ART Digital MPA II

Two-channel valve mic preamp with switchable 48V phantom power and continuously variable input impedance.&nbsp;<br />This model adds A/D conversion for convenient integration with digital systems.<br />The variable impedance can have a significant effect on the sound of the connected microphone; in particular, many dynamic models, including passive ribbons, prefer to see a higher impedance.<br />The unit can be set up for dual-mono, conventional stereo or M/S (Mid/Side) operation.&nbsp;<br />In this last role, channel one is used for the 'Mid' mic and channel two for the 'Sides'.&nbsp;<br />Further tonal variety is offered by the ability to run the 12AX7 valves at low or high anode voltages.<br /><br /><br />It's a solidly built unit, with a stylish front panel. The two large baclit VU meters and chunky knobs give it a glorious retro look.&nbsp;<br />Further LED bar-graph meters, labelled Tube Warmth and set between the VU meters, show the amount of tube drive being used.&nbsp;<br />While the mic inputs and balanced XLR and TRS jack outputs are on the rear panel, a high-impedance instrument input is conveniently positioned on the front panel, this taking precedence over the mic input when connected.&nbsp;<br />A rear-panel button allows the output level to be set to +4dBu or -10dBv, and the meter calibration automatically follows this setting.<br /><br />The mic input is a solid-state design, with a rotary control to set the initial gain. This has only a 40dB range, but an extra 20dB of gain can be applied before the tube stage.&nbsp;<br />Having an extra gain boost selectable in this way helps the preamp to run at lower gains while still maintaining a high signal-to-noise ratio.&nbsp;<br />A combination of the input gain and this 20dB 'boost' can be used to drive the tube stage as hard as you feel appropriate.&nbsp;<br />A further 10dB is available via the output gain control, so there's an overall maximum gain of 70dB.<br /><br />Next to the input gain control is the one that governs input impedance, which ranges from 150O to 2.4kO.&nbsp;<br /><br />To keep the lows under control, there's a smooth, 6dB/octave low-cut filter that can be swept from 10Hz to 200Hz.&nbsp;<br /><br />Four illuminated buttons beneath the VU meter are used to select 'normal' or +20dB of gain, phantom power, high or normal 'plate' voltage, and polarity inversion.<br /><br />A further button mounted between the channels selects the M/S decoding matrix, so that an M/S mic pair fed through the unit will produce a standard stereo signal at the output.&nbsp;<br /><br />At the extreme right of the unit is a 'stereo' button that allows the rightmost output-level control to function instead as a stereo balance, while the leftmost output-level control operates as a master stereo level control.<br /><br /><br />
Two-channel valve mic preamp with switchable 48V phantom power and continuously variable input impedance. 
This model adds A/D conversion for convenient integration with digital systems.
The variable impedance can have a significant effect on the sound of the connected microphone; in particular, many dynamic models, including passive ribbons, prefer to see a higher impedance.
The unit can be set up for dual-mono, conventional stereo or M/S (Mid/Side) operation. 
In this last role, channel one is used for the 'Mid' mic and channel two for the 'Sides'. 
Further tonal variety is offered by the ability to run the 12AX7 valves at low or high anode voltages.


It's a solidly built unit, with a stylish front panel. The two large baclit VU meters and chunky knobs give it a glorious retro look. 
Further LED bar-graph meters, labelled Tube Warmth and set between the VU meters, show the amount of tube drive being used. 
While the mic inputs and balanced XLR and TRS jack outputs are on the rear panel, a high-impedance instrument input is conveniently positioned on the front panel, this taking precedence over the mic input when connected. 
A rear-panel button allows the output level to be set to +4dBu or -10dBv, and the meter calibration automatically follows this setting.

The mic input is a solid-state design, with a rotary control to set the initial gain. This has only a 40dB range, but an extra 20dB of gain can be applied before the tube stage. 
Having an extra gain boost selectable in this way helps the preamp to run at lower gains while still maintaining a high signal-to-noise ratio. 
A combination of the input gain and this 20dB 'boost' can be used to drive the tube stage as hard as you feel appropriate. 
A further 10dB is available via the output gain control, so there's an overall maximum gain of 70dB.

Next to the input gain control is the one that governs input impedance, which ranges from 150O to 2.4kO. 

To keep the lows under control, there's a smooth, 6dB/octave low-cut filter that can be swept from 10Hz to 200Hz. 

Four illuminated buttons beneath the VU meter are used to select 'normal' or +20dB of gain, phantom power, high or normal 'plate' voltage, and polarity inversion.

A further button mounted between the channels selects the M/S decoding matrix, so that an M/S mic pair fed through the unit will produce a standard stereo signal at the output. 

At the extreme right of the unit is a 'stereo' button that allows the rightmost output-level control to function instead as a stereo balance, while the leftmost output-level control operates as a master stereo level control.



£299.00 This item is Secondhand
Two-channel valve mic preamp with switchable 48V phantom power and continuously variable input impedance.&nbsp;<br />This model adds A/D conversion for convenient integration with digital systems.<br />The variable impedance can have a significant effect on the sound of the connected microphone; in particular, many dynamic models, including passive ribbons, prefer to see a higher impedance.<br />The unit can be set up for dual-mono, conventional stereo or M/S (Mid/Side) operation.&nbsp;<br />In this last role, channel one is used for the 'Mid' mic and channel two for the 'Sides'.&nbsp;<br />Further tonal variety is offered by the ability to run the 12AX7 valves at low or high anode voltages.<br /><br /><br />It's a solidly built unit, with a stylish front panel. The two large baclit VU meters and chunky knobs give it a glorious retro look.&nbsp;<br />Further LED bar-graph meters, labelled Tube Warmth and set between the VU meters, show the amount of tube drive being used.&nbsp;<br />While the mic inputs and balanced XLR and TRS jack outputs are on the rear panel, a high-impedance instrument input is conveniently positioned on the front panel, this taking precedence over the mic input when connected.&nbsp;<br />A rear-panel button allows the output level to be set to +4dBu or -10dBv, and the meter calibration automatically follows this setting.<br /><br />The mic input is a solid-state design, with a rotary control to set the initial gain. This has only a 40dB range, but an extra 20dB of gain can be applied before the tube stage.&nbsp;<br />Having an extra gain boost selectable in this way helps the preamp to run at lower gains while still maintaining a high signal-to-noise ratio.&nbsp;<br />A combination of the input gain and this 20dB 'boost' can be used to drive the tube stage as hard as you feel appropriate.&nbsp;<br />A further 10dB is available via the output gain control, so there's an overall maximum gain of 70dB.<br /><br />Next to the input gain control is the one that governs input impedance, which ranges from 150O to 2.4kO.&nbsp;<br /><br />To keep the lows under control, there's a smooth, 6dB/octave low-cut filter that can be swept from 10Hz to 200Hz.&nbsp;<br /><br />Four illuminated buttons beneath the VU meter are used to select 'normal' or +20dB of gain, phantom power, high or normal 'plate' voltage, and polarity inversion.<br /><br />A further button mounted between the channels selects the M/S decoding matrix, so that an M/S mic pair fed through the unit will produce a standard stereo signal at the output.&nbsp;<br /><br />At the extreme right of the unit is a 'stereo' button that allows the rightmost output-level control to function instead as a stereo balance, while the leftmost output-level control operates as a master stereo level control.<br /><br /><br /> Two-channel valve mic preamp with switchable 48V phantom power and continuously variable input impedance.&nbsp;<br />This model adds A/D conversion for convenient integration with digital systems.<br />The variable impedance can have a significant effect on the sound of the connected microphone; in particular, many dynamic models, including passive ribbons, prefer to see a higher impedance.<br />The unit can be set up for dual-mono, conventional stereo or M/S (Mid/Side) operation.&nbsp;<br />In this last role, channel one is used for the 'Mid' mic and channel two for the 'Sides'.&nbsp;<br />Further tonal variety is offered by the ability to run the 12AX7 valves at low or high anode voltages.<br /><br /><br />It's a solidly built unit, with a stylish front panel. The two large baclit VU meters and chunky knobs give it a glorious retro look.&nbsp;<br />Further LED bar-graph meters, labelled Tube Warmth and set between the VU meters, show the amount of tube drive being used.&nbsp;<br />While the mic inputs and balanced XLR and TRS jack outputs are on the rear panel, a high-impedance instrument input is conveniently positioned on the front panel, this taking precedence over the mic input when connected.&nbsp;<br />A rear-panel button allows the output level to be set to +4dBu or -10dBv, and the meter calibration automatically follows this setting.<br /><br />The mic input is a solid-state design, with a rotary control to set the initial gain. This has only a 40dB range, but an extra 20dB of gain can be applied before the tube stage.&nbsp;<br />Having an extra gain boost selectable in this way helps the preamp to run at lower gains while still maintaining a high signal-to-noise ratio.&nbsp;<br />A combination of the input gain and this 20dB 'boost' can be used to drive the tube stage as hard as you feel appropriate.&nbsp;<br />A further 10dB is available via the output gain control, so there's an overall maximum gain of 70dB.<br /><br />Next to the input gain control is the one that governs input impedance, which ranges from 150O to 2.4kO.&nbsp;<br /><br />To keep the lows under control, there's a smooth, 6dB/octave low-cut filter that can be swept from 10Hz to 200Hz.&nbsp;<br /><br />Four illuminated buttons beneath the VU meter are used to select 'normal' or +20dB of gain, phantom power, high or normal 'plate' voltage, and polarity inversion.<br /><br />A further button mounted between the channels selects the M/S decoding matrix, so that an M/S mic pair fed through the unit will produce a standard stereo signal at the output.&nbsp;<br /><br />At the extreme right of the unit is a 'stereo' button that allows the rightmost output-level control to function instead as a stereo balance, while the leftmost output-level control operates as a master stereo level control.<br /><br /><br /> Two-channel valve mic preamp with switchable 48V phantom power and continuously variable input impedance.&nbsp;<br />This model adds A/D conversion for convenient integration with digital systems.<br />The variable impedance can have a significant effect on the sound of the connected microphone; in particular, many dynamic models, including passive ribbons, prefer to see a higher impedance.<br />The unit can be set up for dual-mono, conventional stereo or M/S (Mid/Side) operation.&nbsp;<br />In this last role, channel one is used for the 'Mid' mic and channel two for the 'Sides'.&nbsp;<br />Further tonal variety is offered by the ability to run the 12AX7 valves at low or high anode voltages.<br /><br /><br />It's a solidly built unit, with a stylish front panel. The two large baclit VU meters and chunky knobs give it a glorious retro look.&nbsp;<br />Further LED bar-graph meters, labelled Tube Warmth and set between the VU meters, show the amount of tube drive being used.&nbsp;<br />While the mic inputs and balanced XLR and TRS jack outputs are on the rear panel, a high-impedance instrument input is conveniently positioned on the front panel, this taking precedence over the mic input when connected.&nbsp;<br />A rear-panel button allows the output level to be set to +4dBu or -10dBv, and the meter calibration automatically follows this setting.<br /><br />The mic input is a solid-state design, with a rotary control to set the initial gain. This has only a 40dB range, but an extra 20dB of gain can be applied before the tube stage.&nbsp;<br />Having an extra gain boost selectable in this way helps the preamp to run at lower gains while still maintaining a high signal-to-noise ratio.&nbsp;<br />A combination of the input gain and this 20dB 'boost' can be used to drive the tube stage as hard as you feel appropriate.&nbsp;<br />A further 10dB is available via the output gain control, so there's an overall maximum gain of 70dB.<br /><br />Next to the input gain control is the one that governs input impedance, which ranges from 150O to 2.4kO.&nbsp;<br /><br />To keep the lows under control, there's a smooth, 6dB/octave low-cut filter that can be swept from 10Hz to 200Hz.&nbsp;<br /><br />Four illuminated buttons beneath the VU meter are used to select 'normal' or +20dB of gain, phantom power, high or normal 'plate' voltage, and polarity inversion.<br /><br />A further button mounted between the channels selects the M/S decoding matrix, so that an M/S mic pair fed through the unit will produce a standard stereo signal at the output.&nbsp;<br /><br />At the extreme right of the unit is a 'stereo' button that allows the rightmost output-level control to function instead as a stereo balance, while the leftmost output-level control operates as a master stereo level control.<br /><br /><br /> Two-channel valve mic preamp with switchable 48V phantom power and continuously variable input impedance.&nbsp;<br />This model adds A/D conversion for convenient integration with digital systems.<br />The variable impedance can have a significant effect on the sound of the connected microphone; in particular, many dynamic models, including passive ribbons, prefer to see a higher impedance.<br />The unit can be set up for dual-mono, conventional stereo or M/S (Mid/Side) operation.&nbsp;<br />In this last role, channel one is used for the 'Mid' mic and channel two for the 'Sides'.&nbsp;<br />Further tonal variety is offered by the ability to run the 12AX7 valves at low or high anode voltages.<br /><br /><br />It's a solidly built unit, with a stylish front panel. The two large baclit VU meters and chunky knobs give it a glorious retro look.&nbsp;<br />Further LED bar-graph meters, labelled Tube Warmth and set between the VU meters, show the amount of tube drive being used.&nbsp;<br />While the mic inputs and balanced XLR and TRS jack outputs are on the rear panel, a high-impedance instrument input is conveniently positioned on the front panel, this taking precedence over the mic input when connected.&nbsp;<br />A rear-panel button allows the output level to be set to +4dBu or -10dBv, and the meter calibration automatically follows this setting.<br /><br />The mic input is a solid-state design, with a rotary control to set the initial gain. This has only a 40dB range, but an extra 20dB of gain can be applied before the tube stage.&nbsp;<br />Having an extra gain boost selectable in this way helps the preamp to run at lower gains while still maintaining a high signal-to-noise ratio.&nbsp;<br />A combination of the input gain and this 20dB 'boost' can be used to drive the tube stage as hard as you feel appropriate.&nbsp;<br />A further 10dB is available via the output gain control, so there's an overall maximum gain of 70dB.<br /><br />Next to the input gain control is the one that governs input impedance, which ranges from 150O to 2.4kO.&nbsp;<br /><br />To keep the lows under control, there's a smooth, 6dB/octave low-cut filter that can be swept from 10Hz to 200Hz.&nbsp;<br /><br />Four illuminated buttons beneath the VU meter are used to select 'normal' or +20dB of gain, phantom power, high or normal 'plate' voltage, and polarity inversion.<br /><br />A further button mounted between the channels selects the M/S decoding matrix, so that an M/S mic pair fed through the unit will produce a standard stereo signal at the output.&nbsp;<br /><br />At the extreme right of the unit is a 'stereo' button that allows the rightmost output-level control to function instead as a stereo balance, while the leftmost output-level control operates as a master stereo level control.<br /><br /><br />
  • Details
Specifications

Analog Section:

Frequency Response 15Hz to 48 kHz (+0, -1dB) @ normal plate voltage
15Hz to 120 kHz (+0, -1dB) @ high plate voltage
Dynamic range: >110dB (“A” weighted)
CMRR: >90dB
THD: <0.005% (typical)
Equivalent Input Noise: -129dBu (XLR, “A” weighted)
Maximum Input Level: +19dBu (cannon)
Maximum Instrument Input: +17dBu
Input Impedance: 150-3000 (Omega) adjustable (XLR)
>800k (Omega) (Instrument)
Maximum Output Level: +27dBu (XLR)
Output Impedance:: < 47 (Omega) (XLR)
Maximum Gain: 75dB
Meter Calibration: 0 VU = +4dBu output (+4dB mode)
0 VU = -10dBV output (-10dB mode)
High Pass Filter: single pole, 10-200 Hz adjustable
Digital Section:

A/D Frequency Response:
@44.1KHz sample rate: 10Hz to 21.25KHz (+0, -1dB)
@88.2KHz sample rate: 10Hz to 42.50KHz (+0, -1dB)
@196KHz sample rate: 10Hz to 81KHz (+0, -1dB)
A/D Dynamic Range: >112dB “A” weighted (typical)
A/D THD: <0.001% @1K (typical)
A/D Input Sensitivity: +12dBu min
A/D Insert Input Impedance: >10k (Omega)
Power Requirements: USA – 105 to 125 VAC / 60 Hz Export units configured for country of destination
Dimensions: (HxWxD in) 3.50 x 19.0 x 8.75
Dimensions: (HxWxD mm) 88 x 482x 222
Weight: (lb/kg) 10.5 / 4.7