The TM115 is a feedforward controlled brickwall limiter that
uses a special, ultra fast peak rectifier circuitry. The attack time is extremely
fast. When set to the minimum of 20 µsec, the peak limiter reacts within
the first half wave of a 20 kHz sine wave. With fast attack setting and an adapted
release time, the TM115 can catch peaks of 3 to 5 dB without audible side effects
like pumping. The possible regulation range is determined by the release time
setting that is limited to a range below the release time of the human ear, which
is in the range of 0.3 sec per 10 dB. If the release time is longer, pumping
occurs. Unfortunately, fast release time results in regulation within the period
time of low frequency signals, which causes distortion. Another physical limitation
for the maximum gain reduction without negative side effects is the attack distortion
of bass signals using fast attack time settings. Check out the TM115b
offers additional features for better handling of these problems with critical
and physiological effects determine the limits for the maximum gain reduction
and end up in a compromise between acceptable low frequency distortion, attack
distortion of bass signals, and audible pumping. Finally, yet importantly, the
possible release time is also depending on the spectral density of low frequencies.
The higher the low frequency levels are, the lower is the possible gain reduction
without audible side effects.
The peak limiter operates free from any colorization of the audio signal or similar effects. The sound will not changes under regulation.
The device has independent controls for the Threshold and the Attack- and Release time. The threshold can be adjusted in the range from - 10 dB to + 20 dB. The 0 dB position is internally calibrated. The attack control allows variation from 20 µsec to 7 ms; the release time control has a range from 50 ms to 3 sec.
Due to the huge control ranges of all parameters, the peak limiter is well suited to be used as a 'hard-clip' compressor with slower attack settings as well. With this mode, the TM115 behaves like a compressor with a high ratio setting, which operates 'close' to the signal. Combining a TM115 with another compressor can increase the loudness gain significantly.
The fastest release time is 50 ms. This fast setting cannot be used
with low frequency signals due to the high distortion under regulation by the
physical effects, described in detail above; however, mid and high frequency
signals can benefit from such short release setting very well. The signal density
becomes very high, while the attack setting determines the transient response.
The TM115 is a 2U ToolMod device that fits into all ToolMod frames. As usual, horizontal and vertical versions are available.