Definitive Technology BP9080x Speaker System Review Test Bench

Test Bench

L/R Sensitivity: 91.5 dB from 500 Hz to 2 kHz

Center Sensitivity: 92.5 dB from 500 Hz to 2 kHz

Surround Sensitivity: 90 dB from 500 Hz to 2 kHz

L/R Elevation Section Sensitivity: 90 dB from 500 Hz to 2 kHz

A90 Elevation Module Sensitivity: 87.5 dB from 500 Hz to 2 kHz

This graph shows the quasi-anechoic (employing close-miking of all woofers) frequency response of the BP9080 L/R (purple trace), CS9080 center channel (green trace), BP9060 surround (red trace), BP9080 elevation section (blue trace), and A90 elevation module (aqua trace). All passive loudspeakers were measured with grilles at a distance of 1 meter with a 2.83-volt input and scaled for display purposes.

The BP9080’s listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +2.00/–1.99 decibels from 200 hertz to 10 kilohertz. The –3dB point is at 27 Hz, and the –6dB point is at 24 Hz. Impedance reaches a minimum of 4.76 ohms at 347 Hz and a phase angle of –42.42 degrees at 208 Hz.

The CS9080’s listening-window response measures +1.42/–2.61 dB from 200 Hz to 10 kHz. An average of axial and +/–15-degree horizontal responses measures +1.53/–3.59 dB from 200 Hz to 10 kHz. The –3dB point is at 34 Hz, and the –6dB point is at 30 Hz. Impedance reaches a minimum of 5.02 ohms at 326 Hz and a phase angle of –40.82 degrees at 183 Hz.

The BP9060’s listening-window response measures +1.53/–2.31 dB from 200 Hz to 10 kHz. The –3dB point is at 32 Hz, and the –6dB point is at 29 Hz. Impedance reaches a minimum of 4.59 ohms at 365 Hz and a phase angle of –47.01 degrees at 208 Hz.

The BP9080 elevation section’s driver-axis response measures +2.31/–2.14 dB from 200 Hz to 10 kHz. The –3dB point is at 128 Hz, and the –6dB point is at 108 Hz. Impedance reaches a minimum of 5.08 ohms at 280 Hz and a phase angle of –34.23 degrees at 162 Hz.

The A90 elevation module’s driver-axis response measures +1.96/–2.77 dB from 200 Hz to 10 kHz. The –3dB point is at 134 Hz, and the –6dB point is at 112 Hz. Impedance reaches a minimum of 5.07 ohms at 288 Hz and a phase angle of –49.85 degrees at 158 Hz.—MJP

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canman4pm's picture

I would imagine the reason for a separate LFE input would allow the user of this setup to send equal amounts of bass to all four speakers, effectively creating a mid-sized speaker-four subwoofer system (5.4.4), to smooth and even out the bass. Whereas, not using the LFE input and having the AVR/pre-pro set to full range speakers, would result in the deep bass signals limited to whatever speaker(s) Atmos/DTS X assigned to that signal. I can see the benefits of both methods.

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