ENSONIQ DP/2 Specifications Page 25
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Section 1 — Controls & Basic Functions
ENSONIQ DP/4+ Reference Manual 9
Ground Loops
Sometimes currents flowing through the ground line generate a signal seen by another part of the
circuit sharing the same ground. In other words, if there are two identical signal paths within a
circuit, they can form a loop which can result in hum and/or noise. If you are using equipment
that has 3-prong “grounded” AC power cords, you may suffer from a ground loop resulting from
the interconnection of this equipment. The following diagram shows how cascading or
“chaining” the output of one 3-prong grounded system into the input of another 3-prong
grounded system with a standard, unbalanced 2 conductor cord (like a 1/4” guitar cable) can
result in a ground loop.
(circuit ground)
+
+
3-Prong
"Grounded"
System
3-Prong
"Grounded"
System
Earth Ground
SIGNAL PATH
Unbalanced Output to Unbalanced Input.
Single conductor shielded cable
Ground Loop
>
<
FIG. 1
(circuit ground)
+
+
3-Prong
"Grounded"
System
2-Prong
"UNGrounded"
System
Earth Ground
SIGNAL PATH
Unbalanced Output to Unbalanced Input.
Single conductor shielded cable
FIG. 2
Fig. 1 shows a system interconnection where a ground loop can exist. Fig. 2 shows a system
interconnection where a ground loop does NOT exist.
The DP/4+ has “ground compensated” outputs, which offer the advantages of balanced outputs
(minimized hum and interference), plus the advantage of a transformer isolated output
(eliminates ground loop problems). The output connector “grounds” are not hooked directly to
the DP/4+ ground, thus eliminating the ground loop. This ground compensating scheme works
on both balanced and unbalanced equipment with standard cables.
Ground loops are possible only on the inputs, and only in the following situations:
1. When a standard balanced cable is used from the preceeding piece of equipment (i.e., a
standard stereo cable).
R
T
R
T
Standard Balanced Cable
Black
Red
Shield
S S
2. When a standard unbalanced cable is used from the preceeding piece of equipment.
TT
Standard Unbalanced Cable
Red
Shield
S S
This does not mean there will always be an input ground loop problem, just the possibility.
- D P / 4 + 1
- IMPORTANT: 2
- Table of Contents 3
- DP/4+ List of Tips 3
- Section 4 — System•MIDI 6
- Welcome! 9
- Polarization and Grounding 10
- AC Line Conditioning 11
- Reinitializing the DP/4+ 13
- Warning! 14
- Need More Help? 15
- There must be 17
- Front Panel Controls 18
- A:Hall Reverb 19
- Mix=25 Volume=99 19
- Rear Panel Connections 20
- DP/4+ RULES 21
- Headphones 22
- Mic Gain 23
- Output Jacks Input Jacks 24
- Ground Loops 25
- About Mono Foot Switches 27
- Four-On-The-Floor 28
- HOT MODS! 29
- DP/4+ Modes 31
- About Select Mode 32
- About Edit Mode 33
- About System•MIDI Mode 34
- About Presets 35
- 1 source 2 source 35
- 3 source 35
- 4 source 35
- Selecting Config Presets 36
- Crystal Cave CMP~fla+pit⁄rev 37
- Vocal Plate 1 A:Large Plate 37
- A:Algorithm Name 38
- Mix=48 Volume=99 38
- Bypassing Units 41
- Quick Tips and Shortcuts 41
- EQ - DDL - WITH LFO 44
- EQ - FLANGER - DDL 46
- EQ - PANNER - DDL 48
- EQ-TREMOLO-DDL 50
- EQ - VIBRATO - DDL 52
- EXPANDER 54
- FAST PITCH SHIFT 56
- GATED REVERB 58
- GUITAR AMP 1, GUITAR AMP 2 61
- GUITAR AMP 3 63
- GUITAR AMP 4 65
- GUITAR TUNER 2U 67
- HALL REVERB 68
- INVERSE EXPANDER 71
- KEYED EXPANDER 73
- LARGE PLATE 75
- LARGE ROOM REV 77
- MULTI TAP DELAY 80
- NO EFFECT (BYPASS EFFECT) 80
- NON LIN REVERB 1, 2, 3 82
- PARAMETRIC EQ 85
- PHASER-DDL 86
- PITCHSHIFT - DDL 90
- REVERSEREVERB1 94
- REVERSE REVERB 2 96
- ROTATING SPEAKER 98
- RUMBLE FILTER 100
- SINE/NOISE GEN 101
- SMALL PLATE 102
- Section 2 — Algorithms 103
- SMALL ROOM REV 104
- SPEAKER CABINET 107
- TEMPO DELAY 108
- TUNABLE SPKR 1 109
- TUNABLE SPKR 2 110
- VAN DER POL FILTER 112
- VCF - DISTORT 1 113
- VCF - DISTORT 2 115
- VOCAL REMOVER 117
- Audio Out 119
- Section 3 — Config Parameters 122
- Selecting a Config Preset 125
- Editing a Config Preset 125
- 1 Source Config 126
- Available ABCD Routings 128
- Feedback 129
- 2 Source Config 131
- 3 Source Config 133
- 4 Source Config 135
- Section 5 — Storage 136
- Internal Storage 137
- Saving Presets 138
- Advanced Features 140
- Copying Presets 142
- MIDI System Exclusive Storage 143
- MIDI Data Xfer 144
- Please Wait! 144
- *** WRITE *** 144
- *** OK **** 144
- All Preset Banks 145
- Dump Received 145
- Problems? 145
- Section 6 — Presets 148
- Quick Steps to Hear Presets 150
- To Select 1 Unit Presets: 150
- To Select 2 Unit Presets: 150
- To Select 4 Unit Presets: 150
- To Select Config Presets: 150
- 1-Unit RAM Presets 151
- 1-Unit ROM Presets 153
- 2-Unit RAM Presets 155
- 2-Unit ROM Presets 157
- 4-Unit RAM Presets 159
- 4-Unit ROM Presets 161
- Config RAM Presets 163
- Config ROM Presets 165
- Appendix 168
- Glossary 170
- Feedback 1 173
- Physical 180
- Dimensions 180
- Specifications 181
- DP/4+ Index 182
- Song/Step Worksheet 198
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