Trident 500 Series Bedienungsanleitung

DYNAMIC RESONANCE ADAPTIVE TRACKING FILTER

Hi-Lo Dynamic Filtering User Manual

Safety - This product is intended for professional use only and it is assumed

that the user is familiar with the 500 Series Modular Rack system. Always

switch o the rack power before inserting or removing this (or any other)

module or damage may occur. Do not expose this product to direct heat,

moisture or mechanical shock.

Warranty - This product is warranted free from defects in material or workmanship,

for a period of one year from date of purchase. During this period, Trident Au-

dio Developments will repair or replace this product by prior arrangement free

of charge, providing the product is determined to be defective and has been re-

turned, freight prepaid, in its original or similarly protective packaging, to a Trident

Audio Developments Service Center. Trident Audio Developments is not obligated

to provide the Purchaser with a substitute unit while repairs are carried out.

Environmental - This product complies with the RoHS directive and contains no

lead or other banned hazardous materials. In accordance with the WEEE directive,

this product must be disposed of responsibly at its end of life, by means of local

authority approved recycling systems.

For further information, or to register your purchase,

visit: www.tridentaudiodevelopments.com

Trident Audio Developments

1845 W 169th Street, Gardena, CA 90247 | tridentaudiodevelopments.com

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1Trident Audio Developments | Hi-Lo Dynamic Filtering User Manual 2Trident Audio Developments | Hi-Lo Dynamic Filtering User Manual

Trident

500 Series

Hi-Lo

Dynamic

Filtering

No Ordinary

Filtering

—————————————————————————————————————————————————

The Trident Hi-Lo, an adaptive Hi-Cut/Lo-Cut frequency ﬁltering module

that responds dynamically to program material, providing a high degree

of control and signal enhancement, unavailable in any modern day 500

series package.

—————————————————————————————————————————————————

— OVERVIEW —

The Hi-Cut

This is a sweepable low pass ﬁlter with unity

gain in the selected pass band and a select-

able (12dB per octave or 24dB per octave) roll-

o outside the pass band. Cuto frequency

can be set from 75Hz to 24kHz.

In addition, a RESONANCE control can be

switched into circuit, to introduce a resonant

peak at the selected cuto frequency. The size

of this peak, which is dependant on the elect-

ed frequency selected on the front panel, can

be varied from zero to approximately +12dB.

At maximum setting, RESONANCE stops just

short of self-oscillation.

A HI-CUT ENABLE switch allows each individ-

ual frequency band or ﬁlter to be assessed, while a red PEAK warning indi-

cator will illuminate at approximately +16dBu, approximately 12dBu below

clipping. To allow adequate headroom, avoid boosting the signal by more

than an amount which just causes this LED to ﬂash on occasional peaks.

Hi-CUT Dynamic Tracking

Using the TRACK SIGNAL function enables the Hi-Cut ﬁlter to be used

for dynamic noise reduction. This

is a technique which relies on the

psychoacoustic eect of ‘masking’,

in which a louder signal will cover

a quieter signal of the same

frequency. In this mode, the cuto

frequency

tracks dynamically the high

frequency content of the music, with

the FRE-

QUENCY control setting the frequency to which the ﬁlter will close down

in the absence of any high frequency content.

With a noisy signal applied (e.g. from analogue tape or other material

with a high background noise content), start with the FREQUENCY con-

trol at maximum (fully clockwise) and back o the control until the noise

just disappears.

3Trident Audio Developments | Hi-Lo Dynamic Filtering User Manual 4

Hi-Cut Dynamic Tracking continued

A LOW-CUT ENABLE switch allows each individual frequency band or

ﬁlter to be assessed,

while a red PEAK warning indicator will illuminate

at approximately +16dBu, approximately 12dBu below clip-ping. To allow

adequate headroom, avoid boosting the signal by more than an amount

which just causes this LED to ﬂash on occasional peaks.

Lo-Cut Dynamic Tracking

Using the TRACK SIGNAL function, enables the Lo-Cut ﬁlter to be used

for dynamic hum or rumble reduction. This is a technique which relies on

the psychoacoustic eect of ‘masking’, in which a louder signal will cover

up a quieter signal of the same frequency. In this mode, the cut-o fre-

quency tracks dynamically the low frequency content of the music, with

the FREQUENCY control setting the frequency to which the ﬁlter will

open up in the absence of any low frequency content.

With a noisy signal applied (e.g. from a record deck or other material with

a high background noise content), start with the FREQUENCY control at

minimum (fully anticlockwise) and advance the control until the hum or

rumble just disappears.

In practice, this technique demands a trade-o between noise reduction and loss

of some low frequency content of

the program material. However,

using the steepest (24dB

per

octave) slope, maximises the

amount of low frequency content

retained. In addition, discreet

use

of the RESONANCE control

introduce a small peak of a

few

dB at the cuto frequency,

can

psycho acoustically enhance

the

apparent bandwidth of the

ﬁltered signal. Use of higher

resonant settings will result

the movement of the ﬁlter

becoming audible and indeed,

combined with higher settings

of the FREQUENCY control, this

can

be the basis of some

unique eects.

Use of higher resonant set-

tings will result in the move-

ment of the ﬁlter becoming

audible and indeed, combined

with the lower settings of the

FREQUENCY control, this can

be the basis of some unique

special eects.

Further possibilities —

The sweep range of the Hi-Cut

filter is extremely wide, from

effectively subsonic, right up

to full audible bandwidth. This

suggests the possibility of fad-

ing tracks in and out, not in the amplitude domain as is usual, but in the

frequency domain.

The Lo-Cut

This is a sweepable high pass ﬁlter with unity

gain in the selected pass band and selectable

(12dB per octave or 24dB per octave) roll-o

outside of the pass band. Cuto frequency can be

set manually, anywhere from 15Hz to 16kHz.

In addition, a RESONANCE control can be

switched into the circuit, to introduce a resonant

peak at the selected cuto frequency. The

size of this peak, which is dependant on the

elected frequency selected on the front panel,

can be varied from zero to approximately +12dB.

At maximum setting, RESONANCE stops just

short of self-oscillation.

5Trident Audio Developments | Hi-Lo Dynamic Filtering User Manual 6Trident Audio Developments | Hi-Lo Dynamic Filtering User Manual

Lo-Cut Dynamic Tracking continued

Further possibilities — The sweep range of the Lo-Cut ﬁlter is extremely

wide, from eectively ultrasonic to right down to full audio bandwidth.

This suggests the possibility of fading tracks in and out, not in the ampli-

tude domain as usual, but in the frequency domain.

Hi-Lo Peak Indicators

The Trident Hi-Lo includes LED peak indicators on the outputs of both

the Hi-Cut ﬁlter section and the Lo-Cut ﬁlter section. Since the ﬁlters are

in series (the Hi-Cut circuitry before the Lo-Cut), the Hi-Cut Peak LED

monitors the Hi-Cut ﬁlter stage only, and the Lo-Cut Peak LED monitors

signal thru both stages, and as such, the output of the unit. This gives the

most ﬂexibility for clip monitoring in the unit. The Output of the Hi-Lo

can drive approximately 27.5 dB into a 600 Ohm load. The clip levels are

approximately 12 dB below actual signal Clip (so we have this occur at

+16dBu) and allows for tweaks in resonance which may exceed that but

allow for headroom after the clip indicator has just reached active.

It should also be noted, that if neither the Hi-Cut or Lo-Cut switches are

enabled, the peak LED indicators are actively monitoring the incoming

signal level.

Dynamic Linking Linked Stereo Tracking

The Trident Hi-Lo module also oers the option of linked stereo tracking

when paired with a second Trident Hi-Lo module. Ordinarily, most 500

Series racks oer paired slots by default. The Trident Hi-Lo provides an

on-board stereo link switch (S9) for use in this instance. With both mod-

ules stereo link switches selected to on, and the modules ﬁtted in the pre

paired slots, the modules are now paired together.

By enabling both Hi-Lo modules TRACK SIGNAL switches, and setting

the FREQUENCY controls to identical positions, the left and right signals

are now summed together, and the automatic tracking follows both the

left and right signal sources.

When using a 500 Series rack with selectable stereo pairing on the rear

of the rack, such as with the Trident Deca-Dent, by releasing the on-board

stereo link switches, both modules can be used as separate mono units

without the need to access the rear of the rack.

API Radial Workhorse

An on-board jumper is available for use when the Trident Hi-Lo is used in

conjunction with the API Radial Workhorse. When selected, this allows the

Hi-Lo to send its output to the Workhorse mix bus (pin 11), which is fed to

the Workhorse mixer section. This can be used in conjunction with the on-

board stereo link switch, thus enabling stereo use on the Workhorse.

— SPECIFICATIONS —

Input Impedance 10 kilohms

Max Input +27dBu

Max Output +27dbu (Into 600ohms)

Distortion (+10dBu Out) 0.0031% (20Hz to 20kHz)

(Hi Enabled Max Freq)

(Lo Enabled Min Freq)

Distortion (+20dBu Out) 0.0069% (20Hz to 20kHz)

Frequency Response 15Hz to 60kHz (-3dB)

Noise (20Hz to 20kHz bandwidth limited)

No Filters in circuit (Residual Noise) -95dBu

High Cut Enabled

Freq Max -83.5dBu

Freq Min -90dBu

Freq Max – 24dB/Oct Slope Enabled -80dBu

Freq Min – 24dB/Oct Slope Enabled -90dBu

Freq Max – Res Enabled, Resonance Min -83.5dBu

Freq Max – Res Enabled, Resonance Max -72dBu

Freq Max – 24dB, Res Enabled, Res Max -71dBu

Freq Min – Res Enabled, Resonance Min -90dBu

Freq Min – Res Enabled, Resonance Max -90dBu

Freq Min – 24dB, Res Enabled, Res Max -90dBu

Low Cut Enabled

Freq Max -83dBu

Freq Min -86dBu

Freq Max – 24dB/Oct Slope Enabled -83dBu

Freq Min – 24dB/Oct Slope Enabled -90dBu

Freq Max – Res Enabled, Resonance Min -84dBu

Freq Max – Res Enabled, Resonance Max -72dBu

Freq Max – 24dB, Res Enabled, Res Max -73dBu

Freq Min – Res Enabled, Resonance Min -86dBu

Freq Min – Res Enabled, Resonance Max -87dBu

Freq Min – 24dB, Res Enabled, Res Max -84dBu

Up to 48dB Per Octave Slope (Wired In Series)

When two Hi-Lo modules are connected in series, slopes of 12, 24, 36 and

48dB can be achieved, in any combination, by selecting the appropriate

SLOPE buttons on the front of each Hi-Lo module. For example, by en-

gaging both of the Hi-Lo modules Hi-Cut ﬁlters, and setting both mod-

ules to 24dB slope, the program material will be subject to a 48dB slope.

By adjusting one of the Hi-Cut ﬁlters to 12dB, the program material will be

subject to a 36dB slope.

The introduction of a third Hi-Lo in series with the ﬁrst two Hi-Lo mod-

ules, would provide for yet steeper slopes, again in increments of 12dB. If

fact, because they can be connected in series, you’re only limited by the

number of Hi-Lo’s that you have to hand.

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