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Author Topic: STAX SR-407  (Read 4018 times)

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ultrabike

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STAX SR-407
« on: November 04, 2013, 04:37:27 PM »

Measurements form the SD Coronado Meet:

Frequency Response (no smoothing)



CSD right



CSD left



Seal with these was difficult. Someone helped pushing them slightly, but perhaps needed more pressure against the pads.
« Last Edit: November 04, 2013, 06:30:50 PM by ultrabike »
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shipsupt

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Re: STAX SR-407
« Reply #1 on: November 04, 2013, 05:04:12 PM »

Standard Lambda pro I presume?

Thanks for posting!

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Yeah, well, you know, that's just, like, your opinion, man.

ultrabike

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Re: STAX SR-407
« Reply #2 on: November 04, 2013, 05:52:38 PM »

I think it was a Lambda Pro indeed. Seems this is Darinf's Lambda SR-407. Seems similar to the SR-404 (http://www.changstar.com/index.php/topic,352.0.html)

BTW I think I know why the bass rolls off early with this one and the SR-009. I measured them as I do most of the open cans... With a lossy baffle. Closed cans I measure with a rigid baffle and some damping inside. This makes a big difference in the bass region (not so much in the rest of the spectrum).

Given the Stax use sealed pads I probably should have measured them as closed cans. Unfortunately, I don't have them Stax with me to measure again.
« Last Edit: November 04, 2013, 06:29:51 PM by ultrabike »
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Azteca X

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Re: STAX SR-407
« Reply #3 on: November 04, 2013, 07:43:30 PM »

That's a tasty 100-1000.
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kiteki

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Re: STAX SR-407
« Reply #4 on: November 04, 2013, 07:58:18 PM »

What's the speed of that impulse response?  The 'back wall' section such as at 3 kHz to 6 kHz?  All I can see is it's less than 1.34ms.
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ultrabike

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Re: STAX SR-407
« Reply #5 on: November 04, 2013, 08:01:57 PM »

That's a tasty 100-1000.

Yup. Ignore the < 100 response given strong dependency on seal.

What's the speed of that impulse response?  The 'back wall' section such as at 3 kHz to 6 kHz?  All I can see is it's less than 1.34ms.

I think it's a pretty clean CSD. Measurement sampling rate was set to 44.1 kHz. If I get the chance to measure again, will try 96 kHz.

I heard these ones with some strings playing. Pretty immediate, but still a tad little bright IMO. Could be the recording. Great detail, but difficult to get the whole picture in noisy meet conditions.
« Last Edit: November 04, 2013, 08:07:59 PM by ultrabike »
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kiteki

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Re: STAX SR-407
« Reply #6 on: November 04, 2013, 08:14:32 PM »

Same amp used as in your SR-009 measurements?
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ultrabike

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Re: STAX SR-407
« Reply #7 on: November 04, 2013, 08:25:39 PM »

Yup. SRM-252. There was an SRM323A but didn't use that one.
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ihasmario

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Re: STAX SR-407
« Reply #8 on: October 18, 2014, 06:19:09 AM »

Ultrabike, could you explain why the treble is so low? Is it because of Stax using the FF curve and you using a different one? Do you still have the raw measurements?

Thanks
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Audiofire 12 -> Stax T1 -> Stax Lambda Signature

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ultrabike

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Re: STAX SR-407
« Reply #9 on: October 18, 2014, 06:47:21 AM »

Unfortunately I don't trust these measurements that much as I do the ones for the SR-307 since I didn't use a sealed baffle. Measurements are actually raw. No compensation was used, and this is the case for all the measurements I have so far.

Can't talk much about the treble on this particular cans since I didn't give them as much time as I gave the SR-307. However, notice the depression (similar to the SR-307) around 2 to 5.5 kHz followed by peaks in the 5.5 to 11 kHz area. My best guess is that such a depression in the high mids combined with peaks in the treble area are responsible for the somewhat bright perception of these cans (and perhaps it's etherealness).

Going by memory, I didn't find these (and the 307) painfully bright as I did the DT-990. Nor did I find them analytical. But there was a sparkle on them.
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