4
■
Subwoofer Parallel-connection
The subwoofer A15W features four input/parallel connectors—two 1/4" phone jacks and two Neutrik NL4MP con-
nectors. Use either a phone jack or a Neutrik connector to receive input from your sound system/power amplifier.
One of the spare connectors can be used to parallel-connect an additional main speaker (keeping in mind the imped-
ance considerations mentioned below).
■
Impedance Considerations
When connecting speakers in parallel be sure to check the rated load impedance of the power amplifier. Most power
amplifiers are capable of safely driving speakers with minimum impedance of 8 ohms or 4 ohms. A pair of parallel-
connected 8-ohm speakers have a total impedance of 4 ohms. Two 8-ohm speakers can safely be paralleled on one
output. 4-ohm speakers, however, should not be parallel-connected with other speakers. These models can be con-
nected in parallel, however, if you are using a power amplifier that can safely drive load impedances of 2 ohms or
lower. Check your speaker impedance in the table below.
Speci
fi
cations
*
: EIA RS-426
Model
A10
A12
A15
A12M
A15W
Type
2 way Bass re
fl
ex
Bass re
fl
ex
Speaker Unit
LF
10" cone
12" cone
15" cone
12" cone
15" cone
HF
1" VC, Horn-TW
—
Frequency Response
65 Hz-20 kHz
60 Hz-20 kHz
65 Hz-20 kHz
50 Hz-200 Hz
with the internal low
pass
fi
ltering
Power Capacity
NOISE*
125 W
150 W
200 W
150 W
250 W
PGM
250 W
300 W
400 W
300 W
500 W
MAX
500 W
600 W
800 W
600 W
1000 W
Nominal Impedance
8
Ω
Sensitivity
96 dB SPL (1 W, 1 m) 97 dB SPL (1 W, 1 m) 98 dB SPL (1 W, 1 m) 97 dB SPL (1 W, 1 m) 97 dB SPL (1 W, 1 m)
Input Connectors
1/4" phone jack
×
1, Neutrik SPEAKON NL4MP
×
1
1/4" phone jack
×
2,
Neutrik SPEAKON
NL4MP
×
2
Socket Mount Diameter
35 mm (1 - 3/8")
Dimensions (W
×
H
×
D)
385 mm
×
542 mm
×
307 mm
405 mm
×
582 mm
×
323 mm
470 mm
×
672 mm
×
375 mm
582 mm
×
405 mm
×
323 mm
485 mm
×
622 mm
×
485 mm
Weight
13.0 kg
15.5 kg
21.5 kg
15.5 kg
28.0 kg
H
W
D
77.5
°
102.5
°
H
W
D
120
°
30
°
H
W
D
A10/A12/A15
A12M
A15W
Unit: mm
Specifications and descriptions in this owner’s manual are for information purposes only. Yamaha Corp.
reserves the right to change or modify products or specifications at any time without prior notice. Since specifi-
cations, equipment or options may not be the same in every locale, please check with your Yamaha dealer.
