LD410
professional interface
INTRODUCTION
UNPACKING
The Whirlwind LD410 Line Driver is the ultimate tool for matching
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 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.
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 (RCAinput 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
230VACbychanginginternaljumpers.
FEATURES
The LD410 is a one rack space, eight channel, high performance line driver featuring:
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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
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LD410 BLOCK DIAGRAM
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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.
1. InputPad switchappliesa14dBpadacrosstheinputjackwhendepressed.
2. Gain control varies the signal level at the output jacks. The gain markings around the knob
indicate the amount of gain or attenuation being applied to the signal. The bold mark
designates the normal position for +4dB to -10dB conversion on channels 1, 2, 5 and 6 and
-10dB to +4dB conversion on channels 3, 4, 7 and 8. The "0" gain position is unity gain,
balanced input to balanced output.
8. RCA input jacks on inputs 3, 4, 7 and 8 take unbalanced input signals to the respective
channel's preamp section. These jacks are ground floated unbalanced inputs, which parallel
the available balanced inputs (see 10) and can be grounded by connecting a jumper from "G"
to"-"onthescrewterminals.
3. Output Mute switch turns off the output signal when activated. It also illuminates the clip
LEDinasteadystatetoindicatethatthechannelismuted.
9. Male XLR output jacks on outputs 3, 4, 7 and 8 deliver balanced line level signals from the line
driversandarecontrolledbytheoutputgaincontrols.
4. LED Indicators show the level of the signal at the output jacks. Green is set to light when
the output signal is at -10dB and yellow illuminates at +4dB. The red clip LED monitors
the signal level both before and after the output gain control. If the clip LED illuminates,
the output gain can be reduced to determine if the clipping is the result of a high input level
ortheamountofoutputgain. (See“DescriptionofBlockDiagram”fordetails.)
10. Screw terminal connections provide balanced signal connections for the channels with RCA
jacks. The RCAjacks on inputs 3, 4, 7 and 8 are connected in parallel across the plus and minus
terminals and can be grounded by connecting a jumper from "G" to "-" on the screw terminals.
The screw terminals on outputs 1, 2, 5 and 6 have separate drivers and can be used
simultaneouslywiththeRCAoutputs.
5. Power switch applies power to the unit and the Power LED indicates that the unit is
turned on. There is an internal fuse, which if blown, prevents the power LED from
lighting.
11. Groundliftswitch- whendepressed, disconnectsaudiocommonfromearthground.
12. Internal signal routing jumpers (not shown) allow flexible signal routing from input preamps
to the line driver outputs. Each output is configured at the factory to deliver the signal from the
corresponding input. Changing the jumpers sets up distribution amps, allowing multiple
outputstodeliverthesameinputsignal. (See“DescriptionofBlockDiagram”.)
6. Female XLR input jacks on inputs 1, 2, 5, and 6 take balanced line level inputs to the
respective channel's preamp section. The output of each preamp can be assigned (via
internal jumpers) to other output channels in addition to the normal output.
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SPECIFICATIONS
-.6 dBv 20-20K Hz.
-.1 dBv 50-10 K Hz
Frequency Response
<.004 % 20-20 K Hz. @ Unity gain
+38 dBv
Total Harmonic Distortion +noise
Total Gain
Range of level pot
Common Mode Rejection of Input
Maximum Input level
Input Impedance
Maximum output level
Output Impedance
Noise at unity gain
Noise at 14 dBv of gain
Working signal to noise ratio (at 20
dBv headroom)
-38 to + 38 dBv
< -72 dBv 20-20 K Hz.
+22 dBv
40 K ohm balanced
+22 dBv
200 ohms balanced
-85 dBv
-80 dBv
> 85 dBv
> 85 dBv
Isolation between channels
Clip LED threshold
Power consumption
Power requirements
Size
+20 dBv
20 Watts Maximum
120 VAC 60 Hz or 230 VAC 50 Hz, factory set
1 Rack unit (19X1.75X6.25”)
6.5 Pounds
Unit Weight
.2 Amp Slow blow type 3AG
8 Pounds
Internal Mains fuse
Shipping Weight
Stereo Separation
>90 dBv 20-20K Hz.
99 Ling Road - Rochester, NY 14612
800-733-9473 - 585-663-8820 - Fax: 585-865-8930
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