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Subject: Re: Any way to reduce Archos stereo mic level?
From: tenvelde_at_xtra.co.nz
Date: 2003-11-22


The solution depends on the cause - if the overload was caused by too high levels going into the JBR, then you may be able to fix the problem electrically, if the problem is an acoustic overload of the microphone, there isn't much you can do about it (you can try an acoustic filter of some sort, like packing the mic with foam rubber, but that will also effect the frequency response).

To tell what the problem is - check the level meters on the JBR display - if they're peaking out during recording, it's possible to set up a potential divider of some sort. Try a dual-gang 10k logarithmic potentiometer, connect the outside tags to the output of the pre-amp, and the "earthy" side and the centre tags to the JBR.

If the level meters weren't peaking out, it's most likely the microphone that's the problem. Quality microphones will work up to very high acoustic levels (say 140 dB) without distorting, but then you pay several hundred dollars for each microphone alone, let alone the pre-amp. My guess is that these mics wouldn't handle much over about 100 dB, if that.

Hope that makes sense.

John

>
> From: "Bob Salwasser" <bobs_at_tlcelectronics.com>
> Date: 2003/11/22 Sat AM 07:49:16 GMT+13:00
> To: <rockbox_at_cool.haxx.se>
> Subject: Any way to reduce Archos stereo mic level?
>
> Hello all! I just tried out the Archos mic at a local bar this past
> week,
> with the band's permission, mind you. Absolutely nothing worked. Every
> level setting, in both Rockbox 2.0 and Archos 1.27d firmware, resulted
> in severe
> overload. Isn't there something that could fix this? That's a lot
> of cash to spend for a mic that does not work! Thanks. -Bob (new to the
> list, but a Rockbox user since I bought my Recorder 20, over a year ago)
>
>
>
> Bob Salwasser / TLC Electronics
>
> IT/Network Support /
> Purchasing
>
> bobs_at_tlcelectronics.com
> www.tlcelectronics.com
>
>



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