Wharfedale Pro SI-18BX - Manual (Page 6)

SI-X ™ Series
SETTING UP/ SPEAKER PLACEMENT
The uniform dispersion of the SI-X ™ Series makes it easy to position the speakers where you need them,
rather than trying to rearrange the room to accommodate the sound system. And the multi-faceted cabinet
with mounting hardware makes the job of installing the speakers that much easier. For the best coverage
and highest quality sound, the speakers should be located above head level.
You don’t think you are getting all the bass you need? The SI-X series has three (3) subs can help: SI-12BX
& SI-15BX are folded horns that give you the lowest frequencies and the punch you need. The SI-18BX is a
straight forward, no nonsense 18-inch bass reflex subwoofer with exceptional low frequency response.
CONNECTIONS/ WIRING
4
Connecting the SI-X™ Series to your system is easy. The rear panel includes two (2) parallel NL4 and a
barrier strip connector. Run your speaker wires from your amplifier to the speaker; you can use either input
connector. Use the correct gauge of stranded insulated speaker cable according to the power handling
ability of your SI-X™ Series cabinet. It is always advisable to use heavier gauge (lower number) cables on
longer runs. Be sure to connect your speakers in proper polarity (what many refer to erroneously, as
phase). This means that in normal operation, connect one end of the same wire to the + or Red terminal on
the amplifier and the other end to the +1 or ‘ +’ terminal of the barrier strip on the speaker. The other wire is
connected to the –1 pin on the NL4 or the ‘ –’ (negative) terminal on the barrier strip.
If you are using the SI-12BX, SI-15BX or the SI-18BX subwoofers, you must use an external crossover;
passive or active. See the frequency response data for each model in the SPECIFICATIONS section of this
manual on the following page. You will need to use another amplifier – one channel for the mid/high
speaker (high pass) and another channel for the low pass (subwoofer).
Generally speaking, electronic crossovers using 24 db/octave Linkwitz Riley filters is a good beginning. For
example: to use the SI-15BX with the SI-15X, set the low pass output to 250 Hz and the High Pass to
250Hz. Consult the Crossover manual (such as Wharfedale WPG-202) for details on setting the crossover
parameters.
Connections to Subwoofers
Your Si-X™ Subwoofers are intended to be used with full electronic crossovers.
Note - There are No Low Pass or Hi-Out crossovers in the subwoofers.
We recommend the use of our electronic crossover WPG-202 or similar as required.