Shure FP24 User's Manual
Contents
1. ers Tip Left Ring Right Sleeve Ground Tape Return Level Conirol Recessed potentiometers adjust Tape Return level feeding the Headphone Monitor Limiter Switch Activates input peak limiter ON position functions as a dual mono limiter with each input signal controlling its own limit er LINK functions as a stereo limiter with both left and right inputs controlled simultaneously Center position of switch turns limiters off Limiter Threshold Level Control Recessed potentiometers adjust peak level of limiter activa tion Can be independently controlled for each input Output Panel Connectors TAPE RTN L 2 R LINE OUTPUTS N J Figure 3 Side Output Panel Operational Notes Input Transformers The FP24 uses premium Lundahl input transformers with pre mium magnetic core material to achieve high signal handling capa bility flat frequency response and minimum distortion Because these transformers provide galvanic isolation from the driving source they offer superior isolation from the adverse and uncon trolled environments of field production Their high common mode impedance also provides exceptional common mode rejection Output Circuitry and Tape Output Each line level XLR output of the FP24 uses a discrete six tran sistor mpedance balanced output stage The circuit uses over sized high speed transistors to achieve low distortion robust line driving capability Pin 2 is driven with s2. sources Tip left ring right sleeve ground 3 Left and Right Line Level Outputs Active balanced XLR line level outputs 22 dBu peak out put level Pin 2 hot pin 3 cold pin 1 ground Pin 3 can be grounded or ungrounded to drive unbalanced inputs 4 Battery Compartment Houses two AA batteries Insert positive end of batteries first 5 External DC Power Input Accepts 5 14 VDC from an AC to DC transformer or a bat tery supply Locking threaded coaxial connector Center pin positive sleeve negative Use the supplied threaded connector for power supplies with plug type con nectors such as the Shure PS20 See Figure 5 for wiring diagram Phantom Power Use one of the two phantom power settings on the FP24 for mi crophones that require it Some microphones need the 48 Volt set ting to avoid a loss of headroom and increased distortion The 15 Volt setting however lengthens battery life and electret con denser microphones rated for operation at 15 V or less generally receive no performance benefit from the 48 Volt setting Consult your microphone documentation for phantom power requirements Dynamic microphones do not require phantom power A properly connected balanced dynamic microphone is not affected by the presence of phantom power and does not draw any current How ever poorly or incorrectly wired microphone cable can cause audi ble artifacts in the microphone signal phantom power can be an exce
3. 0000 A O 13 30 15 0 4 8 12 16 POWER rOO00000 FP24 IkHz METER aL cm gt 12 LCR LCR SLATE O Soa PHONES INT EXT 3 5 7 8 Figure 1 Front Panel 1 Input Gain Controls Sealed conductive plastic rotary potentiometers 2 Input Peak Limiter LEDs Dual color LED illuminates red at 3 dB below clipping illumi nates amber to indicate limiter activity 3 L C R Switches Input Assignment Three position switch assigns inputs to Left Center both left and right or Right outputs 4 Slate Microphone Condenser microphone with AGC activated by momentary Slate Microphone Switches Slate Microphone output ap pears at all outputs 5 Tone Oscillator Slate Microphone Switch Toggle switch activates 1 kHz tone oscillator when switched to the left position and activates the slate microphone when momentarily moved to the right position Microphone inputs are muted when Tone Oscillator or Slate Microphone are activated 6 Output Meters Indicates peak output level in dBu 7 Meter Brightness Control Three position switch adjusts the intensity of illumination of the output meter low illumination normal illumination or super bright illumination Input Panel Connectors and Controls ON THRESHOLD MITER 1 2 3 6 Figure 2 Side Input Panel 1 Mic Inputs Transformer balanced XLR inputs accept microphone level signals Pin 2 hot Pin 3 cold Pin 1 ground NOTE You can use Shure A15LA line adapt
4. 8 dBV minimum 150 ohm source flat weighting 22 Hz 22 kHz bandwidth gain control set at 50 or higher phantom power off Input Clipping Level 10 dBu minimum Output Clipping Level Line 22 dBu minimum with 100k ohm load 20 dBu minimum with 600 ohm load Tape 11 dBu 2 75 V RMS minimum with 100k ohm load Dynamic Range 110 dB minimum THD Noise 0 05 maximum from 50 Hz to 22 kHz 4 dBu output level 22 Hz 22 kHz filter bandwidth gain control at 50 phantom off Common Mode Rejection Ratio 100 dB minimum at 80 Hz 60 dB minimum at 10 kHz Channel Separation Greater than 80 dB at 1 kHz gain controls set to 50 Inputs Transformer balanced 2k ohm input impedance Outputs XLR Active impedance balanced 120 ohm output impedance Tape 3 5 mm 1 g in Unbalanced tip left ring right sleeve ground 2 4k ohm output impedance High Pass Filters 80 Hz or 160 Hz switch selectable 6 dB per octave Phantom Power 15 V through 680 ohm resistors or 48 V through 6 8k resistors switch selectable Limiter Thresholds independently adjustable from 6 dBu to 18 dBu 10 1 limiting ratio 5 ms attack time 100 ms release time Amber Red LED indicates limiting clipping Dual mono or stereo linked Internal Voltage Rails 15 V and 15 V regulated Metering 7 segment GaN Gallium Nitride meter with 3 intensities Peak responding Power Internal 2 AA batteries External 5 14 VDC via thre
5. Bus Interconnect Cable Positive Solder to center pin marked with a white stripe on PS20 cable I m C Negative Solder to sleeve Figure 5 Attaching the Supplied Threaded Power Connector Certification Authorized under the DECLARATION OF CONFORMITY provision of FCC part 15 as a Class B digital device Tested to comply with FCC standards FOR HOME OR OFFICE USE This product complies with part 15 of the FCC rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation Changes or modifications not expressly approved by Shure Incorporated could void your authority to operate this equipment This equipment has been tested and found to comply with the limits for a class B digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on
6. Model FP24 User Guide Microphone Mixer General Description The Shure FP24 is a studio quality two channel portable stereo microphone mixer With assignable L C R inputs built in slate mi crophone 1 kHz tone oscillator and headphone monitor the FP24 is extremely flexible Its impressive audio performance and com prehensive features make it suitable for the front end of any studio or field production system Radio television and film production engineers will especially value its compact size sunlight readable LEDs and rugged mechanical and electrical construction that make it able to withstand extremes in the field Features High Performance Microphone Inputs e Maximum of 66 dB of gain each input e Premium Lundahl input transformers provide superior audio quality and freedom from interference problems e Sealed conductive plastic potentiometers for long life and reliable gain adjustment e Phantom power selectable between 48 volts and 15 volts e Switchable low cut filters with 80 and 160 Hz corner frequencies 6 dB per octave Filters are inserted prior to any active circuitry to maximize headroom e Inputs assignable to Left Center both left and right or Right Audio Performance e Dynamic range exceeding 110 dB e 10 Hz to 50 kHz audio bandwidth e Exceptionally low distortion characteristics e Discrete 6 transistor balanced output drivers provide signal integrity over long cable runs 2005 Shure I
7. SLATE position right is a momentary switch position that activates the built in slate microphone located behind the front pan el When the switch is held to the right all inputs are muted and slate mic signal is sent to all outputs The slate mic circuit contains an AGC automatic gain control to keep the slate level relatively constant regardless of the acoustic level Use the slate microphone to document takes right at the mixer location when microphones are on talent or away from the production mixer Metering and Clip Indicators Three two color clip indicators monitor signal levels throughout the FP24 1 Above each input gain control a two color LED glows red 3 dB below clipping This clip circuit monitors both the front end gain stage and the variable gain stage 2 A headphone clip LED located above the headphone level control indicates when either channel of the headphone cir cuit approaches clipping 3 The headphone clip LED also indicates when either channel of the tape return audio is near clipping When the limiter is activated these input LEDs glow amber in proportion to the amount of limiting The FP24 has a seven segment LED output meter that shows peak output level in dBu From left to right the first three LEDs are separated by 15 dB and the remaining LEDs are separated by 4 dB This calibration provides a 46 dB dynamic range with good resolu tion in the critical signal level range The meter uses premium G
8. aded coaxial connector 5 5 mm outer diameter 2 1 mm inner diameter Pin positive sleeve neg ative Voltages above 14 VDC cause no damage to unit but will open an internal poly fuse that will reset when voltage is re moved Threaded coaxial connector provided for use with power sup plies not equipped For instructions on how to solder this connec tor to a Shure PS20 see Figure 5 Power LED Dual color LED indicates following Green external DC power or good battery Red less than 1 hour of battery life remaining with phantom power off Polarity All inputs to all outputs non inverting Pin 2 of XLRs hot to unbalanced inputs and outputs Operating Temperature Range 0 to 70 degrees C 32 to 160 degrees F Dimensions 43 mm x 94 mm x 140 mm H x W x D 1 7 x 3 7 x 5 5 Weight FP24 only 0 8 kg 1 8 Ibs Weight packaged 1 2 kg 2 6 lbs EMC Certifications Meets FCC Part 15 Class B Emissions Eligible to bear CE mark see conformance statement Optional Accesories Balanced line level to microphone level in line adapter 0 cee eee eee ee A15LA FP33 FP24 Interconnection Kit 05 A33LK Inline Polarity Inverter 0 eee e eee eee A15PRS Front Panel Controls Connectors and ones 1 2 6 9 11 LOQO0O
9. allium Nitride GaN LEDs which are visible even in direct sunlight A three position switch on the front panel controls the brightness of the output meter Choose low nor mal or super bright CAUTION When set to super bright intensity the LEDs in the output meter can irritate or damage eyes with prolonged direct ex posure Power Sources and Battery Life The FP24 operates from either two internal AA alkaline cells or an external 5 14 VDC battery supply or AC to DC transformer such as the Shure PS20 The power connector is a locking threaded coaxial connector Center pin positive sleeve nega tive Use the supplied threaded power connector if necessary see Figure 5 The external DC input supply is galvanically isolated floating from the chassis and the rest of the circuitry The isolation provides trouble free interconnection to other pieces of equipment sharing the same DC power source The center pin of the locking DC con nector is positive and the sleeve is negative Since the external DC supply is floating the positive or the negative can be connected to the chassis with no adverse effects Two AA 1 5 Volt lithium cells can power the FP24 for up to approximately 11 hours However several factors affect how long a given pair of batteries will last These factors include battery chemistry ambient temperature use of phantom power output meter brightness and the output drive level of the FP24 The chart below pro
10. ch limiter has a two stage circuit the first stage keeps the input gain stage from clipping the second stage limits the variable gain stage according to the Limiter Threshold control set ting This unique two stage topology limits the gain stage directly after the mic input transformer without changing the input imped ance as other at the mic limiters do The circuit enables the FP24 to limit in excess of 50 dB making it very difficult to clip the unit re gardless of the gain setting The FP24 s limiters can operate in either either dual mono or ste reo Use the three position switch on the input panel to set the limit ing mode e In the middle position the limiters are turned off e In dual mono operation ON switch position the limiters work independently responding only to their input signals e In stereo linked operation LINK switch position the limiters control both channels identically This maintains a stable stereo image When the limiters activate the Peak Limiter LED on the front panel illuminates amber in proportion to the amount of limiting for each channel Tone Oscillator and Slate Microphone The switch labeled 1 kKHz SLATE on the front panel controls two functions The 1 kHz position left mutes all inputs and sends a 1 kHz sine wave calibration tone at 4 dBu to all outputs The tone oscillator can be used to verify connections and set nominal levels on recording and transmission equipment The
11. ers to con nect balanced line level sources to these inputs 2 Phantom Power Three position switch selects either 48 Volt or 15 Volt phan tom power for both inputs Center position turns phantom power off 10 11 12 13 Tape Return Switch Toggle switch allows external audio to be monitored in the headphones The center position is FP24 program audio The left and right positions monitor tape return audio the left position is locking and the right position is momentary Headphone Connector For stereo and mono headphones with 1 4 connectors Headphone Volume Control Headphone Peak LED llluminates 3 dB before clipping of either channel of the headphone circuit and either channel of Tape Return audio Power Switch Three position switch selects the power source The unit is powered from internal batteries when in the left position powered from external DC source when in the right position Center position is off Power LED Two color LED illuminates green when the unit is powered and changes to red when batteries require changing For external DC the power LED is always green High Pass Filter Switch Three position switch selects 80 Hz or 160 Hz corner fre quency filters 6 dB per octave Filters affect both inputs Center position of switch removes filters from the signal path Tape Output 3 5 mm g in TRS stereo output unbalanced can be used to feed consumer level DAT MiniDisc and CD record
12. ignal and pin 3 is not A common misunderstanding is that a balanced output refers to equal and opposite signals on pins 2 and 3 Correctly impedance balanced refers to equal impedances from pins 2 and 3 to ground not equal signal voltages To drive unbalanced inputs pin 3 can be grounded or left unconnected There is no change in signal level driving balanced or unbalanced inputs The FP24 s tape output feeds consumer level devices such as computer sound cards DAT or MiniDisc recorders and cassette recorders A cable wired with 3 5 mm g in TRS to 3 5 mm 1 8 in TRS or 3 5 mm 1 g in TRS to Left Right phono RCA connec tors will connect the FP24 to such devices Using the FP24 as a Mixer The FP24 can be used as a simple two channel mixer Possible applications include e Quickly reversing the stereo image of a recording without reconnecting inputs or outputs e During set up checking for mono compatibility by assigning both inputs to the same output e Recording dialog in mono e Performing mix minus by routing Input 1 to Center and Input 2 to Right Asummed mono signal of both inputs appears at the Right output while only Input 1 appears at the Left output This is useful for post production processing of Input 1 audio 1 Strap Slot Attachment point for camera straps 2 Tape Return Input Connector 3 5 mm 1 g in TRS stereo unbalanced input for head phone monitoring of external audio
13. ired operation Testing was completed by the following NVLAP or A2LA accredited laboratory L S Compliance Inc W66 N220 Commerce Court Cedarburg Wisconsin 53012 Telephone 262 375 4400 Fax 262 375 4248 Shure Incorporated Manufacturer Signed f Date Sept 15 2000 Name Title Craig Kozokar Project Engineer EMC SHURE SHURE Incorporated Web Address http www shure com 5800 W Touhy Avenue Niles IL 60714 4608 U S A In U S A Phone 1 847 600 2000 Fax 1 847 600 1212 In Europe Phone 49 7131 72140 Fax 49 7131 721414 In Asia Phone 1 852 2893 4290 Fax 1 852 2893 4055 International Fax 1 847 600 6446
14. llent cable tester It is good practice to turn phantom power off when not needed High Pass Filter To remove excess low frequency energy in the audio signal use either of the two high pass low cut filter settings on the FP24 Use the 80 Hz position for most applications such as recording speech music and ambient sound The 160 Hz position is useful for en hancing speech clarity and reducing wind noise The high pass fil ter is a single pole design 6 dB per octave When possible equalize at the sound source by microphone selection placement use of a windscreen and onboard micro phone filtering Using both the high pass filter on the FP24 and the one on a microphone has an additive effect increasing the overall slope of the roll off Headphone Monitoring and Tape Return The three position Tape Return switch on the front panel selects the audio source being monitored Center Position Program audio normal operation Monitors the Left and Right outputs of the FP24 Left and Right Positions Secondary audio source Monitors audio from the Tape Return input of the FP24 Can be used to verify that signal is reaching cameras and tape machines Left is locking right is momentary Important The FP24 can drive headphones to very high levels Exercise care when monitoring Reduce the level when the Head phone Peak LED illuminates Limiters The FP24 has two built in peak responding limiters one for each input channel Ea
15. ncorporated 27A8727 Rev 1 Headphone Monitoring e Switchable between program audio or external stereo tape returns e High current headphone output has level control and peak indicator Level Metering e Dual color LEDs indicate clipping and limiter activity for each channel e Sunlight readable seven segment GaN LED output meters e 3 position LED brightness switch intensity selector Audio Limiters e Unclippable input peak limiters with adjustable limiter threshold each input e Dual mono or linked stereo limiter operation Flexible Powering e Internal power from two AA batteries with easy access battery compartment e Chassis isolated 5 to 14 VDC input for easy external DC powering e Power LED indicates low battery power Trouble Free Design e High strength extruded aluminum chassis with protective metal end panels withstands punishing field conditions e All metal connectors mount directly to the chassis for durability and RF immunity e Free from Pin 1 grounding problems e RF filtering on all inputs and outputs D CE Printed in U S A Specifications Gain Mic Input to Output per channel continuously variable Output Gain Range LINE oo 66 dB TAPE oo 56 dB Frequency Response 20 Hz 30 kHz 0 2 0 5 dB 1 dB at 5 Hz 50 kHz relative to 1 kHz level with 150 ohm source gain controls set at 50 Equivalent Input Noise 126 dBu 12
16. ophones e 48 volt phantom power for all five microphone inputs e Limiters on the FP24 inputs e Input assignment switches on the FP24 and pan pots on the FP33 inputs e Two output buses assignable to mic or line level output e Master volume and headphone monitoring for all five inputs controlled from the FP33 e Compact FP24 adds little bulk to an existing FP33 package e The FP24 s isolated external DC input jack eliminates ground related interference problems NOTE When interconnecting the FP24 and FP33 inputs from the FP24 appear at the FP33 mixbus with their polarity reversed This is unavoidable due to the nature of the interconnection To avoid cancellation or interference effects e g comb filtering be tween the signals from the FP24 and FP33 inputs use Shure A15PRS polarity inverters on the FP24 inputs or do one of the fol lowing e Keep microphones connected to the FP24 as far away as possible from those connected to the FP33 e For microphones that must be close together such as those in a stereo pair connect them to the same mixer NOTE If constructing your own FP24 FP33 interconnect cable e Keep cable length to a minimum since the interconnection is unbalanced e Be sure to drive the FP33 mix bus off of pin 2 of the FP24 since the FP24 inputs are reverse polarity with respect to FP33 inputs FP24 XLR L sodh FP33 mixbus 2 3 1 FP24 XLR R 1 C a 2 820 ohm Figure 4 FP24 FP33 Mix
17. repack the unit insure it and return it postage prepaid to Shure Incorporated Attention Service Department 5800 W Touhy Avenue Evanston Illinois 60714 4608 U S A Outside the United States return the product to your dealer or Authorized Service Center This warranty does not apply in cases of abuse or misuse of the product use con trary to Shure s instruction or unauthorized repair All implied WARRANTIES OF MER CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE are hereby disclaimed and Shure hereby disclaims liability for incidental special or consequential damages resulting from the use or unavailability of this product Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above limitation may not apply to you This warranty gives you specific legal rights and you may have other rights which vary from state to state FCC Declaration of Conformity We of Shure Incorporated 5800 W Touhy Avenue Evanston IL 60714 4608 U S A 847 600 2000 declare under our sole responsibility that the following product Model FP24 Name FP24 Microphone mixer preamplifier was tested and found to comply with Part 15 of the FCC rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received includ ing interference that may cause undes
18. the user is encouraged to try to correct the interference by one or more of the following measures s Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver e Connect the equipment into an outlet on a circuit different from that to which the receiver is connected 2 Consult the dealer or an experienced radio TV technician for help This class B digital apparatus complies with Canadian ICES 003 Eligible to bear CE marking Conforms to European EMC directive 89 336 EEC Professional Audio Products Standard EN 55103 1996 Part 1 emissions and Part 2 immunity The FP24 is intended for use in environments E1 residential and E2 light industrial as defined in European EMC standard EN 55103 It meets the applicable tests and performance criteria found in the standard for these environments EMC conformance is based on the use of shielded interconnecting cables N 108 Limited Two year Warranty Shure Incorporated Shure hereby warrants that this product will be free from de fects in materials and workmanship for a period of two years from date of purchase At its option Shure will repair or replace the defective product and promptly return it to you or refund the purchase price You should retain proof of purchase to validate the purchase date and return it with any warranty claim If you believe this product is defective within the warranty period carefully
19. vides estimates of battery life in different kinds of circum stances Experimentation can determine expected battery life for specific setups and environments NOTE AA carbon cells and AA nickel cadmium cells are not rec ommended for use in the FP24 since they have lower power capac ity than other types and will result in very short service life Battery Microphone Type and Battery Type FP24 Settings Life Eveready AA 2 dynamic handheld microphones low 11 hrs No L91 lithium meter brightness no headphones 2 dynamic handheld microphones low meter low headphone level ee 2 condenser 15 Volt phantom pow ered microphones normal meter in 4hrs tensity normal headphone level Duracell AA MN 1500 alkaline 2 studio condenser 48 Volt phantom powered microphones super bright 2 hrs meter intensity high headphone level Test conditions 70 degrees F 42 dB of gain with an acoustic music source 600 ohm load 4 dBu output Interconnecting the FP24 and FP33 You can connect the balanced line level XLR outputs of the FP24 to the mix bus of the FP33 using the Shure A33LK accessory kit or construct a cable assembly as shown in Figure 4 on the fol lowing page Combining an FP24 and a Shure FP33 or FP32A mixer yields a flexible cost effective 5 X 2 field mixing setup with the following features e Simultaneously accepts a stereo microphone hard wired shotgun and two RF lavalier micr
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