background image

- Better sounding effects: reverb and delay effects sound a lot 

more transparent, when the bass and low midrange content of
the signal sent to their inputs is reduced.

- Recording guitars: when recording electric guitars, add some 

4kHz to distorted solo passages. This will make the lead 
stand out without interfering with other instruments in the mix. 
For powerful rhythm guitar, cut some of the midrange around 
1kHz. This will keep the guitar distinct in the background of 
the mix while leaving room for the vocals.

- More headroom: acoustic instruments often have a pronoun-

ced resonant peak at a certain frequency somewhere in the 
bass or low midrange. This phenomenon can make these 
instruments very hard to record as the recording level has to 
be adjusted quite low to avoid clipping. With this low recording
volume, all other frequencies will tend to sound weak in com-
parison. When using the GF equalizer, the disturbing resonant
frequency can be attenuated, which allows for an overall
higher recording level and a much more balanced sound.

5. Troubleshooting 

The following list contains the most common malfunctions and
the steps that have to be taken if they should occur. For
quickest success, follow the list in the given order until the desi-
red function is working. If all measures should fail to succeed,
send the unit in to the next authorized Zeck dealer for repair.
Do not try to repair the unit unless you are a qualified service
person.

owner's manual GF equalizers

17

owner`s manual GF equalizers © 1994 Zeck Audio

Problem

Troubleshooting procedures

'Power On' LED does not lit

- check 'Power' switch
- check mains connections
- unplug unit and check mains fuse
- check house fuses

No sound

- turn 'Power' switch off. If there is still no sound, the problem is not 

with the GF 215, but somewhere else in the signal chain

- turn 'Power' switch on again and activate 'EQ on' switch
- check incoming signal with gain control and 'Headroom' LEDs. If 

there is a signal, check output connections.

Faders do not work

- check 'Power' switch
- check 'EQ' on switch

Summary of Contents for constant Q GF215

Page 1: ... 10 0 Gain Channel 1 EQ in Low cut 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 12 0 dB 6 3 9 3 9 12 6 Clip 3 dB 6 dB 12 dB Signal H E A D R O O M Constant Q 2x30 Graphic EQ Clip 3 dB 6 dB 12 dB Signal H E A D R O...

Page 2: ......

Page 3: ...m paying particular attention to cords at plugs convenience receptacles and the point where they exit the Component 7 Non use Periods The power cord of the Component should be unplugged from the outlet when unused for a long period of time 8 Object and Liquid Entry Care should be taken so that objects do not fall into and liquids are not spilled into the inside of the Component 9 Damage Requiring ...

Page 4: ...rge trimmte Bandpaßmodule und Vielfach Summierungspunkte sorgen für ein Minimum an unerwünschten Phasenverschie bungen Die Filter im GF Equalizer sind als Constant Q Bandpässe ausgelegt bei denen die Bandbreite über den ganzen Stellweg des Faders gleich bleibt Im Gegensatz zum herkömmlichen Filterdesign mit nichtkonstanter Bandbreite zei gen Zeck GF Equalizer bei Maximalstellung aller Fader nur ei...

Page 5: ...60 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 25 40 63 100 160 250 400 630 1k 1 6k 2 5k 4k 6 3k 10k 16k 12 0 dB 6 3 9 3 9 12 6 Clip 3 dB 6 dB 12 dB Signal H E A D R O O M Constant Q 2x30 Graphic EQ Clip 3 dB 6 dB 12 dB Signal H E A D R O O M Clip 3 dB 6 dB 12 dB Signal H E A D R O O M ...

Page 6: ... 1 6k2 5k 4k 6 3k10k16k 25 40 63 100160250400630 1k 1 6k2 5k4k 6 3k10k16k 12 0 dB 6 3 9 3 9 12 6 Clip 3 dB 6 dB 12 dB Signal H E A D R O O M Clip 3 dB 6 dB 12 dB Signal H E A D R O O M R Mischpult power AP 1 800 2 x 900 W att Ster eo Power Amp Protect Limit Level ch 1 54 48 45 42 39 36 33 30 27 24 2118 15 12 9 6 3 0 51 5760 dB Protect Limit Level ch 2 54 48 45 42 39 36 33 30 27 24 2118 15 12 9 6 3...

Page 7: ...ave entspricht und beim GF230 1 3 einer Oktave Die folgende Tabelle zeigt den Zusammenhang zwischen den Nennfrequen zen der einzelnen Fader den entsprechenden nächstliegenden Musiknoten und dem Frequenzbereich GF 215 GF 230 Note 25 Hz 25 Hz G2 31 Hz H2 40 Hz 40 Hz D 1 Bass 50 Hz G1 63 Hz 63 Hz H1 80 Hz D 100 Hz 100 Hz G GF 215 GF 230 Note 125 Hz H 160 Hz 160 Hz d 200Hz g tiefe Mitten 250 Hz 250 Hz...

Page 8: ...er Equalizer richtig auf den betreffenden Raum abgestimmt Die folgende Abbildung zeigt wie ein sol cher Echtzeit Analyzer angeschlossen wird Anti Rückkopplungsfilter Wenn man die Lautstärke einer Mikrofon Beschallungsanlage ständig erhöht wird mit großer Wahrscheinlichkeit an einem bestimmten Punkt eine Rückkopplung auftreten Besonders Monitor Lautsprecher sind oft eine Quelle für Rückkopplungen d...

Page 9: ...mit zu einem schlechteren Gesamtklang Senkt man mit einem Equalizer die störend hervortretenden Frequenzen gezielt ab so kann der Aufnahmepegel zugunsten eines dynamischeren Gesamtklanges wieder erhöht werden 5 Fehler Checkliste Die folgende Liste enthält die am häufigsten zu erwartenden Bedienungsfehler und Fehlfunktionen und die Maßnahmen zur Abhilfe Bei Auftreten einer Fehlfunktion empfiehlt es...

Page 10: ...______________________________________________________________________________________________________________________________________________ Rauschen 95 dBm Regler in Mittelstellung EQ in 92 dBm Regler in Mittelstellung EQ in 75 dBm alle Fader am oberen Anschlag 68 dBm alle Fader am oberen Anschlag alles 22 Hz 22 kHz RMS unbew alles 22 Hz 22 kHz RMS unbew Gain Regler 10 dB to 10 dB mit 0 dB Mitt...

Page 11: ...m paying particular attention to cords at plugs convenience receptacles and the point where they exit the Component 7 Non use Periods The power cord of the Component should be unplugged from the outlet when unused for a long period of time 8 Object and Liquid Entry Care should be taken so that objects do not fall into and liquids are not spilled into the inside of the Component 9 Damage Requiring ...

Page 12: ...ltiple summing point circuitry phase irregularities between the frequency bands are reduced to a minimum All Zeck GF equalizers feature professional Constant Q filter technology where the bandwidth remains the same throughout the entire boost cut range of one fader Unlike most other equalizers which utilize the simpler variable Q filter design the GF equali zers display an extremely low ripple whe...

Page 13: ...sture No user serviceable parts inside Refer servicing to qualified personnel CAUTION WARNING CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION For continued protection against fire hazard replace only with same type and rating of fuse ATTENTION Afin de réduire le risque de feu remplacer uniquement par un fusible de même type et valeur PUSH PUSH PUSH PUSH PUSH PUSH PUSH PUSH PUSH PUSH PUSH PUSH P...

Page 14: ...160250400630 1k 1 6k2 5k 4k 6 3k10k16k 25 40 63 100160250400630 1k 1 6k2 5k4k 6 3k10k16k 12 0 dB 6 3 9 3 9 12 6 Clip 3 dB 6 dB 12 dB Signal H E A D R O O M Clip 3 dB 6 dB 12 dB Signal H E A D R O O M R Mixing desk power AP 1 800 2 x 900 W att Ster eo Power Amp Protect Limit Level ch 1 54 48 45 42 39 36 33 30 27 24 2118 15 12 9 6 3 0 51 5760 dB Protect Limit Level ch 2 54 48 45 42 39 36 33 30 27 24...

Page 15: ...ncies is 2 3 of an octave on the GF215 and 1 3 of an octave on the GF230 The following chart specifies the center frequencies their corresponding musical notes and frequency domains GF 215 GF 230 Note 25 Hz 25 Hz G2 31 Hz H2 40 Hz 40 Hz D 1 bass 50 Hz G1 63 Hz 63 Hz H1 80 Hz D 100 Hz 100 Hz G GF 215 GF 230 Note 125 Hz H 160 Hz 160 Hz d 200Hz g low mid 250 Hz 250 Hz h 315 Hz d 1 400 Hz 400 Hz g1 50...

Page 16: ...ll occur Monitor systems are especially sensitive to feedback due to their position near microphones especially when angled towards them As a rule feedback starts at one single frequen cy which can be determined by an analyzer or with the help of a musical instrument and the table on page 13 Reducing the gain of this particular frequency on the equalizer will stop the feedback and allow the overal...

Page 17: ...rbing resonant frequency can be attenuated which allows for an overall higher recording level and a much more balanced sound 5 Troubleshooting The following list contains the most common malfunctions and the steps that have to be taken if they should occur For quickest success follow the list in the given order until the desi red function is working If all measures should fail to succeed send the ...

Page 18: ...in Total Harmonic Distortion THD 0 01 20 Hz 20 kHz 0 005 20 Hz 20 kHz typically Noise 95 dBm all controls flat EQ in 92 dBm all controls flat EQ in 75 dBm all faders in maximum position 68 dBm all faders in maximum position both 22 Hz 22 kHz RMS unweighted both 22 Hz 22 kHz RMS unweighted Gain control 10 dB to 10 dB with 0 dB center detent position Channel separation 60 dB 20 Hz 20 kHz Level Indic...

Page 19: ...owner s manual GF equalizers 19 owner s manual GF equalizers 1994 Zeck Audio ...

Page 20: ...Zeck Audio Turnhallenweg 6 D 79183 Waldkirch Tel 0 76 81 20 04 0 Fax 0 76 81 20 04 43 ...

Reviews: