Peavey XR-700 User Manual

GRAPHIC EQUALIZERS (N)
The two seven-band equalizers are of the latest active type and exhibit performance comparable to that found in the finest
professional equipment. The graphic equalizers are ocated in the circuit just before the internal 100 watt RMS (@ 4 ohms) power
amplifiers and provide a very versatile and professional equalization of the overall system.
Because of the flexibility built into the XR-700, several different modes of operation are possible.
NORMAL MODE
Under normal operating conditions (no paten connections), the graphic equallzers'power amplifiers are connected through the
graphic input switching jacks to the main outputs. These signals are derived from the main mixing busses and are controlled Dy the
master level controls.
MONITOR OPERATION
The graphic equalizers and internal power amps may be used to power external systems This is done by simply patching from the
external device’s outputs to the graphic inputs using shielded patch cables When these patches are accomplished, the signals from the
internal mixing busses are available only at the output jacks on the patch panel and can then be used in conjunction with external power
amps, equalizers, or other accessories
MASTER EQUALIZATION
The master graphic equalizers are designed to provide room equalization, effective feedback control, and overall system frequency
balance. It is important to note that there are no firm operating instructions that will result in the deal EO for each and every set of
operating conditions. Experimentation with adequate understanding of the graphic equalizer is necessary to achieve optimum results.
No amount of equalization will totally correct an acoustically bad room/mic/speaker arrangement or completely correct the response
curve of a poor loudspeaker.
Please make sure that the power amplifier has adequate headroom to handleany boost that may be incurred. Ifyou boost 100 Hz by 3
dB. your power requirement will double. As an example: If your normal performing level requires 100 watts, the power required after
only a 3 dB equalization boost will be 200 watts.
You should always begin operation with the equalizers in the ”0" or center position. It Is wise to avoid excessive cutting of large
segments of the audio passband since this tends to reduce the dynamic range of the system Also, it is better to raise the master level
control rather than to use the majority of the equalizers in the boost position since better overall signai-to-roise ratio will result. As with
any equalizer, caretul experimentation and a little common sense will yield the best results.
FEEDBACK CONTROL
Graphic equalizers can be used to great advantage tor feedback suppression The whole point of feedback equalization is to obtain
the highest system gain before feedback. In essence, this requires the total system response to be as flat as possible The following
procedure is given as a guide only' Use common sense andtake your time when attempting theequalization process and your chances of
obtaining the desired results will be very good
Adjust all channel equalization and graphic equalizer controls for an indicated flat response, and slowly bring up the level by use of
the channel or master lovol controls until ihe system starts to go into feedback. Then very slowly adjust each section ot the graphic
equalizer until you find the one that has the most effect on the feedback. Return all other sections to the flat position and bring up the gain
until the system again goes into feedback Repeat the procedure and equalize out the second and third feedback modes and more if
necessary WARNING! You should never have to cut more than 6 to 9dB under normal conditions. If more cut is necessary, check for
proper phasing of the speaker system and microphone positioning One improperly phased speaker can cause unending feedback
problems. Do not expect to obtain a system that is completely free of feedback. Even the finest 1 octave graphic equalizers can only do so
much. In short, don’t expect miracles ..
“DDT " COMPRESSION (O)
The XR-700 is acompact and powerful system which features 100 watts RMS output per channel power amplifiers (@4ohms) with a
n8w type of dynamic compression. The compression effect enables us to maximize theperformanceof the amp/speaker combination. We
have determined through much research that the compression circuitry should prevent the power amps from running out of headroom
(clipping) and should be as simple to operate as possible to avoid undue complication for the user. The compression system is activated
by our exclusive “Distortion Detection Technique” (DDT») circuit (patent applied for) that senses overload conditions and activates
compression when clipping is imminent. In other words, compression takes place whenever signal conditions exist which prevent the
amplifiers from faithfully reproducing the input signal. The threshold is the clipping level itself and no specific threshold control is
provided. This technique effectively utilizes every precious watt available from the power amps. Because of the dynamics of music and
vocal program material, it is quite common to activate the compression circuitry virtually constantly during a performance sincothis is
what it is designed to do; i e.. operate to maximize the dynamics available from the amplifiers within their power output capabilities
regardless of power supply/line mains voltage variations and load impedance selection.
COMPRESSION LED INDICATORS (P)
The compression LED (light emitting diode) indicators show when compression takes place. As long as gain reduction isoccurrmg,
the LED’s will continue to illuminate, thereby giving a valuable indication of this unique compression function.
PILOT LED (O)
The pilot LED indicates when the electrical supply is switched on and is actually delivering power to the amplifier.
LED LEVEL DISPLAYS (R)
The XR-700 features dual ten-segment LED (light emitting diode) level Indicators. These all electronic displays have no moving parts
with resulting inertia as do conventional VU meters, and provide instantaneous indication of output signal conditions instead of the
“delayed'' average type response of older VU level indicators.
HEADPHONE LEVEL (S)
This control determines the drive available from either headphone jack. It is important to note that this control sets the level of both
main and monitor headphone jacks and operates as a sublevel off the two internal power amplifiers.
NOTE: Both headphone jacks are of the stereo (two-circuit) type but have been bridged to provide a mono signal to
stereo phones. Those jacks will accommodate any known headphones with impedances of 4 ohms or greater. (Mono phones
will also work with this system.) Both headphone jacks may be used simultaneously.
MONITOR HEADPHONE JACK (T)
This jack provides headphone level signal from tne monitor amplifier whose level may be set with the headphone level control.
MAIN HEADPHONE JACK (U)
This jack provides headphone level signal from the main amplifier whose level may be se; with the headphone level control
REAR PANEL
The rear panel of the XR-700 contains all the interface connections toand from the electronic circuitry. All Peavey consoles feature
inputs and outputs on the rear of the console chassis. From the manufacturing standpoint, *t is far easier and considerably less expensive
to position mic inputs on the front of the chassis as many of our competitors havechosen to do. By having inputson the front of a console
type mixer, the operator (when seated) must contend with a "lap full” of cables and wires, etc., which does not lend itself to
professionalism nor operator convenience.
Tne versatility offered by the XR-700 is unmatched Dy any competing unit ana a thorough understanding of the various features is
essential in order to fully utilize the performance and versatility of this unit.
INPUT SECTION (1)
Each channel of the XR-700 features both balanced (symmetrical) low impedance (600 ohms) as well as high impedance (5CK ohms)
unbalanced inputs. Each of these inputs feature extremely wide dynamic range and are fully transient protected to insure durability under
road conditions. While these inputs are intended primarily for microphones, they will also work nicely for many other types of program
sources

Peavey XR-700 Specifications

General

Brand	Peavey
Model	XR-700
Category	Amplifier
Language	English