Soundstream Technologies Class A 10.0 LSE.Q THEORY AND USE Class A, Airbass Accessory Option

0 -5-10-15-20-25

LSE.Q THEORY AND USE (Class A 10.0)

	LSE.Q is a unique subwoofer control circuit
	included	with	the	SOUNDSTREAM
	REFERENCE Class A 10.0 amplifier.				It is
	capable of removing subsonic energy in program
	material. The circuit consists of two controls.
	One adjusts the frequency of operation and the
	other adjusts the range of boost. With both
FIG. 1 LSE.Q	controls adjusted		fully counter-clockwise, no
	boost is	applied	and the	amplifier is	flat in

response down to 30 Hz.

The frequency control (Hz) adjusts the starting point of the subsonic

filter. This	high pass filter can be			10	Q=2.8
adjusted from 30		Hz	up to a	5
maximum of 60 Hz. This control				0
				-5
is useful for setting the lowest dB -10						Q=0.707
frequency that your subwoofer will				-15
see. (See figure 1)				-20
The Q control adjusts the				-25
				-3010	Frequency (Hz)	50	100	200
amount of boost applied at the set					FIG. 2 Variable “Q”
frequency.	This	is	adjustable
from .707	(flat) to	2.8 (+9 dB).		10
(See figure 2)				5

When the Q is set to .707 dB (Butterworth), LSE.Q acts as a sub-sonic filter only. (See figure 3)

The simple	act	of removing the -30
			10	Frequency (Hz)	50	100	200
signal below the vented tuning				FIG. 3 Variable High Pass
frequency	can	improve system

output by as much as 3 dB. With Q values greater than .707, boost is

10				added to	the sub-sonic filter. (see
				figure 4)
5
0				Application
-5
dB				Woofers in vented enclosures have
-10
-15				good power handling characteristics
-20
				above the tuning frequency, but
-25
-3010	Frequency (Hz)	50	100	200 below the tuning frequency, power
	FIG. 4 Variable “Q”			handling	drops off considerably.

most amplifiers in the Class A 5.0, and over twelve times in the Class A 10.0! More drive current maintains the amplifiers' performance into low impedance loads.

∙Drive DelayTM Muted Turn-on/off Circuit - A unique circuit which completely eliminates any amplifier-relatedturn-on/off noises.

∙Flexible Dual Input Level Sensitivity accepts 2 voltage ranges; from 200 mV to 2.0 V and from 500 mV to 5.0 V, permitting maximum output from the amplifier with virtually any source unit.

∙Differential Balanced Input Design for added immunity to noise caused by component and vehicle electrical system interaction when using Unbalanced RCA inputs.

∙True Balanced Input for professional-quality performance and noise cancellation. The 6-pin din plug carries (+) and (-) Signal information for Left and Right channels, audio ground, and ±15 Vdc to operate the Soundstream BLT Balanced Line Transmitter.

AIRBASS™ ACCESSORY OPTION

Soundstream's newAIRBASS™ feature can be added to the REFERENCE Class A amplifiers. This feature allows wireless RF remote control level adjustment of the amplifier.

NOTE: The AIRBASS™ accessory is intended to be used only while the REFERENCE Class A amplifiers are driving subwoofers. When the AIRBASS™ accessory is added to a REFERENCE Class A amplifier, it automatically configures the amplifier into Bridged Mono mode. (The Coherent Stereo / Mixed Mono / Bridged Mono switch is bypassed.) Therefore, when using AIRBASS™, follow the Bridged Mono input and output wiring

Installing AIRBASS™ involves removing the bottom plate of the amplifier, adding the AIRBASS™ circuit board, and flipping a switch. The switch is labeled on the amplifier's main circuit board. DO NOT set theAIRBASS™ switch to the "IN" position unless the AIRBASS™ module has been added. DO NOT move the AIRBASS™ switch while the amplifier is "ON". Doing so may damage your speakers. (Please refer to the AIRBASS™ owner's / installation manual for more details.)

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