The TLM 170 R Black Multi-Pattern Large-Diaphragm Studio Condenser Microphone from Neumann is a stereo set of two multi-directional large-diaphragm condenser microphones that utilises FET 100 technology, a transformerless balanced output stage, low self-noise and an impressive dynamic range.

Five directional characteristics are selectable by means of a rotary switch. In the sixth position, marked "R", the directivities can be remotely controlled with the included N 248 power supply. No special cable is required for this purpose. The microphone features a 10 dB attenuation switch at the rear for extremely high sound pressure levels, and a high-pass filter to suppress structure-borne noise. A second switch at the rear allows the microphone to attenuate the frequency response below 100 Hz to suppress unwanted structure-borne noise.

The TLM 170 R can be used for many diverse applications in professional recording studios, in broadcasting, film and television, as well as for semi-professional productions.

The large-diaphragm capsule inside the protective grille exhibits a very smooth frequency response for all directivities over a wide angle of acceptance. The curves are flat and parallel to the 0° frequency curve up to 10 kHz within an angle of ± 100°. As a result, the TLM 170 R has a very uniform diffuse field response for all directivities. This is important in a reverberant environment, as more reflections arrive at the microphone from different directions. The acoustic information is not affected in its tonal quality when recorded by the microphone. This characteristic is achieved without resorting to corrective resonance effects.

The microphone maintains excellent impulse response reproducing transient music and speech without any colouration. The capsule is elastically mounted to avoid any structure-borne noise that could interfere with its operation.

Compared to the standard cardioid directivity, the hypercardioid characteristic more effectively suppresses lateral sound. The wide-angle directivity is particularly useful for recording large sound sources. The N 248 controls the directivity remotely by varying the phantom voltage. The range is ± 3V from the nominal value of 48V. The microphone's rotary switch must be in the R, remote control position. In this switch position, the TLM 170 R microphone analyses the absolute value of the phantom power supply and selects the corresponding directivity. A standard 3-pin microphone cable is used, similar to conventional microphone operation. Cable lengths can be up to 1000'.

With TLM technology, the usual output transformer is replaced by an electronic circuit. As with traditional transformers, it ensures good common mode rejection and prevents RF interference that could influence the balanced audio signal.

A tiltable side mount for attaching the microphone to booms or stands is included. The mount is equipped with rubber elements that effectively protect the microphone from mechanical shocks. If necessary, it can also be mounted on the other side of the microphone. When using the IC 4 cable, the mount and its bracket must be removed. The microphone can then be connected to the swivel connector of the cable.

All exposed surfaces of the capsule, including the diaphragms, are at earth potential. This technology makes them highly immune to electrical and atmospheric interference and contamination by dust particles.

- Large-diaphragm microphone with local and remote control
- Pressure gradient transducer with dual-diaphragm capsule
- Omnidirectional, wide cardioid, cardioid, hypercardioid and figure-8 directivities
- Switchable low-cut filter and 10 dB pre-attenuation
- Swivel mount fitted with elastic suspension