MS-FR4021
Titanium Dome
120
MS-FR6021
Titanium Dome
200
MS-FR7021
Titanium Dome
260
Tweeter Type
Max Power (watts)
Efficiency (1W/1M)
87db
90db
91db
Frequency Response 90 – 22kHz
70 – 22kHz
60 – 22kHz
Min. Mounting
Depth Allowing
54mm (2-1/8”)
4 ohms
71.5mm (2-13/16”)
4 ohms
78mm (3-1/16”)
4 ohms
Clearance (mm/in)
Impedance
MS-FR4021
MS-FR6021
0.43
MS-FR7021
Sealed Enclosure Volume (cu.ft)
Sealed Enclosure Volume (litres)
Ported Enclosure Volume (cu.ft)
Ported Enclosure Volume (litres)
Port diameter (mm/in)
0.07
0.71
2
12
20
.34
0.9
1.25
9.5
26
36
50mm (2”)
88mm (3 7/16”)
50mm (2”)
25mm (1”)
60mm (2 7/16”)
30mm (1 1/8”)
Port length (mm/in)
Problem
No sound
Solution
Check all connections from the source unit and
amplifier to the speaker terminals are correctly
connected
Check the connections from the source unit/amplifier
to the speaker. Ensure the positive wire from the
source is connected to the positive of the speaker.
System lacks in bass
Ensure the speakers are mounted firmly to the
mounting surface
Check polarity
System lacks in high frequencies
Distorted sound
Check the bass / treble control settings
on the source unit
Check all wiring
Check that it is not the surrounding panels of the
craft rattling. Check connections from the source to
the speaker.
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