NHT M-20 owner manual Boundary Control, Position Control

BOUNDARY CONTROL:

Reflective boundaries, such as floors, walls, even table tops, reinforce a speaker’s low frequency output. Conversely, placing speakers out into a room decreases bass response. The greatest low frequency output is with the BOUNDARY control in the “0” position, which assumes no significant boundary reinforcement is present. Each control step attenuates low frequencies by 1.5 dB (at 50 Hz), with rapidly decreasing effect above 300 Hz. Refer to the diagram in Fig. 6 for information on setting the control appropriately.

Quarter Space Quarter/Half Space Half Space Half/Whole Space Whole Space

1

20

BOUNDARY

	1		1		1
2	0	2	0	2	0

BOUNDARY BOUNDARY BOUNDARY

Fig. 6. Boundary Control Settings Diagram

1

20

BOUNDARY

POSITION CONTROL:

Near field monitoring reduces the effect of room acoustics on the signal, and provides greater sonic detail. Mid and far field monitoring conversely reveal aspects of room ambience and are more representative of end use. With increased listening distance, a speaker’s upper frequency power response attenuates due to room influences and air absorption. The M-20 may be adjusted to compensate for this change, and provide flat response at various listening distances. Setting the control in the “FF” (far-field) position gives the maximum high frequency output. Each step counter clockwise (moving toward the near-field position) attenuates the 20 kHz by an additional .75 dB with the effect rolling off at 3 kHz. See Fig. 7 for appropriate POSITION control settings for various listening distances.

Listener Distance

	0’	1 m	1.5m	2m	2.5m	3m
M-20					Far-Field
				Mid-field
Monitor
		Near field

MF

NFFF

MF

NFFF

MF

NFFF

MF

NFFF

MF

NFFF

POSITION

POSITION

POSITION

POSITION

POSITION

Fig. 7. Position Control Settings Diagram