"Twice as loud" =3D 6 dB. So the Gigatracker noise is 2.67*6 dB louder, or
2^2.67 =3D 6.3 times louder noise than the 722.
They report a 115 dBu EIN without saying which gain setting was used. If
they used maximum gain (the +50 dB range) then -115 dBu is reasonable
provided they used one of the ultra-low-noise op-amps for the first mic
gain stage. The total gain of +50 dB isn't so hot, however, as that's in
the same range as the ENG decks (for comparison, the 722 had +70 dB
gain, and the minidisks have +75 dB gain at high sensitivity setting).
The unit looks more like a concert recording rig than a nature recorder.
Bruce Wilson
http://wilson.dynu.net
>-----Original Message-----
>From:
> On Behalf Of oryoki2000
>Sent: Thursday, April 20, 2006 3:05 PM
>To:
>Subject: [Nature Recordists] Re: SP-Gigatracker self-noise
>
>Rob Danielson wrote:
>
>> Given a rating of -115 dBU EIN for the outboard pre, its not likely
>> to perform as well as mic pre in the Sony HiMD's. I can ask Chris at
>> SP about this claim...-115 dBu EIN is "borderline" performance for
>> many of the condensor mics we use
>
>Yes, please ask your contact at Sound Professionals to clarify their
>claim that a preamp with EIN of -115dBU sounds less noisy than a
>minidisc mic preamp.
>
>Let me display my poor understanding of the dBU scale: If the
>SP-Gigatracker has a preamp EIN of -115dBU and the Sound Devices 722
>has a preamp EIN of -131 dBU, does the Gigatracker have twice as much
>self-noise?
>
>--oryoki
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