The Pendulum Audio PL-2 is a JFET/MOSFET Peak Limiter. Brickwall Peak Limiting in the Analog Domain.
The PL-2 is a stand-alone two channel version of the very popular peak limiter in our Quartet II Tube Recording Channel. It uses a novel approach to brickwall limiting in the analog domain, one that is fast enough to prevent digital overs without using time delay or phase-shift delay techniques. This allows us to keep the analog signal path short, and keep the limiting circuit 'switched out' of the signal path below the peak limiting threshold. Distortion for all levels below the the limiting threshold is low, and does not rise as the threshold for limiting is approached. Unlike analog peak clippers, which chop off the top and bottom of the waveform, our limiter retains dynamic information at the top of the peak.
The PL-2 has two modes of peak limiting, using either junction field-effect transistors (JFET) or metal-oxide semiconductor field effect transistors (MOSFET) as the control elements. While both are equally capable of brickwall limiting, each type has its own characteristic sound. The JFET tends to be a stiffer, harder mode of limiting, while the MOSFET has a softer, more compliant response. The resulting waveforms look different, and each device has its own characteristic sound.
In addition, Input and Output gain controls allow the user to scale the gain structure for a wide range of applications, from driving the front end of an A/D converter at +22 dBu, to inserting it as an effect into a +4 dBu patch bay. Several units can be linked for multi-channel applications.
Each channel also has an expanded 13 segment LED display which accurately indicates peak reduction.
JFET (hard) or MOSFET (soft) peak limiting modes
Two independent channels with stereo link
Precise readout of peak reduction
Stepped input and output controls - ideal for mastering or session recall
Limiter circuit out of the signal path when below threshold
Transformerless Class A solid-state design
Circuit Type: Class A solid-state peak limiter with transformerless balanced inputs and outputs
and dual mono or stereo operation
Input Sensitivity: +4dBu Input Impedance: 20k Input Gain: 0 to +10dB in 1dB steps Freq. Response: -1.0dB 5Hz and 80kHz Noise: >90dB below +4dBu Distortion: less than 0.03% THD+N, 20Hz to 20kHz, at all signal levels below limiter threshold Output Impedance: 300 ohms Output Gain: -10 to +10dB in 2dB steps Max. Output Level: +27dBu Polarity: input and output XLR connectors are pin 2 hot Display: 13 segment LED ladder from 0 to -8dB
Power: 120V or 240Vac, 16W Power Supplies: +± 18Vdc, +15Vdc, +12Vdc, fully regulated Dimensions: 1U enclosure, 19" x 1.75" x 8.0" (48.2 x 4.4 x 20.32 cm) Weight: 6.7 lb. (3.1kg)