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Old 02-27-2002, 11:35 PM
Jason from MaggieJack Jason from MaggieJack is offline
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Default More of the Mic Pre\'s Gain!

In the hardware setup, I was comparing the gain reduction between -2 and -14. When set to -14 you can push the preamp more, it was just peeking the meter in the yellow on the preamp. At -2 it's not yellow at all. Personally I liked it when the preamp was hotter and the gain set to -14.

Have any of you experimented with this? What do you think?

Jason
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Old 02-28-2002, 06:18 AM
where02190 where02190 is offline
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Default Re: More of the Mic Pre\'s Gain!

If I have this right, you are talking outboard preamps into line inputs for the 001. Set your inputs gain to +4db line level, and you'll be able to push your preamp as hard as you want and have proper sensitivity settings. Keep in mind that at some point all you are doing is adding noise from your preamp, particularly when pushing the output gain. In the digital domain, there is no need to get close to zero. An input level of -15dbfs is more than sufficient, and translates to about 0dbu.
I understand you are trying to get a specific sound from your preamps by driving them hard. It's a matter of gain matching to the 001 and best signal to noise ratio.
You might want to check over the post http://duc. digidesign.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic&f=24&t=010251.
Hope this is helpful.
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Old 02-28-2002, 07:24 AM
Jason from MaggieJack Jason from MaggieJack is offline
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Default Re: More of the Mic Pre\'s Gain!

It makes sense that if I have the imput levels set to -14db that since the preamp needs to be turned up louder that it will create more noise. It did seem as though there was a fatter sound when I could crank the preamp as opposed to the default of -2db on the imput levels.

If I raised it to +4 wouldn't I need to turn the preamp down even more?

Could we call this fake headroom that would allow us to send a hotter signal than 99db to the convertor?

I've also heard it's best to use pads on mics instead of preamps, would this be the same case?

Thanks,
Jason
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Old 02-28-2002, 07:45 AM
where02190 where02190 is offline
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Default Re: More of the Mic Pre\'s Gain!

These numerical terms refer to sensitivity relative to 0dbu, +4db=0 reference vs -10db=0 reference. You have more headroom at +4 than -10, since at -10 you hit zero 14db lower than at +4. (4+(-10)=14db.

Padding mics is generally prefered to padding preamps, depending on the situation. If the mic signal is too hot for the preamp then pad the mic pre. if the mic is overloading, pad the mic.

Hope this is helpful.
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Old 02-28-2002, 07:57 AM
sugarfuzz sugarfuzz is offline
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Default Re: More of the Mic Pre\'s Gain!

Ok, guys, I am using a presonus M80.
If I am understanding this right, I should set My input levels in protools to +4db, then adjust the pre amp gain to give me enough signal without clipping, and this will give me optimum signal level?
Am I right, or just plain confused?

thanks
chad
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Old 02-28-2002, 08:28 AM
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Park Seward Park Seward is offline
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Default Re: More of the Mic Pre\'s Gain!

Yes. You want the output of the mic pre to match the input gain of the 001. You then adjust the mic gain with the mic pre.

Some may find this silly but you can usually tell if you are in a proper gain range by the position of the controls. If the gain controls are around 12 o'clock to 2 o'clock, you are in a good range. If you have the pot at 7 o'clock or 4 o'clock, something may be wrong. The sweet spot on most equipment seems to be 70-80% of the pot's range.
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