LOFT 450 Delay Line Flanger Owner’s Manual

LOFT 450 Delay Line Flanger

DESCRIPTION

The Series 450 Delay Line/Flanger is designed for the professional recording engineer and musician. Like its predecessor the Series 440, this unit offers you flanging, doubling, chorus and Leslie effects that are second to none. The optional EM450 extender module doubles the delay time of each range giving you a full 320ms of delay for longer delay effects.

FEATURES

• SEPERATE INPUT/OUTPUT LEVEL CONTROLS
• 20 db OF GAIN FOR USE WITH MUSICAL INSTRUMENTS
• 10:1 DELAY RANGE WITH IN TIME BASE
• REGENERATION EQ SHIFT
• 3 LED HEADROOM INDICATOR
• REMOTE IN/OUT SWITCH
• FLEXABLE OSCILLATOR SWEEP CONTROLS B.T.A. INPUT
• OUTPUT WILL DRIVE +18dbm INTO 600 ohm LOADS
• INVERTED CONTROL VOLTAGES
• DELAY EXTENDABLE TO 320ms W/OPTIONAL
• EM 450 DELAY EXTENDER
• FOOT PEDAL INTERFACE FOR REMOTE DELAY
• TIME CONTROL
• 1/4″ PHONE & 3 PIN XLR CONNECTORS ON
• INPUTS /OUTPUTS

THEORY OF OPERATION

To create time-delay, an audio signal is read into a memory, stored for some period of time and then read out again. The major difference between different dealy lines is how the signal is stored. In the LOFT Model 450 the signal is stored in an Analog Shift Register. The Analog Shift Register consists of many stages, each capable of storing a discrete analog voltage.   Every time the clock waveform toggles, the voltage that was present at the input is read into the first stage. The discrete voltage sample that was resident in the first stage is shifted to the second, the second sample to the third and so on until the last stage where the sample is shifted out.

Since the clock frequency that is shifting these samples through the register is several times faster than the waveform being reproduced the output will look like a stairstep replica of the input waveform only delayed in time by however long it took to step through the shift register. Since each sample resided in each register stage for one whole clock period, the total delay is a simple function of the clock frequency and the number of register stages. (N stages/F clock frequency  Delay) The various delay effects are created by varying the clock frequency which in turn varies the delay time. This delayed signa is then mixed with the undelayed signal. Reverber- ation and resonant effects can be created by reintroducing the delayed output back at the input and delaying it over and over again.

INSTALLATION AND HOOK-UP

CHORUS EFFECT (NO PITCH CHANGE)

STANDARD CONNECTIONS

SPECIFICATIONS

MECHANICAL

ELECTRICAL
DELAY TIME (continuously variable within each range)

TOTAL HARMONIC DISTORTION + N. (delayed signal only)

OPERATING PROCEDURES

FRONT PANEL
POWER SWITCH
This switch turns unit on. LED above switch lights when unit is on.

MANUAL
Manual control varies clock frequency which in turn varies the delay of the selected time base from minimum (1) to maximum (10)

CLOCK MIX
The clock mix controls the depth of the automatic sweep. When panned full counter clockwise, the delay time is controlled completely by the manual control. When panned full clockwise, the delay time sweeps over full range. When panned to any intermediate setting, the clock will be controlled by both the manual and auto controls. As the clock mix control is panned away from auto, the depth of auto sweep is diminished.

AUTO
The automatic control varies the rate of the automatic sweep generator from slow (1) to fast (10).

EFFECT SWITCH
This switch activates FET circuitry which disengages  all effects passing input signal unmodified. LED above lights when effects are engaged.

MODE SWITCH
This switch selects between flange or delay mode. Flange mode is indicated by an amber LED. Delay mode is indicated by green LED.

PLEASE NOTE
XLR’S ARE WIRED FOR PROFESSIONAL LINE LEVER EQUIPMENT USING PIN 3 AS + IN. MICROPHONE CABLES ARE WIRED WITH PIN 2 AS THE + IN. CABLES WIRED FOR MICROPHONES CANNOT BE USED WITH THE XLR OUTPUTS OF THIS UNIT.

OPERATING PROCEDURES

FRONT PANEL – Continued

TIME BASE
The time base switches select between four different delay ranges with the bandwidth optimized for each range. The delay range is indicated above each selector. The bandwidth is indicated below each selector. The clock controls will vary the delay times within the selected range.

INPUT GAIN
The input gain control varies the input gain from 0 db to +20 db.

LED HEADROOM INDICATORS
The headroom indicators provide an instantaneous visual display of peak headroom. The indicator LED’s are callibrated to turn on at 20 db (green), 10 db (amber) and 5 db (red) of headroom before clipping. If 5 db (red) indicator lights constantly. input gain should be reduced and output control increased.

OUTPUT CONTROL
Output level control is an attenuator type volume control. Maximum output is unity gain.

SIGNAL MIX
The signal mix control is a “constant volume” pan which acts as a balance between the dry direct source and delayed signals. Full counter clockwise produces 100% dry source signal. Full clockwise rotation produces 100% delayed signal. Intermediate settings are a proportionate mix of both signals.

FRONT PANEL – Continued

REGENERATION
ation, counter clockwise provides no regeneration.

SHIFT
regenerates sigalers the frequency spectra or

REAR PANEL

AUDIO INPUT
Bals cope XL co caly a balanced input. Unbalanced – 1/4″ phone type jack accepts un- balant ou inputs ste as musical instruments,

MAIN OUTPUT
Main output is for use when direct connection to amplifiers or recorders is desired.

STEREO OUTPUT
Stereo output is for use when generating pseudo stereo or for interfacing into an effects loop.

CONTROL VOLTAGE IN
The control voltage in is used for external control of delay time. A control voltage from 1-11 volts will vary the delay time from longest to shortest. Patching into this input will disable front panel delay controls. The control voltage can be control- led with the optional FP450 foot pedal or other ex- ternal voltage sources.

CONTROL VOLTAGE OUT
The control voltage out is used to slave two or more 450 Delay Line/Flanges together. This out- put accepts a stereo 1/4″ plug. When the slave unit is driven by the tip voltage, the two 450’s will track. When the slave unit is driven by the

ring voltage, the delay function of the slave unit is inverted with respect to the master. i.e. When master unit is commanding minimal delay, slave unit delivers maximum delay. This connection is used for creating harmonizing effects.

REMOTE
Front all street te out switch effects in in in position.

FUSE
Fuse should be replaced with same value fuse as indicated on rear of unit.

AC CORD
This is a standard 3 wire grounded cord and should always be connected to the proper AC source. (115 Volts, 60 or 50 Hz)

LOFT FACTORY SERVICE
Should service be required, please follow the instructions below and return freight prepaid to:

PHOENIX AUDIO LABORATORY, INC.
Service Department
91 Elm Street
Manchester, Connecticut 06040

USE LOFT ORIGINAL CARTON
Save all packing materials. Using original carton and packing will result in safe and reliable transportation. Be sure unit does not move around in shipping. Phoenix cannot be responsible for units improperly packed. Send only the unit. IF THERE ARE ANY QUESTIONS, NOTIFY THE LOFT SERVICE DEPARTMENT FOR ASSISTNACE.

TWO YEAR LIMITED WARRANTY
LOFT PROFESSIONAL PRODUCTS (LOFT), MANUFACTURED BY PHOENIX AUDIO LABORATORY, INC. (PHOENIX), ARE WARRANTEED TO BE FREE OF DEFECTS IN MATERIAL AND WORKMANSHIP FOR A PERIOD OF TWO (2) YEARS ACCORDING TO THE FOLLOWING CONDITIONS AND EXCEPTIONS:

PURCHASE REGISTRATION

• Unit must be purchased from an authorized LOFT dealer.
• Purchase registration card must be filled out in full and mailed to:

PHOENIX AUDIO LABORATORY, INC.
91 Elm Street
Manchester, Connecticut 06040 Purchase registration card must be mailed within Fourteen (14) days of purchase.

• WARRANTY IS VOID IF UPON FACTORY EXAMINATION IT IS DETER- MINED THAT:
• Unit has been misused or abused.
• Unit’s serial number has been removed or defaced.
• Unit has been subjected to unauthorized modifications or alterations.

OBTAINING SERVICE
Ship the defective item to:

PHOENIX AUDIO LABORATORY, INC
91 Elm Street
Manchester, Connecticut 06040
Transportation charges to the factory are the responsibility of the owner. Warranty does not include cleaning and normal maintenance.

PHOENIX SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSE-QUENTIAL DAMAGES RESULTING FROM BREACH OF WARRANTY OTHER THAN REPAIR OR REPLACEMENT OF THE LOFT PRODUCT. AT THE SOLE DISCRETION OF PHOENIX.
THESE WARRANTIES ARE IN LIEU OF ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR USE: PROVIDED, HOWEVER, THAT IMPLIED WAR- RANTIES ARE NOT DISCLAIMED DURING THE TWO YEAR PERIOD FROM DATE OF PURCHASE OF THIS PRODUCT; AND, PROVIDED FURTHER, SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIEDWARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

References

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