Can we fix the audio for A5/A6/A7?

[Andy Green]

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Somebody in the thread at some point said:

|> They're ~32R apparently, with 33R in series (R4405 / R4407) so it is
~65R.
| Yep, so *no* standard replacement headphone will fit. No Motorola, no
Sony,
| just OM-headset (as long as at least these have 600~1000Ohm for
f0=300~400Hz!)
| No use to tell in wiki about the standard pinout of connector.

I googled around but I didn't find any information about what is common.
~ Yeah it would be better to be compatible for sure, but we do ship 32R
headset.

|> So the impact is we lost some bass end... maybe not a noticeable amount
|> to what we would have with 100u due to the transducer performance.
|
| We have a f0 of ~160Hz WITH OPEN CIRCUIT, just due to the 1k pulldowns!
| With a 1000 Ohm headset, this will be 320Hz for -3dB!!!
| That's noticeable for sure. It's plain crap.

We don't ship 1K impedence headset, since we didn't target it we just
have to look after what we did ship with.

|> there's no room for adjusting the value of the caps on the A5 or A6 PCB
|> then I would just accept this.
| At very very least we can increase the thing to 4.7u, it fits on
current PCB.

Allen can say yes or no to this, but I think first he would try it both
ways.

| Think one of my first tasks in .tw will be retrofitting the 100uF and
compare
| the sound. Maybe i can do a nice foto footage for the wiki, so anybody
with
| good soldering skills can do the same, if they are interested in HiFi.

If I had a clue about the ALSA profile end I would try it for you.

- -Andy
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