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Symetrix 258E Скачать руководство пользователя страница 38

528E

36

Troubleshooting

Chapter 10

Troubleshooting Chart

SYMPTOM

PROBABLE CAUSE

No output

Check cables and connections.

Are inputs driven by outputs, and outputs driving inputs?

Verify cables, source and load by patching input and output
connections together at the unit.

Check for AC power presence. Power LED on?

Check output by plugging headphones into output connector
(use an adapter).

Are the LED displays operating?

Is the 528E set for mic-level output?

Is the M

IC

/L

INE

switch set correctly?

Hum or buzz in output

Check input and output connector wiring (refer to Figure 9-1).

Ground loop. Check related system equipment grounding. Are
all system components on the same AC ground?

Distortion

Check input signal. Is it too hot, or is it already distorted?

Is the O

UTPUT

display indicating clipping ?

Is the input clipping?

Check output loading. Should be above 600 ohms?

Are the power amplifiers clipping?

Is something else clipping?

Is the 528E set for mic-level output, driving a line-level input,
with the 528E’s gain set fairly high and upstream devices
contributing a significant amount of gain?

Noise (hiss)

Check input signal levels and level control settings.

The O

UTPUT

display should indicate signal up to but not

including the C

LIP

LED.

Check gain settings on upstream equipment.

Is the input signal already noisy?

The system gain structure should be such that the 528E
operates at or near unity.

Is the 528E set for mic-level output, driving a line-level input,
with the 528E’s gain set fairly high and upstream devices
contributing a significant amount of gain?

No LED displays

Is the unit plugged in and turned on?

Is the AC outlet OK?

No nothing

If you are using a condenser microphone, is the phantom
power switched on?

Do you have the proper input selected?

Is everything downstream really live?

If you are using the patching jacks, unpatch everything
temporarily to see if it is in your patch.

Is the D

OWNWARD

E

XPANDER

T

HRESHOLD

set too high?

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Содержание 258E

Страница 1: ...528E 528E Voice Processor User s Guide...

Страница 2: ...ts reserved Symetrix Part Number 53528 0E00 The information in this guide is subject to change without notice Symetrix Inc shall not be liable for technical or editorial errors or omissions contained...

Страница 3: ...ransformerless design The line input s design uses matched resistors to attain a high wideband CMRR common mode rejection ratio and multistage RFI filters to prevent Radio Frequency interference probl...

Страница 4: ...through the grounding conductor of the power cord To avoid electric shock plug the power cord into a properly wired receptacle before making any connections to the product A protective ground connect...

Страница 5: ...ront and rear panel as follows Follow these instructions to get your 528E up and running as quickly as possible The intent of this section is fast setup If you need something clarified then you ll fin...

Страница 6: ...threshold control to vary the amount of gain reduction as indicated on the compressor s gain reduction display Generally 3 to 6 dB is sufficient unless you are using a low compression ratio below 2 1...

Страница 7: ...ignal downstream yet still keeps the CLIP LED from illuminating The output display is peak responding so you can t quite set levels as if it were a VU meter The output CLIP LED monitors both the equal...

Страница 8: ...LED Display Indicates the amount of de esser activity at any instant in time Downward Expander Compressor EXP THRESH Sets the threshold level for the downward expander Signalsbelow this threshold are...

Страница 9: ...zer Output Section GAIN Sets the overall gain of the 528E s output over a 15 dB range Note the actual adjustment pointis intheexpander compressor s VCA whichispre EQ VOICE Inserts speech waveform asym...

Страница 10: ...alanced This is the output of the equalizer This jack does not interrupt the signal flow to the 528E s output stage INPUT TRS phone jack wired unbalanced This is the input to the equalizer This jack i...

Страница 11: ...upts the signal from the Mic Line inputs DE ESS INPUT P OUTPUT Preamp 48V POWER PHANTOM BYPASS MIC INPUT OUTPUT STAGE PRE AMP LINE INPUT PREAMP STAGE TRS phone jack wired unbalanced This is the output...

Страница 12: ...ftentimes the two are combined into a single device called a compressor limiter Compressor limiters usually perform as either a compressor or a limiter but not both at once Functionally a compressor l...

Страница 13: ...e dynamic range Why Dynamic Range Processors are Necessary For signals to stay below distortion and above noise their actual dynamic range must be kept within the specified dynamic range of the circui...

Страница 14: ...r simply makes all changes greater by some ratio which is sometimes user adjust able In the real world linear expanders aren t too practical because clipping occurs when signals just below maximum out...

Страница 15: ...trol range De essers usually include controls that allow the operator to determine which frequencies are controlled and how much those frequencies are actually attenuated The 528E s de esser controls...

Страница 16: ...ve 3 Cut or Boost is given in dB at the center frequency Equalization Tutorial Equalization is nothing more than selectively or not amplifying a signal based on frequency Since audio signals consist o...

Страница 17: ...tave 500 1024 Hz louder with respect to the other octaves the subjective result is a horn like quality If you emphasize the 7th octave 1000 2000 Hz the effect is one of tinniness The fundamental tones...

Страница 18: ...commercial reality you could still purchase mono and stereo versions of an LP and there were still more FM stations broadcasting in mono than stereo and as many mixers contained rotary mix pots as th...

Страница 19: ...e max CCW Tune the frequency control until you distinctly hear the part of the sound you wish to control Then adjust the cut boost control for the appropriate amount of change and readjust the bandwid...

Страница 20: ...change their sound simply by moving in or out from the microphone If clarity is your goal then a variable D4 microphone such as the EV RE 20 RE 27 or RE 18 or an omnidirectional type such as the EV R...

Страница 21: ...H HORN TRUMPET CLARINET OBOE FLUTE PICCOLO WIND INSTRUMENTS STRING INSTRUMENTS HUMAN VOICE BASS TREBLE 16 35 18 35 20 60 21 83 24 50 27 50 30 87 32 70 36 71 41 20 43 65 49 00 55 00 61 74 65 41 73 42 8...

Страница 22: ...tputs Pin 2 of the XLR connectors is Hot The sidechain access jack output uses a TRS jack wired as an insert jack tip return ring send The interstage patch points use TRS jacks with the ring and sleev...

Страница 23: ...HRES GAIN COMP THRES COMP RATIO OPTIONAL POWER SWITCH VOICE SYMMETRY IN OUT INTERNAL OUTPUT LEVEL SELECT SWITCH OUTPUT LEVEL DISPLAY EXP COMP IN OUT THRESHOLD DE ESS IN OUT EXP COMP OUTPUT EQ OUTPUT R...

Страница 24: ...strates the connections needed FRONTPANEL MIC INPUT BYPASS 48V POWER PHANTOM LINE INPUT PRE AMP OUTPUT STAGE INPUT OUTPUT SIDECHAIN RING SEND TIP RETURN INPUT DE ESS EQUALIZER INPUT OUTPUT BALANCED OU...

Страница 25: ...rear panel are several TRS jacks These jacks are the connections between the various processors that make up the 528E The jacks are half normalled which means that without any plugs inserted the sign...

Страница 26: ...STAGE OUTPUT PRE AMP DE ESS OUTPUT INPUT INPUT SIDECHAIN TIP RETURN RING SEND OUTPUT INPUT EXPANDER COMPRESSOR OUTPUT UNBALANCED OUTPUT OUTPUT STAGE INPUT EQUALIZER LIN Using the Equalizer in the Sid...

Страница 27: ...gnal peaks Remember to restore the settings of the various bypass switches Finally the OUTPUT GAIN After adjusting all of the other processors set this control so that the 0 VU LED on the OUTPUT LEVEL...

Страница 28: ...ce content of the input signal In sibilant speech the dominant frequency component is the sibilance itself Reducing the level of high frequencies during periods of sibilance reduces the level of the s...

Страница 29: ...or less to certain frequencies Because the audio signal and the control signal remain completely separate even while the control circuit tells the VCA whether to turn the gain up or down you can equa...

Страница 30: ...t all proper in another Announce Mics Compressing Limiting Expanding The 528E s dynamic range processor is used to control both over modulation and noise Noise in this case may be electrically induced...

Страница 31: ...of each of the compressor controls 2 Temporarily set the compressor ratio to 10 1 Increase system gain very carefully until a feedback frequency becomes slightly audible 3 With the bandwidth set at a...

Страница 32: ...ponse characteristic at higher frequencies Check the off axis curve the lower one in the manufacturer s literature If there s only a 3dB to 6dB difference between the on axis front response and the of...

Страница 33: ...l which in turn can cause feedback in the absence of signal when the compressor releases and brings the gain back up to normal The 528E s interactive dynamics processor allows the use of large amounts...

Страница 34: ...s lines are not necessarily low impedance Similarly although 1 4 inch jacks are typically used for things like guitars which are high impedance and unbalanced this does not predispose them to only thi...

Страница 35: ...ways line level and is unaffected by the internal switch I O Impedances The 528E is designed to interface into almost any recording studio or sound reinforcement applica tion This includes 600 ohm sys...

Страница 36: ...l output level switch Unlike the XLR connector using this jack corrects the gain so that it is unity The interstage patching jacks are half normalled only the input jack breaks normal TRS jacks wired...

Страница 37: ...T TYPICAL OF SYMETRIX PRODUCTS FROM BALANCED OUT FROM UNBALANCED OUT FROM BALANCED OUT FROM BALANCED OUT FEMALE XLR PIN 1 GROUND PIN 2 HIGH PIN 3 LOW MALE XLR PIN 1 GROUND PIN 2 HIGH PIN 3 LOW MALE TS...

Страница 38: ...power amplifiers clipping Is something else clipping Is the 528E set for mic level output driving a line level input with the 528E s gain set fairly high and upstream devices contributing a significan...

Страница 39: ...um Boost Cut 15 dB Metering Type Multi segment LED bar graph Output Level 20 to 3 VU 0 VU 4 dBu VU calibrated peak responding Gain Reduction Separate displays for de esser downward expander and compre...

Страница 40: ...cessor shall be equipped with the following LED displays An eight segment LED display shall be provided for monitoring the overall output level six segment displays for monitor ing the de esser compre...

Страница 41: ...will be returned freight collect THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED ARISING BY LAW OR OTHERWISE INCLUDING WITHOUT LIMITATION ANY OBLIGATIONS OF THE SELLER W...

Страница 42: ...ed for all necessary parts labor packaging materials and freight charges To Get Your 528E Unit Repaired USA Customers Only 1 Call our Technical Services Group for a return authorization RA number 425...

Страница 43: ...three 6 32 x 1 2 inch screws from each side of the chassis 4 Lift the top cover free of the chassis Changing the XLR Output to Microphone Level The 528E ships from Symetrix with the XLR output configu...

Страница 44: ...ed apparatus for household and similar general use EN 55103 2 Electromagnetic compatibility Generic immunity standard Part 1 Residential commercial and light industry The technical construction file i...

Страница 45: ...528E 43...

Страница 46: ...528E 44 Symetrix Inc 6408 216th St SW Mountlake Terrace WA 98043 USA Tel 425 778 7728 Fax 425 778 7727 Web site www symetrixaudio com Email symetrix symetrixaudio com...

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