TM301 Mic Pre with Monitor Mixer

The TM301 mic pre module with monitor mixing section is the most important part of the TM300 live recording system. It combines all stages that are necessary for recording and monitoring of a single track.

Record Channel:

  • transformer balanced, ultra low-noise mic pre
  • one or two transformer balanced split outputs
  • high-pass and low-pass filter
  • very fast brickwall-limiter
  • switched, buffered, balanced insert
  • own PFL switch for record output

Monitor Channel:

  • Record/Monitor input select
  • rotary fader with calibrated center detent
  • pan pot with calibrated center detend
  • LED PPM with 40 dB display range
  • PPM can be switched to record or monitor
  • insert can be assigned to monitor
  • 2 aux sends with pre/post switches
  • PFL switch for the monitor chain

Mic Pre
The mic pre section of the TM310 live recording module is identical to the ToolMod TM101. The transformer balanced input in combination with hand picked semiconductors results in excellent noise performance, very flat phase response, also at low frequencies and a headroom of + 30 dBu. The gain is controlled by a pot in the range from 24 to 70 dB. PAD adds 24 dB attenuation pre the input transformer. With PAD the input can handle levels of + 30 dBu. The noise figure is below 2 dB (e in of -128.5 dBu-RMS with 150 Ohms/ -127.0 dBu-RMS with 200 Ohms) with gain setting between 50 and 70 dB but remains below 3 dB also with lower gains of 40 dB. See the Diagram Noise vs Gain for details. 48 V phantom power is included and can be activated by the P48 switch. The proven combination of pristine sound performance and warmth makes this mic pre the best choice for any application.

With live recordings it is almost impossible to use an own set of microphones for the recording. Usually one mircrophone set will be shared among the recording and the live sound consoles. To avoid ground loops and strange effects, splitters are used to separate the different consoles. Using passive splitters has many disadvantages, since these additional transformers are installed exactly there where the signal level is extremely low and the source impedance is rather high. It is obvious that any load that is attached to the sensitive output of the microphone can and will alter the entire performance of the microphone dramtically. Long cables between microphone, splitter and the consoles add a high capacitive load that makes the entire situation worse as far as high frequency performance, frequency and phase response are concerned. An active splitter avoids the problem of high load on the microphone outputs; however, a huge part of the sound performance depends on the mic pre and the interaction between the microphone and the input of the pre amp. With active splitters, the splitter is the mic pre and the pre amplifiers of the recording system have only minor influence on the entire sound performance. Of course, this is also true as far as the noise performance is concerned. If the splitter pre amp is noisy, this noise will be added to the microphone signal. If your concern is best possible quality of your live recording, both principles should not be used.

The Splitter function of the TM301 makes it possible to use the microphone on stage just and only for recording. The mic pre has an additional transformer balanced output that operates independent of the gain setting. The level at the split output is 6 dB higher than the input level. The output impedance of this output is below 100 ohms. A second output transformer can be installed as an option.

high resolution picture

TM301 Block Diagram high resolution picture

Block Diagrem

Live Recording System


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