Specifications

39
JBL Speakers – Subwoofers
speakers
subwoofers
Subwoofers
JBL PD5122
High output, low profile for
extended LF application
where frontal area is an
issue.
NB: cabinet is quite deep.
JBL VT4881A
Matching sub for the VerTec
VT4887A line array.
18” arrayable subwoofer•
2000 • watts continuous
91dB (1W/1m)•
25Hz-160Hz•
8 • Ω impedance
Integral flying hardware•
787 x 569 x 654mm•
50.4 kg•
JBL VPSB7118DP
Matching sub for VP
series or where premium
quality sub bass is
required.
18” powered subwoofer•
1800 • watts continuous amplifier
129dB peak•
29Hz-165Hz•
Fly track & 24 x M10 fittings•
515 x 702 x 813mm•
54 kg•
JBL ASB6128V
Premium performance sub woofer for large,
high SPL systems where extreme sub bass
extension is required.
2 x 18” “V” loaded subwoofer•
1600 • watts continuous
102dB (1W/1m)•
22Hz-300Hz•
4• Ω or 2 x 8Ω impedance
13 x M10 fittings•
967 x 561 x 1215mm•
89.8 kg•
What is the best placement for subs?
In many small to medium sized applications it becomes more cost effective to run sub woofers from a Mono feed. In most applications audio below 200Hz
is omnidirectional which defeats the purpose of Stereo imaging. This also facilitates the ability to place the subs together, creating a coupling effect, this
coupling increases sub output 3dB for every sub coupled. Eg one dual 18” sub delivers 98dB 1w/1m, place a second dual 18” sub on top and the output
steps up 3dB to 101 db 1w/1m.
A 3dB output increase is also attainable by placing individual subs in corners or against solid walls. For each surface you increase output by 3db, eg:
On the floor (1 surface) +3dB, against a wall (2 surfaces) +6dB and in a corner (3 surfaces) +9dB. This works well in bars, clubs and restaurants where
space is limited; a smaller sub can still provide more than adequate output.
TECH-TIPS
SURFACE 1
SURFACE 2
SURFACE 3
2 Surfaces
Floor + Wall
+ 6db
3 Surfaces
Floor + 2 Wall
+ 9db
1 Surface
Floor + 3db
2 x 12” slot •
loaded cabinet
1200 • watts continuous
96dB (1W/1m)•
31Hz-1000Hz•
4• Ω/2 x 8Ω impedance
20 x M10 fittings•
375 x 673 x 706mm•
36.4 kg•