Specifications - SWR WorkingPro WorkingPro 12 User Manual

Before changing your speaker setup, a basic
knowledge of impedance ratings is essential to
the quality of your sound and to the safe opera-
tion of your equipment.
The general rule is: if you connect a speaker
load with a total impedance that's equal to the
minimum impedance rating of your amplifier,
you'll be OK—as long as the speakers are rated
to handle the power output from your ampli-
fier.
The illustration shows the impedance totals
of different speaker combinations. NOTE: All
SWR® bass speaker enclosures, as well as most
others, are wired "in parallel" (not series), there-
fore, this section applies to parallel speaker con-
nections only.
All speakers in a group should have the same
impedance so that each speaker will receive the
same amount of power from your amplifier.
PART NUMBERS:
POWER REQUIREMENT:
POWER AMP
PRE AMP
SENSITIVITY AT FULL POWER:
TONE CONTROLS
EFFECTS LOOP
UNBALANCED LINE OUT
BALANCED LINE OUT
FOOTSWITCH (OPTIONAL):
LINE FUSE
SPEAKERS:
DIMENSIONS
WEIGHT:
10
Impedance Guidelines

Specifications

4452200010 (120V, 60Hz)
4452203010 (240V, 50Hz) AUS
4452204010 (230V, 50Hz) UK
4452206010 (230V, 50Hz) EUR
4452207010 (100V, 50Hz) JPN
650W
MINIMUM IMPEDANCE: 4Ω
POWER OUTPUT: 200W RMS into 4Ω @ < 0.1% THD, 1kHz
INPUT IMPEDANCE:
3.9M
15mV
BASS: ±15dB @ 100Hz
MID: ±15dB @ 800Hz
TREBLE: ±15dB @ 2kHz
SEND IMPEDANCE: 1.5kΩ
RETURN IMPEDANCE: 27kΩ
SEND IMPEDANCE:
1.5kΩ
SEND IMPEDANCE: 1.5kΩ
2-button, Mute, Bass Intensifier™ (P/N 065436)
100V MODELS: F8A L, 250V
120V MODELS:
F6A L, 250V
230V-240V MODELS: F3.15A L, 250V
1 Eminence® 12'' 4Ω (071300)
HEIGHT: 22.5 in (57cm)
WIDTH:
18.5 in (47cm)
DEPTH: 18.5 in (47cm)
44lb (20kg)
Product specifications are subject to change without notice.
◊
If impedances are different, the speakers with lower imped-
ances will be much louder than the others. For example,
with an 8–ohm speaker and a 16–ohm speaker both
connected to your amplifier, the 8–ohm speaker will be
twice as loud (and get twice the power) as the 16–ohm
speaker. Calculating total power handling capacity and
positioning speakers of different impedances becomes
complicated!
Δ CAUTION!—Operating with a speaker load below
the minimum impedance rating of your amplifier
can easily overheat the amplifier and cause dam-
age. Operating above the minimum impedance rat-
ing will reduce the amplifier's maximum power output
potential.
For an in-depth discussion of impedance and
power rating issues go to the SWR Website at
swrsound.com/support/setuptips.php—this article by
SWR founder Steve Rabe ran in the August '92 issue of Bass
Player™ Magazine.
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