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INTRODUCTION

The Whirlwind LD410 Line Driver is the ultimate tool for matching 

audio equipment signal levels. The LD410 is both a professional quality, 
sonically superior -10 to +4dB to -10dB level converter and a flexible 
multichannel distribution amplifier within a single rack space enclosure. Each 
of the eight output channels feature gain controls, LED metering and mute 
buttons. There are also eight input channels utilizing the highest quality, low 
noise preamplifiers with14dB input pads that can be engaged to attenuate high 
input signals. The LD410 is factory configured with four channels of 10dB to 
+4dB conversion (RCA input jacks to male XLR outputs) and four channels of 
+4dB to 10dB level conversion (female XLR inputs to RCA output jacks). An 
additional screw terminal block on the rear panel provides balanced signal 
connections for those channels with RCA jacks. Assignable signal routing 
jumpers inside the LD410 permit the creation of multiple distribution 
amplifiers by allowing multiple outputs to receive their signals from a common 
input. The LD410 has an internal power supply, which can be set for 115VAC or 
230VAC by changing internal jumpers.

US Audio has made every effort to ensure that your equipment 

is received in the same perfect condition it was in when it left the 
factory. Please inspect your product for signs of any damage during 
shipping and report them to your dealer so that he can present a claim to 
the shipper. We recommend that you save your packaging material for 
use in the unlikely event that you need to return your equipment for 
service.

UNPACKING

LD410

The LD410 is a one rack space, eight channel, high performance line driver featuring:

·     

Four channels of +4dB to -10dB level conversion, female XLR to RCA phono.

·     

Four channels of -10dB to +4dB level conversion, RCA phono to male XLR.

·     

All eight outputs have -38dB to +38dB variable gain controls.

·     

Multiple outputs can be assigned to a common input.

·     

LED metering for -10dB, +4dB, output and input clip indication.

·     

Mute switches on each output.

·     

Switchable 14dB pads on each input.

·

     Screw terminal block allows balanced signal connections to all channels

FEATURES

professional interface

Summary of Contents for LD410

Page 1: ...ers by allowing multiple outputs to receive their signals from a common input The LD410 has an internal power supply which can be set for 115VAC or 230VACbychanginginternaljumpers USAudio has made every effort to ensure that your equipment is received in the same perfect condition it was in when it left the factory Please inspect your product for signs of any damage during shipping and report them...

Page 2: ...ty allows the configurationofmanydifferentsignaldistributionschemes DESCRIPTION OF BLOCK DIAGRAM The standard factory configuration is that of a dual stereo 10dB to 4dB and 4dB to 10dB level converter Channels 1 2 5 and 6 convert 4dB balanced signals to 10dB unbalanced Channels 3 4 7 and 8 convert 10dB unbalanced signalsinto 4dBbalancedones From the routing jumpers the signal is applied to the gai...

Page 3: ...LD410 BLOCK DIAGRAM ...

Page 4: ...via internal jumpers to other output channels in addition to the normal output 7 RCA output jacks on outputs 1 2 5 and 6 deliver unbalanced signals from the line drivers and are controlled by the output gain pots The RCA outputs may be used simultaneously with the balancedoutputs see10 becausetheyhaveseparatedrivercircuits 8 RCA input jacks on inputs 3 4 7 and 8 take unbalanced input signals to th...

Page 5: ... K Hz Maximum Input level 22 dBv Input Impedance 40 K ohm balanced Maximum output level 22 dBv Output Impedance 200 ohms balanced Noise at unity gain 85 dBv Noise at 14 dBv of gain 80 dBv Working signal to noise ratio at 20 dBv headroom 85 dBv Isolation between channels 85 dBv Clip LED threshold 20 dBv Power consumption 20 Watts Maximum Power requirements 120 VAC 60 Hz or 230 VAC 50 Hz factory set...

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