JL Audio 500/1v2 owner manual ADVANCED Bass Control Section, Subwoofer Output

3) “Out Filter”: The preamp output is	ADVANCED Bass Control Section								2) Parametric Bass Equalizer: The parametric	Subwoofer Output
filtered by a fully variable, active filter	The 500/1v2 includes a versatile bass									ensing
incorporated into the output section	processing section consisting of two								equalizer allows the user to select the center	On
and is not affected by the bass control	primary components: a fully variable,								frequency of the boost band as well as the
processing selected for the amplifier. In	24 dB per octave infrasonic filter and a								bandwidth (“Q”) of the boost band. The “Q"	MONO OUTPUT ONLY
“Out Filter” mode, the user can select:	parametric, single-band equalizer.								control selects the bandwidth of the boost
									around the center frequency. Lower numbers
a) High-pass (“HP”) or low-pass (“LP”)	Infrasonic Filter		“Q”		Center Freq.		Boost (dB)		pertain to wider bandwidths while higher
filtering by way of the “Filter Mode” switch.		Mode	1.6			40	+10		number pertain to narrower bandwidths.
b) 12 dB/octave or 24 dB/ octave filter slope by			1.1	2.7	30	60	+4	+13	The “Center Freq.” control selects the center	SUBWOOFER OUTPUT
			0.7		25	75
way of the “Filter Slope” switch.		Off On	0.5	4.3	20	80	0	+15	frequency of the boost bandwidth within	The 500/1v2 employs JL Audio’s exclusive
		30	Bass EQ
c) A filter cutoff frequency between 40 - 200	22	45					Advanced		a range of 20 - 80 Hz. If you would like to	Regulated, Intelligent Power Supply (R.I.P.S.)
Hz for the preamp output signal by way of	18	55					Bass		select the filter frequency with a higher level	design. This sophisticated power supply
	15	60	Off On				Control
the “Filter Control” switch.	Infrasonic Freq. (Hz)			Remote Bass Port					of precision, consult Appendix C: Chart A-4	allows the amplifier to produce its optimum
									(page 17) of this manual. The “Boost” control	power (500 watts x 1) over a wide range of
This is completely independent of the									determines how much boost (in dB) you are	speaker impedances.
amplifier’s internal filter and allows the user to	1) “Infrasonic Filter”: The infrasonic filter is a								adding to the bass signal. A range of 0 - 15dB	Unlike conventional amplifiers that require
match, stagger or overlap the subwoofer low-pass	24 dB/octave high-pass filter, with a fully								of boost is available. The “Remote Bass Port”	a specific impedance to produce optimum
filter frequency of the amplifier crossover with	variable cutoff frequency between 15 - 60 Hz.								allows the connection of an optional remote	power, the R.I.P.S.-equipped 500/1v2 gives
the output filter’s frequency for precise control	When set at frequencies lower than 30 Hz, it								boost knob (the RBC-1) that can be mounted	you the freedom to use a variety of subwoofer
and optimized midbass performance.	conserves amplifier power without audibly								in the front of the vehicle. This optional	configurations that achieve final nominal
If you would like to select the filter frequency	affecting the quality of the sub-bass output. If								control takes the place of the “Boost” knob on	impedances between
with a higher level of precision, consult	set at frequencies higher that 30 Hz, there will								the amplifier when connected and bypasses the	1.5 – 4Ω (without sacrificing power output or
Appendix C: Chart A-2 (page 16) of this manual.	be an audible effect, but one which may be								“Boost” control on the amplifier.	sound quality).
	desirable for SPL competition purposes or curve									The operation of the R.I.P.S. circuitry is
!! CAUTION	shaping of a bottom-heavy system. With ported								! IMPORTANT	entirely automatic and adjusts itself every time
	enclosures, the use of the infrasonic filter is									the amplifier is turned on according to the lowest
The signal level of the “Preamp Output” is	highly recommended to protect the speaker(s)								The “Advanced Bass Control” section will only	impedance present at the speaker load. There are
always low level regardless of the voltage	from excessive excursion below box tuning.								operate when the amplifier’s filter is activated	no user controls to configure. The system
applied to this amplifier’s inputs and the	With sealed enclosures, the use of the filter is								with the “Amp LP Filter” switch in the “12dB”	operates through multiple stages of impedance
setting chosen on this amplifier’s “Input	less necessary, but can still help protect the								or “24dB” position. It will not work with this	optimization, choosing the stage most appropriate
Range” switch. All “Slave” amplifiers should	speaker system. If you would like to select the								switch in the “Off” position. This is to prevent	to the actual impedance of the speaker(s) you
have their switches set to “Low”. See Appendix	infrasonic filter frequency with a higher level of								cascading the processing of multiple amplifiers	connect to it.
D (page 18) for details.	precision, consult Appendix C: Chart A-3 (page								when configured in a master/Slave
	17) of this manual. The infrasonic filter can be								arrangement as shown in Appendix D (page	! IMPORTANT
	completely defeated by selecting the “Off”								18). If you are using an external active
	position on the “Mode” switch. This bypasses								crossover and would like to use the “Advanced	If you connect a load higher than 4Ω nominal
	all signal from flowing through the circuit.								Bass Control” features, set the “Amp LP Filter”	to the 500/1v2, power will drop by half with
									switch on “12dB” and rotate the frequency	every doubling of impedance above 4Ω. If you
									selection knob fully clockwise to the “200 Hz”	connect a load lower than 1.5Ω nominal to the
									position. This will activate the “LF Boost” and	500/1v2, the amplifier protection circuitry
									“Infrasonic Filter” controls without	activates a “safe” mode which reduces amplifier
									significantly affecting the crossover point	power to protect the circuitry from failure (the
									selected by the external active crossover.	yellow LED on the top of the amplifier will
										light to indicate that this has happened). See
										page 12 for details.

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