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Main features:
1, Replaceable battery ( compatible with NOKIA BL-5B)
2, working voltage: +/- 4.5V or +/- 6V;
3, Voltage Gain: 10 dB;
4, Volume control: Alps potentionmeter;
5, OP: AD8397;
6, Output power: >150mW;
7, Case: Aluminium alloy!
8, Playtime: 10 Hours!
9, ETA: March, 2011
We may show the engineer sample of E11, in the hong kong Headphone Festival 2010~2011 ( Jan 8, 2011)
Is that > 150 mW per channel, or total?
It is about 180-200mW /Channels at @16ohms, and AD8397 have high current output ( in fact, it is op+buf inside AD8397). that is why it used in some famous portable amp!
Okay, wow! So there's tons of headroom for peaks with that chip, since it's capable of 310 mA peak output - the current supply of the battery/power supply is the limit then (you can only feed it an average of about a third of that [111.8 mA at 16 ohms at 200 mW (an average of 1.7885 V)], if my quick estimate is correct).
I'm not that familiar with power supplies and voltage converters - is the the E11 capable of providing the maximum current all the way to the maximum +/- 6 V voltage swing? If so it would seem it can put a whole lot of power into medium impedance headphones; perhaps enough for portable use of the more power-hungry orthodynamics. (Hey, I can hope, right?!?)
As I start looking at this I'm beginning to see how truly complicated the design and output of an amplifier can be...