Boss MR752C, MR652C User Manual

0321

MR652C 6.5” (165mm) 2-Way Component Marine Loudspeakers
MR752C 7.5” (191mm) 2-Way Component Marine Loudspeakers

Congratulations on your purchase of a Marine Component
Speaker System.

It has been engineered to bring you the highest level of performance.
Its quality will afford you years of listening pleasure.

Thank you for making your choice for marine audio
entertainment!

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:

Model

Sealed volume

Ported volume

What is included?

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

Specifications

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

7/16” (62mm)

2

4 ohm

0.43

0.9

2” (50mm)

1” (25mm)

MR752C

1” PEI Dome

400

40-20kHz

11/16” (68mm)

2

4 ohm

0.71

1.25

2-3/8” (60mm)

1-3/16” (30mm)

92

MR652C

MR752C

743 cu in.

1227 cu in.

1555 cu in.

2160 cu in.

Calculating Enclosure Dimensions
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.

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”.
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.

PAGE 1

PAGE 2