Electro-Voice PL4 User's Manual
Contents
1. gutan company Model PL4 Miniature Electret Condenser Omnidirectional Microphone DESCRIPTION AND APPLICATIONS The model PL4 is a miniature omnidirectional condenser microphone packaged with power supply buffer instrument mounting clin and microphone cable The PL4 was de by the professional m to provide urate high quailty sound reinforcement for acoustic instruments The microphone and instrument clip s small physica size is ideal for on stage in studia or on camera use The PL4 s frequency response Is tailored to provide a full range well balanced sound character with ultra low distortion for clean and accurate sound reproduction see Figure 3 An important feature of the PL4 is the buffered second order bass cut off active filter housed inside the power supply buffer module This tilter cuts off energy below 80 Hz reducing undesirable sounds such as rumble or wind noise The PL4 is supplied with a specially designed instrument mounting clip and power supply buffer module The instrument mounting clip see Figure 2 clasps onto the sound hole on an acoustic instrument or is attached onto the bell of a horn The clip s pads are made of a soit elastomer which will not harm the surface of the instrument The instrument Mounting cio allows the musician to position the microphone for obtaining the best sound character of the individual instrument The microphone element is attached to the power supply2. parallel unserrated jaws clamp the wires then shape the clamp to form the appropriate angle To demonstrate the versatility and provide direction to the user for mounting the PL4 instrument microphone a series of engineer ing tests were conducted The tests consisted of positioning the microphone on a guitar at different distances from the sound hole see Figure 5 An Ovation guitar mode 1112 4 was tuned open G tuned to DGDGBD and played unfretted The output of the microphone was analyzed by a FFT analyzer Fast Fourier Transform The FFT analyzer displays the amplitude and frequency response of a complex signal Refering to Figure 7 notice that by moving the PL4 closer to the sound hole the bass energy raises at a faster rate than the mid or treble frequencies Positioning the microphone further from the sound hole will reduce the low frequency energy The microphone placement illustrated was selected only to demonstrate what can be DIRECTION TO INCREASE BASS FIGURE 5 Typical Placement on Acoustic Guitar FIGURE 6 Shaping the Instrument Mounting Clip 1 FROM SOUND HOLE 3 FROM SOUND HOLE RESPONSE IN dB FREQUENCY RESPONSE FIGURE 7 Response Mounted on Guitar Soundboard achieved by experimentation PL4 users are encouraged to experiment with different microphone placements or multiple microphone placement Undoubtedly that unique microphone placement will be discove
3. SPECIFICATIONS Element Electret condenser Frequency Response see Figure 3 80 15 000 Hz Impedance 150 ohms nominal balanced Polar Pattern Omnidirectional Output Level 45 cB ret 0 dB 1mW 10 dynes cm 4 36 mV Pasca 1 kHz S N Ratio 72 dB A weignted Dynamic Range 117 dB 141 dB input open circuit Equivalent Noise Level Less than 24 dB re 0002 dyne cm Maximum SPL at 1 THD 141 dB SPL at 1 kHz Operating Voltage 9 Vdc internal transistor radio battery Not supplied See Replacement Guide 18 50 V de phantom power Current Required 3 9 MA maximum Output Cable 2 44 meters 8 feet two conductor shielded black rubber jacketed with TASF and A3M connectors Case Material Mike Capsule Brass Electronic Housing Aluminum Power Supply Buffer Steel with plastic cover Connections See Figure 4 Dimensions See Figure 1 Finish Mike Capsule Electronic Housing Assembly Non reflecting grey Power Supply Buffer Assembly Nickle plated with black plastic cover Weight Mike Capsule Electronic Housing Assembly 19 grams Power Supply Buffer Assembly 120 grams less battery Furnished Accessories 385 windscreen Belt clip Storage pouch Instrument mounting clip Optional Accessories 22 extension miniature interconnect cabie 10 ft long AC24M power supply CO9R The CO94 is a field replacement for the microphone capsule electronics and cable ElectroVoice a
4. aintain tne required 3 9 mA When operating the PL4 in the phantom mode the switch located on the power supply buffer module s front surface functions as a silent muting switch see Figure 4 If desired the PL4 can be operated in a dual mode employing both battery and phantom powering The advantage of this configura tion is the insurance against loss of signal should the phantom power fail When phantom voltage is present the battery Is deactiviated however should the phantom voltage fail the battery will automatically power the power supply buffer module A shorted battery or a shortened phantom supply assuming the short is to ground and not across the output leads will not affect the operation of the PL4 on the remaining power source OPERATING INSTRUCTIONS To prepare the PL4 for operation in the battery mode first slide the black cover forward and then install a fresh 9 volt battery in the exposed compartment Slide the cover rearward until a slight click is felt Plug the microphone element assembly into the power supply buffer module An extension cable up to 25 feet long can be used if desired Plug the output cable into the connector on the power supply buffer module front panel Slide the switch to the ON position The PL4 should now operate properly If the PL4 should fail to operate check the battery voltage and verily the seating of the connectors PHANTOM POWERED OPERATION To prepare the PL4 for phant
5. buffer by a 6 toot 1 8 meter 63 5 mm 2 50 in 25 4 mm c 54 0 mm 3 1 0 in 2 125 in FIGURE 1 Dimensions Instrument Mounting Clip FREQUENCY IN HERTZ FIGURE 3 Frequency Response TRANSDUCER SHILLD FIGURE 4 Wiring Diagram length of durable miniature cable This cable is connected to the power supply bufler module with a miniature connector permitting the use of cable extensions The power supply buffer is normaily clipped to the user s belt utilizing the attached clip The PL4 has superior dynamic range greater than the typical electret lavaliers utilized in an instrumental application A PL4 is typically 10 dB greater in sensitivity than conventional electret lavaliers and will accept 20 dB greater input SPL before overload Due to the PL4 s superior signal to noise ratio and headroom the mircrophone can be used in demanding recording and sound reinforcement applications where other miniature lavalier electrets would fail POWERING THE PL4 The PL4 can be powered in several ways depending of course on the application The PL4 will operate trom a 9 volt battery located in the power supply buffer module In this mode the switch located on the power supply buffer module s front surface functions as an on off switch The PL4 can also operate on any of the currently used phantom power systems employing voltages from 18 to 50 volts dc The series resistances shouid m
6. ird circuit is the power supply which supplies either battery or phantom voltage to power the microphone WARRANTY Limited Electro Voice Professional PL amp BK Series Microphones excluding the Mode PL88 are guaranteed against malfunction from any cause for a period of two years from date of Original purchase Also these microphones excluding the Mode PL88 are guaranteed without time limit against malfunction in the acoustic system due to defects in workman ship and materials Any active electronics incorporated in the microphone are guaranteed for three years from date of original purchase for parts and labor against such malfunction If such malfunction occurs microphone will be repaired or replaced at our option without charge for materials or labor if delivered prepaid to the proper Electro Voice service facility Unit will be returned prepaid Warranty does not extend a QUIN company TR146X E146X H146X 1604M to finish appearance items cables cable connectors switches or malfunction due to abuse or operation under other than specified conditions nor does it extend to incidental or consequential damages Some states do not allow the exclusion or limitation of incidental or consequential damages so the above exclusion may not apply to you Repair by other than Electro Voice or its authorized warranty service agencies will void this guarantee A list of authorized warranty service centers is availabie f
7. om powered operation plug the microphone element and output cables into the power supply buffer module Slide the front panel switch on the power supply buffer module to the ON position lf the output cable is connected to equipment providing phantom power the unit will operate properly If correct operation does not occur check the phantom power supply source MICROPHONE MOUNTING INSTRUCTIONS The instrument mounting clip is constructed ot a stainless steel wire form with protective plastic sleeving elastamer microphone mount and pressure pad The rear pressure pad incorporates a cable strain relief This strain relief allows the performer to dress the cable out of harms way The instrument clip is designed to be positioned on any instru ment with an acoustic sound hole and is pre set to clamp to the average guitar sound board thickness see Figure 5 To clip onto the bell of a norn instrument the clip must be bent to clamp onto the more complex thin ner surface The instrument clip can be fashioned to locate the microphone at a position on the instrument which is found to be soncially pleasing The following steps will help in shaping the instrument clip for the particular instrument see Figure 6 for illustration First By experimentation find the location on the instrument which is the most sonically pleasing Second Determine how the clip is to be bent to position the microphone Third Utilizing a too with
8. red which is pleasing to the style and quality of the instrument TECHNICAL INFORMATION The PL4 can be separated into three major assemblies The microphone element assembly the power supply buffer assembly anc the instrument clamp assembly In a similar fashion the microphone element assembly can be divided into two subassemblies the microphone capsule subassembly and the electronics and cable subassembly The microphone capsule houses the omnidirectional electret condenser element The capacitance of this element changes in response to sound pressure variations occurring at the diaphragm These changes in capacitance are converted to a usable output voltage by the electronics subassembly Electrical connection to the electronics subassembly is accomplished through a probe which extends from the electronics assembly into a recess on the back of the microphone capsule The microphone electronics assembly is connected to the power supply buffer assembly via a TA 3M connector The power supply buffer houses the electronic circuitry that provides three functions to operate the PL4 The first circuit is the buffer circuitry that interfaces the microphone element tc the BATTERY REPLACEMENT GUIDE Alkaline Mallory MN1604 Eveready 522 Burgess 2NG NEDA 1604A mixer console The second the high pass filter is a 12 dB per octave active filter which provides bass roll off The designed break frequency for the filter is 80 Hz The th
9. rom Electro Voice Inc 600 Cecil Street Buchanan MI 49107 AC 616 695 6831 Electro Voice Inc 3810 148th Avenue N E Redmond WA 98052 AC 206 881 9555 and or Electro Voice West 8234 Doe Avenue Visalia CA 93291 AC 209 651 7777 This warranty gives you specific legal rights and you may also have other rights which vary from State to state The Mode PL88 is guaranteed for two years from date of original purchase against malfunction due to defects in workmanship and materials Service and repair address for this product Electro Voice Inc 600 Cecil Street Buchanan Michigan 49107 Specifications subject to change without notice ELECTRO VOICE INC 600 Cecil Street Buchanan Michigan 49107 MANUFAC TURING PLANTS AT IB BUCHANAN AY E NEWPOR TN BD SEVIERVILLE TN BB REDMOND WA E GANANOQUE ONT Guto Induse tne 1985S laho in USA Pant Number 530565 523
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