MEMPHIS MOJO Mini Subwoofers User Manual
- June 10, 2024
- MEMPHIS
Table of Contents
MEMPHIS MOJO Mini Subwoofers
Product Information
The MOJO Mini is a high-performance subwoofer designed and manufactured by Memphis Car Audio. It is a part of the 2019 MOJOMini series which has been in production since 1965. The subwoofer comes in four different models: MJM622, MJM644, MJM822, and MJM844. The Thiele Small Parameters of the subwoofers include ResonantFrequency (fs), Mechanical Q (Qms), Electrical Q (Qes), Total Q(Qts), Sensitivity (dB), Xmax Linear (in.), Displacement (cf.), Airvolume of suspension (Vas) cf., Moving Mass (Mms) g, SuspensionCompliance (Cms) mmN, Effective piston area (Sd) SqCm, and MotorStrength (Bl) TM. The Voice Coil and Magnet specifications includeImpedance Series and parallel (ohms), Voice coil diameter (in.), RMS Power and Peak Power (Watts), Magnet weight (oz), and Magnetdiameter (in.). The Physical dimensions include Mounting depth(in.), Cutout Diameter (in.), and Frame Outside Diameter (in.). The Enclosure Recommendations include Single sub-sealed, Dual subsSealed, Single sub vented, and Dual sub vented with port dimensions and Tuning frequency.
Product Usage Instructions
Before installing the MOJO Mini subwoofer, make sure to read the user manual carefully and follow the instructions provided. Choose an appropriate enclosure that meets the recommended specifications for the selected model. Install the subwoofer in the enclosure following the mounting depth and cutout diameter specifications. Connect the voice coil to the amplifier using an appropriate wiring kit. Set the amplifier settings according to the recommended RMS power and peak power specifications. Adjust the tuning frequency of the enclosure to achieve optimal performance. Test the subwoofer with various music genres and adjust the amplifier settings accordingly to get the desired sound output. Do not exceed the recommended RMS power and peak power specifications as this may cause damage to the subwoofer.
2019 MOJO MINI
| U N I TS| MJM622| MJM644| MJM822|
MJM844
T H I E L E SMALL
PARAMETERS| | | | |
Resonant Frequency (fs)| Hz| 48.7| 51.3| 44.2| 38.4
Mechanical Q (Qms)| | 6.06| 6.13| 5.9| 5.61
Electrical Q (Qes)| | 0.585| 0.616| 0.6| 0.462
Total Q (Qts)| | 0.534| 0.56| 0.542| 0.427
Sensitivity| dB| 80.63| 80.8| 80.86| 81.22
Xmax Linear| in.| 0.31| 0.31| 0.49| 0.49
Displacement| cf.| 0.02| 0.02| 0.03| 0.03
The air volume of suspension (Vas)| cf.| 0.13| 0.12| 0.239| 0.184
Moving Mass (Mms)| g| 79.37| 76.4| 159.9| 155.1
Suspension Compliance (Cms)| mmN| 0.135| 0.126| 0.108| 0.083
Effective piston area (Sd)| SqCm| 138.93| 138.93| 211.24| 211.24
Motor Strength (Bl)| TM| 6.5| 8.12| 11.16| 9.14
VOICE COIL AND MAGNET| | | | |
Impedance Series| ohms| 4| 8| 4| 8
Impedance parallel| ohms| 1| 2| 1| 2
Voice coil diameter| in.| 1.5| 1.5| 2| 2
RMS Power| Watts| 700| 700| 900| 900
Peak Power| Watts| 1400| 1400| 1800| 1800
Magnet weight| oz| 80| 80| 105| 105
Magnet diameter| in.| 5.28| 5.28| 6.14| 6.14
PHYSICAL DIMENSIONS| | | | |
Mounting depth| in.| 5.00| 5.00| 5.75| 5.75
Cutout Diameter| in.| 5.95| 5.95| 7.32| 7.32
Frame Outside Diameter| in.| 7.05| 7.05| 8.66| 8.66
ENCLOSURE RECOMMENDATIONS| | | | |
Single sub sealed| cf.| 0.5| 0.5| 0.6| 0.6
Dual subs Sealed| cf.| 1| 1| 1.2| 1.2
Single sub vented| cf.| 0.85| 0.85| 1| 1
Port dimensions| | 3″ diameter x 12.5″| 3″ diameter x 12.5″| 3.5″
diameter x 16″| 3.5″ diameter x 16″
Tuning frequency| hz| 40| 40| 39| 39
Dual sub vented| cf.| 1.6| 1.6| 2| 2
Port dimensions| | 4″ diameter x 11″| 4″ diameter x 11″| 4″ diameter x
9″| 4″ diameter x 9″
Tuning frequency| cf.| 40| 40| 38| 38
INSTALLATION INSTRUCTIONS
