506AFC - Auto Gain control

[bdauvergne]

The 506 AFC features an Automatic gain control (compressor). Alhough this feature is great for listening to classical music, it's a bit annoying when using the headphones for monitoring (i.e. when only one instrument is playing and when a second one comes in, the level of the first is squashed)

Is there a way of disabling this feature or narrowing the compression effect?

Alternatively, where could I get the schematics to find out what to do (once the warranty has expired...)

Thanks, Bertrand

[musicmat]

Hi Bertrand,

hi hate this same behaviour too.

I soldered PIN2 of the AGC (IC BA3313) to Ground. This disables it.
You could also experiment with different settings on the time constant (resistior and capacitor which are connected to PIN2).

BA3313 is the upright standing IC
PIN 1 is marked with the DOT and is the first Pin on the left front row.
PIN 2 is the first left pin in the Back row.

 2  4 ...
1 3  5 ...


Have fun!

MM

[audioburg]

Hi Bertrand,

We recommend our HEARO 999 II for monitoring.


--
kind regards

Horst
AKG hotline

[bdauvergne]

Thanks for the info.

Since I haven't (due to warranty contraints) taken it apart: Is the IC BA3313 in the base or in the headphones?

A on/off switch on the next version would be a winner!

Cheers, Bertrand

[musicmat]

You are right, its on the PCB in the base station

MM

[arievoog]

First of all, AKG shows to be a professional manufacturer by giving the opportunity to customers to say what they think about AKG products on the official AKG-site !!

I bought a AKG wireless headphones some 6 years ago and I liked the sound except for one important thing: the compression of the sound when volume is rising. Especially in classical music this is very annoying. After two years I bought the wired 500, hoping in the future AKG would solve this compression-problem. I never used the wireless again.

Now I read about the 506 that the same problem still exists. At a price of around 200 euro's this is unaccaptable. Suggestion for AKG: introduce a switch "compresion on / compression off" and you will sell a lot more. The suggestion from Horst Of the AKG-hotline to buy the Hearo  999 instead, is not really a serious alternative, since it costs 6 times more than the 506!!

For the time being I stick yo my old wired 500 and will wait some more years until the problem is solved.

Question to AKG: WHY COMPRESSION ??

[audioburg]

Hi arievoog,

The automatic limiter is obligatory required as regulations by the telecommunication authorities stipulate that a certain maximum deviation level shall never be exceeded during use.

--
kind regards / beste Gr?sse

Horst
AKG hotline