Trident Hi-Lo 500 Series Bedienungsanleitung

DYNAMIC RESONANCE ADAPTIVE TRACKING FILTER

Hi-Lo Dynamic Filtering User Manual

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

Trident

500 Series

Hi-Lo

Dynamic

Filtering

No Ordinary

Filtering

Trident Audio

Developments have

brought to life the

adaptive ﬁltering circuitry

that made the original

a classic, in a modern

500 series format.

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

Branded the Hi-Lo, the Trident 500 series Hi-Lo is an adaptive Hi-Cut /

Lo-Cut frequency ﬁltering module which can respond dynamically to the

program material, providing the user with a high degree of control and

signal enhancement, unavailable in any modern day 500 series package.

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

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

— 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. Cut o fre-

quency 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 cut-o 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 individual frequency band or ﬁlter

to be assessed, whilst a red PEAK warning indicator will illuminate at ap-

proximately +16dBu, approximately 12dBu below clipping. To allow ad-

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

which just causes this LED to ﬂash on occasional peaks.

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

Hi-Cut Dynamic Tracking continued

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

eectively 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. Cut o frequency can be

set manually, anywhere from 15Hz to 16kHz.

In addition, a RESONANCE control can be switched

into circuit, to introduce a resonant peak at the

selected cut-o 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.

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

ﬁlter to be assessed,

whilst 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

min-imum (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 cut-o frequency,

can

psycho acoustically enhance

the

apparent bandwidth of the

ﬁl-

tered 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.

Trident Audio Developments | Hi-Lo Dynamic Filtering User Manual

5Trident 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 sug-gests 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.

Dynamic Linking Linked Stereo Tracking

Two Trident Hi-Lo modules can be employed for linked stereo tracking, when

used via an external stereo linking system, such as on the Trident Deca Dent.

This is achieved by enabling both Hi-Lo modules TRACK SIGNAL switches

and setting the FREQUENCY controls to identical positions. The track signal

is generated by the sum of the left and right signals, and the automatic tracking

follows both the left and right signal sources.

48dB Per Octave Slope (Stereo Paired Hi-Los)

Up to 48dB per octave slope can be achieved on the Trident Hi-Lo when

stereo paired with a second Hi-Lo module. In fact, because the Hi & Lo

ﬁlters are in series, this can be set anywhere between 12 and 48dB by se-

lection of the two SLOPE buttons on the front of the Hi-Lo. For example,

by engaging both Hi-Lo units, Hi-Cut ﬁlters and setting them to 24dB

slope, the program material will be subject to a 48db per octave slope.

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

will be subject to 36db per octave slope. The same can be said for the

Lo-Cut ﬁlter.

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

— 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

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.

Governing Laws

If the purchaser acquired a Trident Hi-Lo Dynamic Filtering originating from the

Trident Audio USA oce direct, or through any Authorized US or European Autho-

rized Dealer, then any order or contract to which these terms and conditions apply

and all matters arising there under shall be construed according to and governed

by the Laws of The State of California, United States.

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

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