Specifications
MR652C MR752C
Tweeter Type 1” PEI Dome 1” PEI Dome
Max Power (watts) 350 400
Efficiency (1 W/1 M) 90 92
Frequency Response 60-20kHz 40-20kHz
Min. Mounting Depth Allowing Clearance in (mm) 27/16” (62mm) 211/16” (68mm)
Impedance 4 ohm 4 ohm
Sealed Enclosure Volume (cu.ft) 0.43 0.71
Ported Enclosure Volume (cu.ft) 0.9 1.25
Ported diameter in (mm) 2” (50mm) 2-3/8” (60mm)
Port length in (mm) 1” (25mm) 1-3/16” (30mm)
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 Sealed volume
MR652C 743 cu in. 743 cu in.
MR752C 1227 cu in. 1227 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.
Installation Options
Option A – Install As A 2-Way Coaxial Speaker. This Is How They Come Packaged, Ready to Mount.
Option B Install As A 2-Way Component Speaker. Tweeter Removed and Installed Onto A
Surface.
STEP1.
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