22 Australian
LAB REPORT B&W 802 D3 Loudspeakers
CONTINUED FROM PAGE 20
LABORATORY TEST REPORT
Newport Test Labs fi rst looked at the averaged
room response of the B&W 802 D3, averaging
the response over a ‘window’ in front of the
loudspeaker. The result is shown in Graph 1
and you can see that it’s excellent, extend-
ing from the upper graphing limit for this
particular test (10kHz) down to 35Hz ±3dB.
Rather incredibly, the response from 50Hz
up to 10kHz is within ±1.25dB. That is very,
very fl at. It’s even more impressive when you
consider that the region where the response
‘steps down’ by 1dB (50Hz to 300Hz) is an
area that’s sensitive to room acoustics, so
with careful speaker placement,
even this might be ‘stepped up’
by 1dB.
The B&W 802 D3’s fre-
quency response above 10kHz
is shown in Graph 2 ... or more
precisely, its high-frequency
response from 700Hz up to
40kHz. In this case, 40kHz is
not only the limit of the test
equipment’s measuring capabil-
ity, it’s also the limit of the
test microphone’s calibration.
You can see that on this graph,
Newport Test Labs has measuredthe frequency response of the B&W 802 D3
as extending from 700Hz to 35kHz ±3dB. The
higher resolution of this graph shows minor
dips at 2.5kHz and 5kHz, plus a 5dB down-
step at 15kHz that then extends at the same
level out to 35kHz. The minor dip at 2.5kHz
is visible on the pink noise response as a very
shallow depression in the response, but the
dip at 5kHz doesn’t show on the response
at all, indicating that it would be inaudible
to the human ear. The overall frequency
response of the B&W 803 D3 is shown in
Graph 6, which was created by Newport Test
Labsmanually splicing the data from Graph
1 to the data from Graph 2. It
shows that the overall measured
response of the B&W 802 D3 was
35Hz to 35kHz ±3dB.
Low-frequency response is
shown in Graph 3, acquired
using a near-fi eld technique
that simulates what would be
measured in an anechoic cham-
ber. You can see the responses
of both bass drivers are almost
identical, which is excellent, but
actually very rare in a twin-driver
design, so full marks to B&W for
managing it.10 Hz 20 50 100 200 500 1K 2K 5K 10K 20K 40KdBSPL50556065707580859095100105(^110) Newport Test Labs
Graph 5. Frequency response. Trace below 1kHz is the averaged result of nine individual
frequency sweeps measured at three metres, with the central grid point on-axis with the
tweeter using pink noise test stimulus with capture unsmoothed. This has been manually
spliced (at 1kHz) to the gated high-frequency response, an expanded view of which is
shown in Graph 2. [B&W 802 D3 Loudspeakers Loudspeaker]
10 Hz 20 50 100 200 500 1K
dBSPL
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Graph 3. Low frequency response of front-firing bass reflex port (red trace), woofers (black
and blue traces) and midrange driver (green trace). Nearfield acquisition. Port/woofer levels
not compensated for differences in radiating areas. [B&W 802 D3 Loudspeakers]
10 Hz 20 50 100 200 500 1K 2K 5K 10K 20K 40K
Ohm
2
3
4
5
6
78
(^109)
20
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-180
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0
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Graph 4. Impedance modulus (black trace) and phase (blue trace), low-pass section (green
trace) and high-pass section (red trace). [B&W 802 D3 Loudspeakers Loudspeaker]
700 Hz 1K 2K 5K 10K 20K 40K
dBSPL
50
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(^110) Newport Test Labs
Graph 2. High-frequency response, expanded view. Test stimulus gated sine. Microphone
placed at three metres on-axis with dome tweeter. Lower measurement limit 700Hz.
20 Hz 50 100 200 500 1K 2K 5K 10K
dBSPL
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(^110) Newport Test Labs
Graph 1. Averaged frequency response using pink noise test stimulus with capture
smoothed to one-third octave. Trace is the averaged results of nine individual frequency
sweeps measured at three metres, with the central grid point on-axis with the tweeter.