We are looking for a full turn key solution for a few headphone audio products. The following specs are for the desktop amplifier.
Technical specs - must meet or exceed the following
frequency response - +/- 0.1 db
thd 1khz @ 150 ohms - .0016%
thd 1 khz @ 15 ohms - .0023%
thd 20 hz @ 15 ohms - .0023%
thd 20 khz @ 15 ohms - .010%
noise - must be at a minimum -100db, would prefer 105-110
max output @ 15 ohms - 400mw
max output @ 33 ohms - 700mw
max output @ 150 ohms - 600 mw
output impedance - minimum .5 ohms, would be nice for .1 ohms
crosstalk @ 15 ohms - 70db
channel balance - .5db or lower
both 1/4'' and 3.5mm outputs - no more adapters. It's one of the major
limits of the objective2 that we can't have both outputs for all
rca inputs and outputs - pretty simple and a standard in most designs
usb and optical inputs - again a limiting factor in the odac. We would
like to use the type b connector if possible.
No drivers - we will be using the same class1 driverless dac chip.
Will work with all os's. (linux, windows, and mac)
small design, 2-3 models - much like the o2/odac, we plan on selling
just the amp, just the dac, or an all in one unit. Everything will be
in a small compact case hopefully not much bigger than the standard o2
extruded aluminium case - to save costs we plan on using extruded
aluminium design for a case.
Microphone pass through - another feature that we would like your
input with. A lot of gamers have analog headsets with microphone
costs - realistically the most important part. We are looking at the
$100, $200 and $300 price point for 3 different models. What do you
Gain? - gain switch (in the rear) we plan on having possibly 3 gain
levels - 1x, 2x and 6x. This will cover 99% of the headphones on the
power!!!! - we plan on having the same output volume as the o2 (or
higher if possible without clipping).
For the portable design
i'd like to have something like this. Specifications will have to be
just as good if not better than what he has. I would also like to omit
the bass boost option. I've tried it, and it makes a lot of headphones
sound bad.+13 Other Responses