Limiter Operational Notes The limiter switch on the front panel activates two peakresponding limiters within the FP23. The first acts on the input signal, while the second one limits the output to +17 dBu. This enables the FP23 to limit in excess of 50 dB, making it very difficult to clip the unit, regardless of the gain setting. The limiter LED on the front panel illuminates in proportion to the amount of limiting. Transformers The FP23 uses input and output transformers with premium magnetic core material to achieve high signal handling capability, especially at low frequencies. This keeps distortion to a minimum. Transformers offer superior isolation from the adverse and uncontrolled environments of field production. Unlike other balancing techniques, transformers “transform” signals magnetically without any direct electrical connection, providing complete galvanic isolation from the driving source. And their inherently high common mode impedance provides exceptional common-mode noise rejection. Batteries Two AA alkaline cells can power the FP23 for approximately 26 hours (with typical signals, phantom power OFF). The audio performance of the FP23 does not vary throughout the life of the batteries. Many factors affect battery life, including battery chemistry, ambient temperature of operation, phantom voltage, microphone current draw, and output drive level. Use the chart below to estimate battery life. Experimentation can help determine the battery life for each individual setup. Balanced and Unbalanced Connections Both the input and output of the FP23 accept balanced or unbalanced connections. You can convert either the input or output to unbalanced operation by grounding pin 3 to pin 1. No change in gain will occur. NOTE: Nickel-Cadmium batteries are not recommended. These batteries have lower energy per cell than other types and result in very short service. Phantom Power Use one of the two phantom power settings on the FP23 for microphones that require it. Some microphones need the 48-volt setting, or they will suffer a loss of headroom and an increase in distortion. The 12-volt setting, however, lengthens battery life, and electret-condenser microphones rated for operation at 12 V or less generally receive no performance benefit from the 48-volt setting. Consult your microphone documentation. Battery Type Duracell AA MN 1500 Duracell AA MN 1500 Duracell AA MN 1500 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. However, poorly or incorrectly wired microphone cable can cause audible artifacts in the microphone signal (phantom power can be an excellent cable tester). It is good practice to turn phantom power off when not needed. Microphone Type Dynamic handheld Battery Life 26 hrs. Electret condenser, 12-volt phantom Studio condenser, 48-volt phantom 18 hrs. 5 hrs. (Test conditions: 70 degrees F, 42 dB of gain with an acoustic music source, 600 Ω load, +4 dBu output) High Pass Filter Use either of the two high pass (low cut) filter settings on the FP23 to remove excess low frequency energy in the audio signal. Use the 80 Hz position for most applications, such as recording speech, music, and ambient sound. The 160 Hz position is useful for enhancing speech clarity. The high pass filter is a single pole design, 6 dB per octave. When possible, equalize at the sound source with microphone selection, placement, use of a windscreen, and onboard microphone filtering. A high pass filter on the microphone and a high pass filter on the FP23 gives an additive effect, increasing the slope of the filter. 3 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, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected 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 FP23 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 One-year Warranty Shure Incorporated (“Shure”) hereby warrants that this product will be free from defects in materials and workmanship for a period of one year from the 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 repack the unit, insure it, and return it postage prepaid to: Shure Incorporated Attention: Service Department 222 Hartrey Avenue Evanston, Illinois 60202-3696 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 contrary to Shure’s instruction, or unauthorized repair. All implied WARRANTIES OF MERCHANTABILITY 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 222 Hartrey Ave. Evanston IL 60202–3696 U.S.A. 847–866–2200 declare under our sole responsibility that the following product, Model: FP23 Name: FP23 Microphone 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, including interference that may cause undesired 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: Date: May 15, 2000 Name, Title: Craig Kozokar, Project Engineer, EMC SHURE Incorporated Web Address: http://www.shure.com 222 Hartrey Avenue, Evanston, IL 60202–3696, U.S.A. Phone: 847-866–2200 Fax: 847-866-2279 In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414 In Asia, Phone: 852-2893-4290 Fax: 852-2893-4055 Elsewhere, Phone: 847-866–2200 Fax: 847-866-2585 4