Peavey CS-400 Operating Manual page 6

Referring to Diagram 3, crossover networks (PL-6™, -7™, or -8™) are shown plugged into both crossover accessory sockets (8) and transformer
modules (PL-2's™) are plugged into both transformer accessory sockets (6). This configuration now has the makings of a complete stereo,
balanced bi-amp system. The only thing required is an additional stereo power amplifier which, together with the existing dual power amp sections
of the CS-400™, make up the four independent power amplifiers required for a
stereo
bi-amplification system. You will notice from the diagram that
when the crossover networks were substituted for the jumpers, the power amp input connections were disconnected from the crossover circuit. In,
order to complete the system, external patching must be accomplished using shielded patch cords.
As per previous discussion, bi-amplification systems generally require more power for the low frequency system than the high frequency
system In fact, an often used combination is a ratio of two-to-one (twice as much for the lows as for the highs). Such a system can be achieved
usinq a Peavey CS-800™ stereo power amp for the two low frequency channels and the Peavey CS-400™ for the two high frequency channels. This
system can be'realized by patching (he high outs (10) to the inputs of the CS-400™ and by patching the low outs of the crossover network (9) to the
inputs of the CS-800™. Four shielded patch cords are required in this configuration. Care must be taken to connect the proper speaker system
components to the correct power amp outputs. A diagram is included showing all connections. It is recommended that all connections be
completed and double checked before applying power.
Wrong connections could result in loudspeaker damage.
Always remember the power
amplifiers should be switched on to A.C. power last in the chain of audio equipment, and only then with level controls at "0." Then gradually increase
levels to check connections and make sure at low sound pressure levels that the system (especially bi-amped situations) has proper routing of
high's and low's to respective amps, horns, and bass enclosures.
A very effective bi-amp situatior can be created using the Peavey CS-400™ in conjunction with the Peavey CS-800™ as illustrated in the wiring
diagram above.
Hookup is as follows:
1 The high output of the crossover on each channel of the CS-400™ is patched to the input of that channel using shielded cables. (Channel A
high output to Channel A input / Channel B high output to Channel B input.)
2. The low output on each channel of the CS-400™ is patched to the input of the corresponding channel of the CS-800™ using shielded cables.
(CS-400™ Channel A low output to CS-800™ Channel A input / CS-400™ Channel B low output to CS-800™ Channel B input.)
3. The CS-400™ speaker outputs are connected to the respective high frequency enclosures.
4. The CS-800™ speaker outputs are connected to the respective low frequency enclosures.
The use of the DDT® compression system adds a new dimension to a total bi-amp system. Since the low frequency power amp and the high
frequency power amp each have their own "Distortion Detection Technique" circuitry and are completely independent, when signal conditions
exist which could cause clipping in the low frequency power amp, the DDT® system will simply limit that portion of the total sound system. This will in
no way affect the high portion of the bi-amp system and it is free to increase in level until it, too, runs into clipping. Then, at that point, the high
frequency system will also go into compression. This is a very effective two-level compression system and will yield a sound pressure level
unmatched by conventional broad-band compression techniques.
Several comments must be made:
Only
one
crossover module is required for a
monaural
bi-amp system.
The outputs of the crossover can drive several power amp inputs. Parallel input jacks can be used to "daisy chain" to additional power amps for
either the low or high frequency systems.