UPJunior UltraCompact VariO Loudspeaker

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Product Description


UPJunior brings the sonic signature, versatile rigging, and extraordinary power-to-size ratio of the UPJ to a smaller package, combining the advantages of a self-powered system with the placement and arraying flexibility afforded by a VariO rotatable horn.


Choose either the UPJunior or UPJunior-XP with the added flexibility of external DC power and lengthy cable runs without AC conduits. The UPJuniors integrate seamlessly with UPM and UPJ loudspeakers.


Our Constant-Q horn affords uniform response throughout coverage area, while the VariO rotatable horn allows loudspeakers to be oriented horizontally or vertically, adding great flexibility to your design.

UPJunior specifications


Operating Frequency Range: 70 Hz – 20 kHz

Frequency Response:  76 Hz – 18 kHz ±4 dB

Phase Response: 250 Hz – 18 kHz ±45°

Maximum Peak SPL: 126 dB

Dynamic Range: >110 dB

Coverage: 80° x 50°


3.5 kHz


Low Frequency: One 8″ cone driver with neodymium magnet
Nominal impedance: 4 Ω Voice coil size: 1.5″

Power-handling capability: 300 W (AES)

High Frequency: One 2″ compression driver
Nominal impedance: 12 Ω Voice coil size: 2″
Diaphragm size: 2″
Exit size: 0.75″
Power-handling capability: 100 W (AES)]

Audio Input

Type: Differential, electronically balanced

Maximum Common Mode Range: ±15 V DC, clamped to earth for voltage transient protection

Connectors: Female XLR input with male XLR loop output

Input Impedance: 10 kΩ differential between pins 2 and 3

Wiring: Pin 1: Chassis/earth through 220 kΩ, 1000 pF, 15 V clamp network to
provide virtual ground lift at audio frequencies
Pin 2: Signal +
Pin 3: Signal – (optional polarity reversal switch)8
Case: Earth ground and chassis

DC Blocking: Differential DC blocking up to maximum common mode voltage\

CMRR: >50 dB, typically 80 dB (50–500 Hz)
RF Filter: Common mode: 425 kHz; Differential mode: 142 kHz

TIM Filter: <80 kHz, integral to signal processing

Nominal Input Sensitivity: 0 dBV (1 V rms, 1.4 V peak) continuous average is typically the onset of
limiting for noise and music

Input Level: Audio source must be capable of producing +20 dBV (10 V rms, 14 V
peak) into 600 Ω to produce maximum peak SPL over the operating
bandwidth of the loudspeaker


Type: Two-channel complementary MOSFET output stages (class AB/bridged)

Output Power: 300 W total

THD, IM, TIM: <.02%

Load Capacity: 4 Ω low channel, 12 Ω high channel

Cooling: Forced air cooling over amplifier heatsink

AC Power

Connectors: PowerCon with looping output

Voltage Selection: Automatic

Safety Agency Rated Operating Range: 100–240 V AC; 50/60 Hz

Turn-on and Turn-off Points: 90–264 V AC; 50/60 Hz

Idle Current: 0.448 A rms (115 V AC); 0.285 A rms (230 V AC); 0.497 A rms (100 V AC)

Maximum Long-Term Continuous Current (>10 sec): 2.55 A rms (115 V AC); 1.55 A rms (230 V AC); 2.75 A rms (100 V AC)
Burst Current (<1 sec): 2.90 A rms (115 V AC); 1.70 A rms (230 V AC); 3.20 A rms (100 V AC)

Ultimate Short-Term Current: 12.0 A peak (115 V AC); 9.0 A peak (230 V AC); 13.0 A peak (100 V AC)

Inrush Current: 15.0 A peak (115 V AC); 13.0 A peak (230 V AC); 15.0 A peak (100 V AC)

RMS Network (Optional)

Equipped with two-conductor twisted-pair network, reporting all
amplifier operating parameters to system operator’s host computer.


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