American DJ Mix8s User Manual

U.s.audio, Whirlwind, Specifications

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

Advertising
background image

SPECIFICATIONS

hlANNEtl

CHANNE

l

2

■0

-O: O: O: -O: O: ’Q: 'O-Q:

VOLUME VOLUME pwn

99 Ling Road . Rochester, NY 14612 . Phone 716 663-8820 . Fax 716 865-8930 . Email: [email protected] . http://wwwLwhirlwindusa.com

INTRODUCTION

Thank you for selecting the U.S. Audio Mix 8S stereo line mixer. This

mixer represents an excellent value for monitoring and mixing multiple

stereo feeds, delivering the highest quality audio performance in a
compact one rack space package. The U.S Audio Mix 8 is a true stereo 8
channel line level mixer, designed for use in broadcast production, as a
studio mixdown / monitor mixer for multitrack recorders or in countless
other applications. Features include stereo channel level controls, and a

headphone monitor circuit with individual volume control. The Mix 8S

can provide up to 36 dB of gain, with a professional quality signal to noise

ratio and full frequency response. All connections are made through
balanced 1/4“ tip-ring-sleeve jacks.

UNPACKING

U.S. Audio has made every effort to ensure that your equipment is

received in the same perfect condition it was when it left the factory.

Please inspect your product for any signs of damage during shipping

and report them to your dealer so that a claim can be made to the
shipper. We recommend that you save your packing material for use in
the unlikely event that you need to return your equipment for service.

THEORY OF OPERATION

The U.S. Audio Mix 8S is a stereo line level eight channel mixer with

separate left and right signal paths. Each of the 8 inputs has left and right
balanced 1/4“ input jacks. For mono input, the right jack can be used
alone and it will ”Y” the signal to both left and right busses. The signal is
actively balanced through differential buffer amps and sent to gain
circuits. Each channel has a dual element level control with a gain range
of -60 to +18 dBm, allowing user control over a wide range of input audio
levels. Unity gain is at the 12 o'clock position for both channel volume
and the master volume.
Signals from individual channels are summed together and delivered to
both master gain stages and to the headphone driver circuit. The left and
right master outputs are controlled by a stereo volume pot which has a
gain range of -60 to +18 dBm. The 60 dBm of attenuation turns off the
audio signal at the main outputs if necessary.

The Mix 8S headphone circuit monitors the left and right busses and will

drive stereo headphones with impedances greater than 30 ohms. The

front panel stereo 1/4“ headphone jack has a volume control with a

range of -60 to +18 dB. The signal going into the headphone circuit is a
pre master fader.
Careful layout of the circuit board and a star grounding scheme ensure
no internal ground loops between channels and / or sections of circuitry.

Using low noise components, noise is 81 dB below 0 dB at unity gain,

with one channel up and 78 dB below 0 dB will all channels up at unity.
The Mix 8s utilizes a dual transformer power supply which is configured
with internal jumpers for 120 VAC 60 Hz or 230 VAC 50 Hz operation.
There is an internal fuse on the hot side of the AC cord, and the power

switch makes and breaks both the hot and neutral legs of the AC cord.

3 4 5

9 8

7

CONTROLS AND FUNCTIONS

1. INPUT LEVEL CONTROL varies the amount of signal sent to the
master left and right busses through a range of 60 dBm attenuation at full

off to +18 dBm of gain full on.

2. MASTER VOLUME CONTROL determines the amount of signal from

the summing amps that is fed to the left and right outputs. This also has a

gain range of -60 to +18 dBm.

3. HEADPHONE VOLUME CONTROL varies the signal at the

headphone jack. The signal going into the headphone circuit is pre
master fader and independent of the master volume pot.

4. POWER LED indicates that the unit is turned on.

5. HEADPHONE JACK drives stereo headphones with impedances
greater than 30 ohms and is wired with left to tip and right to ring.

6. LEFT AND RIGHT INPUT JACKS for each of the 8 channels are

balanced 1/4“ TRS. For mono input, the right jack can be used alone and
it will ”Y” the signal to both inputs.

7. LEFT AND RIGHT MAIN OUT JACKS controlled by the front master

volume pot are balanced 1/4“ TRS and will drive balanced or

unbalanced inputs.

8. POWER SWITCH connects AC to the transformer primary and the

front panel LED indicates that the unit is working. Both sides of the AC

line are switched and the main fuse is located on the circuit board inside

the unit.

9. POWER CORD has a standard 15 amp plug for 120 VAC and has no

plug on the Mix 8S 230 VAC model. Black is line, white is neutral and

green is earth.

6

BLOCK DIAGRAM

Frequency Response

Input Impedance

All Inputs

Maximum Input Level

All Inputs

Output Impedance

All Inputs

Maximum Output Level

Rise Time

Stereo Separation

Minimum Headphone Impedance

Noise

One Channel Unity Gain

All Channel Unity Gain

T.H.D. + n

Range of Gain Controls

Mute Attenuation

Total Gain

Power Consumption

AC Dropout Voltage

Size

Weight

Shipping Weight
Unit Weight

+ .5 dBm 20 Hz to 20 kHz
+3 dBm 7 Hz to 58 kHz

20 k ohm Unbalanced

+21 dBm

100 ohm

+22 dBm

6 uS

>60 dBm

30 ohms

-81 dBm
-78 dBm

<.01% 20-20kHz

-60 to +18 dBm

60 dBm

36 dBm

.15 Amps Max. A.C. At 120 VAC
.15 Amps Max. A.C. At 230 VAC

+ 105 VAC at 120 V nominal
+205 VAC at 230 V nominal

Single Space Standard E.I.A Spec

19.0“(482.6mm) Width

6.0“(152.4mm) Depth

1.75“(44.45mm) Height

7.5 lbs (3.40 kg)
6.0 lbs (2.72 kg)

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

U.S.Audio

whirlwind

TM

1

Advertising