Seeburg SP2 Owner's Manual
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Seeburg SP2 Owner's Manual

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SEEBURG acoustic line
active systempanel 2
owner´s manual

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

  • Page 2: Table Of Contents

    3.4 Optional equalizer PC card 3.4.1 Adjustment of the EQ center frequencies 3.4.2 Adjustment of the filter Q 3.4.3 Filter gain 4 APPENDIX 4.1 Tables 4.2 Note - chart for SP2 configurations 4.3 Factory presets 4.4 SP2 specifications 4.5 EQ card specifications 4.6 Glossary...

  • Page 3: Introduction

    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 performance with this specific system. For use with all other brand names there is a modifiable standard configuration which is described in appendix 4.3.

  • Page 4: How To Use This Manual

    1.1 How to use this manual This owners manual is written to assist you in setting the SP2 up in a way that lets you get the most out of it. To this end we think it is useful to give a concise description of the SP2’s general mode of operation.
  • Page 5 SEEBURG acoustic line SP2 Owner’s Manual Page 3 Fig. 3 Front panel facilities Fig. 4 Rear panel facilities...

  • Page 6: Operating The Sp2

    All SP2 inputs and outputs are electronically balanced. A balancing transformer can be installed as an option if DC isolation is a requirement. If you wish to have this modification installed in your SP2 please contact your authorized SEEBURG acoustic line dealer.

  • Page 7: Highmid Attenuator

    20° Celsius c is 340 m/s. The temperature coeff icient is 0.6 (m/s)/° C). Example: You want to control a monitor with two 12’’speakers and a 2’’driver with the SP2. The 2’’ driver’s acoustical center is 0.115m behind the 12’’speaker’s acoustical center. The crossover frequency is 1500 Hz.

  • Page 8: Mono-Bass Option

    3.2 Limiter operation The SP2 incorporates 4 independent limiters ( HighMid CH. A and CH. B, Bass CH. A and CH. B). For each of these you can preset one of 3 different attack/release time constants as well as the maximum allowable speaker output power.

  • Page 9: Subsonic And Ultrasonic Filters

    Fig. 8 Characteristic curve of the SP2 limiter. The limit indicator LED lights up at point A. The compression ratio increases with an increasing input signal (area between A and B). The maximum compression ratio of 1:20 is reached beyond B.
  • 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: Adjustment Of The Filter Q

    Fig. 12 Measured frequency response curves for EQ4 As can be seen in fig. 9 through fig. 12, there is a falloff of the zero amplitude curves below 50 Hz and above 15 kHz. This is due to the subsonic/ultrasonic filters, which are always in operation (see section 3.3).

  • Page 12: Appendix

    4 Appendix 4.1 Tables SIP-re sistor- Freq uency a rray X-Over 2400 1250 7000 19000 2100 1100 6400 17500 1600 1000 6000 16000 1400 5700 15500 1200 5000 13500 1,2K 1000 4250 11500 1,5K 3800 10500 1,8K 3200 9200 2,2K 2850 8000 2,7K...
  • Page 13 Co nfig ura tio n T hre sho ld P 16 OFF OFF OFF OFF OFF O N OFF OFF OFF OFF OFF O N OFF OFF OFF O N OFF OFF OFF OFF OFF O N OFF OFF O N OFF O N OFF OFF OFF O N O N OFF OFF O N OFF OFF...

  • Page 14: Note - Chart For Sp2 Configurations

    4.2 Note - chart for SP2 configurations Fig. 14 Simplified SP2 layout can be used as a note chart for controller configurations.

  • Page 15: Factory Presets

    4.3 Factory presets SP2 units which have not been delivered as part of a SEEBURG acoustic line sytem are factory preset as follows: X-over: 3 dB point (SIP): 105 Hz (12 kΩ) Filter falloff: 24 dB/oct. Phase angle HighMid and Woofer: 0°...

  • Page 16: Sp2 Specifications

    4.4 SP2 specifications SNR (at 6 dB gain): > 103 dB (EQ included) THD (at 6 dB gain): < 0,04 % Headroom: 22 dBU subsonic/ultrasonic filters: -3 dB points at 25 Hz and18 kHz -18 dB/octave 600 Ω Output impedance (Signal to Amp): Input impedance (Audio In): 40 kΩ...

  • Page 17: Glossary

    4.6 Glossary • Compression ratio: Compressors limit the audio signal amplitude whenever it surpasses a certain preset threshold level. The characteristic curve’s slope equals 1 below this threshold, meaning that the output amplitude is the same as the input amplitude. At the threshold point the curve has a knee, beyond which the slope decreases with increasing compression ratio.
  • Page 18 Fig. 16 Two waves of equal amplitude, frequency and phase add up to a wave of twice the amplitude (a). • Filter Q: The quality factor (Q) of a resonant filter is a measure for the sharpness of the resonance peak that can be realized with this circuit. Every equalizer contains a number of electric resonant filters.
  • Page 19 SEEBURG acoustic line GmbH Auweg 32 D-89250 Senden/Freudenegg www.acoustic-line.de...

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