Crest Audio IPRO ONE Manuel - Page 13

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PRACTICAL APPLICATIONS

There are many uses for the IPro One

creative talents. The main ingredient is the IPro One's ease of setup and use. With mic and line pre-amps, two

parametric equalizers, full dynamics, SmarTube

there is nothing easier to use. These procedures assume that all settings default to a disabled (or non-influencing) state

and are adjusted per instructions. (The low cut is set at 10 Hz, SmarTube Enhance is off, main level is centered, blend

is set fully CW, line and mic gain controls are minimum, and all on/off switches are off.)

RECORDING FROM A MIC (COMPLETE SETUP): One of the most common uses for the IPro One is as a pre-amp for

recording, either with an analog tape machine or a digital recorder (such as a computer or digital multi-track tape

machine). This unit has all the functions necessary. Here is the setup:

Begin with all the functions off (see above).

Connect the mic to the XLR input (front or rear) and turn on phantom power if required.

Set the output meter select switch to pre-amp to check the front end levels and adjust the mic gain control to

give a 0 dBu average level.

Engage the dynamics section and set the limiter so that it prevents the output from exceeding the maximum

output level desired. This can be checked by turning up the mic gain until the gain reduction LEDs begin to

light. With the meter switch set to check the output, watch the maximum levels and adjust the limit level to hold

it to the desired level. Then repeat step #2 to set the mic to the nominal 0 dBu level.

If there is too much low frequency energy getting into the mic (stage rumble, wind noise, breath explosives, or

proximity effects) raise the low cut frequency until the signal sounds natural.

Engage the parametric filters and adjust to taste. Always remember – a little is better than a lot, especially when

it comes to EQ! Usually slight notches with moderate bandwidths in the 200 Hz and 2 kHz areas are all that is

required. (Unless you are shooting for that AM radio sound!)

Let the mic pickup background noise and set the expander ratio to center. Gradually raise the expander

threshold until 9 or 12 dB (or even more if the noise level is high) of gain reduction is seen on the dynamics

meter. Then add the source material and listen for excessive dropouts or cut-off syllables. The expander

threshold or the ratio may need to be lowered if artifacts are heard.

Normally, vocalists have such a great dynamic range that it is difficult to adequately record them. We can

overcome this problem by adding compression. A good starting point is to set the compressor ratio to 3 or 4 to 1,

and bring down the compressor threshold until 6 to 9 dB of gain reduction is seen on the meter. Add more or

less to achieve the sound you want. Adjust the dynamic's gain control to restore the signal level to the nominal

0 dBu.

Because compression is driven primarily by the low frequency content of the source, the highs tend to get

swallowed up in the gain reduction. A special circuit has been built into the IPro One to compensate for this

apparent loss. It is the SmarTube Enhance section which generates high frequency harmonics from the source

material and adds them back in to brighten and sharpen (add sheen) the source. Start with the frequency and

level controls centered and adjust as needed. Again, less is better! This circuit can get obnoxious quickly, if the

level is set too high! Tune the frequency control for the most pleasing harmonics, different sources may need

different settings to add what they don't have.

10.

Set the output level to match the recording input levels with the main level control.

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, limited only by your imagination. Here are some suggested uses to inspire your

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Enhance, and headphone outputs all connected and in one place,