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Author Topic: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements  (Read 5175 times)

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Marvey

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STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements



Had some trouble getting a seal. But graph should be comparable to the mk2.5 results. Keep in mind my mk2.5s are modded with the full bent springs and 90% obstruction of the vents.
« Last Edit: July 03, 2012, 06:53:31 PM by purrin »
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Elysian

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #1 on: July 03, 2012, 06:54:23 PM »

How does that difference around 7k-8k between the MK1 and MK2.5 measurements manifest in the sound?
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Marvey

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #2 on: July 03, 2012, 06:58:54 PM »

It's evident. While the extreme dip is an artifact, the mk2.5 subjectively has more amplitude in this sibilance region. There seem to be some fundamental design differences in the pads and how they affect bass which aren't accounted for in these measurements.
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anetode

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #3 on: July 03, 2012, 07:04:37 PM »

Smooth but a bit dull, looks about right.
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rhythmdevils

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #4 on: July 03, 2012, 07:05:52 PM »

The MK2.5 looks cleaner around 7k too.  Interesting.  Going by the CSD's, the MK2.5 looks like a nice refinement of the MK1
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Elysian

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #5 on: July 03, 2012, 07:06:41 PM »

It's evident. While the extreme dip is an artifact, the mk2.5 subjectively has more amplitude in this sibilance region. There seem to be some fundamental design differences in the pads and how they affect bass which aren't accounted for in these measurements.
Thanks.  It'd be interesting to know how much the pads and the port modification contribute to the change.

I'm assuming the delta in the 7-8k range is the famous mid-bass emphasis for the MK2 and MK2.5?
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Marvey

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #6 on: July 03, 2012, 07:19:46 PM »

No the bass is the result of the "ports" where the cable goes into the cup. The mk2/2.5s have an open port. This opens up the seal and creates more mid-bass at the expense of low bass.  The mk2.5s I measured have mods which sealed off most of this area.

The mk2/2.5s are said to be more forward sounding. The 7k difference could explain why.
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Anaxilus.

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #7 on: July 03, 2012, 08:55:45 PM »

Smooth but a bit dull, looks about right.


x2
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omegakitty

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #8 on: July 03, 2012, 10:02:42 PM »

The MK2.5 looks cleaner around 7k too.  Interesting.  Going by the CSD's, the MK2.5 looks like a nice refinement of the MK1

Not sure I would agree the 2.5 is more refined. IMO after comparing both I thought it was a step backward from the mk1 (ports sealed on 2.5), most obvious on female vocals.
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sachu

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Re: STAX SR007mk1 Frequency Response and CSD Waterfall Plot Measurements
« Reply #9 on: July 03, 2012, 10:21:31 PM »

interesting.. going by the 009 plot, it almost seems the 009 has a teeny bit more of a mid bass hump..and even seems to extend lower better than the 007.

A lot smoother past 1k on the 009.

Marv, would you say you were satisfied with the seal on the O2mk1 when measuring or would it be worth having a second or third look at measuring these.
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