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Related Manuals for Benchmark MPA1
Summary of Contents for Benchmark MPA1
- Page 1 Benchmark MPA1 Instruction Manual 2-Channel Microphone Preamplifier...
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Page 2: Safety Information
EQUIVALENT). Modifications CAUTION: DO NOT SUBSTITUTE PARTS OR MAKE ANY MODIFICATIONS WITHOUT THE WRITTEN APPROVAL OF BENCHMARK MEDIA SYSTEMS, INC. MODIFICATION MAY CREATE SAFETY HAZARDS AND VOID THE WARRANTY. NOTICE: CHANGES OR MODIFICATIONS NOT EXPRESSLY APPROVED BY BENCHMARK MEDIA SYSTEMS COULD... -
Page 3: Table Of Contents
RoHS Compliant Information Microphone Inputs (L and R) CE Certificate of Conformity Balanced XLR Outputs Warranty Information Output Signal Levels Driving Unbalanced Loads Benchmark Extended Warranty AC Power Entry Connector Calibration Fuse Holder +48V Adjustment Preamp Section Preamp Overview Microphone Gain Controls... -
Page 4: Overview
0 dB to 74 dB without using a pad. the Benchmark design one step further, and achieves the lowest IMD that we have ever Each channel of the MPA1 has an XLR direct measured in a microphone preamplifier. output. These outputs feature low-distortion, high-current drivers that easily handle long The MPA1 includes the HPA2™... -
Page 5: Features
HPA2™ “0-Ohm” 1/4” TRS Headphone Output • +23.5 dBu Maximum Headphone Output Level • 41-Detent Headphone Level Control • Ultra-Quiet Linear Power Supply with Rear-Panel Input Voltage Selector • Complies with FCC and CE Regulations • RoHS Compliant • MPA1 Instruction Manual Page 5... -
Page 6: Connections
2 or pin 3. The MPA1 is very well protected XLR pin 2 = + Audio Out against both of the above. For the protection... -
Page 7: Output Signal Levels
1. Connect XLR pin 2 (+) to Tip. range of 50 to 60 Hz. At the “110” setting, the MPA1 will operate normally over a range 2. Connect XLR pin 1 (GND) to Sleeve. of 105 to 140 VAC. At the “220” setting, the 3. -
Page 8: Preamp Section
Maximum gain is calibrated for exactly 74 dB. Minimum gain is 0 dB (unity). The MPA1 does not attenuate the signal with pads or otherwise. When the gain is set at 0 dB, the MPA1 can accept a signal at +27.5 dBu... -
Page 9: Phantom Power Switches
MPA1 is dedicated from either pin 2 or pin 3. The MPA1 is very to ribbon microphone. The purpose is to well protected against both of the above. For... -
Page 10: Led Output Level Meters
The yellow LED (+24 dBu) illuminates at an output level of at least +24 dBu. The red LED (+28 dBu) illuminates at an output level of at least +27.5 dBu. The red LED indicates a clip has occurred. MPA1 Instruction Manual Page 10... -
Page 11: Hpa2™ Headphone Output
The output of each channel’s preamp is Ohm headphone load are virtually identical. directed to the headphone amplifier, The HPA2™ will substantially improve the Benchmark’s signature HPA2™ headphone sound of 30 and 60-Ohm headphones. It will amplifier. This high-current, high-output make very noticeable improvements with amplifier has an output impedance of 0- 600-Ohm headphones. -
Page 12: Rack Mounting
MPA1 may be mounted directly above or below any other equipment, but we cannot (http://www.BenchmarkMedia.com), or contact your dealer to purchase these guarantee that the MPA1 will be impervious to accessories. interference from all equipment mounted too close to the MPA1. It is recommended that the user apply caution by using the following System1™... -
Page 13: Performance Graphs
Left HP Filter Off The above graph shows the frequency response of the MPA1 with the 40 Hz high-pass filter off. The amplitude response measures -0.020 dB at 10 Hz and -0.165 dB at 200 kHz. The bass response extends well below the 10-Hz limitation of the test equipment, and the high-frequency response extends well above the 200 kHz limit of the test equipment. -
Page 14: High-Pass Filter - Frequency Response
Data Axis Comment Solid Anlr.Level A Left HP Filter On The above graph shows the response of the 40 Hz high-pass filter. Response is -3 dB at 40 Hz with a slope of 12 dB/octave. MPA1 Instruction Manual Page 14... -
Page 15: Inter-Channel Phase Response
+0.5 +0.4 +0.3 +0.2 +0.1 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 100k This graph shows that the differential phase is significantly better than ± 0.05 degrees from 10 Hz to 20 kHz. MPA1 Instruction Manual Page 15... -
Page 16: Thd+N Vs. Frequency
50 dB Gain Blue Solid Anlr.THD+N Ratio Left 40 dB Gain Green Solid Anlr.THD+N Ratio Left 30 dB Gain (bottom trace) This graph shows that THD+N does not rise with frequency – even at maximum gain. MPA1 Instruction Manual Page 16... -
Page 17: Wideband Thd+N Vs. Frequency
30 dB Gain (bottom trace) This graph shows that THD+N does not rise above noise – even at very high frequencies. The 500 kHz measurement bandwidth elevates the noise by 28 dB relative to a 20 kHz measurement bandwidth. MPA1 Instruction Manual Page 17... -
Page 18: Equivalent Input Noise Vs. Gain
Equivalent Input Noise vs. Gain The above plot shows the Equivalent Input Noise (EIN) of the MPA1 as a function of gain. Measurement bandwidth is 20 Hz to 20 kHz. Input termination is 150 Ohms. MPA1 Instruction Manual Page 18... -
Page 19: Noise Spectrum
*-149.014 dBr A The above graph demonstrates that the MPA1 is free of hum and noise. The highest tone is 60-Hz line-related hum and is at a level equivalent to an input level of -145 dBu. 180-Hz hum is at an equivalent input level of -149 dBu. -
Page 20: Thd Spectrum At 1 Khz
*-111.404 dBr A *-122.747 dBr A The above FFT plot shows that the MPA1 has very little harmonic distortion. The 1 kHz test tone is notched out with a THD analyzer to improve the resolution of the test. Distortion is exceptionally low. -
Page 21: Thd Spectrum At 10 Khz
*-118.787 dBr A The above FFT plot shows that the MPA1 has very little harmonic distortion at high frequencies. The 10 kHz test tone is notched out with a THD analyzer to improve the resolution of the test. The 20- kHz 2 -harmonic distortion measures better than -109 dB. -
Page 22: Specifications
-108 dB, 0.00038% at 40 dB Gain -101 dB, 0.00085% at 55 dB Gain IMD (50Hz and 7 kHz, to any output at +24 dBu) -104 dB, 0.0006% at 35 dB Gain -104 dB, 0.0006% at 40 dB Gain MPA1 Instruction Manual Page 22... -
Page 23: Direct Outputs
Overload Protection (independent per channel) Current limited at 300 mA Thermal Shutdown Bandwidth > 500 kHz -0.014 dB at 10 Hz -0.013 dB at 200 kHz THD+N -106 dB, 0.0005% into 30 Ohms at +18 dBu (1.26 W) MPA1 Instruction Manual Page 23... -
Page 24: Led Output Meters And Gain Indicators
220 V setting : 200 V min, 285 V max Frequency 50-60 Hz Power 27 Watts Idle 27 Watts Typical Program 35 Watts Maximum Fuses 5 x 20 mm (2 required) 0.5 A 250 V Slo-Blo® Littelfuse® HXP218.500 or Equivalent MPA1 Instruction Manual Page 24... -
Page 25: Dimensions
Width excluding 19” rack ears 9.5” (249 mm) Height excluding removable feet 1.725” (44.5 mm) Weight MPA1 only 3.5 lb. MPA1 with power cord, extra fuses, and manual 4.5 lb. Shipping weight 7 lb. MPA1 Instruction Manual Page 25... -
Page 26: Regulatory Compliance
(European Union) directive 2002/95/EC, or, RoHS (Restrictions of Hazardous Substances). As of July 01, 2006, All Benchmark Media Systems, Inc. products placed on the European Union market are compliant (containing quantity limit weight less than or equal to 0.1% (1000 ppm) of any homogeneous Lead (Pb), Mercury (Hg), Hexavalent Chromium (Cr VI), and flame retardant Polybrominated Biphenyls (PBB) or Polybrominated Diphenyl Ethers (PBDE)). -
Page 27: Ce Certificate Of Conformity
CE Certificate of Conformity MPA1 Instruction Manual Page 27... -
Page 28: Warranty Information
In the event of failure of a product under this warranty, Benchmark Media Systems, Inc. will repair, at no charge, the product returned to its factory. Benchmark Media Systems, Inc. may, at its option, replace the product in lieu of repair. -
Page 29: Benchmark Extended Warranty
Benchmark Extended Warranty The Benchmark Extended 5* Year Warranty Benchmark Media Systems, Inc. optionally extends the standard one (1) year warranty to a period of five (5)* years from the date of delivery. *For the extended warranty to become effective, the original purchaser must register the product at the time of purchase either by way of the prepaid registration card or through the product registration section of the Benchmark Media Systems, Inc. -
Page 30: Calibration
CAUTION: ROUTINE CALIBRATION SHOULD NOT BE REQUIRED. THE FOLLOWING PROCEDURE SHOULD ONLY BE USED BY A QUALIFIED TECHNICIAN. This procedure will restore the MPA1 to factory calibration if controls have been moved from factory settings. +48V Adjustment 1. Using a DC voltmeter, measure the voltage across D23 and adjust “+48V...