Acoustic Fine Tuning, Adjusting the Tweeter

1.Stand halfway between the speakers.

2.Play some music with the amplifier or radio set to Mono.

3.Listen to the richness of the bass and the loudness of the sound.

4.Turn off the amplifier and reverse the connections on one amplifier channel only.

5.Repeat the listening test with the same volume control setting. When the sound has a richer bass and is slightly louder, the speakers are working together or “in-phase.”

ACOUSTIC FINE TUNING

Each HDLCR speaker features separate, baffle-mounted TREBLE CUT and BASS CUT controls for acoustic fine-tuning after installation, as shown in Figure 18.

•If a HDLCR is placed near a boundary, set its BASS CUT switch to – 3 dB to lower the bass response.

•If a HDLCR is placed in a room with highly reflective surfaces like glass or tile, set its TREBLE CUT switch to – 3 dB to lower the high-frequency response.

ADJUSTING THE TWEETER

Figure 18. The HDLCR’s TREBLE and BASS CUT switches.

The HDLCR tweeter is housed in a precision adjustment mechanism which enables precise aiming of the directional high frequencies to provide optimum performance. To adjust the tweeter:

1.Carefully grasp the tweeter housing by placing your thumb and forefinger in the indentations provided.

2.Rotate the tweeter housing either clockwise or coun- ter-clockwise as required. The mechanism is indexed at equal intervals so that speakers in a pair can be adjusted equally. Simply count the number of “clicks” as the first tweeter is adjusted. Repeat the process for the second speaker, rotating the tweeter the same number of “clicks” in the opposite direction, as shown in Figure 19.

NILES AUDIO CORPORATION – 1-800-BUY-HIFI

Figure 19. Rotating the HDLCR’s tweeter.

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