SPL CHANNEL ONE MK3 Channel Strips

SPL CHANNEL ONE MK3 Channel StripsIn the newest Mk3 version, this classic has been thoroughly revised and, in addition to a higher internal audio voltage (now + 18V) for even better, more detailed sound, a further improved preamplifier section, an integrated Transient Designer, a Tube Saturation stage and a Mic A B comparison option for two microphones and other great features that raise the modern recording and mixing studio to a new level of quality. With de esser, compressor and

In the newest Mk3 version, this classic has been thoroughly revised and, in addition to a higher internal audio voltage (now +/- 18V) for even better, more detailed sound, a further improved preamplifier section, an integrated Transient Designer, a Tube Saturation stage and a Mic A/B comparison option for two microphones and other great features that raise the modern recording and mixing studio to a new level of quality. With de-esser, compressor and equalizer, all the important tools of a real channel strip are still on board. Whether it's a microphone, line, or instrument signal, the Channel One Mk3 makes any source sound like a professionally recorded signal.

The new design of the SPL Studio Series perfectly highlights the sonic qualities of this 3rd generation Channel One.

Discrete Preamplifier
Channel One Mk3 is equipped with two discrete preamplifier.

Gain
The gain control can be used to adjust the preamplification. For microphone signals, a preamplification of up to 60 dB can be realized – so even really demanding microphones can show their qualities.

Comparing two microphones? No problem!
Channel One Mk3 offers two microphone inputs on the rear panel – Mic A and Mic B. Two microphones can be connected. This enormously simplifies the workflow. Thus, when comparing or changing microphones, it is no longer necessary to unplug them.

48V
The 48V switch activates the phantom power of 48 volts required for the use of condenser microphones. Phantom power can be activated individually for both microphone inputs!

Preamp Out – the direct way to reach your goal
The Preamp Out picks up the signal directly after the microphone amplifier. This signal can also be recorded on a separate track in the DAW, for example, to be on the safe side. If it is noticed after a recording session that the singer was a little louder in the perfect take and therefore hits the compressor too hard, this incorrect setting can still be changed afterwards. The signal recorded for safety can later be played back into the Channel One Mk3 via the Line In and be processed there with Tube Saturation, Compressor or other tools.

Analog plugin
Channel One Mk3 offers the possibility to process line signals. This means that sources with line level, such as an analog signal from an audio interface, can be processed with de-esser, compressor, limiter and equalizer and then be recorded again. In this way, Channel One Mk3 becomes an “analog plugin” within an insert of a DAW.

Instrument input
The low-noise instrument input is located easily accessible on the front.

PAD
The PAD switch attenuates the signal of the microphone input by 20 dB, so that even very high levels can be processed with the Channel One Mk3. This is the case, for example, with loud percussion or brass recordings.

ø
The phase reverse function reverses the polarity of the signal.
After pressing the switch, the phase is reversed by 180°.
Tip: We recommend checking the correct polarity before recording and correcting it if necessary. The phase inversion function can be used, for example, to correct a headphone monitor signal that may be out of phase. A voiceover artist, for example, hears himself through the headphones and simultaneously through the bones in his head. Phase inversion will cause an unnatural sound, and even minimal variations in distance to the microphone will cause drastic variations in the sound. Phase inversion can be applied to the microphone, line and instrument inputs. In general, you can always just try out whether a phase reverse has a positive effect on certain signals in the mix

A highpass filter with 6 dB per octave reduces impact noise below 80 Hz. This filter can be used for both preamplifiers.

Tube Saturation – magical tube sound
With this control the amount of tube saturation can be determined. The output level is
accommodated automatically, in extreme settings the level increases by only 6 dB.
Therefore decent to expressive harmonic distortions can be easily dialed in by turning
just one knob.

Saturation effects are generated through the tube being pushed to and beyond its
normal operating limits. In contrast to semiconductors, a tube thus pushed to such levels
does not clip from a certain level, approaching more gradually its level limits and thereby producing its typical tonal result, which in audio signal processing can have such often profitable aural effects — on one hand (and depending on the amount applied), from subtle to extensive harmonic distortion and on the other hand, a compaction of the sonic event, that is, a limiting effect that exhibits a pleasant, rounded or soft sound. Acoustically and also in its range of applications this can be compared very well with tape saturation effects.

Tube Post
The Tube Post switch changes the order of the Tube Saturation within the signal flow: When the switch is pressed, the Tube Saturation stage comes after the EQ stage and before the output stage; when the switch is not pressed, the Tube Saturation stage comes directly after the preamp and before the de-esser

De-Esser
Unobtrusively and effectively, the Auto-Dynamic De-Esser removes distracting S-sounds,
in a mix or on vocal tracks, by detecting only the “S-frequencies”, mixing them back into
the main signal phase-inverted, and thus simply deleting sibilants in the original signal.
The Auto-Threshold control maintains constant processing even as the singer's distance from the microphone varies. The result is tonally neutral, unobtrusive and extremely effective. Even at high S-reduction values, the de-essing has no significant effect on the
character and timbre of the voice.

S-Reduction
The S-Reduction control adjusts the intensity of the S-sound reduction. In practice, S-Reduction settings between -2 dB and -8 dB achieve the best results for most applications.

Low & High
The Low and High switches can be used to activate or deactivate the low or high band
de-esser, meaning a different center frequency for the de-esser. If no switch is pressed, the de-esser is not active. If the Low switch is pressed, the low de-esser band is activated with a center frequency of 6.4 kHz and a bandwidth of 4.4 kHz. If the High switch is pressed, the high de-essing band with a center frequency of 11.2 kHz and a bandwidth of 5.5 kHz is activated. If both switches are pressed, Low and High band de-esser are active.

SPL Transient Designer
With the Transient Designer it is possible to manipulate the envelopes of audio signals level-independently (no threshold!). Accelerate or slow down transients, lengthen or shorten sustain times – with just two controls: attack and sustain. All time constants are automated in a musical way and optimize themselves adaptively according to the characteristics of the input signal.

On
The On switch activates the Transient Designer section, consisting of the Attack control and the Sustain control.

Attack
Attack can be used to increase or attenuate the transient phase of a signal by up to 15 dB. A positive attack value increases the amplitude of the transient response. Negative attack values lead to an attenuation.

Sustain
Sustain can be used to increase or attenuate the sustain phase of a signal by up to 24 dB. Positive sustain values extend the sustain. Negative Sustain values shorten the sustain.

Specifications

Analog inputs & output; XLR & TRS Jack (balanced)

• Maximum input gain (Mic, +9,5dB – +68 dB) 13.5 dBu (33.5 dBu mit PAD-Schaltung)
• Maximum input gain (Line, -20 dB – +16 dB) 22.5 dBu (+42 dBu bei -20 dB)
• Maximum input gain (Instrument, -6 dB – +30dB) 15 dBu (+27 dBu bei -6dB )
• Input impedance (Mic/Line) 10 kΩ
• Input impedance (Instrument) 1.1 MΩ
• Output impedance 75 Ω
• Frequency range 10 Hz – 200 kHz
• Equivalent Input Noise (EIN) -126 dBu
• Noise (A-weighted, Mic Preamp, 150 Ω, 30 dB Gain) -95 dBu
• Noise (A-weighted, Mic Preamp, 150 Ω, 50 dB Gain) -79.5 dBu
• Noise (A-weighted, Mic Preamp, 150 Ω, 68 dB Gain) -61.7 dBu
• Noise (A-weighted, Line/Instr Preamp, 600 Ω, 5 dB Gain) -96.5 dBu
• Nosie (A-weighted, Line/Instr Preamp, 600 Ω, 20 dB Gain) -84.7 dBu
• Common mode rejection (1 kHz) Mic Input < 80 dB
• Gleichtaktunterdrückung (1 kHz) Line Input < 50 dB
• THD+N Ratio (1 kHz), Mic 30 dB Gain 0.0022 %
• THD+N Ratio (1 kHz), Mic 50 dB Gain 0.013 %
• THD+N Ratio (1 kHz), Mic 68 dB Gain (Max.) 0.048 %
• THD+N Ratio (1 kHz), Line 0 dB Gain 0.0022 %
• THD+N Ratio (1 kHz), Line 16 dB Gain 0.0017 %
• THD+N Ratio (1 kHz), Instrument 0 dB Gain 0.012 %
• THD+N Ratio (1 kHz), (100 kΩ source impedance)

Internal Linear Power Supply with Shielded Toroidal Transformer

• Operating voltage for analog audio +/- 18 V
• Operating voltage for relays and LEDs +12 V
• Tubes anode voltage +250 V
• Tubes heating voltage +12.6 V
• Phantom power 48 V

Mains Power Supply

• Mains voltage (selectable) 230 V AC / 50; 115 V AC / 60 Hz
• Fuse for 230 V T 315 mA
• Fuse for 115 V T 630 mA
• Power consumption max. 22.3 VA

Reference: 0 dBu = 0.775V

Dimensions & Weight

• W x H x D (width x height x depth) 482 x 88 x 210 mm / 19 x 3.46 x 8.27 inch
• Unit weight 6 kg / 13.22 lbs