American DJ Mix8s specifications Specifications, Introduction Theory of Operation, Unpacking

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8S

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CHANNEL1

CHANNEL 2

CHANNEL 3

CHANNEL 4

CHANNEL 5

CHANNEL 6

CHANNEL 7

8S

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VOLUME

VOLUME

VOLUME

VOLUME

VOLUME

VOLUME

VOLUME

 

 

 

 

 

 

 

 

 

 

 

 

SPECIFICATIONS

 

 

 

 

2

 

 

 

3

4

5

 

 

 

CHANNEL 8

 

 

 

 

 

 

 

 

 

Frequency Response

+ .5 dBm 20 Hz to 20 kHz

MASTER

 

PHONES

 

 

Input Impedance

+3 dBm 7 Hz to 58 kHz

4

5

6

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5

6

 

4

5

6

 

U.S.Audio

 

 

 

 

 

 

20 k ohm Unbalanced

2

 

8

2

 

 

 

 

 

8

 

All Inputs

3

 

7

3

 

7

3

 

 

7

 

 

0

 

9

1

 

9

1

0

 

9

PHONES

 

Maximum Input Level

+21 dBm

 

10

0

 

10

 

 

10

 

All Inputs

 

 

 

 

 

 

 

 

 

 

PHONES

 

 

 

VOLUME

VOLUME

 

VOLUME PWR

 

 

Output Impedance

 

 

 

 

 

 

 

 

 

 

 

 

 

100 ohm

 

 

 

 

 

 

 

 

 

 

 

 

All Inputs

99 Ling Road . Rochester, NY 14612 . Phone 716 663-8820 . Fax 716 865-8930 . Email: Sales@whirlwindusa.com . http://www.whirlwindusa.com

INTRODUCTION

THEORY OF OPERATION

 

 

R

 

 

 

 

 

 

 

 

 

 

Maximum Output Level

+22 dBm

 

 

WARNING : TO PREVENT ELECTRIC SHOCK DO NOT

 

 

 

 

 

 

 

 

LEFT

 

 

 

 

REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.

 

 

 

 

 

 

 

 

 

Rise Time

6 uS

 

POWER

U.S. AUDIO

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

8

7

6

5

4

3

2

 

1

 

CAUTION : TO REDUCE THE RISK OF FIRE AND

 

 

 

 

A DIVISION OF WHIRLWIND INC

 

 

 

 

 

ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO

 

Stereo Separation

>60 dBm

 

 

ROCHESTER, NY USA

ANY TYPE OF RAIN OR MOISTURE.

 

 

 

 

 

 

 

 

RIGHT/

 

 

L

ATTENTION : DEBRANCHER AVANT D'OUVRIR

 

 

 

 

 

 

 

 

 

 

 

120 Vac at 60 Hz

 

 

 

 

 

 

 

 

MONO

Minimum Headphone Impedance

30 ohms

 

230 Vac at 50 Hz

 

ALL CONNECTORS BALANCED

 

 

 

 

 

 

 

 

 

 

25 watts MAX

 

 

 

 

INPUTS

 

 

 

 

 

 

 

MAIN OUT STEREO TIP+, RING-, SLEEVE GND

 

 

 

 

 

 

 

 

 

Noise

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-81 dBm

9

8

7

 

6

 

 

 

 

 

 

 

 

One Channel Unity Gain

 

 

 

 

 

 

 

 

 

All Channel Unity Gain

-78 dBm

 

 

 

 

 

 

 

 

 

 

 

 

 

T.H.D. + n

<.01% 20-20kHz

 

 

 

 

 

 

 

 

 

 

 

 

 

Range of Gain Controls

-60 to +18 dBm

 

 

 

 

 

 

 

 

 

 

 

 

 

Mute Attenuation

60 dBm

CONTROLS AND FUNCTIONS

 

 

 

 

 

 

BLOCK DIAGRAM

Total Gain

36 dBm

 

 

 

 

 

 

Power Consumption

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

AC Dropout Voltage

+105 VAC at 120 V nominal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+205 VAC at 230 V nominal

 

 

 

 

 

 

BUSS

 

 

 

 

+

LEFT

Size

Single Space Standard E.I.A Spec

 

 

 

 

 

 

 

 

 

 

 

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.

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.

1. INPUT LEVEL CONTROL varies the amount of signal sent to the

 

LEFT

 

 

 

OUT

 

19.0“(482.6mm) Width

master left and right busses through a range of 60 dBm attenuation at full

 

 

 

 

 

 

 

 

 

MASTER

 

 

6.0“(152.4mm) Depth

off to +18 dBm of gain full on.

 

 

 

SUM AMPS

 

 

1.75“(44.45mm) Height

 

 

 

 

VOLUME

 

 

 

 

 

 

 

 

 

 

 

2. MASTER VOLUME CONTROL determines the amount of signal from

 

BUSS

 

 

+

RIGHT

Weight

7.5 lbs (3.40 kg)

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

 

 

 

 

Shipping Weight

 

RIGHT

 

 

 

OUT

gain range of -60 to +18 dBm.

 

 

 

 

Unit Weight

6.0 lbs (2.72 kg)

 

 

 

 

 

 

3. HEADPHONE VOLUME CONTROL varies the signal at the

 

 

 

 

 

 

 

 

headphone jack. The signal going into the headphone circuit is pre

TYPICAL OF 8

 

 

 

 

 

 

master fader and independent of the master volume pot.

 

 

 

HEAD

 

 

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

 

+

BUSS

 

HEAD

PHONES

 

 

LEFT

 

 

 

 

 

 

 

 

 

 

TOP

 

LEFT

 

PHONE

 

 

 

5. HEADPHONE JACK drives stereo headphones with impedances

 

 

 

 

VOLUME

 

 

 

 

CHANNEL

 

 

 

 

 

greater than 30 ohms and is wired with left to tip and right to ring.

 

 

 

 

 

 

 

VOLUME

 

 

 

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

 

 

 

 

 

 

RIGHT

+

 

 

 

 

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

BUSS

 

 

 

 

 

MONO

 

 

 

 

 

 

balanced 1/4“ TRS. For mono input, the right jack can be used alone and

 

RIGHT

 

 

 

 

 

BOTTOM

 

 

 

 

 

 

it will ”Y” the signal to both inputs.

 

 

 

 

 

 

 

 

 

 

 

 

 

U.S.AudioTM

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.

 

 

 

 

POWER LED

 

 

 

POWER

 

 

+18 VOLTS DC

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

 

NEG

JUMPERS

 

 

 

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

 

 

 

 

 

 

HOT

FOR

 

 

 

the unit.

 

 

 

 

 

 

120/230

 

 

 

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

 

¼ AMP

VOLTS

 

 

-18 VOLTS DC

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

 

SLOW

 

 

 

 

 

 

green is earth.

 

 

 

 

 

 

 

 

BLOW

 

 

 

 

 

 

 

 

8CHASSIS GROUNDS

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Contents Controls and Functions Block Diagram SpecificationsIntroduction Theory of Operation Unpacking

Mix8s specifications

The American DJ Mix8 is a versatile audio mixer designed for DJs, musicians, and audio professionals who require reliability and functionality in live sound environments. Known for its user-friendly interface, the Mix8 delivers exceptional performance tailored to meet the demands of both seasoned experts and novice users alike.

One of the standout features of the Mix8 is its robust eight-channel setup. This allows for the seamless integration of multiple audio sources, such as microphones, musical instruments, and media players. Each of the eight channels is equipped with a dedicated gain control, which provides users with precise control over the input levels. Additionally, the Mix8 includes a 3-band EQ for each channel, allowing for tailored sound shaping. This makes it easy to adjust highs, mids, and lows to fit the sonic requirements of any event or performance.

In terms of technology, the Mix8 offers advanced connectivity options, ensuring compatibility with a variety of audio equipment. It features XLR balanced outputs, RCA outputs, and even a headphone output with a dedicated volume control, which is essential for cueing and monitoring audio tracks. Furthermore, the mixer includes built-in effects such as reverb, delay, and flanger, enhancing the creative possibilities for live performances.

The Mix8 also boasts a rugged build quality, designed to withstand the rigors of frequent transport and use. Its compact and lightweight design makes it an ideal choice for mobile DJs and performers who need a mixing solution that offers portability without sacrificing performance. The mixer’s layout is intuitive, with clear labeling and an organized control panel, allowing users to make adjustments quickly and efficiently during live sets.

In summary, the American DJ Mix8 combines a solid feature set with advanced technology to provide an exceptional audio mixing experience. With its eight channels, onboard effects, and durable design, the Mix8 is an excellent choice for anyone in need of a reliable mixer that can handle a diverse range of audio applications. Whether in a club, at an event, or in a studio, the Mix8 is sure to deliver high-quality sound and exceptional performance. With its well-thought-out design and features, the Mix8 continues to be a favorite among audio professionals and DJs alike.
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