Radial Firefly 萤火虫电子管DI直插盒批发零售 隔离变压器 消除接地回路的噪声DI直插盒 吉他DI盒 Radial DI直插盒
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Firefly 萤火虫电子管DI直插盒
应用特点
u 电子管驱动电路，温暖的音色再现
u 可调整 4 兆欧姆阻抗压电拾音器之间的开/关切换。
u 可变低切滤波器滚降低音共振，避免导致反馈。
u TRIM-A 用于匹配 A-B 两种乐器之间增益输入电平控制
u 静音指示灯显示静音功能，通过可选的 JR?2 脚踏开关
u DRAGTM 保留通过调整负荷被动拾音器自然色调
u 输出采用变压器消除噪声
u 可变高通滤波器的谐振
u 录音贝司直接完美前端
u 独特书本式设计，保护控制旋钮不受外界撞击的伤害
u 军用级 14 规格钢材焊接制，使电路板不会发生扭转
u 底部防滑垫处理，提供物理机械隔离和电气绝缘
技术参数
u 频率响应：20Hz-20kHz
u 增益：20dB
u 动态范围：>100dB
u 信噪比：85dB+4dBu
u 背底噪声：-98dB
u 等效输入噪声：-101dBu
u 输入电平：-12dB-20dB
u 相位偏差：-3°@1KHz
u 总谐波失真：0.015%@-5dBu
u 互调失真：0.002%@-3dBu
u 输入阻抗：22-50k?
u 输入阻抗：3.9Mk?
u 输出阻抗：150Ω
u 输入衰减：-15dB
u 低通滤波器：-3dB@5Hz-500Hz
u 尺寸：146x210x45mm
u 重量：1.8Kg
Firefly Tube Direct Box
High Output Vacuum Tube DI Box
The Firefly? is a studio quality direct box that combines the clarity and detail of an active DI with a tube drive circuit that provides vintage warmth and pleasing harmonics to any instrument.
Photos
12AX7 tube drive and class-A front end
Dual inputs with separate gain & remote switching
Drag control load correction for optimal tone
Variable output connects directly to a PA
+ More Features
Fatten up your DI tracks
The Firefly's drive circuit utilizes a 12AX7 vacuum tube, which is the most popular tube made today and can be found in nearly all guitar amplifier designs. This helps provide the character and feel of a vintage device, while still maintaining low distortion and noise profiles common to modern pro audio equipment. The Firefly excels when used on instruments that sound too clinical or one dimensional when recorded directly, adding punch and warmth to bass or guitar tracks both on stage and in the recording studio.
Firefly Specifications
When viewing specifications, one has to differentiate between products that are designed to provide accuracy versus those designed to color and enthral. The Firefly falls into the second category. Therefore the specifications that are normally used to qualify ‘accuracy’ have been omitted leaving those that are still relevant such as noise. One must also consider that tubes are inherently noisy compared with solid state devices, so even here, the specs may seem less than ideal. But tubes bring a sonic character that excites. With the Firefly… one must really listen to appreciate.
Specifications
Block Diagram
Graphs
Specifications
Audio circuit type: 100% discrete class-A FET with tube drive
Number of channels: 1 with A/B input select
Frequency response: 20Hz ~ 20kHz
Dynamic range: >100dB
Gain: 20dB (Maximum)
Total harmonic distortion: 0.15% from 20Hz ~ 20kHz
Intermodulation Distortion: 0.3%
Input Impedance: Drag Off: 3.9 Meg-Ohm | Drag On: Variable 22k ~ 500k
Output Impedance: 150?
Equivalent Input Noise: -101dB
Noise: -98dB at unity gain
Maximum Input: Variable from -12dB ~ +20dB
Features
180° polarity reverse, Ground lift, HPF, Drag Control, Level Control, Phase Adjustment, Effects Loop, Remote Footswitch, Boost
Input Connectors: 1/4" Hi-Z, 1/4" TRS Insert
Output Connectors: XLR, 1/4"
General
Construction: 14-gauge steel
Size (L x W x D): 5.75" x 8.25" x 1.75" (2.75" with handle) 146mm x 210mm x 45mm (70mm with handle)
Weight: 3.95lbs. (1.80kg)
Power: 5-pin XLR, +/-16V & 48V, 1600mA
Conditions: For use in dry locations only between 5°C and 40°C
Warranty: Radial 3-year, transferable
