Marshall electronic 840 Merkblatt

Thank you for purchasing the MXL 840 Pair of small diaphragm instrument 

microphones. With proper care, these mics will provide many years of 

satisfaction. For best results, please take a few moments to review this 

literature.

Enjoy your microphones!

The MXL 840 has a 22mm capsule and a fixed cardioid pickup pattern.  

Condenser microphones are very sensitive, readily revealing very subtle 

sonic details.  They also tend to pick up sounds outside the pattern more 

than some designs, which can lead to powerful feedback if you are not 

careful.  We strongly advise experimentation with placement and isolation 

requirements with the gain initially set low to avoid equipment (and ear) 

damaging suprises!

The high isolation shockmount may shift during shipping. Simply shift 

the elastic bands to center the microphone in the assembly. Be sure that 

the wire clamp does not rest on the chassis of the mount, as this impairs 

mechanical isolation. Slide the shockmount up the body of the microphone 

and stop in the middle for the most secure hold.

Unpack your MXL 840 Pair of microphones carefully and verify that all of 

the following items are included:

• MXL 840 microphone (Qty. 2)
• Shockmount (Qty. 2)
• microfiber cleaning cloth

If any of these items are missing or damaged, contact the company from 

which you purchased the microphone.

IMPORTANT - This unit requires phantom power at 48 volts, ± 4 volts.

Each unit has been thoroughly checked before shipping, so if you do not 

hear sound, check that the phantom power on your mixer or separate 

power supply is switched on.

These microphones connects to a mixer or preamp via XLR cable (not 

included). The microphone cable can have a profound effect on the sound 

of any microphone. Even the finest microphones will sound poor if the 

interconnect cable allows noise to enter, or causes distortion and loss of 

information. Use only the best microphone cable your budget will allow. We 

recommend Mogami cable for the best results.

Marshall microphones are guaranteed against defects in material and workmanship 

for one year from the date of purchase. Should you encounter any problem with 

this unit, promptly contact the company you purchased it from for assistance. The 

original dated sales receipt will be necessary for any warranty claim. Do not send 

any unit directly to us without prior authorization from our service department. 

Warranty coverage is limited to repair or replacement (at our option) of the 

microphone, and does not cover incidental damages due to use of this unit, nor 

damage caused by accidental misuse of this product.

Dust and foreign material can degrade the performance of a microphone 

over time so always store the unit in its case. For vocals closer than 3", use a 

pop filter or a foam windscreen to avoid getting moisture on the diaphragm 

as this can substantially degrade the microphone’s performance. Store the 

microphone in its original packaging in a cool, dry place along with the 

included packet of silica gel. These steps will help keep the mic in proper 

working order and sounding its best for many years to come.

0

90

270

180

Type

Pressure gradient condenser microphone

Capsule Size

22mm

Frequency Range

30 Hz – 20 kHz 

Polar Pattern

Cardoid

Sensetivity

15mV/Pa 

Impedance

110 Ω 

Equivalent Noise Level

20dB (A weighted IEC 268-4) 

Max SPL for .5% THD

137dB 

S/N Ratio

74dB (Ref. 1Pa A-weighted)  

Power Requirements

Phantom Power 48V ± 4V

Weight

0.2 lbs 

Size

22mm x 134mm (0.87” x 5.28”)

Metal Finish

Shark skin and Silver