The Lampifier Model 711 is a dynamic stage microphone with a fixed cardioid response. Built into the mic’s handle is the company’s proprietary audio processor, a phantom-powered gating and compression circuit that can tailor the mic’s response to a variety of distinct applications.
What are the differences between the Model 711 and Model 111?
• The compression/noise gate circuit is identical.
• The audio bulb is identical.
• The Model 711 and Model 111 use different moving-coil cartridges
• The Model 711 has a Cardioid response, whereas the Model 111 has a more-directional supercardioid response.
• The Model 711 has a smoother frequency response than does the Model 111 (which has a presence peak in the vocal range).
• The Model 711 lacks the “bass boost ring” of the Model 111.
Like the Model 111, the 711 provides 308 distinct “programs,” created by adjusting the following parameters on the audio processing circuit:
• Compression threshold - 7 settings, from low sensitivity (0dB) to high sensitivity (-24dB)
• Noise Gate threshold - 11 settings, from least gating (-55dB) to most (-5dB)
• Noise Gate release - slow or fast
• Output Volume - low or high
The audio-processing circuit consists of a pair of linear amplifiers, a resistor, and a light bulb.
The light bulb is not an optical compressor. Rather, the audio signal from the mic’s dynamic capsule flows through the bulb’s tungsten filament, which heats up with higher-gain signals, increasing the wire’s resistance. As resistance increases, output signal strength from the bulb decreases.
When the lamp is under-driven, the compression effect of the lamp is minimal, Conversely, at higher gains, the compression effect of the lamp is more pronounced. Therefore, the amount of effective compression is adjusted by controlling the output gain of the amplifier at the front of the circuit.
The processing circuit is phantom-powered — unlike most dynamic vocal mics, the Model 711 requires +15–48V phantom power.
Lampifier ships the Model 711 in any of the following eight preprogrammed flavors. All of these can be adjusted by the user to suit any specific application.
• (1) Intimate Stage Vocal/Instrument/String Solo - maximum compression, minimal gating, low output
• (2) Live Address - moderately high compression, minimal gating, low output. Ideal for handheld applications; similar to the Podium/Lectern program.
• (3) Public Speaking/Podium/Lectern - maximum compression, moderate gating, low output