General Description

The MV9 dB dynamic microphone features a smooth, flat and wide-range frequency response, making it suitable for content creation, speech, music and more. The integrated active preamplifier delivers +28 dB of low-noise, flat, and clear gain while maintaining a frequency response that consistently provides a clean, classic sound. The MV9 dB's built-in preamplifier offers superb, pristine sound quality without requiring an embedded preamp. Rear-panel switches on the MV9 dB allow customisation of the frequency response and enable adjustment or bypassing of the preamplifier.

Powering the MV9 dB Preamplifier

Important Note: The MV9 dB requires +48 V phantom power to operate with the preamplifier enabled. Without phantom power, it operates in bypass mode.
To transmit audio directly to a computer, use an audio interface with XLR inputs that provides +48 V phantom power, and ensure phantom power is switched on.
When connecting to a mixer, use only equalised, microphone-level inputs that provide phantom power. Engage phantom power for the channel to which the MV9 dB is connected.
Depending on your interface or mixer, phantom power may be enabled via a switch, button, or control software. Consult your interface or mixer's user guide for instructions on enabling phantom power.

Preamplifier Best Practices

The MV9 dB features a built-in active preamplifier delivering up to +28 dB of low-noise, low-distortion gain for optimised audio performance.

First adjust the gain level on the MV9 dB, then adjust the level on the interface or mixer. This approach maximises the signal-to-noise ratio, producing a purer, clearer sound.

For podcasting or quiet voice applications, you may find the +28 dB setting more suitable, whilst louder presenters or singers may only require the +18 dB setting. For instrumental applications, you may find that +18 dB or the bypass setting achieves the ideal input level.

Using Variable Impedance Mic Preamplifiers

Select the highest available impedance setting on the external preamp when using the built-in preamp.

If you are using a low impedance setting to change the tonality for creative purposes, bypass the MV9 dB's built-in preamp. Keeping the MV9 dB preamp engaged with a low-impedance setting will not yield the same changes in tone.

Microphone Placement

Speak directly into the mic, 1 to 6 inches (2.54 to 15 cm) away to block off-axis noise. For a warmer bass response, move closer to the microphone. For less bass, move the microphone away from you.

Adjust Back Panel Switches

When looking directly at the back of the microphone, the switches are arranged as follows:

① Bass Rolloff Switch To reduce the bass, push the top-left switch down. This can help lower background hum from A/C, HVAC, or traffic.

② Presence Boost For a brighter sound in mid-range frequencies, push the top-right switch up. This can help improve vocal clarity.

③ Bypass Switch Push the bottom-left switch to the left to bypass the preamp and achieve the classic sound.

④ Preamp Switch To adjust the gain on the built-in preamp, push the bottom-right switch to the left for +18 dB and to the right for +28 dB.

Switching Microphone Orientation

The MV9 dB can be mounted on a boom arm or a stand. The default setup for the MV9 dB is for a boom mount. To keep the rear panel facing upright when mounted on a stand, reconfigure the mounting assembly.

To set up the MV9 dB for a microphone stand:

1. Remove tightening nuts on the sides.
2. Remove the fitted washers, the lock washers, the outer brass washers, and the brass sleeves.
3. Slide the bracket off the microphone. Be careful not to lose the washers still on the microphone.
4. Flip and rotate the bracket. Slide it back onto the microphone's bolts above the brass and plastic washers. Once the bracket is in position, the XLR connector should face towards the rear of the microphone.
5. Replace the brass sleeves. Be sure they are seated properly within the inner washers.
6. Replace the outer brass washers, the lock washers, and the fitted washers.
7. Replace the tightening nuts and tighten the microphone at the desired angle.

Note: If the tightening nuts do not hold the microphone in place, you may need to re-position the brass sleeves and the washers.

① Tightening nut

② Fitted washer

③ Lock washer

④ Brass washers

⑤ Brass sleeve

⑥ Mounting bracket

⑦ Plastic washer

⑧ Response switches

⑨ Windscreen

Install or Remove the Stand Adapter

To mount the microphone on a 3/8 in. stand, insert the included brass stand adapter and tighten it with a coin or screwdriver.

Important: Make sure that the slots on the adapter face outward.

Specifications

Type

Dynamic (moving coil)

Frequency Response

50 to 20,000 Hz

Polar Pattern

Cardioid

Output Impedance

Preamp engaged	27 Ω
Bypass mode	150 Ω

Recommended Load

>1k Ω

Sensitivity

Flat response bypass mode	-59 dBV/Pa[1] (1.12 mV)
Flat response +18 preamp engaged	-41 dBV/Pa[1] (8.91 mV)
Flat response +28 preamp engaged	-31 dBV/Pa[1] (28.2 mV)

Hum Pickup

(typical, at 60 Hz, equivalent SPL/mOe)

11 dB

Preamplifier Equivalent Input Noise

(A-weighted, typical)

-130 dBV

Polarity

Positive pressure on diaphragm produces positive voltage on pin 2 with respect to pin 3

Power Requirements

(with preamp engaged)

48 V DC [2] phantom power (IEC-61938) 4.5 mA, maximum

Weight

0.837 kg (1.875 lbs)

Housing

Black enamel aluminum and steel case with black foam windscreen

[1] 1 Pa=94 dB SPL

[2]All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity.

Accessories