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Old 18th August 2011, 09:37 AM   #1
210 is offline 210  Germany
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Default STAX conclusion

The headphones:

The Lambda series (SR-20x, SR-30x, SR-40x, SR-50x) has a more balanced frequency response
between 1kHz and 10kHz compared to the Omega series (SR-007, SR-009).

The SR-507 has the deepest and strongest bass response of all Stax headphones.

Except the newest SR-007 version (with a better membrane material)
the old SR-007's also have a level drop of about 6dB above 1kHz.

The membrane material of all new versions can better withstand humidity and better keep the membrane tension.
From the old versions, the SR-202 has the thickest membrane so it will probably last longest.



The amplifiers:

The smallest SRM-252 consumes less than 5 Watt and can deliver max. 280Vrms output voltage.
That's normally sufficient, because Stax headphones deliver about 100 db sound pressure level at 100Vrms.

The biggest SRM-727 has a unique non feedback output stage, but it consumes about 46 Watt.
50 Watt or more power consumption for a headphone amplifier is surely a wasting of energy.

Valve amplifiers aren't appropriate anymore. They consume too much power for heating,
need maintenance and are quite dangerous because of the hot and breakable tubes.
If you want to avoid trouble with your insurance company (if your house burns down),
it will be better to avoid tube amplifiers.
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Old 18th August 2011, 10:36 AM   #2
210 is offline 210  Germany
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Edit: the old SR-007's have an average level drop of about 6dB above 1kHz, so they need to be equalized to get a balanced frequency response or need an amplifier that emphase the higher frequencies
(but then the peaks were also emphased!).
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Old 18th August 2011, 12:54 PM   #3
awpagan is offline awpagan  Australia
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Interesting but..
"The Lambda series (SR-20x, SR-30x, SR-40x, SR-50x) has a more balanced frequency response"
SR-404/407????

Where did you get your measurements from?
6db down at 1kHz?
Is that a dip or does it goes down from there?

Valves waist power?? no joke..

It's all pretty generalized..
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Old 18th August 2011, 02:02 PM   #4
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Quote:
Originally Posted by 210 View Post

Valve amplifiers aren't appropriate anymore.
You should post that one in the tubes category of the forum.
Hope You have Your asbestos suit handy
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Old 11th March 2012, 07:40 PM   #5
210 is offline 210  Germany
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Seems, the folks who like to use input tubes won't miss them
(and they are probably low voltage, low heating tubes out there),
but I doubt, that an electron cloud (with it's average kinetic energy)
can be better controlled than conducting in silicium (no expert).

Imho, they are just two (hifi) audio areas, where (full) tubeamps will stay. One is in the generating process of music (guitaramps etc.), where they 'make the sound'.
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