Ashdown 12 Band Graphic DI Manuel d'utilisateur télécharger pdf

Shape Footswitch

This activates the Shape EQ facility, indicated by the illumination of the left hand blue

LED.

Graphic Footswitch

This activates the Graphic EQ facility, indicated by the illumination of the right hand

blue LED.

Battery Compartment

This contains the single 9v battery that powers the effects pedal. Replace this when the

VU meter illumination starts to become dull.

The GRAPHIC EQUALISER section operates by boosting or cutting the level of signal at

various frequency points throughout the frequency range. With the sliders set on 0dB (in

their centre ‘click’ position) no alteration is made to the signal. Moving any one of the

sliders up will increase or ‘boost’ the signal at the frequency marked below the slider.

Moving the slider down, will decrease or ‘attenuate’ the signal at that frequency.

A carefully designed GRAPHIC EQUALISER is a very ﬂexible way of varying the sound

of a bass guitar and if properly used will provide an extremely powerful method of tone

shaping for your instrument.

Because of the ﬂexibility and massive BOOST and CUT potential of this particular

GRAPHIC it is important to know how to get the best from it.

Firstly a few things not to do and the reasons why:

Do not boost or cut all frequency bands as this will have the same effect as increasing

or decreasing the overall volume level without affecting the tonal characteristic of the

sound.

Do not use excessive bottom (30 to 40Hz) boost on the graphic unless your speakers

can handle it. Very few speaker systems are capable of handling frequencies as low as

30 and 40Hz with any degree of efﬁciency.

N.B. Boosting at 30Hz for instance will not add to the perceived amount of bottom end

in the sound, it will only make your speakers ﬂap to no useful effect. In fact boosting

at 100Hz or 180Hz will have the apparent effect of adding far more bottom end than

boosting at 30, 40 or even 60Hz.

Do not use excessive top (10 to 15kHz) boost, this will add mostly hiss to the sound as

there is very little signal output at this frequency from a bass.

The 30Hz slider has been provided to allow precise tailoring at very low frequencies.

This slider should be used to CUT (not Boost) the 30Hz to a level that allows the speaker

system to work at its maximum efﬁciency.

USEFUL OBSERVATIONS

The fundamental frequency range of a regular, four string bass guitar is from 41.2Hz (

bottom E string ) to around 392Hz ( two octaves up on the G string ) – not a very wide

range. Obviously a lot of harmonics are produced when playing and these can extend

up to 5kHz and more.

The attack portion of the note also produces other high frequencies when the string is

ﬁrst struck. This attack can be emphasised by boosting the top end. However because of

the fairly small range of frequencies from a bass, by top end we mean between 2.6kHz

and 5kHz. You will ﬁnd that by boosting at 5kHz the attack will be emphasised whereas

by boosting at 1.3 and 2.6kHz you will bring out the harmonics in the note.

Above this frequency range you will ﬁnd it is better not to boost the signal as this will

mainly emphasise any hiss present. This hiss will not be masked by the bass signal when

playing due to the very small amount of bass guitar frequency content at 10 to 15kHz.

Use the 30Hz and 40Hz sliders sparingly unless you have a massive stack of speakers

available, and the power ampliﬁers to drive them. You will ﬁnd that rolling off the

bottom end by using these two sliders will allow you to play at a far greater volume level

without the speakers complaining.

Try to keep the graphic sliders balanced around 0dB and in a smooth ﬂowing curve

from one slider to the next, and remember that after adjusting the graphic you may need

to re-set the INPUT GAIN.

TEchNIcAL SpEcIFIcATIONS

Graphic Equalisation section

Graphic Equalisation

+/- 15dB @ 12 centre Frequencies

Shape section

+8db @ 50Hz & 4khz, -8db @ 400hz,

Filter slope 6db per octave

Input

Impedance 470k Ohms

Signal level –10dBv to 0dBv

Output

Jack socket

Impedance 1k Ohms

Signal level - same as input level

D.I. XLR socket

Balanced 600 Ohms

Signal level – adjustable -20 to -10dBv

Supply

Internal 9v battery

External supply 9v Stabilised DC adaptor. Centre pin negative.

The Bass Graphic EQ/D.I. Effects pedal is a 12 band graphic equalisation pedal

designed speciﬁcally for BASS use that includes a Pre-Shape facility as well as a D.I. XLR

output for direct injecting your bass signal into a balanced input on a PA mixing desk.

This provides the ultimate in tone shaping for a bass instrument with 12 bands of plus

and minus 15dB of control at your ﬁngertips plus independent level controls for Graphic

and Shape enabling the perfect balance to be achieved when switching in either facility.

Add a D.I. Level control and there you have the perfect device for any bass player on

the move.

REAR pANEL

Input Jack Socket

The single Input jack socket is suitable for either passive or active bass guitars. Inserting

a jack socket into this will activate the power to the unit, indicated by the illuminated VU

meter.

Output D.I. Socket

Balanced XLR output socket for sending the signal to PA systems etc.

DC Connector

This is for the use of an external 9v, stabilised power adaptor in place of the internal 9v

battery. Inserting a DC connector into this socket disconnects the internal battery.

Output Jack Socket

With both Shape and Graphic in bypass mode this jack socket provides a feed of

exactly the same level of unmodiﬁed bass signal that is fed into the Input socket. With

either the Shape or Graphic switched in circuit (as indicated by the illumination of either

LED) the signal fed to this is set using the Shape and Graphic Level controls.

FRONT pANEL

Input control & VU Meter

The Input control is used to set the level of signal into the Effects section of the unit.

Adjust the Input level control to get a good indication of at least 0 VU on the VU meter

whilst playing your instrument. This control is necessary to cope with the widely varying

level of signals from Passive and Active bass instruments.

Shape

This adjusts the amount of Pre-Shaped signal sent to the output when this equalisation

facility is switched in using the Shape footswitch. Activation is indicated by the left hand

blue LED. This Shape facility imposes a pre-set equalisation curve onto the bass signal

that boosts both the high and low frequencies and also adds attenuation to the lower

mid frequencies. This can be used by itself or in conjunction with the Graphic facility.

Graphic Level

This adjusts the amount of Graphic EQ’d signal sent to the output when this equalisation

facility is switched in using the Graphic footswitch. Activation is indicated by the right

hand blue LED. The Graphic facility imposes an equalisation curve onto the bass signal

that is adjusted using the 12 sliders within the graphic control section. This can be used

by itself or in conjunction with the Shape facility. For more details see – The GRAPHIC

EQUALISER section below.

D.I. Level

This adjusts the level of signal that is sent to the D.I. XLR output socket on the rear panel.

This signal is post EQ meaning that whatever equalisation you switch in with the Shape

and Graphic footswitches will also be sent to the D.I. socket.

The output signal from this XLR socket is set to a level and impedance suitable for

connecting directly into the Microphone input of a mixing desk for either Direct

Injection into the PA system or for recording. This must ONLY be used into a Balanced

Microphone input; it is not intended for any other type of connection.

Bass Graphic/D.i. peDal

OperaTiNG iNsTrUcTiONs

Fig. 1. Rear Pannel.

Bass Graphic/D.i. peDal 1

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Page 1 - Bass Graphic/D.i. peDal

Shape FootswitchThis activates the Shape EQ facility, indicated by the illumination of the left hand blue LED.Graphic FootswitchThis activates the Gra

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Ashdown 12 Band Graphic DI Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Accessoires pour la musique Ashdown 12 Band Graphic DI. Ashdown 12 Band Graphic DI User Manual Manuel d'utilisatio

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