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Seeburg SP2, Owner'S Manual

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4  Appendix 

4.1  Tables 

SIP-re sisto r-

Fre q ue ncy

a rra y

X-Ove r

EQ1

EQ2

EQ3

EQ4

470

2400

330

1250

7000

19000

560

2100

305

1100

6400

17500

680

1600

280

1000

6000

16000

820

1400

290

920

5700

15500

1K

1200

240

880

5000

13500

1,2K

1000

205

800

4250

11500

1,5K

800

185

700

3800

10500

1,8K

750

162

610

3200

9200

2,2K

530

140

525

2850

8000

2,7K

430

120

450

2500

6750

3,3K

370

105

400

2200

5850

3,9K

310

90

350

1800

5000

4,7K

260

76

300

1600

4250

5,6K

220

65

250

1400

3700

6,8K

170

55

210

1200

3100

8,2K

150

45

175

1000

2700

10K

130

38

150

825

2250

12K

105

32

125

700

1800

15K

85

28

100

565

1500

18K

70

25

85

460

1250

20K

65

20

75

430

1150

 

Table 1  SIP resistor values and the corresponding  3 dB points of the frequency dividing network and EQ 

center frequencies. 

Resistor values given in ohms (

Ω

). 

Frequencies given in hertz (Hz). 

The  resistor  values  are  usually  coded  with  three  numbers  on  the  SIP  housing.  The  two  most 
significant  digits  represent  the  resistor  value.  The  third  number  determines  the  magnitude  by 
defining the number of zeroes that must be attached to number one and two. 

Examples: 

222:     2200 

Ω

 = 2,2 k

Ω

 

 

 

153:   15000 

Ω

 = 15 k

Ω

 

Summary of Contents for SP2

Page 1: ...SEEBURG acoustic line active systempanel 2 owner s manual ...

Page 2: ...tion 4 3 1 4 Highmid attenuator 5 3 1 5 MONO Bass option 6 3 2 Limiter operation 6 3 3 Subsonic and ultrasonic filters 7 3 4 Optional equalizer PC card 7 3 4 1 Adjustment of the EQ center frequencies 7 3 4 2 Adjustment of the filter Q 9 3 4 3 Filter gain 9 4 APPENDIX 10 4 1 Tables 10 4 2 Note chart for SP2 configurations 12 4 3 Factory presets 13 4 4 SP2 specifications 14 4 5 EQ card specification...

Page 3: ...y configurable as well as a connection panel and still takes up only one rack space Fig 1 How the SP2 is hooked up only one channel pictured A detailed illustration of the SP2 s functional blocks which can be seen in the following figure fig 2 Fig 2 Block diagram of the SP2 If you bought the SP2 together with or as an upgrade for an acoustic line PA system it is already set up for optimum performa...

Page 4: ... find the following connectors and indicators audio in channels A and B The SP2 s input channels A and B which are connected to a mixer s stereo outputs link to next panel channels A and B Feed through of the input signals which is provided for connecting another SP2 or a power amp Power on LED Indicator lights up when ac power is present Signal A B LED Indicators light up when the input signal le...

Page 5: ...SEEBURG acoustic line SP2 Owner s Manual Page 3 Fig 3 Front panel facilities Fig 4 Rear panel facilities ...

Page 6: ...ncy response curves Please choose your SIP values according to table 1 in the appendix 3 1 2 Filter falloff In addition to the filters 3dB points you can also adjust the steepness of the filter falloff in their respective passband to stopband transition ranges It can be chosen separately for each filter to yield either 12dB octave or 24 dB octave The adjustment is performed by moving the blue jump...

Page 7: ... center is 0 115m behind the 12 speaker s acoustical center The crossover frequency is 1500 Hz The necessary phase correction then amounts to Φ 0 115 360 1500 340 182 180 1 64 m s m s 3 1 4 Highmid attenuator The attenuator function makes it possible to reduce the highmid gain relative to the woofer gain in steps of 2 5 dB This feature comes in handy if your bass speakers are less efficient than y...

Page 8: ...p signal through the unit it is possible to detect the actual power delivered to the speakers This power detection is indispensable for proper limiter operation see also fig 1 The time constants are set by placement of the blue jumpers in the limiter section The jumper sockets are labeled A B and C corresponding to fast medium and slow attack release times The actual time constants are different f...

Page 9: ...qualize your system s frequency response at adjustable center frequencies with a free choice of the signal path woofer or highmid where you want to attach each EQ band to The only limitation here is a maximum of 3 out of 4 available EQ bands per signal path The insert points for the individual filter sections are labeled EQ Insert on the PC motherboard Unused insert points must be short circuited ...

Page 10: ...Fig 9 Measured frequency response curves for EQ1 Fig 10 Measured frequency response curves for EQ2 Fig 11 Measured frequency response curves for EQ3 ...

Page 11: ...ioning the yellow jumpers on the EQ PC board The corresponding connectors are labeled Bandwidth There is a choice of three filter Qs Peak Q 12 yellow jumper left Normal Q 3 yellow jumper center Shelve Q 1 5 yellow jumper right The resulting characteristic curves are shown in fig 13 Fig 13 Characteristic curves of the EQ filters with three different Q factors preset 3 4 3 Filter gain The filter gai...

Page 12: ...3700 6 8K 170 55 210 1200 3100 8 2K 150 45 175 1000 2700 10K 130 38 150 825 2250 12K 105 32 125 700 1800 15K 85 28 100 565 1500 18K 70 25 85 460 1250 20K 65 20 75 430 1150 Table 1 SIP resistor values and the corresponding 3 dB points of the frequency dividing network and EQ center frequencies Resistor values given in ohms Ω Frequencies given in hertz Hz The resistor values are usually coded with t...

Page 13: ...2312 O N OFF OFF OFF ON 72 324 648 1296 2592 OFF ON OFF OFF ON 76 361 722 1444 2888 ON ON OFF OFF ON 80 400 800 1600 3200 OFF OFF O N OFF ON 84 441 882 1764 3528 ON OFF O N OFF ON 88 484 968 1936 3872 OFF ON O N OFF ON 92 529 1058 2116 4232 ON ON O N OFF ON 96 576 1152 2304 4608 OFF OFF OFF ON ON 100 625 1250 2500 5000 ON OFF OFF ON ON 104 676 1352 2704 5408 OFF ON OFF ON ON 108 729 1458 2916 5832...

Page 14: ...4 2 Note chart for SP2 configurations Fig 14 Simplified SP2 layout can be used as a note chart for controller configurations ...

Page 15: ...kΩ Insert Woofer Bandwidth normal jumper centered Gain 0 dB trimmer in center position EQ 2 Center frequency SIP 210 Hz 6 8 kΩ Insert HighMid Bandwidth normal jumper centered Gain 0 dB trimmer in center position EQ 3 Center frequency SIP 3200 Hz 1 8 kΩ Insert HighMid Bandwidth normal jumper centered Gain 0 dB trimmer centered EQ 4 Center frequency SIP 13500 Hz 1 kΩ Insert HighMid Bandwidth normal ...

Page 16: ...18 kHz 18 dB octave Output impedance Signal to Amp 600 Ω Input impedance Audio In 40 kΩ AC mains power draw 230 Volt AC 10 VA EQ inc Dimensions w x h x d 482 x 440 x230 mm Weight 3 4 kg 4 5 EQ card specifications Gain 12 dB Frequency bands EQ1 20 330 Hz EQ2 75 1250 Hz EQ3 430 7000 Hz EQ4 1150 19000 Hz Specifications subject to change without notice ...

Page 17: ...els Since a decibel is a logarithmic measure it can only express the ratio of two signals and no absolute values By definition the ratio of two power levels is L dB P P p 10 0 log With the help of a known impedance this can be expressed in voltages as follows L dB U U u 20 0 log The reference voltage U0 in audio electronics is by convention 0 775V The reference power level P0 is usually assumed to...

Page 18: ...es in the vicinity of the resonance peak stronger than one with a high Q So if you want to control only a very narrow frequency band you have to choose a very high Q filter However in many applications it is desired to affect a wider range for example a broad bass boost between 50 and 150 Hz in a PA system which can be achieved with a low filter Q see fig 17 The filter Q for electrical resonant ci...

Page 19: ...SEEBURG acoustic line GmbH Auweg 32 D 89250 Senden Freudenegg www acoustic line de ...

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