don't need portable full size options as much. I actually had a Koss E90 with battery pack and stax adapter for months and never needed it so I traded my whole Koss rig for a nicer DAC. My Travgans Red with SRD-7 Mk2 is small enough to travel with is I want full size stats with me, although it would be nice if the amp and SRD were in the same enclosure that was smaller.
post #375 of 472
Damnit, I want a SR-X pro...
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