Onkyo SL-107 instruction manual Subwoofer effects, Adjustments, Placement, En-7

SL-107_Chi.book Page 7 Tuesday, September 30, 2003 2:43 PM

Subwoofer effects

Adding a subwoofer to your speaker system expands the bandwidth of the bass range. However, if the sub- woofer’s reproduction bandwidth or sound output level is improperly adjusted, the overall performance may decrease, as shown in the graphs below.

When the subwoofer’s reproduction bandwidth is correct

Overall characteristics

Speaker characteristics

Subwoofer characteristics

When the subwoofer’s output level is incorrect

Output level is too high

Output level is too low

Adjustments

Crossover frequency and output level

•Adjust the SL-107 output level and crossover fre- quency to suit your listening room and connected speakers.

•When the unit is connected to an amplifier via the SPEAKER LEVEL INPUT terminals, setting the OUTPUT LEVEL knob near the center position will create a well-balanced sound level on most speakers.

•Be aware that you might set the subwoofer to a high output level because superbass-range sound is less audible than other sound ranges. To obtain well-bal- anced frequency characteristics, set the output level to a slightly lower level than seems optimal. (This will also prevent the input of signals that are too strong.)

Note:

Be careful not to allow the input of excessive power. Input levels that greatly exceed normal situations can damage the SL-107. Also note that switching operations at the amplifier may generate excessive noise that may result in damage. When using switches at the amplifier, first lower the volume to prevent accidental damage.

Placement

When the subwoofer’s reproduction bandwidth is far from the speaker’s bandwidth

Curve is sunken

When the subwoofer’s reproduction bandwidth is close to the speaker’s bandwidth

Curve is raised

The placement of the SL-107 can greatly affect the sound that is produced. In general, a good bass sound can be obtained by installing the subwoofer in a front corner, or at one-third the width of the wall, as shown.

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