Shure fp31 owners manual
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Page 1
SPECIFICATIONS Frequency Response 30 Hz to 20 kHz +2 dB Distortion Less than 0.25O/0 total harmonic distortion at +4 dBm, 50 Hz to 20 kHz Noise Less than - 129 dBV equivalent input noise Common Mode Rejection 65 dB minimum at 100 Hz, -30 dBV input Inputs Line IMPEDANCE 19 to 6003* Less than 10 k3 66 k3 lnput Clipping Level -47 to -17 dBV (4.5 to 141 mV) +3 to +33 dBV (1.4 to 44V) i 'Including simplex or A-B powered, and dynamic or ribbon microphones Tone Oscillator 1 kHz nominal at +4 dBm, Master at approx. 7 Slate Tone 400 Hz, 1 sec, each time button is depressed Slate Microphone Electret condenser, omnidirectional, with AGC, ac- tivated while slate button is depressed Mic Line Tape Phone Outputs Any low-Z mic input 6003 IMPEDANCE For Use With 1 Actual 18 k0 or greater Output Clipping Level high level input 83 to 2 k3 - 34 dBV (20 mV) minimum into 1503 + 18 dBm minimum into 6003 -6 dBV (0.5V RMS) into 47 k3 +4 dBV (1.6V RMS Max) into 2003 Phase 3-pin lnput & Output connectors in phase; pin 3 in phase with tip of phone & mini jacks Gain (at 1 kHz) INPUT OUTPUT Line Line -10 dB 40 dB Controls CHANNEL GAIN: Active, feedback type, individual for each input; Channel 1 control pulls out to activate tone oscillator MASTER GAIN: Controls LinelMic and Tape out- puts, and tone oscillator and slate levels LOW-CUT FILTERS: 7 dB rolloff at 100 Hz, -6 dBloctave slope PHONES LEVEL: Controls both headphone outputs LIMITER: Controls LinelMic and Tape outputs; + 14 dBm factory-set threshold, internally screwdriver ad- justable down to + 3 dBm; 3 msec attack, 500 msec recovery time typical SIMPLEXIDYNAMICIA-B SELECTORS: Individual for each input, supplies 11 to 18 Vdc Simplex (phan- tom) or 9 Vdc A-B power with lnput in MIC position; supplies no power with Selector in DYN position (for dynamic or ribbon microphones) or with lnput in LINE position Control Interaction Less than 1 dB with any control combination Output Isolation Shorting one output shall cause no more than 8 dB level drop at 1 kHz at other output Overload and Shorting Protection Shorting outputs, even for prolonged periods, shall cause no damage. Microphone inputs will not be damaged by signals up to 3 volts. Indicators POWER ON: Green LED flashes at approximately I-second repetition rate as long as power switch is on PEAKIOVERLOAD: Limiter IN - Red LED flashes to indicate onset of limiting; Limiter OUT-flashes 6 dB below output clipping level BATTERY CHECK: Converts VU Meter to battery condition or circuit voltage indicator; 0 VU or higher indicates good batteries or adequate (11 to 18 Vdc) external power source VU METER: Factory-set at 0 VU = +4 dBm; 0 VU level internally screwdriver adjustable VU LAMP: Illuminates meter while button is depressed; automatic shufoff 5 seconds after release Power MIXER AND SIMPLEX (PHANTOM) POWER: SUP- plied by two internal 9V standard alkaline batteries (Duracell MN1604 or equivalent) or external 11 to 18 Vdc supply; &hour battery life under normal opera- tion SIMPLEX POWER: 11 to 18 Vdc nominal through 6200 A-B POWER: Supplied by additional 9V standard alkaline battery Connectors LlNElMlC INPUTS AND OUTPUTS: 3-pin XLR type TAPE OUT: 3.5 mm mini jack PHONES: Stereo jacks; one standard %-inch phone and one 3.5 mm mini 12 VDC EXTERNAL POWER: Single-pin dc power jack Temperature Range OPERATING: - 18 to + 57OC (0 to 135OF) STORAGE: -29 to +7I0C (-20 to + 160°F) Dimensions 48.3 mm H x 160 mm W x 135 mm D (1-718 x 6-5116 x 5-5116 in.) Net Weight (less batteries) 1 kg (2.2 Ib) Supplied Accessories Removable shoulder strap, carrying case
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OPERATION LineIMic Inputs and Outputs XLR-type 3-pin connectors, transformer-coupled ba- lanced-line circuits; pins 2 and 3 are signal conductors; pin 1 is ground. All XLR connectors are in phase with one another. Lo-Cut Filters Activated by Inlout switch above each Channel Gain Control to provide low-frequency rolloff as shown in Figure 1. Reduce undesirable low-frequency signals such as wind noise. FREQUENCY IN Hz LO-CUT FILTER ACTION FIGURE 1 Channel Gain Controls Determine preamplifier gain and provide preamplifier output attenuation. As gain is reduced, input clipping level increases for channel. Optimum signal-to-noise ratio occurs with Channel controlsset as high as possi- ble (consistent with maintaining adequate control range and input clipping level). Tone Oscillator Activated by pulling out Channel 1 control knob; stable 1 kHz oscillator; level determined by Master gain con- trol. Oscillator signal appears at all outputs. When not in use, Channel 1 control knob should be pushed in. Slate Depressing Slate button activates 1 -second 400 Hz tone and turns on Slate Microphone. Omnidirectional electret Slate Microphone remains on while button is depressed, can be used to identify recorded segments or as emergency field microphone. Slate Tone and AGC'd microphone audio levels are controlled by Mas- ter Gain Control. Master Gain Control Determines output levels at LineJMic and Tape out- puts. Also sets Tone Oscillator level when Channel 1 knob is pulled out, and Slate-tone and -microphone level when Slate button is pushed. Headphone Jacks Two stereo phone jacks: one mini 3.5 mm (front panel) and one 114-inch phone (side panel). Combined out- put, including Tone Oscillator, Slate Tone and Slate Mi- crophone, appears at headphone jacks. Can be used to drive up to four headphones or Aux-level recorder or amplifier inputs. To wire either connector for two out- puts, connect one conductor to tip; connect other con- ductor to ring; and connect shield(s) to sleeve of appro- priate mating stereo plug. Tip and ring of headphone jacks in-phase with pin 3 of XLR LineJMicinput andout- put connectors. Phones Control Sets output level at headphone jacks. Limiter Limiter Inlout switch turns on fast-acting, peak-res- ponding limiter circuit to cut overload distortion during loud program intervals without affecting normal pro- gram levels. Limiter switch In (operating) restricts maximum mixer output to approximately +14 dBm. In- creasing individual Channel or Master gain controls in- creases both average output and amount of limiting. To change Limiter threshold, see section on Limiter Threshold Adjustment. Peak LED Indicates Limiter operation with Limiter switch In. With switch Out, flashes at 6dB below output clipping. Peak indicator responds much faster than meter, activated by even shortest transient peak, yet remains lit long enough to provide easy recognition. VU Meter Factory calibrated for +4 dBm = 0 VU with 600-ohm load at Line output. (Microphone output levels are 50 dB below Line output.) Supplied 0 VU level is recom- mended for normal use to provide approximately 14dB headroom between operating level and clipping level. To change 0 VU level, see section on VU Meter Adjust- ment. VU Lamp Illuminates meter while button is depressed; automati- cally turns off 5 seconds after release to prevent bat- tery drain. Tape Outputs 3.5 mm jack to feed unbalanced Aux-level input of tape recorder or amplifier. Tip of connector in phase with pin 3 of XLR connectors. Telephone Lines In Line position, output transformer will operate with dc-biased "dialed up" telephone lines although there may be slight increase in distortion. When connecting FP31 to telephone line, use FCC-Registered* inter- face adapter between mixer and telephone line. 'DOC-Certified in Canada Condenser Microphone Power Condenser microphones, either 12 to 18 Vdc phantom (simplex) powered or 9 Vdc A-B(T) powered, can be supplied from any Mic input of FP31. Below batteries, inside battery compartment, are three 3-position switches. Center position is for dynamic microphones (no dc power supplied to Mic input); left position is for 9-Vdc A-B power, right position is for 11 - to 18-Vdc phantom power. NOTE: No power is supplied to any input with LineJMic switch in Line position. No A-B power is supplied un- less right-side battery is present. Mixer Powering In ordinary portable use, the FP31 is powered by two standard 9-Vdc alkaline batteries installed in leftmost