Crane Song IBIS User manual

LTD.
2117 East 5th Street
Superior, WI 54880 USA
tel: [phone]
fax: [phone]
www.cranesong.com
OPERATOR'S MANUAL
Version (-0.8)
Dec 28, 2007
© 2007 Crane Song, LTD. Subject to change without notice. Printed in the U.S.A.

THE BASICS
The IBIS equalizer can do some very different things.
First, each band has 24 frequencies. 12 switch positions and a “+ one step button” this
button moves the frequencies up one whole musical step. The high and low bands also
can be shelving by pushing the shelving button.
The frequency chart showes how each of the bands over lap and how frequencies and
musical notes relate. As an example, with the +1 step button pushed in, the frequency
moves up two positions on the chart. 32.7 Hz which is the lowest frequency will become
36.7 Hz
There is a dead zone of about plus and minus .3 db on the “boost / cut” controls where the
EQ is flat in response. This allows an easy way to set your bands flat. The range is plus
or minus 12 db and is not stepped. The mastering version has a range of 6 db in .5 db
steps with a 1 db step between 5 and 6.
The Bandwidth is not stepped on the standard version and is steped on the mastering
version. the range is from 0.2 Oct to 4 Oct this is at 12 db of boost
The low cut is 12 db per octave, but the steep button increases the slope to 24 db per
octave.
The filters are of a special type that provide a very clean and smooth sound. To add
flexibility to the equalizer a color knob is inculuded.
The color knob is an additive second / third harmonic distortion type of process,
it can be applied to the full program or any one of the 4 bands. When doing a “cut” it will
subtract the harmonic content. The Color Knob is not stepped on the standard version
and is stepped on the mastering version
The use of the color function will allow you to change the equalizer from a very transparent
sound to a colored sound. Using it on the low frequencies, band 1, it will add warmth. On
band 3 it will add presence and some nice upper midrange detail. On the high frequency
band it will add air.

C
32.7 65.4
131 262
523
1047 2093 4186 8372
16744
34.6 69.3
139 277 554
1109
2218 4435 8869
17740
36.7 73.4
147 294
587
1175
2349 4699
9397
18794
38.9 77.8
155.6
311
622
1245
2489 4978 9956
19912
41.2 82.4
165 330
659
1319 2637 5274
10548 21096
43.7 87.3
175 349 698
1397
2794 5588
11175
740
1480 2960 5920
11839
784
1568 3136 6272
12544
830
1661 3322 6645
13289
880
1760
3520 7040
14080
932
1865 3729
7459
14917
988
1976 3951 7902
15804
C# D D# E F F# G G# A A# B
46.2 92.5
185 370
49 98
196 392
51.9
104 208 415
55
110
220 440
58.3
116.6
233
466
61.7
123.5
247 494
IBIS FREQUENCY CHART
Band 1 + 1 step lowest frequency is 36.7 Hz Band 2 + 1 step lowest frequency is 155 Hz Band 3 + 1 step lowest frequency is 523 Hz Band 4 + 1 step lowest frequency is 1760 Hz

BAND 1 EQ CURVES
This graph showes band 1 the low frequency band, The peaking curve is at a bandwidth
1.5 octaves and is for reference. The shelving curves are with the shelf button pushed in.
Only one frequency is showen for clarity

BAND 4 EQ CURVES
This graph showes band 4 the high frequency band, The peaking curve is at a bandwidth
1.5 octaves for reference. The shelving curves are with the shelf button pushed in. Only
one frequency is showen for clarity

BAND EQ CURVES PEAKING
This graph showes a typical peaking eq curve. This was measured on band 3.
Only one frequency is showen for clarity. There are several boost and cut levels at differ-
ent bandwidths. These curves apply to all 4 bands for a total of 96 different frequencies.

LOW CUT EQ CURVES
This graph showes a typical low cut curve. Three frequencies are showen for clarity. Each
showing the 12 db pre octave slope and the 24 db per octave slope. Frequencies of 40 ,
80, and 150 Hz are showen.

LOW CUT EQ CURVES
This graph showes the range of the low cut curves. All frequencies are at the 24 db per
octave slope.

IBIS INSERT CONNECTOR
If you are going to use this, use it with caution. The inserts are a loop and must be
normaled for the band to work correctly. If there is a phase inversion in the inserted device
it is possible that the system will be an oscillator. This will not hurt Ibis, but your Speakers.
boost / cut amp
filter
Send
Return
Insert
IBIS INPUT IBIS OUTPUT
There are 4 filter circuits in parallel in Ibis. When using the insert with a compressor you
are modifing the filter output before is sums back into the audio path. The inserts are
unbalanced

INTERFACING - SPECIFICATIONS
Input: Floating, balanced. Maximum input is +25 dBm.
The connectors are XLR.
Output: Floating, balanced. Maximum output is +25 dBm.
The connectors are XLR.
Input and Output : Pin 2 is Sig + , Pin 3 is Sig- , Pin 1 is GND
Connections
Power: 100, 120, 230,240 volt; 50/60 Hz; 55 watts
MDL .6A Fuse for 100V and 120V
MDL .3A Fuse for 230V and 240V
Noise: Measured with the eq set flat and the bandwith controls at max
-85dbm
Clipping: +25 dbm
Distortion: With the eq set flat measured at +20 dbm 0.001%
Pilot Lamp: # 327
Shipping
Weight: 19 lbs. (8.6 kg)
Depth
Behind Panel: 12.5 inches (31.75 cm) plus cabling
Panel Height: 2 rack spaces
Frequencies: There are 24 frequencies per band for a total of 96 frequenices
with the bands overlapping. They are stepped on both the mastering
and standard units
Boost-Cut: The standard equalizer has a range to plus or minus 12 db on each
band. The Mastering version has a range of plus or minus 6 db
This is stepped 0.5 db steps to 5 db and a 1 db step to 6db on the
mastering version.
Bandwith: Bandwidth in octaves is measured at full boost. The maximun is 4
octaves and a minimun is 0.2 octaves. This is a Q range from 0.15 to
17 On the mastering unit this is stepped with 12 steps.