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The New iRiver AK100: A High-End DAP - Page 61

post #901 of 9113
Quote:
Originally Posted by Vinnie R. View Post

It's not a feedback loop, not a filter, and not for stability.
Perhaps it was put there for protection if the headphone
cable was shorted - but what headphone amp likes to
to shorted and puts 22 ohm resistors on the output
for this? They only get in the way optimal sound quality,
so OFF WITH THEIR HEADS!!!! smily_headphones1.gif

HERE HERE!!! Now your talking!!! I'm just hoping for a nice mod of this player so I can actually enjoy it when I purchase it.

I have faith you'll do us right,...beerchug.gif

post #902 of 9113
Quote:
Originally Posted by Vinnie R. View Post

It's not a feedback loop, not a filter, and not for stability.
Perhaps it was put there for protection if the headphone
cable was shorted - but what headphone amp likes to
to shorted and puts 22 ohm resistors on the output
for this? They only get in the way optimal sound quality,
so OFF WITH THEIR HEADS!!!! smily_headphones1.gif

Yay, good stuff. Might be tempted. Bring on the AK-Mod

post #903 of 9113

Just to clarity, "off with their heads" is me referring to the 22 ohm resistors - not any person.

I am not a barbarian and don't support such violence devil_face.gif  wink.gif

 

I also wanted to point out that you're really not "double amping" by feeding the headphone out to another amp, because the "line out" appears to be fed to a FET buffer stage (all tiny surface mount parts, BTW), so the headphone output can be viewed as a very low impedance "line out" when the volume is set to max.  Note that I put "line out" in quotes because you need to set the volume control to max because the volume control feeds data lines to the Wolfson dac chip - which sets attenuation from what I'm pretty sure is a 2Vrms max output voltage.  This max output level is only achieved with volume set to max (setting "75").  

 

So it makes sense that Ken at ALO and others have had success feeding the headphone output to their external headphone amplifiers - just set the volume to max and enjoy it!

 

But for those who want an all-in-one player, bypassing the 22-ohm resistors (and hard wiring the output of the FET buffers directly to the headphone jack pins on the 2nd level board is the way to go - bypassing the 22 output resistors, tiny circuit board traces, and a header that connects the main board to the smaller, 2nd level board above it that has the power switch and headphone / optical jacks.  I used Cardas copper litz solid core wire for this and it is very clean - right to the headphone jack pins! cool.gif

post #904 of 9113
Quote:
Originally Posted by Vinnie R. View Post

Just to clarity, "off with their heads" is me referring to the 22 ohm resistors - not any person.

I am not a barbarian and don't support such violence devil_face.gif  wink.gif

 

I also wanted to point out that you're really not "double amping" by feeding the headphone out to another amp, because the "line out" appears to be fed to a FET buffer stage (all tiny surface mount parts, BTW), so the headphone output can be viewed as a very low impedance "line out" when the volume is set to max.  Note that I put "line out" in quotes because you need to set the volume control to max because the volume control feeds data lines to the Wolfson dac chip - which sets attenuation from what I'm pretty sure is a 2Vrms max output voltage.  This max output level is only achieved with volume set to max (setting "75").  

 

So it makes sense that Ken at ALO and others have had success feeding the headphone output to their external headphone amplifiers - just set the volume to max and enjoy it!

 

But for those who want an all-in-one player, bypassing the 22-ohm resistors (and hard wiring the output of the FET buffers directly to the headphone jack pins on the 2nd level board is the way to go - bypassing the 22 output resistors, tiny circuit board traces, and a header that connects the main board to the smaller, 2nd level board above it that has the power switch and headphone / optical jacks.  I used Cardas copper litz solid core wire for this and it is very clean - right to the headphone jack pins! cool.gif

Thank you for the detailed discription. it is also cool that the Ak100 already has a line out for feeding to an external amp.

post #905 of 9113
Quote:
Originally Posted by Vinnie R. View Post

Just to clarity, "off with their heads" is me referring to the 22 ohm resistors - not any person.

I am not a barbarian and don't support such violence devil_face.gif  wink.gif

 

I also wanted to point out that you're really not "double amping" by feeding the headphone out to another amp, because the "line out" appears to be fed to a FET buffer stage (all tiny surface mount parts, BTW), so the headphone output can be viewed as a very low impedance "line out" when the volume is set to max.  Note that I put "line out" in quotes because you need to set the volume control to max because the volume control feeds data lines to the Wolfson dac chip - which sets attenuation from what I'm pretty sure is a 2Vrms max output voltage.  This max output level is only achieved with volume set to max (setting "75").  

 

So it makes sense that Ken at ALO and others have had success feeding the headphone output to their external headphone amplifiers - just set the volume to max and enjoy it!

 

But for those who want an all-in-one player, bypassing the 22-ohm resistors (and hard wiring the output of the FET buffers directly to the headphone jack pins on the 2nd level board is the way to go - bypassing the 22 output resistors, tiny circuit board traces, and a header that connects the main board to the smaller, 2nd level board above it that has the power switch and headphone / optical jacks.  I used Cardas copper litz solid core wire for this and it is very clean - right to the headphone jack pins! cool.gif

Estimate release date for your RWA100 is...............?

post #906 of 9113
Quote:
Originally Posted by audionewbi View Post

Estimate release date for your RWA100 is...............?
You beat me to the punch, as I was just about to ask the same question. cool.gif
post #907 of 9113
Quote:
Originally Posted by tds101 View Post


You beat me to the punch, as I was just about to ask the same question. cool.gif

Vinnie is playing hard to get....:P

post #908 of 9113
Quote:
Originally Posted by audionewbi View Post

Vinnie is playing hard to get....:P
Heh,...he's such a tease. wink.gif
post #909 of 9113
Quote:
Originally Posted by tds101 View Post


Heh,...he's such a tease. wink.gif

I'll just wait, not going to rush this one :-D

post #910 of 9113
Quote:
Originally Posted by Vinnie R. View Post

It's not a feedback loop, not a filter, and not for stability.
Perhaps it was put there for protection if the headphone
cable was shorted - but what headphone amp likes to
to shorted and puts 22 ohm resistors on the output
for this? They only get in the way optimal sound quality,
so OFF WITH THEIR HEADS!!!! smily_headphones1.gif

My thinking as well. Most opamps will take short duration shorts in stride so even pluging phones in at power should be fine.bigsmile_face.gif I bet it sounds a lot less creamy now, even with high impedance phones.

post #911 of 9113

.


Edited by AnAnalogSpirit - 2/27/14 at 12:23pm
post #912 of 9113

.


Edited by AnAnalogSpirit - 2/27/14 at 12:23pm
post #913 of 9113
Quote:
Originally Posted by FLACvest View Post

Here's some info on MediaMonkey and iTunes sync. There's A Plugin For That. wink.gif

 

http://www.mediamonkey.com/addons/browse/item/device-plugin-for-itunes/

 

I'm in the middle of reading the thread and don't recall if the device uses MSC or MTP for its USB mode, but if it is MTP, There's A Plugin For That, also:

 

http://www.mediamonkey.com/addons/browse/item/mtp-devices/

So is mediamonkey the best FLAc conversion program?

post #914 of 9113
I find MediaMonkey to be excellent for conversions. Some still prefer foobar2000,...MM is excellent.
post #915 of 9113

Interesting info, alas Windows-centric (tbc: nothing wrong with using Windows) I myself used foobar2000 for a quite few years when Windows was still my everyday OS, in part because it was/is so flexible.

 

On the OS X end of things, I'd very much recommend XLD (link) Despite the sparse look, it is very complete and regularly update incl. the de/encoder plugins. It can convert pretty much any format into any other format, exposes most settings in a corresponding easy-to-use preferences panel, lets you save those in selectable custom profiles, allows you to set file/folder-naming templates, uses a secure ripper tying into the AccuRip database, and has been adding support for more online resources to get album info & art etc.

 

It's very complete indeed, I'd never let iTunes do any of that. I have disabled all the iTunes management functionality and pretty much use it:

- to make small corrections to tagging etc. & make playlists ("smart" playlists can be surprisingly useful)

- since it's scriptable, there are quite a few of those available to add advanced functionality as in other more advanced managers. For example the "Embed Artwork" script ensures independence from iTunes artwork database, so that all my files are self-contained and can be used in Windows or Linux any time...

- as player with the BitPerfect plugin,

- most importantly, as the unavoidable transfer utility for iDevices

 

As far as ALAC goes, I think from a functionality POV it's every bit as good FLAC, and is supported in pretty much any software player in any OS at this point. Since Apple open-sourced & made it royalty-free last November there is no danger of it disappearing any more than FLAC. The only hitch is portable players which do not universally support it (like the AK100 at this time)

 

AAC I personally don't care about, from my listening experience an MP3 track encoded with a recent encoder at maximum quality (CBR or VBR) sounds every bit as good as the equivalent AAC file and has no trouble playing back on any iDevice as well as any other portable player under the sun.


Edited by TheGrumpyOldMan - 12/16/12 at 3:55pm
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