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dBu. (These are as measured into a 600 Ohm load; the recommended
load is > 10K Ohms; 0 dBu = 0.7746 V rms.)
When unbalancing the XLR output, pin-3 must be tied to ground at the
receiving end (i.e. the input of the following device). Do not tie pin-3 to
ground directly at the output of the RPQ500.
As a reminder, test your cables regularly to be sure that they are in
proper working order.
Input Impedance
The average preamp has an input impedance sitting around 1200
Ohms. Passive ribbon microphones and numerous moving-coil dynamic
microphones are very particular about how they interact with preamps
and their respective impedances play an important part in this. Since
passive ribbon microphones and some dynamic microphones generally
have a very high impedance, they are sensitive to what is referred to
as "loading." The lower the impedance a mic must drive, the harder
the mic has to work. If the input impedance of a preamp is too close to
the impedance of the microphone, it may exhibit increased distortion,
decreased headroom, poor transient response, and less overall
frequency response. There are no negative consequences to using high
input impedance preamps.
Unleash the full potential of your mics with the RPQ500's high
impedance circuit. The RPQ500's NoLoad™ high-input impedance
of 10K Ohms guarantees the highest sensitivity, bandwidth, transient
response, and clarity from your microphones.
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SETTING THE GAIN
The RPQ500's JFET circuit design generates up to 81dB of clean and
quiet gain, with extended bandwidth from below 1 Hz to beyond 200
kHz, for dynamic range and transient response that complements all
microphones.
As with any piece of audio equipment, setting and maintaining proper
signal levels are critical to obtaining optimum performance: if the level is
too low, you sacrifice noise performance; if too high, you risk overload
distortion. The AEA RPQ500 provides an easy method for setting and
monitoring the system gain.
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