I found a pdf file on a speaker manufactured by Legacy that I thought would be interesting to read. I DID NOT WRITE THE DOCUMENT! Just want to share as information and pulled out a section regarding this topic.
This format is the simplest way to connect your loudspeakers to
your amplifier. A single twin-conductor cable is used to link the
loudspeaker to a single channel of amplification. Jumper wires must
be left in place on the loudspeaker.
Biwiring allows one to minimize the cable losses between the
amplifier and the loudspeaker. This is accomplished with a single
stereo amplifier by running separate sets of cables to the satellite
section and the subwoofer section from the same channel of
This technique allows one to “play” with wire parameters a bit
(such as heavy gauge wire on the sub sections and light gauge solid
core on the satellites).
When biwiring, the use of gold spade lugs or dual banana plugs can
make the task much easier and safer than bare wire connections.
Again, the major reasons for biwiring over conventional wiring are
greater power transfer (improved efficiency) and tighter control over
the drivers (better damping).
This option can yield even better results than biwiring due to
broader distribution of power requirements.
Passive biamplification allows low frequency current demands to
be routed to a separate channel of amplification, thus reducing strain
on the satellite amplifier and preventing subwoofer back-EMF from
modulating with the upper frequencies. There are two types of
passive biamplification;Vertical biamping (which requires two
identical stereo amplifiers or four monoblocs) and Horizontal
biamping (which does not require identical amplifiers).
1. Vertical Biamping
Vertical biamplification requires the dedication of a single stereo
amplifier for the left speaker, and another stereo amplifier for the right
speaker. This configuration improves channel separation and can
improve imaging slightly. If your preamp does not have two sets of
left/right outputs, you will need a pair of Y-adapters or a signal splitter,
such as a dual amp balancer, which will also allow adjustment of
subwoofer/satellite input levels.
2. Horizontal Biamping
Any two stereo amplifiers may be utilized in horizontal
biamplification. Many audiophiles prefer the "sweetness" of tubes on
the satellite portion of the loudspeaker while favoring the "control
and weight" of solid state amplifiers on the subwoofer section.
The biggest drawback of such a marriage of amplification is that
the two amplifiers may have different input sensitivities or output
polarities. Differences in the input sensitivities may be overcome by
using a dual amp balancer. This unit allows independent balancing of
the left subwoofer/satellite ratio and right subwoofer/satellite ratio.
It's also a good idea to check the owner's manuals to establish if
the amplifiers are inverting or non-inverting. If the two amplifiers are
of opposite polarity, then you should reverse the polarity at the inputs
of either the subwoofer or satellite binding posts.
NOTE: The above only applies to loudspeakers that incorporate the
subwoofer and satellite section in a single enclosure. It does not
apply towards the separate powered subwoofer/satellite configuration.
You must always observe the polarity when connecting the speaker
wire to a powered subwoofer.
This option requires the utilization of an electronic (powered)
external crossover. Active biamplification is the most appealing means
of interfacing a subwoofer/satellite system due to the control
possibilities offered, but can also be the most costly.
An active crossover is inserted between the preamplifier outputs
and the inputs of two stereo amplifiers. Vertical or horizontal
biamping considerations are also applicable here.
A well designed active crossover will offer the user independent
high pass / low pass turnover frequencies for optimally blending the
satellites with the subwoofer sections of the speaker system. Other
features usually found are separate level controls for the high pass or
low pass sections and a choice of inverted or non-inverted low
frequency outputs (needed when strapping an amplifier to mono).
Also helpful is bass equalization and subsonic filtering.
When cascading active filters with the existing passive filters
within the speaker system, be sure to allow for adequate frequency
overlap. For instance, if the passive crossover is set at 500 Hz, select a
low pass corner frequency of 600 Hz and a high pass corner
frequency of 450 Hz to prevent a suck-out in the response at 500 Hz.
The controlled distribution of power afforded by the active
crossover results in less amplifier strain (better clarity), greater
dynamics, and lower intermodulation distortion. However, a basic
understanding of crossover slopes and crossover frequencies within
your loudspeaker will be needed to implement the active crossover