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page 13powered subwoofers
front Left and Right channel speaker outputs (do not use the Center channel speaker output).
VERY IMPORTANT: When the Subwoofer is connected to the Left and Right amplifier outputs
(this means using speaker wires), and the controller is in Pro-Logic mode, the Center channel WIDE/
NORMAL switch MUST be set to the NORMAL mode. If the switch is set to the WIDE mode, the bass
content of the Center channel will not be fed to the Subwoofer, and a significant amount of the bass
in the material you are listening to will be lost.
11. SPECIAL INSTALLATION NOTES
MX-300, MX-200, MX-125 Mk II, MX-105:
An enclosed hardware kit contains four black metal spikes, threaded at one end and tapering to
a sharp point at the other. Depending on their orientation, they can be used either as spikes or rubber
feet. Do not use the spiked feet on hardwood or tile floors. They can damage the floor surface.
By mounting these spikes into the threaded inserts mounted in the bottom of the Subwoofer, you
can elevate the Subwoofer, and on carpet, couple it more tightly to that floor. On hardwood, tile, or
concrete, the spikes should be inverted, with the point mounted facing into the cabinet. One of the black
rubber feet provided should then be pressed over the exposed flat end of the foot.
The threaded inserts are found in the four corners of the cabinet's bottom. The MX-300 has a fifth
insert, which allows you to use three of the five in a triangular pattern. The inserts are 1/4 - 20, that
is, 1/4 inch in diameter and 20 threads per inch. This is compatible with the most spikes, "cones," "tip-
toes," etc. offered by manufacturers of specialized speaker feet.
To properly secure the feet to the cabinet, you must use the provided washer and jamb nut on the
threaded portion of the foot. The washer goes first, with the nut over it, holding the washer securely
in place. This prevents damage to the spike and the threaded insert in case something moves the
cabinet sideways.
MX-200, MX-145, MX-125 Mk II, MX-105, MX-70B:
Because your M&K MX-series Subwoofer uses an inverted driver that fires down into the floor, it
loads differently to the room than a conventional speaker or forward-firing Subwoofer. This means that
you may want to experiment a bit more with its placement and setup to get optimum sound quality.
1. Because of its downward-firing driver, your MX Subwoofer may be more susceptible to
producing a boomy sound if it is located in a corner. Always try the subwoofer first in a corner.
If it sounds boomy, move it a few feet out of the corner.
2. While your Subwoofer performs perfectly well directly on the floor, the distortion cancellation
of its push-pull design and its frequency response are best when the Subwoofer is slightly
elevated. We therefore recommend that you use the enclosed feet to raise the subwoofer off
the floor.
3. Read Section 6 (page 11), Use of the LOW PASS FILTER Control, carefully. The setting of this
control is more critical with your MX model Subwoofer. With these models it is more likely that you will
find the optimum setting to be slightly below the 85 Hz recommended for other models.