• Account
  • View Shopping Cart

Menu Search View Shopping Cart Call Us

SPL Channel One Mk3 Channel Strip  From SPL

The Channel One Mk3 is the ideal channel strip for reliable results with the highest sonic demands. Extensive automation for fast operation and musical sound characteristics guarantee first-class recordings from the first take.



"Experience the Difference"

Sound Pure's 3-Year Warranty

Our Free 3-Year Warranty!
In addition to the standard included manufacturer warranty, virtually all new products carry our exclusive, industry-leading, absolutely free, Sound Pure 3-Year Warranty, which includes PARTS & LABOR. This high-value perk is our way of providing the ultimate in added value to enhance the unique personal touch our small, dedicated team contributes to each purchase.
Learn more »

Lifetime Support

Free Lifetime Technical Support!
Our small team of dedicated experts is here to help the original purchaser for the lifetime of the product. Why? Because we care about building real relationships with our customers for life and stand behind every product we sell.

Free Shipping

This Product Ships Free!
Products ship from our well-located, climate- and humidity-controlled warehouse absolutely free (inside the continental USA). Low-cost international shipping options exist for most products.
Contact us for details »
Contact us for up-to-date delivery estimate.
Payments as low as $52/mo.

Manufacturer's Description from SPL

Tube Preamp

The pre-amplification stages offer three inputs:

  • The microphone input has 48 V phantom power, polarity reversal and an LF cut filter.

  • The line input has a precise balancing stage for connecting additional studio equipment.

  • The low-noise instrument input is easily accessible on the front panel.


The De-Esser removes annoying S-sounds without affecting the sound. In contrast to conventional compressor techniques, the S-frequencies are detected in a very narrow band and are mixed in phase reversed to the original, whereby the S-sounds are deleted very unobtrusively.

The De-Esser works in Auto-Threshold mode. This ensures constant processing even if the distance to the microphone and thereby the input level fluctuates. Just one-knob is needed to set the desired S-Reduction.



Via the insert (send/return) external effect devices (reverb, delay) can be inserted or the pure preamp signal can be sent out.


Compressor & Gate

The compressor/limiter section is based on SPL’s Double-VCA-Drive circuit, which provides excellent noise and distortion data and delivers musical results even at extreme settings.

The compressor is also extremely easy and fast to adjust with just one control.

The Noise Gate with Auto-Release-Circuit works crackle- and flutter-free; reverb tails are “detected” and not cut off.


Equalizer & FET Distortion

A new EQ section has been designed for Channel One, specifically designed for processing voices and acoustic and electronic instruments.

In addition to low-, mid-hi and air-band filters, a field-effect distortion stage is used to equalize distortion-prone signals full of character.


Output & HP-Monitoring

Unique in this product category:

With the headphone monitor, the singer/speaker can finally be fed an individual mix without latency problems. The mix via a mixing console is no longer necessary.




Optional Equipment


Lundahl Transformers


The Sonic Aspects

Transformers are used as an alternative to electronic balancing stages in the inputs and outputs.

Transformers can be found in many classics of audio engineering. They make the bass and fundamental tines rounder and give it a little more punch. The high and overtone range sounds a bit silkier and more present.

We find transformers to be advantageous, especially for voices. For highest precision and speed in signal transmission (transient processing), however, electronic stages are better suited. The bottom line is that it is a question of taste and application.



In the Mic Preamplifier

In the case of preamplifiers or channel strips, the 2161 input transformer, which is specially designed for microphone inputs, provides an additional gain of up to 14 dB (depending on the microphone), which must then be added to the scaling.

This relieves the microphone preamplifier. Since the transformer ratio passively increases the level, no noise is added. Therefore, the input transformer is more important than the output transformer in preamplifiers.

However, it is only when both transformers are fitted that all positive sonic aspects are achieved – as well as increased operational reliability.



AD Converter Module 1090

The 24 bit converter module provides an SPDIF output which is available as coaxial and optical output.

The internal sampling rate can be set with switches to 44.1, 48, 88.2 and 96 kHz. Other sampling rates (32, 176.4, 192 kHz) can only be set with an external synchronization signal.


About Manufacturer

Sound Performance Labs! Full Range of Analog, Tube, and Digital rack gear with an innovative twist. With their most famous transient designer product, SPL has quickly become a household name in both the recording and live sound arenas.


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

Maximum input gain (Mic)

21.5 dBu

Maximum input gain (Instrument)

14 dBu

Input impedance (Line)

20 kΩ

Input impedance (Instrument)

1 MΩ

Output impedance

100 Ω

Frequency range (-3 dB)

10 Hz – 100 kHz

Crosstalk (1 kHz)

-108 dBu

Noise (A-weighted, Mic Preamp, 150 Ω, 20 dB Gain)

-97.1 dBu

Noise (A-weighted, Mic Preamp, 150 Ω, 40 dB Gain)

-91.1 dBu

Noise (A-weighted, Mic Preamp, 150 Ω, 62 dB Gain)

-67 dBu

E.I.N. (150 Ω)

-129 dBu

Noise (A-weighted, Line/Instr Preamp, 600 Ω, 5 dB Gain)

-99.4 dBu

Noise (A-weighted, Line/Instr Preamp, 600 Ω, 20 dB Gain)

-97.2 dBu

Noise (A-weighted, Line/Instr Preamp, 600 Ω, 42 dB Gain)

-79.4 dBu

Common mode rejection (1 kHz)

80 dB


Internal Linear Power Supply with Shielded Toroidal Transformer

Operating voltage for analog audio

+/- 15 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. 20 W


Dimensions & Weight

W x H x D (width x height x depth)

482 x 88 x 300 mm

19 x 3.46 x 11.8 inch

Unit weight

4.85 kg

10.69 lbs

Shipping weight (incl. packaging)

6.5 kg

14.33 lbs