Boss Audio Systems MR752C User manual

0321

MR652C 6.5” (165mm) 2-Way Component Marine Loudspeakers
MR752C 7.5” (191mm) 2-Way Component Marine Loudspeakers
PAGE 2
Tweeter Type
Max Power (watts)
Efficiency (1 W/1 M)
Frequency Response
Min. Mounting Depth Allowing
Clearance in (mm)
Impedance
Sealed Enclosure Volume (cu.ft)
Ported Enclosure Volume (cu.ft)
Ported diameter in (mm)
Port length in (mm)
MR652C
1” PEI Dome
350
90
60-20kHz
27/16” (62mm)
4 ohm
0.43
0.9
1” (25mm)
2” (50mm)
1” PEI Dome
400
92
40-20kHz
211/16” (68mm)
4 ohm
0.71
1.25
1-3/16” (30mm)
2-3/8” (60mm)
MR752C
PAGE 1
In the above example we showed that one possible sealed cabinet size
for MR652C is approx. 8” x 10” x 13”. We can see that if a 13” deep
enclosure cannot be accommodated in your boat, it will be necessary to
increase the height, width or both to come out with an enclosure of
acceptable size with the appropriate interior volume.
Important considerations when building an enclosure.
Be sure that the cabinet is air-tight. Joints should be glued and caulked
on the interior of the joints.
For marine cabinets which may be exposed to moisture, be sure to use an
appropriate marine varnish to seal the surface of the MDF well.
Congratulations on your purchase of a Marine Component
Speaker System.
What is included?
Specifications
Thank you for making your choice for marine audio
entertainment!
It has been engineered to bring you the highest level of performance.
Its quality will afford you years of listening pleasure.
Before you begin installation please check that your system contains
the following contents:
• (2) Marine 2-Way Speakers
• (2) 13.12ft (4M) Speaker Cables
• (2) 0.49ft (0.15M) Red Wires
• (2) 0.49ft (0.15M) Black Wires
• (2) Surface Mount Plastic Housings for Tweeters
• (1) Stainless Steel Screws Bag
Calculating Required Enclosure Volume
These loudspeakers will perform best if they are installed in a sealed or a
ported enclosure with the appropriate interior volume. Please refer to the
specifications table for the suggested volume for your speaker and
application.
These volumes are provided in the specifications table are in cubic feet.
In order to design your enclosure, you will first need to convert this data
to cubic inches. To convert cubic feet to cubic inches, simply multiply by
1728:
Calculating Enclosure Dimensions
For example:
1. You want an MR652C sealed enclosure with exterior dimensions of
8” W x 10” H.
2. Subtract the cabinet material thickness (3/4” MDF x2) from the
exterior width and height. This yields the interior width as 6.5"
and height as 8.5".
3. Multiply (interior width) x (interior height): 6.5” x 8.5” = 55.25”.
4. Divide the recommended interior volume (743 cu. in.) by this number:
743 ÷ 55.25 = 13.45”. This reveals the interior depth required.
5. Add 1-1/2” to this dimension to calculate exterior depth:
13.45” + 1.5” = 14.95”.
Calculating the exterior cabinet dimensions requires that you first
estimate height and width of the enclosure based on the available space
in your boat. You then work with this estimate to determine the depth of
the cabinet.
Model
MR652C
MR752C
Sealed volume
743 cu in.
1227 cu in.
Ported volume
1555 cu in.
2160 cu in.

PAGE 4PAGE 3
Option B – Install As A 2-Way Component Speaker. Tweeter
Removed and Installed Onto A Surface.
Installation Options
Option A - Install As A 2-Way Coaxial Speaker. This Is How
They Come Packaged, Ready to Mount.
STEP1.
With the speaker facing down, gently pull the red and black tweeter
wires (red arrows below) from the bottom of the speaker. Remove
the wires from the groove.
STEP2.
The speaker grill is removable. Pull the grill up slowly then the red and
black tweeter wires will be pulled out with rubber plugs from the speaker
unit. Put the grill upside down and unscrew the three screws around the
tweeter cover. Pull the wires out of the grooves then the tweeter can be
removed completely.

STEP3.
Place the grill back on to the speaker and fasten with the provided screws.
STEP4.
As shown below, surface mount the tweeter.
PAGE 5 PAGE 6
Speaker Dimensions
6.13” (Ø155.8)
0.169” (Ø4.3)
5.20” (Ø132)
2.44” (62)
0.83” (21)
6.93” (Ø176)
6.66” (Ø169.2)
0.173” (Ø4.4)
6.22” (Ø158)
2.68” (68)0.84” (21.3)
7.36” (Ø187)
MR652C
MR752C