Diamond Audio Technology D6 300.4 Owner's Manual - Page 7

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Diamond Audio Technology D6 300.4 Owner's Manual

D6 300.4/600.4

Crossovers (cont.)

All crossover controls are mounted on the signal side of the amplifier. The D6300.4/600.4

crossovers are continuously variable, lowpass from 50Hz to 5kHz, highpass from 15Hz to

1.5kHz or 1.5kHz to 15kHz using multiplier button. Each pair of channels has an

individual network that can be configured to Highpass, Lowpass, Bandpass or All-pass

by simple switch selection. When switched off, they are completely out of the audio path.

The Ch 3/4 crossover also features a mono/stereo switch that when pushed in to mono

will series the two crossovers to a fourth-order 24dB/octave filter for subwoofer systems.

Gain

This control matches the output voltage of the source unit or processor to the amplifier

inputs. Rotating this control to the "MIN" mark (counterclockwise) configures the D6

amplifier to accept input voltages as high as 5V RMS. This control should be set as low

as possible. The basic procedure for setting input gains is as follows:

1. Adjust all amplifier gain controls to just above the minimum setting (fully

counterclockwise).

2. Using the highest quality source (usually CD) play some music and slowly turn up the

source unit until you can hear distortion. Now turn down the volume until the distortion

stops. This is your maximum source unit level.

3. Turn up the amplifier gain until audible distortion starts. Turn down the gain to the

point JUST BELOW the start of the distortion.

4. Repeat step 3 for all amplifiers in your system.

Aux. Output Select

Leaving this button "OUT" selects the Aux. outputs to use the crossover settings on the

amplifier. Pushing this button "IN" bypasses the crossover and selects the Aux. outputs

to run full range.

Ch 3/4 Input Select

Pushing this button "IN" selects the 2 channel mode, meaning that channels 3/4 use the

channel 1/2 inputs. Leaving this button "OUT" uses the channel 3/4 input in 4 channel

mode.

D6 300.4/600.4

Gain Bypass Select

Pushing this button "IN" bypasses the gain stage on the amplifier. This is used in

systems with a pre-amp section before the amplifier or to slave the amp to a master

amplifier. Leaving this button "OUT" is the default and uses the amplifiers gains as a

normal input level match.

Ch 3/4 Mono Select

Pushing this button "IN" combines the input signal to create a mono signal of channels

3/4 for use with subwoofer systems. Leaving the button "OUT" defaults the amp to

normal stereo mode.

Highpass Freq.

Turning this control sets the Highpass crossover point from 15 Hz (fully counterclockwise)

to 1.5 kHz (fully clockwise). This can be used as a subsonic filter if needed.

Highpass On/Off

Pushing this button "IN" engages the Highpass filter. Pushing this button "OUT" will

bypass the filter.

Highpass Multiplier Select

Pushing this button "IN" multiplies the highpass crossover frequencies, 1.5 kHz to 15

kHz. Leaving the button "OUT" uses the highpass filter normally. (see highpass

frequency section above for frequency points)

Lowpass Freq.

Turning this control sets the Lowpass crossover point from 50Hz (fully counterclockwise)

to 5kHz (fully clockwise).

Lowpass On/Off

Pushing this button "IN" engages the Lowpass filter. Pushing this button "OUT" will

bypass the filter.