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Author Topic: STAX SR-009 Frequency Response  (Read 14620 times)

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n3rdling

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Re: STAX SR-009 Frequency Response
« Reply #10 on: November 04, 2013, 04:25:39 PM »
Ya I'm certain your measurements are wrong.  This makes it look like the 009's have less treble than the LCD2.1
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ultrabike

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Re: STAX SR-009 Frequency Response
« Reply #11 on: November 04, 2013, 04:30:45 PM »
Quote from: shipsupt on November 04, 2013, 04:04:02 PM
Are you going to post the Lambda measurements?

I'll post the Lambda's in a minute.

Quote from: n3rdling on November 04, 2013, 04:25:39 PM
Ya I'm certain your measurements are wrong.  This makes it look like the 009's have less treble than the LCD2.1

Possible. From mids to treble they don't look that different to me from the IF results though:

http://www.innerfidelity.com/images/StaxSR009.pdf
http://www.innerfidelity.com/images/StaxSR009SZ91278.pdf
http://www.innerfidelity.com/images/StaxSR009SZ91278afterburnin.pdf

A rigid plate measurement would extend the bass, but if I do that to all open headphones they would appear as bass monsters. Probably should have measured with rigid plate given seal is critical to these as with closed headphones.

I think the seal problem is possible. For the Lambdas someone pushing slightly the cans to the pads (EDIT: those probably should have been measured with rigid plate as well).

Here are the results for the FR with no smoothing:



Unfortunately, I don't have current access to electrostatics cans/amps right now to attempt another set of measurements.
« Last Edit: November 04, 2013, 06:37:12 PM by ultrabike »
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ultrabike

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Re: STAX SR-009 Frequency Response
« Reply #12 on: November 04, 2013, 05:54:17 PM »
The fact that these use sealed pads and seem to require good seal to get the bass out suggests that I should have used the rigid baffle approach I use for closed cans.
« Last Edit: November 04, 2013, 06:57:50 PM by ultrabike »
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kiteki

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Re: STAX SR-009 Frequency Response
« Reply #13 on: November 04, 2013, 08:09:10 PM »
So the IR at 5kHz is around 0.5ms, that's pretty fast right?
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ultrabike

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Re: STAX SR-009 Frequency Response
« Reply #14 on: November 04, 2013, 08:12:43 PM »
Well, to me CSD cleanness means there are not phase and ringing weirdness going on.

I usually think of speed in the context of BW. A very short impulse response would correspond to fairly large BW. However, all of the SD meet measurements I did were sampled at 44.1 kHz.
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anetode

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Re: STAX SR-009 Frequency Response
« Reply #15 on: November 05, 2013, 06:24:28 AM »
Quote from: ultrabike on November 04, 2013, 03:48:32 PM
Could be seal Ship. I've heard some people actually use rubber bands to press the Stax against the pads. Dunno.

The gimbals holding the cups of my 009 are beginning to disintegrate and the cable's been cutting out. I've been thinking about sourcing a whole new frame for the cups which would allow for increased clamping pressure. After all it'll be a hell of a lot cheaper than sending it in. I don't want to play around much with damping, the only problem I have with the tonality is that lower bass dip. Maybe a different bias voltage might also improve things.
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ultrabike

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Re: STAX SR-009 Frequency Response
« Reply #16 on: November 05, 2013, 06:44:22 AM »
Seems good seal (and perhaps clamping pressure - less air gap) with electrostats is important to get the bass (and sub-bass) out of the depths... In fact, I think all of them use sealed pads, which is why I think I should have measured them as closed cans facepalm.

Not the 009s but this dude had a similar problem with the SR-404s, and rubber bands seemed to have worked for him.
« Last Edit: November 05, 2013, 06:53:28 AM by ultrabike »
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jerg

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Re: STAX SR-009 Frequency Response
« Reply #17 on: November 05, 2013, 06:54:46 AM »
Quote from: ultrabike on November 04, 2013, 10:15:56 AM
Adding measurements taken at the SD Coronado Meet.

Frequency Response:



CSD right:



CSD left:



Relatively noisy meet conditions not optimal for distortion measurements.

These are no bass monsters. Relatively clean CSDs.

Amplifier was SRM-252. I believe Marv used a DIY-T2.

Holy cow! That's some amazingly fast decay in the treble there.
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jeffreyfranz

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Re: STAX SR-009 Frequency Response
« Reply #18 on: November 06, 2013, 08:20:15 PM »
Quote from: shipsupt on November 04, 2013, 12:06:13 PM
I'm certainly not going to argue about the 009 not being a bass monster, but this graph seems a bit far from what I'm hearing...


Chris/Ship:
20 dB down at 40Hz? I should hope so. Did not sound like that to me with Justin's pair on the BHSE at last July's LA meet. Or was that contributing to how floored I was by the inner detail further up? Psychoacoustic effect?
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ultrabike

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Re: STAX SR-009 Frequency Response
« Reply #19 on: November 06, 2013, 09:09:05 PM »
Nah, proly the fact I measured these as classic open cans... I would give credit to these measurements only 'bout 100 Hz up for now.
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