USB 7004 - DJ Equipment US Blaster - Free user manual and instructions

Product type	DJ mixing console
Brand	US Blaster
Model	USB 7004
Category	DJ equipment
Channels	3 channels (A, B, C) with faders + 1 microphone channel
Inputs per channel	2 inputs (phono/line) with button switching
Microphone input	1 input with gain adjustment, -54 dB / 600 ohms
Main outputs	Balanced Master XLR (0 dB and +6 dB), subwoofer (125 Hz), monitor, 2 headphone pairs
Equalization	3 bands (High, Mid, Bass) with cut switches (Killer) per channel
Crossfader	Assigned to channels A and C, with Transform function for cut effects
Pre-listening (Cue)	On each channel, with separate or mixed listening (Split)
Faders	Long ALPS, dust-resistant mounting
Power supply	220-240 V, 50 Hz, 25 W
Protection	Relay on master output against failures
Technical specifications	Channel separation > 65 dB @ 1 kHz, input noise > 80 dB
Phono input	Level -41 dB @ 47 kΩ, impedance 47 kΩ / 25 pF
Line input	Level -14 dB @ 600 Ω, impedance 22 kΩ
Headphone output	0.3 W into 4 Ω, impedance 4..32 Ω
Special functions	Killer (instant frequency cut), Transform (blending music fragments)
Indicator lights	LED meter (master/cue level), line/phono LED, active Cue LED
Maintenance and cleaning	Faders protected against dust; clean with a soft, dry cloth.
Safety	Protection relay on master output; respect the supply voltage.
General information	Device intended for indoor use; operating ambient temperature 5°C to 35°C.

Frequently Asked Questions - USB 7004 US Blaster

How to connect turntables to the USB 7004?

Use the phono inputs of each channel. Adjust the Gain to set the input level. If your turntables have a line output, switch the selector to Line.

How to use the Cue function?

Press the Cue button of the desired channel (the LED lights up). The signal will be audible in the headphones. Use the Split button to listen to Cue on the right and Master on the left.

What does the Transform button do?

The Transform button allows adding or cutting the signal of a channel while using the crossfader. For example, if the crossfader is to the left (channel A only), pressing the right Transform adds channel C.

How to adjust the equalization?

Each channel has three faders: High (treble), Mid (midrange), and Bass (bass). Turn them to increase or decrease the corresponding frequency. The Killer switches immediately cut the selected band.

Can I connect a microphone?

Yes, connect the mic to the dedicated input and use the Gain to adjust the volume. You can also adjust the EQ (High, Bass) and the stereo position with Pan.

How to connect headphones?

Plug your headphones into one of the two front Phones jacks. Adjust the volume with the Cue knob (headphone volume) and the Monitor for the monitor output.

What do the Line/Phono LEDs mean?

These LEDs indicate which input is active on the channel: Line for a line source (CD, computer) or Phono for a turntable with built-in phono preamp.

How to use the subwoofer output?

The Subwoofer output delivers a signal filtered at 125 Hz. Connect it to a powered subwoofer. The level is controlled by the Master fader.

What if no sound comes out of the master?

Check that the Master fader is open, the channels are not muted (Cue turned off) and the crossfader is not stuck on an empty channel. Also ensure the output cables are properly connected.

How to clean the USB 7004?

Use a soft, dry cloth to dust the surface. Avoid chemicals. The faders are dust-proof, but regular maintenance extends their lifespan.

USER MANUAL USB 7004 US Blaster

Our USB 7004 has 3 channels (A, B and C) of which each includes a fader and 1 channel without any fader. This last channel enables a microphone to be used; the microphone volume level can be set using the gain control. You will surely appreciate the long, flexibly operating (100 mm) ALPS faders, which are mounted so that any dirt is prevented from entering them and, therefore, a long-term trouble-free operation is ensured. The 3 channels have 2 inputs to connect, besides turntables, line signals. Due to the button situated next the channel input control, switching from Input 1 to Input 2 is easy because switching the plugs is eliminated.

Extra attention is paid to tone adjustment: perfect trebles including their boosting, middle tone presence and beautiful basses. In addition, 3 killers enable bass, middle tone and/or treble to be removed from X-fader within a second. The X- fader operates on 2 external faders and Transform switches add music fragments from one channel to those from the other.

Pre-listening operates on both channels and uses an outstanding amplifier, which is equipped with a switch to reproduce pre-listening and master signal at the same time.

The balanced master output is fitted with chassis XLR connectors and the built-in relay prevents undesirable cracking noise (plops) from occurring so that your sound system is protected in an optimum manner.

In addition to the master output, the USB 7004 includes a Sub output, Monitor output and 2^nd Phones output.

Specifications

Channel separation > 65 dB at 1 kHz

Output noise >80 dB

Phono input

Signal level -41 dB at 47 kOhm (variable)

Impedance 47 kOhm/25 pf nom.

Line input

Signal level -14 db at 600 Ohm variable

Impedance 22 kOhm nominal

Microphone input -54 dB / 600 ohm

Output

Master XLR +6 dB balanced / 600 ohm /variable

Master XLR 0 dB balanced / 600 ohm /var.

Master XLR 0 dB balanced / 600 ohm /var.

Subwoofer 0 dB unbalanced / 600 Ohm /125 Hz

Headset 0.3 Watt at 4 Ohm / imp. 4..32 ohm

Power Supply

220-240 Volt 50 Hz - 25 Watt

Operating instructions

Input section:

LED meter	To indicate the cue or master level. You can maintain a working level of about 0 dB.
Masterfader	Volume control for the Sub and Stereo outputs.
Cue LED	If Cue is not active, the LED will light up. Then, the master signal will be led through the Phones output.
Monitor	To adjust the volume of the stereo monitor output.
Cue	Headset volume control.
Split	To set a function of the headset if Cue is active on a channel. After the Split button is pressed down, Cue signal will be present on the right side of the headset and the Master signal on the left side.
Phones	Headset stereo connection.

Crossfader and Transform Functions

The Crossfader is used to set a volume level of the A and C channels. If the Crossfader is in the left position, the A channel will only be audible. If the Crossfader is in the right position, the C channel will only be audible. If the Crossfader is in the left position and the right Transform button is pressed down, the signal of the C channel will be mixed in. If the Transform is pressed down in that situation, the A channel will be suppressed. The above mentioned procedure also applies to the Crossfader in the right position.

Killer Function

Using these switches, you can very quickly remove basses, middle tones and/or trebles.

DJ Channel

Gain Microphone level control.

High Treble control.

Bass Bass control.

Pan To set the microphone to any required position between the left and the right channels.

A, B and C Channels

This section includes 2 inputs, 3-way tone control, volume level control and pre-listening. The A and C channels are outputted on the left or the right side of the Crossfader respectively.

The B channel is outputted directly to the master output.

Line /phono LEDs indicate the input you have selected.

Gain To pre-set a volume level of the line and phone inputs.

High Treble control.

Mid Middle tone control.

Bass Bass control.

Ball To set balance between the left and the right channels.

Cue To switch on/off pre-listening. If the function is active, headset will be switched on and led to Cue and 1 output or more outputs will be audible even if the Fader is in the closed position! If the LED is on, the Cue function is active.

Master XLR +6 dB equilibrato/600 ohm/variable

Master XLR 0 dB equilibrato/600 ohm/variable

Master XLR 0 dB equilibrato/600 ohm/variable

Subwoofer 0 dB non eaulibrato 600 ohm / 125 Hz

Headset 0,3 Watt @ 4 ohm/imp. 4..32 ohm