JL Audio 1000/1v2 owner manual Crossover Controls, Amplifier LOW-PASS Filter, U T I O N

CROSSOVER CONTROLS					PREAMP OUTPUT SECTION
Crossovers are groups of individual electronic				Tuning Hint: A trunk mounted sub whose	The 1000/1v2 incorporates a flexible preamp				3) “Out Filter”: The preamp output is
filters which allow only certain frequency				output has to "fight" through a rear deck or a	output section, designed to make multiple				filtered by a fully variable, active filter
ranges to pass through them by attenuating				back seat often benefits from the 12 dB/octave	amplifier systems easy to set up.				incorporated into the output section
frequencies outside the selected range. These				slope which lets more upper bass content	The Preamp output can be configured in three				and is not affected by the bass control
filters allow the user to specify what frequency				pass through. A sub that fires directly into	EJGGFSFOU iOutput Modesw				processing selected for the amplifier. In
range will be sent out of each channel section				the listening environment is more likely					iOut Filterw NPEF UIF VTFS DBO TFMFDU
of the amplifier. This, in turn, allows each				to benefit from a 24 dB/octave slope.
speaker system to only reproduce a range of				5IF BCPWF IJOU JT OPU iTFUJOTUPOFwy	Preamp Output Section				B )JHIQBTT iHPw PS MPXQBTT iLPw
frequencies it is well-suited for, resulting in					Output Mode	Filter Slope			GJMUFSJOH CZ XBZ PG UIF iFilter Modew TXJUDI
reduced distortion and improved fidelity.				You should always listen to the system carefully	Full Range Amp Filter Out Filter	12dB 24dB			b) 12 dB/octave or 24 dB/ octave filter slope by
				to determine the best choice as vehicle acoustics					XBZ PG UIF iFilter Slopew TXJUDI
						65		Filter Mode
AMPLIFIER LOW-PASS FILTER				and other factors play a big role in choosing the		55	85		c) A filter cutoff frequency between 40 - 200
						45	120
The 1000/1v2 employs a sophisticated, state-				most appropriate filter slope.		40	200	LP HP	)[ GPS UIF QSFBNQ PVUQVU TJHOBM CZ XBZ PG
variable, low-pass active filter for its internal					Left Output Right Output	Filter Freq. (Hz)			UIF iFilter Controlw TXJUDI
channel. This feature is designed to attenuate				2) Precise Frequency Selection: The filter
frequencies above its filter frequency, so that the				frequency markings on the front panel of					This is completely independent of the
system’s subwoofers do not reproduce any audible				the amplifier are for reference purposes and	1) “Full-Range”:This is a pass-through mode				amplifier’s internal filter and allows the user to
midrange content.				are generally accurate to within 1/3 octave	for the preamp output, delivering the same				match, stagger or overlap the subwoofer low-pass
				or better. If you would like to select the filter	TJHOBM UIBU JT CFJOH GFE UP UIF i"NQMJGJFS *OQVU				filter frequency of the amplifier crossover with
(dB)	Amp LP Filter		A	frequency with a higher level of precision,	4FDUJPOw *G UIF JOQVU TJHOBM JT GVMMSBOHF				the output filter’s frequency for precise control
0	Mode Slope		Input Vo	consult Appendix C: Chart A-1 (page 16)	the preamp output will be full-range). This				BOE PQUJNJ[FE NJECBTT QFSGPSNBODF
+13
+15 Off 12dB 24dB			Low	of this manual. This chart gives you a more	TJHOBM JT OPU BGGFDUFE CZ UIF iAdvanced Bass				If you would like to select the filter frequency
				accurate frequency for each of the forty	Controlw QSPDFTTJOH TFMFDUFE GPS UIF BNQMJGJFS				with a higher level of precision, consult
		65
nced	55	80		detented positions of the frequency selection					Appendix C: Chart A-2 (page 16) of this manual.
	45	100
				control. This method can be very useful if the	2) “Amp Filter”: The preamp output delivers
rol	40	200
	Filter Freq. (Hz)		Left	amplifier is mounted in a location where you	the same signal that is feeding the 1000/1v2’s				!! C A U T I O N
				can’t see the front panel markings easily.	amplifier section, including all the processing

		JOEVDFE CZ UIF iAmp LP Filterw BOE
1) Filter Operation: The low-pass filter in the	3) Defeating the Amplifier Filter: The Low-	iAdvanced Bass Controlw TFDUJPOT 5IJT
W JT GVMMZ WBSJBCMF CFUXFFO  )[ BOE	Pass filter can also be defeated completely,	is primarily used for running additional
 )[ WJB UIF i'ilter Freq.w DPOUSPM LOPC	CZ TXJUDIJOH UIF iMode/Slopew TXJUDI UP UIF	WT JO B i4MBWFw DPOGJHVSBUJPO
and features the ability to select between a	iOffw QPTJUJPO 5IJT JT VTFGVM JG ZPV BSF VTJOH	GSPN UIF i.BTUFSw BNQMJGJFS 'PS EFUBJMFE
NPEFSBUF i12dBw QFS PDUBWF PS B TUFFQ i24dBw	an external active crossover in the system.	JOGPSNBUJPO PO i.BTUFS4MBWFw DPOGJHVSBUJPOT
QFS PDUBWF TMPQF WJB UIF iMode/Slopew TXJUDI	Keep in mind that turning the internal	TFF "QQFOEJY % QBHF   *G UIF iOutput
%FQFOEJOH PO UIF TVCXPPGFS TZTUFN BOE UIF	DSPTTPWFS PGG BMTP EFGFBUT UIF iAdvanced Bass	Modew TXJUDI JT JO UIF iAmp Filterw
vehicle, different slopes may be required to	Controlw TFDUJPO QSPDFTTJOH TFF QBHF  GPS	QPTJUJPO BOE UIF iAmp LP Filterw TXJUDI
produce a smooth transition to the mid-bass	details). With the internal crossover turned	JT JO UIF iOffw QPTJUJPO UIFSF XJMM CF OP
speakers in the system. Experiment to find	off, the 1000/1v2’s upper frequency response	output from the preamp output jacks. The
the slope which best matches the acoustic	MJNJU JT  )[ EVF UP JUT CBTTTQFDJGJD	JOEFQFOEFOU PVUQVU GJMUFS DPOUSPMT iFilter
requirements of your system.	$MBTT % EFTJHO	Slopew iFilter Freqw BOE iFilter Modew
		BSF JOBDUJWF JO iAmp Filterw NPEF

The signal level of the “Preamp Output” is always low level regardless of the voltage applied to this amplifier’s inputs and the setting chosen on this amplifier’s “Input Range” switch. All “Slave” amplifiers should have their switches set to “Low”. See Appendix D (page 18) for details.

8 JL Audio - 1000/1v2 Owner’s Manual 9