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KRK RP8 Autopsy

This is a close-up picture of the Active Filter Board. This is the board that takes the input from the RCA, TRS and XLR jacks and split the frequencies into low and highs so it can be routed to their respective amplifiers.

The square thingy you see is the selector switch for the Gain, and to the right of that is the potentiometer for the volume level adjust.

The Active Filter uses 4580D opamp chips for the high-pass and low--pass filters.

Close-up of the JRC 4580 op amp chips used in the Active Filter board.

Here is a PDF link to the 4580 datasheet.

NJM4580 is the dual operational amplifier, specially designed
for improving the tone control, which is most suitable for the
audio application.

Featuring noiseless, higher gain bandwidth, high output
current and low distortion ratio, and it is most suitable not only
for acoustic electronic parts of audio pre-amp and active filter,
but also for the industrial measurement tools. It is also suitable
for the head phone amp at higher output current, and further
more, it can be applied for the handy type set operational
amplifier of general purpose in application of low voltage single
supply type which is properly biased of the low voltage source.

• FEATURES
• Operating Voltage ( ±2V~±18V )
• Low Input Noise Voltage ( 0.8μVrms typ. )
• Wide Gain Bandwidth Product ( 15MHz typ. )
• Low Distortion ( 0.0005% typ. )
• Slew Rate ( 5V/μs typ. )
• Package Outline DIP8,SIP8,EMP8,SSOP8,DMP8

In case you're wondering, JRC stands for "Japan Radio Co." ... their website can be found at http://njr.co.jp

Next Page... Amplifier Board and PSU

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