The Model 2950 Channel One from SPL is a single channel strip which includes a number of powerful onboard tools for corrective and creative sound design when recording voices, instruments, and other or analog or digital sources (with optional A/D module).

The unit is built in the tradition of earlier SPL channel strips: the Frontliner, the original Channel One, and the Track One with an updated faceplate design. The device accepts three separate inputs: a balanced XLR-3F microphone input with selectable +48V phantom power, 180&Deg; phase reverse, and 50 Hz subsonic filtering; a 1/4" TRS low impedance line input with a precise balancing stage for connecting to studio grade equipment; and a low-noise high-impedance instrument input that can be easily accessed from the front panel.

The preamplifier stage of the processor features a transistor/12AX7-LPS tube design with a range from +8 dB to +68 dB of mic gain. The line signal gain range reaches from -12 dB to +22 dB, and instrument signals can be amplified between +48 dB and +39 dB.

The first processing module in the signal chain is a De-Esser which allows you to use a single knob for subtle and effective reduction of sibilants in the outgoing signal. The processor uses phase cancellation with the original signal which employ filters that only reduce s-frequencies without interfering with the remainder of the audio spectrum. An integrated auto threshold function allows the processing to occur independently of the input level, even at varying distances from the microphone.

A switchable insert send and return loop button allows for the use of external equipment for effects such as delay or reverb. The presence of the insert loop expands the flexibility of the device to an even wider range of recording applications.
The next processor in the signal chain is a compressor/limiter/noise gate module with a dedicated limit switch, a soft knee compression control knob with a maximum ratio of 1:2.5, a make up gain knob from 0 to +22 dB, and a noise gate that can operate over the signal's complete dynamic range.

The compressor module is followed by a three band EQ and FET distortion module that can be switched to operate before or after the compressor. A low mid frequency control covers a range form 30 to 700 H, a LMF-/+ knob determines the amount of boost or cut at the selected frequency between ±14 dB. Similarly, a mid/high frequency filter can be set between 680 and 15,000 Hz with a controllable gain or boost at this Q frequency within ±12 dB. An AIR Band module uses a coil-capacitor-filter with a center frequency of 17,500 Hz and a maximum possible accentuation of +10 dB or a maximum dampening of -10 dB. The FET distortion allows you to add distortion from 0% up to distinctly perceptible harmonics.

The next module provides an output gain control from -20 dB to +5.5 dB. A mute switch allows you to mute the output signal.
The final two controls include a playback control that regulates the volume of the playback signal that is passed to a musician who is monitoring with the included front panel 1/4" TRS stereo phono jack as well as a volume control for setting the volume of the microphone, instrument, or line signal.

For visual feedback the unit includes LED metering for s-detect, clip, signal presence, tube warm up, gain reduction, and PPM output. The unit can be modified with the installation of Lundahl I/O transformers.

Channels One
I/O 1x XLR-3F Microphone input 
1x 1/4" TRS Line input 
1x 1/4" TRS instrument input 
1x 1/4" insert return 
2x 1/4" playback inputs (left and right) 

1x 1/4" insert send 
1x 1/4" TRS output 
1x XLR-3M output
Phantom Power +48 V
Frequency Response Microphone Input: 10 to 100,000 Hz (100,000 Hz = -3 dB) 
Line/Instrument Input: 10 to 180,000 Hz (100,000 Hz = -3 dB)
Common Mode Rejection Microphone (at -20 dBu) 1 kHz: -80 dB/ 10 kHz: -78 dB 
Line/Instrument (at 0 dBu) 1 kHz: -80 dB/ 10 kHz: -78 dB/line input only
Total Harmonic Distortion Microphone (A-weighted) 
20 dB: -97.1 dBu 
40 dB: -91.1 dBu 
65 dB: -69.4 dBu 

Line/Instrument (A-weighted) 
5 dB:-99.4 dBu 
20 dB: -97.2 dBu 
42 dB: -79 dBu
Dynamic Range Microphone: 118 dB 
Line/Instrument: 119 dB
Input Impedance 20 kilohm 
Instrument: 1 Mohm
Maximum Input Level +22 dBu 
Instrument +14 dBu
Output Data Max. Output Level XLR/Jack: +20 dBu
Output Impedance: 50 Ohm
Headphone Amplifier Gain, Mic Input and 0 dBu Output Level
-20 dBu bei 25%
-10 dBu bei 40%
-5 dBu bei 55%
0 dBu bei 70%
+5 dBu bei 75%
+10 dBu bei 90%
+14 dBu bei 100%
Metering LED ladder, switches with function chosen
A/D Converter Optional 24 Hz/192 kHz Module 1090 A/D converter
Power Supply Toroidal Transformer: 20 VA 
Fuses: 315 mA (230 V/50 Hz) 
630 mA (115 V / 60 Hz)
Dimensions (WxDxH) Standard EIA 19" 
19.0 x 3.5 x 8.3" (IHE 482 x 88 x 210 mm)
Weight 9.15 lb (4.15 kg)

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