Dorrough 280 - The Dorrough 280 and 380

Introduction 3

New Challenges

The wider dynamic range provided by this standard also poses new

challenges in monitoring. The trend to obtain a “hotter” signal typically

involves more sophisticated processing and compression. The narrowing

gap between average level and peak level means more accurate monitoring

is necessary to obtain desired results.

Another important consideration in today’s digital recording and

broadcasting include monitoring the “crash point”, or the point of reaching

the maximum input level the system or equipment can handle.

The Dorrough Digital Level Meters have been designed to meet these needs

with unprecedented accuracy, flexibility and convenience in the Dorrough

tradition.

1.3. The Dorrough 280 and 380

The Dorrough model 280 and 380 Digital Loudness Monitors (DLMs)

provide the same basic functionality as the classic 40 series analog loudness

meter except that they accept a digital data signal and display two channels.

Horizontal or Vertical Mounting

The model 280 is designed for horizontal mounting while the model 380 is

designed for vertical mounting. Both models are offered with two scale

ranges, a standard 40 dB range (-D suffix), and an expanded 60 dB range

(-E suffix). Figure 1-1 illustrates the model 280 with both scale options,

while Figure 1-2 shows the model 380 with both scales.

Figure 1-1. 280 Front Vie

-57 -54 -51 -48 -45 -42 -39 -36 -33 -30 -29 -28 -27 -26 -25 -24 -23 -22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0

MODEL 280-E U.S.A.

-39 -38 -37 -36 -35 -34 -33 -32 -31 -30 -29 -28 -27 -26 -25 -24 -23 -22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0

MODEL 280-D U.S.A.

Model 280-D

Model 280-E