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.
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.
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'.
(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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