Peavey DEP 800 User's Manual
Contents
1. A C Line Cable Used to supply 120 volt 60 Hz A C mains power to the unit Should be plugged into any standard 120 wall outlet or equivalent Export models utilize 220 240 volt A C 50 Hz power supplies with appropriate main plug and cable assembly B Stereo Chorus Line Level Output Line level output jack to provide signal levels of 2 0 Vrms 6 dBV as an output Can be used in conjunction with the front panel jacks FOOTSWITCH SECTION C Bypass Switch Remote control of the Bypass function D Hold Switch Remote control of the infinite Hold function E Modulation Control External modulation input control INPUT SECTION F Line Level Input Line level input jack to accommodate a 2 0 Vrms 6 dBV level signal input When used the front panel jack is disabled TYPICAL EFFECTS DESCRIPTIONS Shaded regions indicate areas of activation Comb Filtering ME GAES Th m Lice pal aa ay 2 COBO LAE ox poy eve serut ae ager 800 ADJUST LeveL Pr SPED FOLD BYPASS S PROBESSOH LeveL Flanging INPUT avenon a Lew evet active INe FORTS PRICE SERIES 800 e ae Key b Dern teve Chorusing weUr DELAY FEEDBACK MODULATION verano a s ape nf o s 0 AN 2 Cy a rao 8 B D 3 Sepa E oo oi non Doubling TNPUT DELAY FEEDBACK MODULATION arn oao A 2 i te Fey Lega ra sete d ony NOELAY mu2. Filter for both anti aliasing and for signal reconstruction minimizes distortion by providing excellent stop band signal rejection This special signal processing implementation provides a wide variety of digital effects at an affordable price with excellent performance specifications 4 es TABLE OF CONTENTS ce 1 Attroduotion s iv E Il Processor Specifications I Processor Features 8 1V Front Panel Description V Rear Panel Description VI Typical Effects Descriptions Vil Block Diagram and Circuit Description ne SPECIFICATION S eS DELAY RANGE 3 12 to 800 milliseconds DELAY ADJUST 0 5 50 to 2 0 200 of range FREQUENCY RESPONSE 20 Hz to 10 KHz all settings 1 0 dB QUANTIZATION 8 Bits A D amp D A Conversion Log Companding with Pre Emphasis SAMPLE RATE Variable Conversion Rate Varies w Modulation and Delay ANTI ALIASING FILTER 10 kHz 6 pole Chebyshev Low Pass Filter 36 dB Octave minimum roll off SIGNAL TO NOISE 48 dB minimum delay 90 dB minimum dry DYNAMIC RANGE 90 dB minimum delay 90 dB minimum dry INPUTS Low Level 0 25 Vrms 12 dBV Front Panel Line Level 2 0 Vrms 6 dBV Rear Panel OUTPUTS Low Level Stereo 0 25 Vrms 12 dBV Front Panel Line Level Stereo 2 0 Vrms 8 dBV Rear Panel HEADROOM Active 6 dB reserve Overload 3 dB reserve VCO MODULATION Complete control of the LFO modulation of the internal VCO L
3. as manual functions on the front panel These controls consist of the BYPASS and HOLD controls The BYPASS control allows the unit to be bypassed entirely the only active control being the INPUT LEVEL control The HOLD control allows for the infinite repetition of all the signal data in the memory without any degradation The footswitch control connects the tip to the barrel of the phone plug to activate the remote functions Also available on the rear panel is an external jack input for MODULATION control An external input can be applied through this jack to control the effects from an external source The CONTROL VOLTAGE input should vary within a range from 0 Volts to 5 Volts and is internally protected against transients The DELAY SELECT and DELAY ADJUST controls are utilized to select the range of the delay desired and the exact value of the delay or effect Thenumber at each setting of DELAY SELECT indicates the maximum amountof delay tor that range in milliseconds mSec The DELAY ADJUST varies the amount of delay within that range from approximately 0 5 to 2 0 times that range setting Thus a 4 to 1 range is available for each range setting The MODULATION controls are also available as front panel manual controls The MODULATION controls consist of the MODULATION SPEED which varies the LFO modulator frequency from 0 1 to 10 0 Hz andthe MODULATION DEPTH which varies the distance through the memory that is traversed by the modulatio
4. unit C The unit does not operate correcily D The unithas been dropped or the enclosure damaged The user should not attempt to service this equipment All service work should be done by a qualified service technician PEAVEY ELECTRONICS CORPORATION 711 A Street Meridian MS 39901 U S A Telephone 801 483 8965 Telex 504115 1984 Printed in US A 80300111
5. which is constructed with the 16K Dynamic RAM Random Access Memory providing the 800 milliseconds of possible delay The Digital to Analog conversion is provided using state of the art D A circuitry and corrective equalization to assure no reduction in frequency response due to sampling SIN X X windowing The Digital to Analog conversion is followed by another 10 kHz 6 Pole 36 dB Octave Chebyshev Low Pass Filter for signal reconstruction and glitch removal R The processed analog signal is then sent to the output mix circuitry in both its in phase and out of phase formso that itcan be mixed with the dry input signal andalso sent back to the input circuitry as a feedback signal The output signals are available at the front panel low level Stereo Chorus outputs as both in phase mixed and out of phase mixed signals and at the rear panel line level Stereo Chorus outputs Both phases of the delayed signal are also available as feedback signals to either accentuate or diminish certain portions of the audio spectrum The level of the feedback signal is controllable using the FEEDBACK LEVEL control A 5 kHz low pass filter is available in the feedback loop to allow the reduction of high frequency noise build up in the prolonged feedback The output signals are separately de emphasized prior to the output stage in order to restore them to their original levels after processing Two remote controls are available on the rear panel as well
6. FO Depth Range Up to 4 1 LFO Frequency 0 1 Hz to 10 Hz LFO Waveshape Triangle Wave w variable amplitude HOLD Replays signal in memory indefinitely without degradation FEEDBACK Allows feedback of delayed signal for multiple echos or for effects FOOTSWITCH Bypass Hold MODULATION Input for Modulation of VCO ns FEAT UR ES Continuously variable delay time from 3 12 milliseconds to 800 milliseconds 0 800 seconds with 8operating ranges 20 Hz to 10 kHz bandwidth at all delay settings and with any special effects active Easily controlled Low Frequency Oscillator LFO with continuously variable frequency and depth for modulation of effects Wide range of special effects including Flanging Chorusing Doubling Slapback Echo Vibrato Long Delay Hold switch with optional footswitch control for infinite repeat without signal degradation Low Level and Line Level inputs and outputs for ease of use in a multitude of operational environments Dual phase processing of feedback and delay output signals Stereo Chorus outputs with dry delay mix control Bypass switch with optional footswitch control External Effects modulation inputs for VCO control FRONT PANEL J Fecoacc y MeDULATN Ki Tn ROIS TO sem SAN sg me ig EJ on gt oa W oo SERIES uvine wit oe due e he an Se ao eee sees BOO INPUT SECTION 1 Low Level Input Musical instrumen
7. OAD condition could cause distortion and a noticeable deterioration in sound quality It should be pointed out that the ACTIVE and OVERLOAD indicators are located after the feedback signal is mixed in giving an excellent indication of any potential overload condition The INPUT LEVEL control also ultimately sets the output signal level If the green ACTIVE indicator is lit andthe red OVERLOAD indicator flashes occasionally the output level will nominally be 250 mV 12 dBV at the front panel output jacks and 2 0 V 6 dBY at the rear panel output jacks To minimize any problems due to aliasing Analog to Digital conversion is preceded by a 10 kHz 6 Pole 36 dB Octave Chebyshev Low Pass Filter constructed with precision components to assure flat response and minimum in band ripple The anti aliasing filters are followed by a compression stage to provide an increased Dynamic Range for the 8 bit Analog to Digital conversion This conversion takes place at a variable rate depending on the DELAY ADJUST setting and the degree of MODULATION which is introduced as an effect The nominal sample rate with the DELAY ADJUST set at x1 and with no MODULATION enabled is 40 kHz once again to minimize aliasing effects should the effects be enabled The A D converter components are matched to assure the proper linearity and conversion accuracy for the Signal to Noise ratio attainable with an 8 Bit system The digitized signal is then stored in the memory
8. OPERATING GUIDE CAUTION TO PREVENT ELECTRICAL SHOCK OR FIRE HAZARD DO NOT EXPOSE THIS INSTRUMENT TO RAIN OR MOISTURE BEFORE USING THIS INSTRUMENT READ BACK COVER FOR FURTHER WARNINGS CLASS B COMPUTING DEVICE INFORMATION TO USER This equipment generates and uses radio frequency energy and if not installed and used properly that is in accordance with the manufacturer s instructions may cause interference to radio and television reception It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference in a residential installation However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures e reorient the receiving antenna relocate the equipment with respect to the receiver e move the equipment away from the receiver e plug the equipment into a different outlet so that the equipment and receiver are on different branch circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prep
9. PROVIDE ADEQUATE SIGNAL VOLTAGE FOR PLAYING MODERN MUSIC IMPROPER USE OF THE GAIN EQUALIZATION CONTROLS AND OR IMPROPER USE OF INTERNAL EXTERNAL BUSSES MAY CREATE CLIPPING SQUARE WAVES ANO POSSIBLY CAUSE SUBSEQUENT DAMAGE TO THE LOUDSPEAKER SYSTEMS EXTENDED OPERATION OF THE GAIN EQUALIZATION CONTROLS IN THEIR MAXIMUM POSITIONS IS THEREFORE NOT RECOMMENDED PLEASE BE AWARE THAT MAXIMUM POWER CAN BE OBTAINED WITH VERY LOW SETTINGS OF THE BAIN EQUALIZATION CONTROLS IF THE INPUT SIGNAL 15 VERY STRONS IT IS COMMON PRACTICE AMONG USERS OF SOUND REINFORCEMENT EQUIPMENT TO IDENTIFY THE INDIVIDUAL CHANNELS WITH A STRIP OF TAPE PLACED ABOVE OR BELOW THEROW OF VOLUNE FADERS MANY TYPES OR BRANDS OF TAPE HAVE A VERY STRONG ADHESIVE WHICH AN INHIBIT THE PAINT ON THE FACEPLATE AND ACTUALLY REMOVE THE PAINT WHEN THETAPE IS REMOVED WE STRONGLY RECOMMEND THAT SCOTCH TAPE NOT BE USED ON PAINTED SURFACES NOR ANY OTHER TAPE THAT ISNOT ESPECIALLY DESIGNED FOR SUCH APPLICATIONS NEDIUM ORLIGHT ADHESIVE MASKING OR MER LABEL TAPE IS RECOUMENDEDIF TAPE IS USED ANY TAPE LEFT ON PAINTEDSURFAGEFOREXTENOED PERIODS WILL BE DIFFICULT TO REMOVE NEVER USE CLEAR OR SCOTCH AF JESE APPLI l Read all safety and operating instructions before using this product All satety and operating instructions should be ratained tor future reference Obey all cautions in the operating instructions and on the back of the unit All operating Instructions should be followed This product shou
10. ared by the Federal Communications Commission helpful How to Identify and Resolve Radio TV Interference Problems This booklet is available from the US Government Printing Office Washington DC 20402 Stock No 004 000 00345 4 INTRODUCTION The Peavey Digital Effects Processor 800 utilizes advanced technology and unique implementation approaches to provide high performance digital audio processing in a unique affordable package Its quality performance and capabilities are defined specifically for the performing musician with no American Express Gold Card The DEP 800 System provides continuously adjustable delay settings from 3 12 milliseconds to 800 milliseconds 0 800 seconds with the best possible signal quality A full instrument bandwidth 20 Hz to 10 kHz is available at all settings and with any of the effects enabled This allows for utilization with a large number of musical instrument signal inputs where a higher bandwidth is not required By utilizing the extended range of delay settings a wide range of digital effects including flanging doubling chorusing and slap back echo can be obtained through the front panel controls The front panel controls allow for the addition of LFO modulation of the delay length feedback or regeneration of the delayed signal LFO modulation of the output signal frequency and total amplitude and phase control of both feedback and delayed signals The utilization of a 6th order Chebyshev Low Pass
11. ld not be used near water i e a bathtub sink swimming pool wet basement etc This product should be located so that ts position does not interfere with its proper ventilation It should nol be placed flat against 2 wal or placed in a built in enclosure that will impede the flow of cooling air 7 This product should not be placed near a source ot heat such as a stove heater radiator or another heat producing amplifier Connect only to a power supply of the type marked on the 13 unit adjacent to the power supply cord Never bieak off the ground pin on he power supply cord Far more information on grounding write for our free booklet 14 Shock Hazard and Grounding Power supply cords should always be handled carefully Never walk or place equipment on power supply cords Periodically check cords for cuts or signs of stress especially atthe plug and the point where the cord exits the unit The power supply cordshould be unplugged when the unitis to be unused for long periods of time Metal parts can be cleaned with a sovoring used on some units can bo cl rag or an ammoria based household cleaner If necessary Care should be taken so that objects do novall and liquids are not spilled into the unit through the ventilation holes or any other openings This unitshould bechecked by a qualified servicetechnician itt A The power supply cord or pug has been damaged ler B Anything has fallen or been spilled into the
12. n By adjusting the MODULATION DEPTH and the DELAY ADJUST controls sweeps of the signal spectrum of up to 4 to 1 can be accomplished Due to our efforts for constant improvement features and specifications are subject to change without notice DANGER EXPOSURE TO EXTREMELY HIGH NOISE LEVELS MAY CAUSE A PERMANENT HEARING LOSS INDIVIDUALS VARY CONSIDERABLY IN SUSCEPTIBILITY TO NOISE INDUCED HEARING LOSS BUT NEARLY EVERYONE WILL LOSE SOME HEARING IF EXPOSED 10 SUFFICIENTLY INTENSE NOISE FOR A SUFFICIENT TIME TNE U S GOVERNMENT S OCCUPATIONAL SAFETY ANO HEALTH ADMINISTRATION OSHA HAS SPECIFIED THE FOLLOWING PERMISSIBLE NOISE LEVEL EXPOSURES DURATION PER DAY IN HOURS SOUND LEVEL dBA SLOW RESPONSE 8 90 6 92 4 95 3 7 2 100 te 102 1 105 110 or less 115 ACCORDING TO OSHA ANY EXPOSURE IN EXCESS OF THE ABOVE PERMISSIBLE LIMITS COULD RESULT IN SOME HEARING LOSS EAR PLUGS OR PROTECTORS IN THE EAR CANALS OR OVER THE EARS MUST BE WORN WHEN OPERATING THIS AMPLIFICATION SYSTEM IN ORDER TO PREVENT A PERMANENT HEARING LOSS IF EXPOSURE IS IN EXCESS OF THE LIMITS AS SET FORTH ABOVE TO INSURE AGAINST POTENTIALLY DANGEROUS EXPOSURE TO HIGH SOUND PRESSURE LEVELS IT IS RECOMMENDED THAT ALL PERRONG EXPOSED TOEDUPMENT CAPABLE OF PRODUGNG HEH SOUND PRESSURE LEVELS SUCH AS THIS AMPLIFICATION SYSTEM BE PROTECTED BY HEARING PROTECTORS WHILE THIS UNIT IS IN ERATI CAUTION THIS MIXING CONSOLE PREAMP EFFECTS DEVICE HAS BEEN DESIGNED AND CONSTRUCTED TO
13. t input jack set for a nominal input level of 250 millivolts 12 dBV 2 Input Level Control Gain control for the input section of the Digital Effects Processor Used to maximize the signal to noise ratio of the unit Should be adjusted such that the Overload indicator just begins to light 3 Active Indicator Indicates that the processor input level is sufficient for adequate operation 4 Overload Indicator Indicates when the processor has only 3 dB of headroom left available Continuous illumination of the Red LED indicates that the unit is being overdriven and distortion could result DELAY SECTION 5 Range Select Switch selection of the desired delay memory range Range Number indicates the amount of delay in milliseconds available with the Delay Adjust control set at 12 o clock 6 Delay Adjust Varies the amount of delay from 0 5 50 to 2 0 200 of the selected delay range Also varies the maximum amount of modulation achievable on a particular range REGENERATION SECTION 7 Feedback Level Controls the amount of feedback signal and thus the amount of regeneration accomplished Also controls the phase of the feedback signal No feedback is generated with the control set at 12 o clock Rotation ina CCW direction increases the negative phase while rotation in a CW direction increases the positive phase feedback MODULATION SECTION 8 LFO Depth Controls the modulation depth or the maximum or minimum delay length Maxim
14. um achievable range varies with the Delay Adjust setting but can be as much as 4 to 1 9 LFO Speed Controls the LFO Modulation frequency from approximately 0 1 Hz to 10 0 Hz OUTPUT SECTION 10 Hold Provides an infinite repeat of the signal stored in memory without degradation Footswitch control option 11 Bypass Allows the bypass of the Digital Effects Processor regardless of any settings Footswitch control option 12 Output Mix Provides the control of the mix of the dry and the delayed signal Both in phase and out of phase signals Stereo Chorus A output and B output are controlled simultaneously Output signal canbe varied from only dry no delay signal to only delayed signal Output level is nominally 12 BV or 0 25 Vrms 13 Stereo Chorus Output Provides simultaneous outputs for both in phase and out of phase delayed signal mixed with the original dry signal Mix is controlled with the Output Mix Control 14 Power Switch Used to turn on the unit Enables the A C power for both the 15 volt supply and the 5 volt supply 15 Power On Indicator Indicates that the power has been applied to the unit Power should be turned off before plugging in the unit or removing the plug from the A C source REAR PANEL yor SISNAL OUTPUT FOOT SWITCH MODULATION INPUT SIGNAL INPUT a cat aoe Tie ae ze FRI m O AA E an A OVENS 8 eveass noo COWTROLIOSV UNE LEVEL 6 48 OUTPUT SECTION A
15. useconos BOUT EVEL Dept SPEO MOD BYPASS mik lawie acme Tevet Panen Slapback Echo INPUT DELAY MODULATION TE TERESE owentona vst oe Jey o es l A e a e SERIES a a a oe ot fo omaa os Long Delay Single or Multiple Repeats INPUT DELAY FEEDBACK MODULATION J 7 ORES m pa URS P 5 JRI ES a alge A SERIES m s D k oypgyet aomu Teve muuseconos x08 eee POWER it i STEREO i cHoRUS ane ew DELAY RANGE DEP 800 Cain BLOCK DIAGRAM CIRCUIT DESCRIPTION Two separate inputs are provided on the Digital Effects Processor An instrument level input nominally 250 mVolts or 12 dBV is provided on the front panel and a line level input nominally 2 0 Volts or 6 dBV is provided on the rear panel Both inputs are passed through an input gain stage in preparation for processing If the front panel low level input jack is used the rear panel line level input jack is disconnected After the initial gain stage theinput signal is pre conditioned using a pre emphasis circuit to provide better Signal to Noise characteristics for effects operation The INPUT LEVEL control sets the level for the input signal for optimal Signal to Noise and ultimately the output level for the processor The INPUT LEVEL control should be set so that the green ACTIVE indicator is lit and the red OVERLOAD indicator only flashes occasionally Continued operation with an OVERL
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