QSC GX3 专业功率放大器
技术参数：
GX 系列功率放大器是那些要求将最专业的品质性能和最佳经济性二者合一的理想选择。在Pat Quilter先生领导下的QSC的设计团队基于QSC最新技术设计出的GX系列功放有着重量轻、音质好、可靠性高、操作简单、外观时尚、性价比高等特点。
GX 系列功放可以为娱乐演出使用的大多数最流行的扬声器提供所需的合适功率。大多数的扬声器生产商都推荐一款可以提供额定功率或者两倍连续功率的功放来匹配自己的扬声器。
GX3 每声道输出节目功率为300W，GX5每声道输出节目功率可达500W。这两种型号都支持4 Ω和8 Ω负载。GX5功放4Ω输出为700W，是时下流行的4 Ω的扬声器（双低音、两分频模式和超低频）的最佳匹配功放。
技术注解
GX3使用最新的QSC接地输出技术，先进的冷却系统可以适用于功率放大器的极端输出要求 ，真正的B型偏压放大系统具有功率与音频的完美平衡。
次低频扬声器/卫星扬声器分频器
如何使全频音箱播放更大的声压级或者采用功率较小的扬声器达到同样的声压级效果？可以使用QSC GX系列功率放大器。GX系列功率放大器支持分频模式：将全频带信号输入至通路1，输出20Hz-100Hz的低频信号送入次低音扬声器（Ch1）和100Hz-20KHz的高频信号送入高音单元（Ch2）。当通过GuardRail技术得到最佳的峰值能量各自独立的进入次低音单元和高音单元时，可以使用前面板上的增益控制旋钮平衡地控制低音单元和高音单元的增益，从而得到更好的音乐效果和动态范围。
特点：
功率输出满足现今大部分演出系统扬声器
优化输出，使4欧姆或者8欧姆扬声器系统有一个最大限度的功率余量
输入：XLR插头,1/4"TRS平衡插座和接线柱，几乎兼容所有的声源设备
输出：Speakon输出接口，1/4"非平衡插头或者speakon 2极或4极插头（仅仅连接两极）。 接线柱适合所有的扬声器线路系统
深度最小的机壳（10.1英寸/257毫米）可安装在紧凑的空间里，节省机柜空间，降低成本
重量轻－低于26磅（12.5kg）
平缓的增益控制更易于精确调整和输入灵敏度的匹配
GuardRail技术能够避免满负荷工作造成的功放和扬声器的过载、过热损坏
前面板上有对进行监控信号大小和削波的信号LED灯
内置超低频和卫星扬声器系统分频器
GX 系列专业功率放大器
型号
GX3 适用于阻抗8欧扬声器：250-350W（节目功率）*
·适用于阻抗4欧扬声器：350-500W（节目功率）
Power Amplifier (300 Watts)
Optimized for maximum real-world headroom into 4 Ω and 8 Ω speaker systems.
GX Series amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget. QSC designers, headed by Pat Quilter, have optimized output and appearance while reducing raw material cost and weight. It's all here – dramatic styling, easy hookup and adjustments, excellent audio quality and QSC reliability.
GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Most loudspeaker manufacturers recommend an amplifier with power output equal to the speaker's "Program (Music) Power" rating or two times (2 x) the "Continuous (RMS) Power" rating.
The GX3 is ideal for speakers in the 300 watt (Program) range. This model supplies the maximum possible power to 4 Ω and 8 Ω loads. Owners of popular 4 Ω loudspeakers (dual-woofer, two-way models and many subwoofers) will find the 700 watt (4 Ω) power of the GX5 an ideal match.
Features
Power levels matched to the most popular speakers used by entertainers
Optimized for maximum real-world headroom into 4 Ω and 8 Ω speaker systems
Inputs: XLR, 1/4-inch TRS and phono input connectors for compatibility with any source
Outputs: Speakon combo accepts, 1/4-inch (TS) plugs or Speakon 2-pole and 4-pole plugs (connects 2 poles only).
Binding posts support all other speaker wiring systems.
Minimum depth chassis (10.1 inches/257 mm)
Fits in compact, inexpensive effects racks Lightweight – less than 26 lbs (12.5 kg)
Detented gain controls for precise setting and matching of sensitivity
GuardRail automatically protects the amplifier and loudspeakers from damage due to temperature rise or overdrive without shutting down the show
Front panel LEDs monitor Power, Signal and Clipping
Subwoofer/Satellite crossover built-inGX Entertainer
GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Most loudspeaker manufacturers recommend an amplifier with power output equal to the speaker’s Program (Music) Power rating or two times (2 x) the Continuous (RMS) Power rating. The GX3 is ideal for speakers in the 300 watt (Program) range. The GX3 supplies maximum possible power to 4 Ω and 8 Ω loads.
Technical Notes
The GX3 uses the latest evolution of the QSC Grounded Collector output system, for optimum cooling of the critical power transistors. A true Class B biasing system combines maximum thermal efficiency with excellent audio performance. QSC design expertise allows the output devices to shift from low-power to high-power rails in less than a millionth of a second, ensuring that the output power is always right where it needs to be without excess loss.
The amplifier uses premium toroidal power transformers for reliable mid-weight performance. A variable-speed fan moves air crosswise through the amplifier, drawing cool air in over the power transformer, through the fan, and then over the heat sink. This keeps the transformer cool and allows a full size heat sink to fit in a down-sized chassis. As always, the amplifiers are fully protected from the usual hazards of the trade, ensuring stable performance and long life.
GuardRail protection delivers full peak power while preventing detrimental overloads. During excessive clipping, or extreme overheating, GuardRail reduces gain just enough to preserve the integrity of the music, protect the speakers and keep the audience excited, without unprofessional distortion levels or shutdowns.
Subwoofer/Satellite Crossover
A subwoofer reduces strain on the full-range speaker, allowing it to play louder, or letting a smaller speaker do the same job. The GX Series supports this mode with a Crossover switch that splits the full-range input entering Ch 1, sending 20 Hz -100 Hz to the sub (Ch 1) and 100 Hz - 20 kHz to the top box (Ch 2). The front panel gain controls balance the sub and top box, while GuardRail optimizes peak power into the sub and top individually, for greater musical impact and dynamic range.
Technical Info
Specifications
Stereo Mode:
- 8 Ω / both channels driven: 300 Watts
- 8 Ω / single channel driven: 350 Watts
- 4 Ω / both channels driven: 425 Watts
- 4 Ω / single channel driven: 500 Watts
- 2 Ω / both channels driven: 200 Watts
Distortion:
- 8 Ω: less than 0.05%
- 4 Ω: less than 0.1%
Signal to Noise (20 Hz - 20 kHz): 100 dB
Input Sensitivity: 1.2 Vrms
Voltage Gain (8 Ω): 32.2 dB
Output Circuitry: Class B
Power Requirements: 6.3A
Frequency Response: 20 Hz - 20 kHz, +0, 1 dB
Dynamic Headroom (4 Ω): 2 dB
Damping Factor: 100
Input Impedance: Greater than 20k (balanced)
Maximum Input Level: +24 dB (16 Vrms)
Input Connectors (each channel): 3-pin XLR and 1/4-inch TRS, balanced, parallel Phono, unbalanced
Output Connectors (each channel): Speakon, 1/4-inch, Binding Posts
Amplifier and Load Protection: Short circuit, open circuit, thermal, RF protection Load protected against DC faults
Front Panel Controls and Indicators:
- Gain controls, 21 detents
- Red Clip LEDs, proportional, 0.1% THD threshold
- Green Signal LEDs, threshold -35 dB
- Blue Power LED, AC on
Rear Panel Controls: Full Range / Crossover switch
Dimensions (H x W x D): 3.5 x 19 x 10.1 inches (89 mm x 483 mm x 257 mm)
Weight: 25 lbs (11.5 kg)
