ProAudio Review - April 2008 - (Page 31)

BENCH TEST KRK Exposé E8B Studio Monitor BENCH MEASUREMENT DATA Frequency Response On-axis 90 Hz to 20 kHz +/- 6.7 dB Bass Limit 71 dB SPL @ 62 Hz @ 2 meters ( 10 kHz Actual Response +1.1 dB to -2.0 dB > 8 kHz LF Level Half dB Steps +1.0 to -2.0 dB > 1.9 kHz Actual Response +0.8 dB to -2.6 dB >1.9 kHz LF Adjust -3 dB @ 45 Hz; Actual Response 90 Hz -3 dB @ 65 Hz: Actual Response 103 Hz -3 dB @ 50 Hz: Actual Response 117 Hz BENCH MEASUREMENT COMMENTARY The Bass Limit of the speaker is the Sound Pressure generated at 2 meters in a 7600 cubic foot room with less than 10% distortion. The 10% distortion limit is used because operating characteristics of drivers (using DLC Design DUMAX) shows that when a speaker has reached the end of its linear operating range (BL product has fallen to 70% of the rest position value or the suspension compliance has stiffened by a factor of 4) the unit will still sound clean, but distortion increases exponentially with further drive. However, port and suspension noise and with powered speakers amplifier output or limiting may also constrain sound pressure capability. Basic measurements here have been taken at a full 2 meters in a large room on a 6-foot stand. Using time windows gives equivalent anechoic results above 200 Hz including front panel reflections and cabinet diffractions. Overall results give true acoustical summation of all drivers and passive radiating elements. The E8B has less low frequency extension and dynamic capability than the large and relatively heavy cabinet and specifications would lead one to believe. The Low Frequency Adjust function has a curious effect when the switch is set to -3 dB @ 50 Hz; unlike the 65 and 45 Hz settings, response begins falling below 300 Hz and is less than half power by 117 Hz. The high frequency controls are reasonably close to marked action, which serves to make them easy to use, but the limited range probably makes them less useful overall than one might think. Directivity is well controlled but the frequen- cy response basic shape has some obvious errors; the largest of these are a large +10 dB peak centered on 14.8 kHz and a 4 dB bump between 700 Hz and 1.1 kHz. — Tom Nousaine www.proaudioreview.com April 2008 | ProAudio Review | 31 http://www.adkmic.com http://www.adkmic.com http://www.proaudioreview.com

Table of Contents Feed for the Digital Edition of ProAudio Review - April 2008

ProAudio Review - April 2008 Contents A Little More Recognition Please Studio News and New Products API 1608 16-Channel Analog Console TASCAM X-48 Digital Audio Workstation SSL Matrix Super Analogue Console Toft Audio Design Series ATB Analog Console KRK Systems Exposé E8B Powered Monitor Broadcast News and New Products ZOOM H2 Portable Digital Recorder Producing Surround Sound at 50th Grammy Awards JBL LSR4312SP Linear Spatial Reference Powered Subwoofer Audio Production For Gaming Euphonix S5 Fusion Digital Post Production Console NAB Hot Gear Soundcraft Vi6 Digital Live Production Console Go To A Show! Contracting News and New Products Studio Consoles Studio Wireless Microphones Alicia Keys “Superwoman”

ProAudio Review - April 2008

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