JBL 4310 User Manual

Adjustable response contour
Recessed front panel controls allow separate adjustment of the
1500-7,000 Hz
"presence " range and the 7,000-15,000 Hz "bril-
liance " range. Controls are continuously variable from maximum
to full off. With suitable settings of the two controls , the fre-
quency response contour of the 4310 can be altered to compen-
sate for almost any acoustical environment, and to achieve the
exact tonal
balance desired. Control scales are clearly marked
so that special settings can be logged and easily reset
when needed.
Performance characteristics
The accompanying graphs and specifications were compil ed
from
measurements made under standard laboratory test con-
ditions : The loudspeaker system was mounted flush in the center
of a large flat baffle in an anechoic environment. A calibrated
condenser microphone was suspended at a known distance from
the sound source, sufficiently far to be safely out of the near
field. All associated electronic equipment was checked and
cal ibrated
before tests were run.
The
on-axis response of a typical system does not vary more
than ' 3 dB from 45to 15,000 Hz. Because of the wide - angle
characteristics of the high frequency transducers and their physi-
cal orientation , response measured up to 45 ' off-axis, either hori-
zontally or vertically, does not deviate more than 6 dB from on-axis
response at 2 kHz or more than 10 dB at 8 kHz. The 4310's lack
of distortion is equally outstanding . Distortion is inaudible even at
high pow
er levels and very low frequencies, as shown in the
photo at left.
While the specifications indicate that Model 4310 has impres-
sive performance characteristics, they cannot convey the full
impact of an extended listening evaluation . Clean, crisp , wide
range performance even at very loud levels, .. powerful bass
fundamentals
without doubl ing ... lifelike voice projection ...
these are
qualities found in few loudspeaker systems regardless
of size or price. When heard from a monitor occupying less than
2.5
cubic feet, the effect is little less than awesome. No other
loudspeaker system approaches the JBL 4310 in its combination
of versatility, performance quality and small size.
, ,S
'10
's
-s
-'0
-,s
20
"s
11 0
-s
-10
- ,s
20
(
---.::........~---~
'00
Frequency In Hz 1000
'0.000
Response contour of system with controls set "flat. "
(Presence sel
at "2, " Brilliance sel at "7. " )
Measured
on-axis response of a typical 4310, including
all peaks and dips,
docs not deviate more than 3 dB
from above curve.
'00
Frequency In Hz 1000 10, 000
Response contours showing effects of various "pres-
ence" and " brilliance" control settings ,
Section drawing of 12-inch low frequency transducer.

JBL 4310 Specifications

General

Impedance	8 ohms
Type	Studio Monitor
Woofer	12-inch
Midrange	5-inch
Tweeter	1.4 inch