Welcome to Ebenezer’s Sound Tech Training. I’m sure this thing worked last Sunday. The Importance of Acoustics. What did he say?. The Effects of Too Much REVERBERATION. Impacts spoken word more than music. Impacts those with hearing loss the most.
I’m sure this thing worked last Sunday
What did he say?
The congregation needs to listen to the main speakers, not the monitors!
Two minutes prior to start of service is NOT the ideal time to begin a trouble-shooting process!
Avoid damaging “POPS” - always turn power on or off in the order indicated!
NEVER CONNECT OR DISCONNECT MICROPHONES OR INSTRUMENTS….
Unless the channels are muted or the system is off.
Pops, clicks, and buzzes can damage speakers!
Small round shielded cable for instruments
Large flat unshielded cable for speakers
70 Volt Amp
70 Volt Amp
From Signal Sources
You can cause real problems with the system.
Setting them requires the proper test equipment!
Both must be on at all times!
Mixer Rear Panel, lower left corner
The Mono Channel Strip
Learn one and you know all twenty.
Signal Flow Top to Bottom
TURN DOWN THAT TRIM!
If the red OL light comes on then your trim control is set too high!
What is ample HEAD ROOM?
No, its not having enough rest rooms on a ship!
Clipping Causes Distortion…..
…..and distortion can blow your speakers!
If you go “ouch” after that last squeal, chances are so did your speakers!
caused by plugging/unplugging hot mikes or instruments!
Always mute the channel at the mixer first!
The Traditional Way….
Back down from clipping and hope for the best.
Never mix choir mikes into the stage monitors!
Feedback will be too difficult to control.
I wish I hadn’t done that!
You get a break - we don’t use it!
Please make sure the
PRE button is out.
This places AUX 3 and
AUX 4 in the post-fader mode.
Joe’s Rental Video
One or two tick marks is usually enough.
Always cut, never add EQ
It avoids feedback
Controls High Frequencies
Too much high - cut a little
Controls Low Frequencies
Too much bass - cut a little
If you get confused…..
Just put the EQ knobs to their center positions. The system should sound acceptable with the EQ flat.
The LOW CUT button reduces very low frequencies.
Depress it to reduce handling and wind noise on hand-held, wireless and pulpit mikes.
Leave it up for choir mikes and instruments.
and learn more about how EQ works
Note: The mixer in the video is different than ours but it demonstrates the concept of EQ very well.
Since we combine the mixers left and right stereo channels into a single monaural output, the PAN controls do nothing.
Simply leave the PAN controls centered.
TURN DOWN THE TRIM!
You have signal - all is well….
Signal Buss Company
If you don’t assign the channel to a BUSS, the signal won’t go anywhere!
For simplicity, always assign to the main L-R buss.
Now you know how to control 20 of the 24 channels
Only 4 more to go!
Instead of swept EQ for the mid range, channels 21/22 and 23/24 have separate HI MID and LOW MID controls.
Set these for the desired effect just like you do for the HI and LOW EQ controls.
Now for the output side of the mixer.
Don’t let it scare you - we don’t use most of it!
There are 6 AUX SEND MASTERS
One for each buss. Remember….
1 - Stage monitors.
2 - Fold-back monitor.
3 - Not used.
4 - CD/Tape.
5 - Service tape recorder.
6 - VCR record.
Signal Buss Company
The channel AUX determines how much signal gets on the buss.
The AUX SEND MASTER determines how much signal gets off the buss.
Need more keyboard in the monitor mix - turn up AUX 1 on the keyboard channel.
Need more of everything in the monitor mix - turn up the AUX 1 SEND MASTER.
Each AUX SEND has a SOLO button.
Want to hear what’s going to the monitor speakers? Press the AUX 1 Send Master SOLO button. You’ll hear the whole mix.
The VU Meter also reads the level of the signal going to the monitor speakers while the SOLO button is pressed.
Flashes to warn you when the VU meter is reading a SOLO channel signal, rather than the main L-R signal.
Sets the level of signal coming over the solo buss.
Normally, set it about half way (U).
Pressing TAPE RETURN TO PHONES will kill all headphone output.
Pressing TAPE RETURN TO MAIN MIX will kill all main speaker output.
Adjust for a comfortable headphone level.
Note: C-R stands for Control Room.
Adjusts the overall level going to the main and classroom speakers.
Adjust talkback level here
Push MAIN MIX for main speakers
Push AUX 1&2 for stage and foldback speakers
Use only name brand alkaline or lithium batteries
in the wireless mikes!
Direct and Multipath signals cancel at antenna B.
Receiver picks antenna A which still has a good signal.
The distance between microphones is at least 3 times the distance between the singer and his microphone.
When two or more microphones pick up the same sound source from different distances, Comb-Filtering is the result.
Due to the difference in sound travel time, certain frequencies cancel when combined at the mixer.
Comb-Filtering makes the signal sound “hollow”
6 - 9 FT
6 - 9 FT
Always use the minimum number of mikes necessary to cover the area.
Mikes are more directional at high frequencies so they exhibit more bass off-axis.
Never like this
Never use two when one will do!
LO-Z XLR Output
Instrument or Speaker Output
Instrument or Speaker Input
Also known as a “DI” Box
Lo-Z XLR Output to System
Hi-Z Input from Instrument
Only two connections are needed
Plug to monitor speaker
Used for the drummer
Normally used for recording
You never know if the person playing it back will have the Dolby capability.
If you don’t use Dolby to record then the tape is good to play back on any machine.
Tape Speed centered
and the Dolby is off.
.…or Speed Fixed
Press Music Search >>
Press Music Search <<
CD Track Select
Normally used for playback
Output Switch to MIX position
or their will be no output from the CD!
and the Dolby switch is off.
3. Press Track Number (use +10 for tracks greater than 9)
4. Press Play
1. Select Single or Continuous
2. Press Queue
and Fast Forward
Selects record or playback of left only, right only, or left and right channels.
L + R
Headset is for monitoring mixer.
This switch prevents the possibility of a feed-back loop during record.
A good way to check for defective cables….
I love it when
they do that.
Microphone Sales Guy
Audio from Mixer
Audio to Mixer
is located in the electric closet
He’s finally done!