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Audio Engineering Associates RP48Q Operating Manual

Manual is about: Ribbon Preamp with Curve Shaping

Summary of RP48Q

  • Page 1

    Aea rp 48 q ribbon preamp with curve shaping operating manual 1029 n. Allen ave. Pasadena ca 91104 www.Ribbonmics.Com phone: (626) 798-9128 fax: (626) 798-2378 • studio ribbon mics • mic positioners • tall stands • accessories a udio e ngineering associates introduction the aea rp 48 q ribbon preamp...

  • Page 2

    1 – phantom power switch: out is off; in applies full-spec p48 phantom power to the ac-coupled input (see #17 on back panel): 48 vdc / 10 ma per channel under any load condition. 2 – polarity invert switch: out is normal; in is inverted. 3 – input gain: this twelve-position switch selects from +7 db...

  • Page 3

    13 – operating voltage checkmark: indicates the internal factory wiring for the operating voltage, 120 vac or 240 vac. 14 – ¼” trs jack unbalanced output: provides maximum output of +22 dbu; 100 k Ω load. The recommended load is > 10 k Ω. 15 – xlr balanced output: provides maximum output of +28 dbu,...

  • Page 4

    1 2 3 1 2 3 xlr mic inputs (use one only) dc ac phantom capable +48 v phantom on / off 7 11 15 20 24 28 32 36 40 45 50 55 +7 db +55 18 360 85 hz low cut filter high boost 26 khz 2.1 khz 9 khz +18 +0 peak db boost +19 +0 +6 db 1 2 3 balanced xlr out (pin 2 high) max gain: +80 db 600 unbalanced 1/4”...

  • Page 5

    Signals at line-level back to the control room. To prevent damaging the equipment in your system, it is a good idea to test your microphone cables regularly to determine whether they have any open, shorted, reversed, or intermittent connections. 2 de- fective cables can cause absence of signal which...

  • Page 6

    Setting the gain 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 rp 48 q provides an easy method for setting a...

  • Page 7

    Figure 4: response of lf filter lf filters tame proximity effect and reduce other unwanted low-frequency noise, such as air-condition- ing rumble, traffic noise, “p-pops” and breath-noise noise. However, a fixed-frequency, constant slope low-cut filter cannot handle all situations effectively. The rp 48...

  • Page 8

    Figure 5: response of curve-shaper . Red curves show hf gain at half-boost, blue curves hf gain at full-boost. Gain setting you achieve satisfactory results. Be careful when you add hf gain because this also affects the overall gain structure of the preamplifier and could introduce overload distortio...

  • Page 9

    Higher. • output gain control: continuously variable from +0 db to +19 db of additional output gain, follow- ing the curve-shaper circuitry • switched lf shelving filter: -3 db break-frequency tunable from 18 hz to 360 hz; maximum reduc- tion -20 db • switched curve-shaper and hf boost: +3db break-fr...

  • Page 10

    Other products by audio engineering associates: a440 the first active 44-style microphone. Finally, the warm sound you love combined with the sig- nal strength of a powered mic. Trp high-gain 2-channel half rack unit optimized for passive ribbon microphones rca working reproduction microphones and re...