JL Audio 300/2 owner manual Crossover Controls Preamp Output Section Speaker Outputs

CROSSOVER CONTROLS		PREAMP OUTPUT SECTION	SPEAKER OUTPUTS
Crossovers are groups of individual electronic filters	2) “Filter Slope” Control: This switch allows	The 300/2 incorporates a flexible preamp output		The 300/2 employs JL AUDIO's exclusive
which allow only certain frequency ranges to pass	you to select from two filter slopes for that	section, so that additional amplifiers can be added to	Regulated, Intelligent Power Supply (R.I.P.S.) design.
through them by attenuating frequencies outside	channel section.	the system.This pre-amp output can be configured	This sophisticated power supply allows the
the selected range.These filters allow the user to	“12dB”: Configures the filter to attenuate	three different ways using the switch labeled	amplifier to produce its optimum power (300
specify what frequency range will be sent to the	frequencies above or below the selected filter	“Output Mode” in the “Preamp Output Section”.	watts) over a wide range of speaker impedances.
each amplifier (or channels) in a system.This, in turn,	frequency at a rate of 12 dB per octave		Unlike conventional amplifiers that require a
allows each speaker system to only reproduce a	(Butterworth alignment).		specific impedance to produce optimum power,
range of frequencies it is well-suited for, resulting in	“24dB”: Configures the filter to attenuate		the R.I.P.S.-equipped 300/2 gives you the freedom
reduced distortion and improved fidelity.	frequencies above or below the selected filter		to use a variety of speaker configurations that
	frequency at a rate of 24 dB per octave (Linkwitz-		achieve final impedances between 1.5 – 4Ω
Amp Filter Section:	Riley alignment).		nominal per channel (without sacrificing power
	Depending on the speaker system and the		output or sound quality).
	vehicle, different filter slopes may be required to			The operation of the R.I.P.S. circuitry is entirely
	produce a smooth transition between the sound of		automatic and adjusts itself every time the amplifier
		1) “Full-Range”: The preamp output delivers
	different speakers in the system. Experiment to find		is turned on according to the lowest impedance
	the slope which best matches the acoustic	the same signal that is connected to the 300/2's	present at the speaker outputs .There are no user
	requirements of the system.The sharper “24dB”	Amplifier Inputs.	controls to configure.The system operates through
	setting will do a better job of protecting small	2) “Low-Pass”: The preamp output delivers	multiple stages of impedance optimization, choosing
	speakers with limited power handling.The shallower	the same signal that is connected to the 300/2's	the stage most appropriate to the actual impedance
	“12dB” octave setting allows the rear speakers to	Amplifier Inputs with Low-Pass filtering applied to	of the speakers you connect to it.
	reproduce more low-frequency content.	it at the “Filter Freq.” and “Filter Slope” selected
1) “Filter Mode” Control: This switch allows you to	3) “Freq. Range” Control: When thrown to	in the “Amplifier Filter” section. This mode can
configure the filter into one of two filter types or	the right, this switch multiplies the cutoff	be useful for feeding a subwoofer amplifier
defeat it completely:	frequency selected by the rotary “Filter Freq.	when the 300/2 is being used to drive the
“Off”: Defeats the filter for that channel section	(Hz)” control by a factor of 10. In the “x1”	main speaker system.
completely, allowing the full range of frequencies	position, the range of the rotary control is	3) “High-Pass”: The preamp output delivers
present at the inputs to feed the amplifier.This is	50 - 500 Hz (as marked). In the “x10”	the same signal that is connected to the 300/2's
useful for systems utilizing outboard crossovers or	position, the range of the rotary control is	Amplifier Inputs with High-Pass filtering applied to
requiring full-range reproduction from the 300/2.	500 Hz - 5 kHz (5000 Hz).	it at the “Filter Freq.” and “Filter Slope” selected
“LP” (Low-Pass): Configures the filter to attenuate	4) “Filter Freq. (Hz)” The filter frequency	in the “Amplifier Filter” section. This mode can
frequencies above the selected filter frequency.	markings surrounding this rotary control are for	be useful for feeding a second satellite amplifier
Useful for connection of subwoofer(s) to the 300/2.	reference purposes and are generally accurate to	when the 300/2 is being used to drive the main		!	IMPORTANT
					If you connect a load higher than 4Ω nominal
“HP” (High-Pass): Configures the filter to attenuate	within 1/3 octave or better. If you would like to	speaker system.
frequencies below the selected filter frequency.	select the filter cutoff frequency with a higher level		per channel in stereo mode (or 8Ω in bridged
Useful for connection of component speakers to	of precision, consult the chart in Appendix A	NOTE: The signal level of the “Preamp Output” is	mode), power will drop by half with every
the 300/2 in a bi-amplified system.	(page 12) of this manual.	affected by the setting of the “Input Voltage Range”	doubling of impedance above 4Ω stereo / 8Ω
		switch of the amplifier. See the “Input Voltage	mono. If you connect a load lower than 1.5Ω
		Range” section (page 7) for details on “Input	nominal per channel in stereo mode (or 3Ω in
		Voltage” settings.The preamp output level is not	bridged mode, the amplifier protection circuitry
		affected by the “Input Sens.” rotary control.	activates a “safe” mode which reduces amplifier
			power to protect the circuitry from failure (the
			yellow “Low Ω” LED lights to indicate that this
			has happened). See page 10 for details.
				!	IMPORTANT
				Speaker loads below 1.5Ω nominal per channel
			in stereo or 3Ω nominal in bridged mode are not
			recommended and may cause the amplifier output
			to distort excessively.

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