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PASSEQ

Version 1.2 – 12 / 2017 

2

Package Contents 

2

Introduction 3

King of the passive equalizers 

3

Technical Aspects 

4

120 Volt Technology 

4

120 Volt Technology - Diagrams 

5

The Basics of Frequency Filtering 

6

Filter Types 

6

Shelf Filters 

6

Peak Filters 

6

Bandwidth 6
Passive EQs 

7

Installation 8

Voltage Selection 

8

First Steps 

8

Cabling: Rear Side 

9

XLR inputs and outputs 

9

Control Elements 

11

Layout of Control Elements 

12

Frequency 12
LF+ and LF- 

12

MF+ and MF- 

13

HF+ and HF- 

13

Q (HF+ Band) 

13

Gain 14
Output 14
Channel Switch 

14

Auto Bypass 

14

Recommendations on using Equalizers 

15

Basic Approaches and Working Techniques 

15

EQ Yin & Yang 

15

First cut, then boost 

15

Specifications

16

Measurements 16

Security Advices 

17

Contact 19

Summary of Contents for Passeq

Page 1: ...PASSEQ Passive Mastering Equalizer Test Report Manual Handbuch...

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Page 3: ...PASSEQ Passive Mastering Equalizer Manual...

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Page 5: ...dth 6 Passive EQs 7 Installation 8 Voltage Selection 8 First Steps 8 Cabling Rear Side 9 XLR inputs and outputs 9 Control Elements 11 Layout of Control Elements 12 Frequency 12 LF and LF 12 MF and MF...

Page 6: ...are under continuous development and improvement Technical specifications are subject to change Package Contents PASSEQ Passive Mastering Equalizer Power cord Manual The PASSEQ Equalizer is available...

Page 7: ...hoice of frequencies All passive filter components variable resistor capacitor and coil deliver excellent sonic characteristics An important part of this process is played by coil and condenser loadin...

Page 8: ...ring DVD in the USA Simon Heyworth s Super Audio Mastering in the UK Galaxy Studios in Belgium and the legendary Wisseloord in the Netherlands for instance The 120 volt technology is based on op amps...

Page 9: ...to doubling the acoustic power 6 dB correspond to twice the sound pressure level and 10dB correspond to twice the perceived loudness When it comes to volume the 120 volt technology exhibits a performa...

Page 10: ...is usually about 3dB less with the overall increase set to maximum This gives the typical rising form of the shelf filter s response curve Peak Filters A peak filter boosts or cuts a chosen frequency...

Page 11: ...l energy of the attenuated signal level though it is not part of the actual filter circuit Passive filters react differently than active filters mostly due to the saturation and load ing characteristi...

Page 12: ...wer cord to the 3 pin IEC socket The transformer power cord and IEC socket all comply to the VDE UL and CSA regulations The PASSEQ should not be installed in close proximity to equipment that emits ma...

Page 13: ...ection is necessary the correct polarity of the conductors needs to be observed Ground Lift switch to avoid ground loops On the rear panel of the PASSEQ Mastering Equalizer see page 10 is also a GND L...

Page 14: ...MAINS XLRs Balanced 4dBu 1 GND 2 HOT 3 COLD WARNING AVIS RISQUE DE CHOC LECTRIQUE NE PAS OUVRIR RISK OF ELECTRIC SHOCK D O N O T O P E N CAUTION Serial Number Made in Germany 115VAC 230VAC 50Hz 60Hz P...

Page 15: ...1 6 5 1 7 0 0 2 0 3 0 6 1 1 1 7 2 6 3 8 5 7 9 2 1 2 5 0 0 2 0 5 1 1 7 2 6 3 8 5 3 7 7 1 1 1 4 5 1 0 0 9 0 8 0 7 0 6 0 45 0 35 0 2 5 0 1 7 0 1 2 0 1 Interval dB dB dB dB dB dB dB Hz Hz Hz Hz Hz Hz pass...

Page 16: ...LF band encom passes a range of 10Hz to 550Hz The maximum available increase in this LF boost band is 17 dB while the maximum reduction of the LF band is 22dB Optically these filter bands may be repre...

Page 17: ...ations result in slightly differing sonic characteristics Q HF Band Like already mentioned in the last chapter with the HF Band you got the possibility to change the Q factor value thus the bandwidth...

Page 18: ...e the out put level up to 10dB These controls are also 41 step detented potentiometers Channel Switch The two centrally located orange lit switches activate or deactivate the corresponding left and ri...

Page 19: ...n and Yang principal means ideally to consider always such implied repercussions of work in one frequency for example that in working to enhance warmth that one might want to avoid losing presence Har...

Page 20: ...B C 91 8 dBu Noise A weighted Gain 0 dBu EQ 0dB B C 95 2 dBu Noise CCIR Gain 0 dBu EQ 0dB B C 86 2 dBu THD N Gain 0 dBu EQ 0dB B C 102 dB Common Mode Rejection 60dBu at 1 kHz Gain 0 dBu EQ 0dB B C Tr...

Page 21: ...of time Unplug the power chord from the mains to cut power supply to the unit Always make sure that the mains plug is easily accessible Opening the unit Simply put DON T if you are not a certified SPL...

Page 22: ...ts or those with identical specifications as the originals Incorrectly substituted parts can lead to fire electrical shock or other dangers including further equipment damage Safety inspection Be sure...

Page 23: ...copied or reproduced in any manner in part or fully without prior authorization by SPL Sound Performance Lab SPL con tinuously strives to improve its products and reserves the right to modify the prod...

Page 24: ...0 17 0 12 0 1 I n t e r v a l dB dB dB dB dB dB dB Hz Hz Hz Hz Hz Hz passive mastering equalizer PASSEQ Sound Performance Lab Model 1650 A Wolf Neumann Design Q HF HF MF MF LF LF Output 120V DC Audio...

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