Rockford Fosgate 250.1 8.0 VAC, Level Setting the BLT, Disconnect Speakers from the, Gain Overlap

Level Setting the BLT

									R
		AUD			CLOCK	AUTO		ILLUM	SEL
		DISC	ST	Ch	DSPL	P.SCN		LOUD
	VOL	AMFM		LD RDM RPT					TUNE
		PWR		D.SCN SCAN		RPT	RDM	DIM
									PAUSE
				1	2	3	4	5	6
	1kHz Test Tone @ “0dB”
8.0 VAC				®					®
					BALANCED LINE TRANSMITTER
						L		R
+	–			L
				R

AO

DP

VE

AR

A N T C I E O

D N

•Disconnect Speaker(s) from the 250.2

•CD Software used to set levels is a test tone of 1kHz at “0dB” or “All Bits High”

•Source Unit set to 3/4 volume (or maximum unclipped output)

•Remove BLT Cover to access test pads and gain pots

•AC Voltmeter set to AC Volts

•AC Voltmeter “–” connected to RCA shield of BLT

•AC Voltmeter “+” connected to test pad inside the BLT

•Adjust BLT Gain from 2.5 VRMS min. to 8.0 VRMS max per test pad (see chart below) Be sure the time index reads greater than 30 seconds on source unit.

Gain Overlap	BLT Output (AC Volts)	Performance Characteristics
+0dB*	2.5 VRMS	Best S/N Ratio, Reduced SPL
		(Used for Optimum Sound Quality)
+5dB	4.5 VRMS	Good S/N Ratio & SPL
		(Use for Audiophile Listener)
+10dB	8.0 VRMS	Best Compromise between S/N Ratio & SPL
		(Used for Average Listener)

*Absence of gain overlap will reduce SPL and may not permit amplifier to reach full output power due to various CD software.

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