Velodyne Acoustics VA-1250X owner manual Line-level connection

A bypass switch is also provided if you wish to use an external crossover. If you are not using an external crossover, we recom- mend that you use the one provided within the unit for optimum performance.

Phase adjustment

This control allows you the ability to compensate for having the subwoofer in a different location than the main speakers. Ideally, you will have the sound from the subwoofer reach the listening position the same time as the sound from the main speakers. However, if the distance from the listening position to the subwoofer and the distance from listening position to the main speakers differs, the sound from each will reach your ears at a different time.

This control allows the signal to be delayed up to 180 degrees so the output of the subwoofer will blend in to that of your main speakers without any cancellation.

Video/Audio switch

Many listeners prefer an "emphasized" low end on movie soundtracks. This switch sets the VA-1250X for an additional 3dB of output when in video mode.

Auto turn on function

With this function in the "auto" position, your subwoofer can be safely left with the main power switch on continuously. The sub- woofer will turn itself on automatically when an audio signal is present. If no signal is present for approximately 15 minutes, the unit will switch to standby mode. While in standby mode, your subwoofer will draw very minimal power. This function can be disabled by leaving the switch in the "on" position.

High pass crossover switch

This switch selects the frequency for the high pass crossover. This crossover is functional on both line and speaker-level outputs. Smaller speakers with limited low frequency output may prefer the higher 100Hz setting which will reduce the low frequencies sent to them. Larger speakers with greater low frequency output may be able to handle the 80Hz. setting without strain.

Power switch

The master power switch is located on the right half of the unit. This rocker style switch is the main on/off for the unit. This switch should be set to position 1 for on (up), 0 for off (down).

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Detachable power cord (available on some versions) Allows for easy replacement should the original be damaged.

Line-level connection

Figure 1 shows connection to a pre-amplifier's main outputs and returning them to your amplifier inputs.

When installed in this fashion, your satellite speakers will be crossed over at 80/100Hz which removes the lower bass from your amplifier and speakers, enabling them to do a better job reproduc- ing high frequencies. By utilizing this method, you will have a bi- amplified system, gaining improved power and headroom for your system.

A word about subwoofer outputs

The Velodyne subwoofer is designed to operate using the full range audio signal for input when using the built-in crossover. Some surround sound processors/receivers, including the Dolby AC3 system with there .1 channel outputs, have a "subwoofer out" jack that is already crossed over and designed to be used with a conventional amplifier and speaker. Combining both an external crossover and the one internal to the subwoofer may result in low

Figure 1: Installation using line-level (line in) inputs

								POWER
	SERIES
	Audio/Video Subwoofer System
VOLUME			PHASE		LOW-PASS
					CROSSOVER
5			90		80HZ				WARNING: TO REDUCE THE RISK OF
									FIRE OR ELECTRIC SHOCK DO NOT EXPOSE
4	6				90HZ	70HZ			THIS APPLIANCE TO RAIN OR MOISTURE
3	7	60		120	100HZ				CAUTION!
2		8				60HZ
		30		150	110HZ	50HZ
1	9								RISK OF ELECTRIC SHOCK
POWER 0	10		0	180	120HZ	40HZ			DO NOT OPEN
						NORMAL/BYPASS			AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR
	AUTO / ON			VIDEO/AUDIO
						LOWPASS		MADE IN USA
						CROSSOVER
		H I G H PA S S 1 0 0				80		117 V ~
								60 Hz
								3 A	Serial # Label
					IN
OUT		RIGHT	IN			OUT	LEFT	IN
									Velodyne Acoustics, Inc.
									San Jose, CA 95112
					OUT

PRE-AMP		AMPLIFIER
MAIN OUTPUTS	MAIN	INPUTS	MAIN OUTPUTS
RIGHT LEFT	RIGHT	LEFT	RIGHT	LEFT
	23456789TO SATELLITE SPEAKERS			☞