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HRD342 Digital Room/Speaker Delay

Quick Start Guide

ROLLS CORPORATION

SALT LAKE CITY, UTAH

12/14

Specs:

HRD342 specs

Max output: +16dB balanced, +10dB unbal.

THD+N: 1KHz 0.1%34ms, 0.5% 120Ms

Noise oor: -75dB 43Ms, -63dB 430Ms

Delay time: 32 to 360 ms +/- 20%

Overload Indication red led full on=overload

input/output connectors: Bal. XLR and RCA

Power: 15vdc 5.5mmX2.1mm DC Jack ctr neg.

Rolls PS27s 100-240vac adapter supplied with unit.

Dimensions: 6 3/4” X 1 3/4” x 3”

Weight: 1.1 lb.

Mounting: Rolls RMS270 rack tray, HR31 rack ears

FRONT PANEL DESCRIPTION REAR PANEL DESCRIPTION

CLIP LED: Indicates that the amount of signal is above a normal operat-

ing level.

LEVEL: Adjusts the amount of input signal.

DELAY TIME KNOB: Sets the delay time from 32ms to 360ms.

PWR: Indicates that the HRD342 has power.

PLEASE NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING

KNOWLEDGE OF BASIC AUDIO CONNECTION AND OPERATION

PRINCIPLES.

The HRD342 Digital Delay is used for speaker distance delay.

- RCA input and output: RCA line level.

- XLR output: Balanced line level output.

- XLR input: Balanced line level input.

- VDC: For connection to the supplied Rolls PS27s adapter.

Description

The Rolls HRD342 is intended for low cost, simple, time alignment of

speakers in larger rooms or outdoors. The delay dial is shown in milli-

seconds to make setup easy. The 32 to 360 ms shown on the dial will

correlate to roughly the same in feet (32 ms = 32 ft). The Rolls HRD342 is

inserted between the main console output and the ampliers supplying

the delayed speaker signal.

Setting the delay time

In a large space with a complicated layout, making a speaker design

for even sound is challenging. These venues require the use of delay

speakers to ensure high quality sound for all listeners. A big challenge

is where to place them, and the next design problem is that the speak-

ers are properly delayed. The sign of a job well done is when audience

members complain the speakers are not working.

One of the underlying principles of all speaker system designs is an

eect discovered in 1949 by Helmut Has, in which whatever source of

sound listeners hear rst will be the one that catches their attention.

This means that for an acoustically pleasant experience, audiences

should hear sound coming from the stage before they hear it in a delay

speaker.

To ensure this is the case, many sound designers set delay speakers as

far as 15 or 30 milliseconds behind. However, in a well-calibrated design,

just one or two milliseconds of delay time can be enough, as this design

will make the speakers invisible. A common rule of thumb is 1 foot = ap-

prox. 1 millisecond