Gear Hunter

SPL - MARC ONE

Description

The Monitor and Recording Controller with innovative features and a 32-bit AD/DA converter. A monitor controller with which you can also record. And both in impressive sound quality!

Key Features
* Choose between two stereo speaker sets, one with a subwoofer
* Perfect and precise control with the Analog Volume Controller
* Professional monitoring features
* Connect two analog sources - stereo or mono, blanaced (TRS) and unbalanced (TS) nad a computer or mobile device for stereo playback and recording
* Blend the monitoring signal to taste
* The 32-Bit Velvet Sound™ DA Converter plays back up to 768kHz and DSD4
* The Line Out carries the mix between the Line Inputs and USB playback
* Connect your headphones to the premium quality headphone amp
* SPL's famous Phonitor Matrix; mixing on headphones sounds like mixing on speakers
* Aluminum front panel and metal housing

Speakers & Subwoofer
You can listen to your production via two switchable pairs of speakers. A subwoofer is also switched on and off with speaker pair A. In the middle position of the switch, the speakers are switched off, which is convenient because you don't have to turn the volume control back.

Monitor
You can adjust the volume levels at lightning speed with the Monitor knob. In the middle, all input signals are equally loud. To the left, the analog stereo inputs get louder and the USB input signal gets quieter. Turning from the center to the right does the opposite. So you can quickly and intuitively set the right volume levels.

Line Inputs & USB
Two analog stereo inputs and one digital USB input can be connected to the Marc One. The DAW (Digital Audio Workstation) is preferably connected via USB. Other players like CD player, mixer, synthesizer or an analog tape machine / tape deck can be connected to the analog line inputs.

32-bit AD/DA Converter
The converter chip used is the superior AK4490, which belongs to the new generation of premium 32-bit DACs and is equipped with AKM's Velvet Sound®. This technology makes the finest details audible thanks to its low-distortion architecture. Sampling frequencies up to 768kHz PCM (16x CD resolution) are supported and DSD (Direct Stream Digital) playback is supported up to DSD4 or DSD256 (11.2 MHz) resolution. Thus the Marc One qualifies for the currently highest resolution audio playback.

The USB connection is Class Compliant. This means that all Mac computers and iOS devices like iPads and iPhones can use the full performance bandwidth of the AD/DA converter without driver installation. iOS devices require the camera adapter. For Windows, a driver is required.

Line Out
The Line Out carries the mix between the Line Inputs and USB playback and is controlled by the Monitor knob. The level is unity gain, thus independent of the volume control. So the Marc One can be looped between devices without "losing" an output. For example, if several people should listen in via headphones, headphone amplifiers can be connected to the Line Out. But you can also record the signal analog or send it to a mixer for further processing.

Three Monitoring Modes
Three monitoring modes are offered by the Marc One. In the middle is the default setting "Stereo". To check the mono compatibility set the switch to "Mono". The special feature is the channel swap function:

L/R > R/L reverses the stereo image. L/R becomes R/L. This is especially important and extremely time-saving when you are searching your sound library for samples in video dubbing that should match a scene with direction of movement. If the direction is not correct, you usually have to load the sample into the DAW to switch channels before you can hear if the sample fits. With the L/R > R/L function this is no longer necessary. You can now simply swap the direction of movement while prelistening samples in the library.

The Headphone Power Amp
Marc One delivers a rich headphone sound and it can get really loud. The output stage of the headphone amplifier is designed as a push-pull amplifier in class AB mode. The bipolar transistors share the amplification of the positive and negative half-waves, which produces a higher gain and a higher output voltage than in Class A operation, where only one transistor amplifies both half-waves.

The output stage transistors are thermally coupled and thus run particularly coherently, which contributes to a consistent and stable sound image.

The power supply has a buffer circuit with low source resistance, ensuring generous current reserves even when driving low-impedance headphones.

The Revolution
The Revolution in the headphone amplifier is the Phonitor Matrix, with adjustable crossfeed, thanks to which you can create mixes with headphones that sound the same on speakers. The Phonitor Matrix in its largest expansion stage has three setting parameters: Crossfeed, Speaker Angle and Center Level.

In the Marc One, the center level is preset to -1 dB and the speaker angle to 30 degrees. These are the most commonly used values. The crossfeed function determines the so-called interaural level difference.

The intensity of the crossfeed is fully variable. At the beginning of the control path the crossfeed circuit is not in the audio path. Dialing the control in switches on the crossfeed circuit via relay (hysteresis circuit). The audio signal therefore does not pass through the crossfeed stage if this is not desired.

Best fit
If the active speakers or the power amplifier are very sensitive the playback may already be fairly loud when the Volume control is in the first third of its control range. By activating the -10 dB dip switch the output level is lowered to accommodate for a wider usable range of the Volume control. With the Rec 1+2 dip switch both line inputs are mixed together and can be recorded via USB.

The Power Supply
Good sound always starts with the power supply. This is where you lay the foundation for the performance of the entire device. Marc One comes with a 12 V plug-in power supply unit, while the secondary power supply inside generates a voltage level of +/-17 Volts for the analog audio sections with which professional levels of up to +22.5 dB can be achieved. An elaborate low-drop operating voltage regulation provides more "juice" and regulates cleanly even when the maximum operation voltage is reached.

The Marc One delivers full power when used with the included 1.5 A power supply. Only use the 12 V plug-in power supply unit within the scope of delivery. The ON-switch puts the Marc One into operation.

Specifications

Analog inputs & outputs; 6.35 mm (1/4") TRS Jacks
Input gain (max.): +22.5 dBu
Line Input 1 (balanced): Input impedance: 20 kΩ
Line Input 1: Common mode rejection: < 60 dB
Line Input 2 (unbalanced): Input impedance: 10 kΩ
Output gain (max.): Speaker Outputs (600 Ω): +22 dBu
Line Output (unbalanced): Output impedance: 75 Ω
Speaker Output 1 (balanced): Output impedance: 150 Ω
Sub Output low filter: none (full range)
Sub Output (balanced): Output impedance: 150 Ω
Speaker Output 2 (unbalanced): Output impedance: 75 Ω
Frequency range (-3dB): 10 Hz - 200 kHz
Dynamic range: 121.5 dB
Noise (A-weighted, 600 Ω load): -99 dBu
Total harmonic distortion (0 dBu, 10 Hz 22 kHz): 0.002 %
Crosstalk (1 kHz): < 75 dB
Fade-out attenuation: -93 dB

USB, 32-Bit AD/DA
USB (B), PCM sample rates: 44.1 / 48 / 88.2 / 96 / 176.4 / 192 / 352.8 / 384 / 705.6 / 768 kHz
USB (B), DSD over PCM (DoP), sample rates: 2.8 (DSD64), 5.6 (DSD128), 11.2 (DSD256) MHz
0 dBFS calibrated to: 15 dBu
Noise (A-weighted, 44.1/48 kHz sample rate): -113 dBFS
Dynamic range (44,1/48 kHz sample rate): 113 dB
THD + N (-1 dBFS, 10 Hz 22 kHz): 0.0012 %

Headphones Output; 6.35 mm (1/4") TRS Jack
Wiring: Tip = Left, Ring = Right, Sleeve = GND
Source impedance: 20 Ω
Frequency range (-3 dB): 10 Hz - 200 kHz
Noise (A-weighted, 600 Ω): -97 dBu
THD + N (0 dBu, 10 Hz 22 kHz, 600 Ω): 0.002 %
THD + N (0 dBu, 10 Hz 22 kHz, 32 Ω): 0.013 %
Max output power (1 kHz, 600 Ω): 2 x 190 mW
Max output power (1 kHz, 250 Ω): 2 x 330 mW
Max output power (1 kHz, 47 Ω): 2 x 400 mW
Fade-out attenuation (600 Ω): -99 dB
Crosstalk (1 kHz, 600 Ω): -75 dB
Dynamic range: 117 dB

Internal Power Supply
Operating voltage for analog audio: +/- 17 V
Operating voltage for headphone amplifier: +/- 19 V
Operating voltage for relays and LEDs: + 12 V
Operating voltage for digital audio: +3.3 V, +5 V

External Power Supply
AC/DC switching adaptor: Mean Well GE18/12-SC
DC plug: (+) pin 2.1mm; (-) outside ring 5.5mm
Input: 100 - 240 V AC; 50 - 60 Hz; 0.7 A
Output: 12 V DC; 1.5 A

Dimensions W x H x D (width x height incl. feet x depth): 210 x 49.6 x 220 mm / 8.23 x 1.95 x 8.66 inch
Unit weight: 1.5 kg / 3.3 lbs