Coustic 160SE owner manual Final System Check, Input Sensitivity Adjustment, Crossover Selection

FINAL SYSTEM CHECK

INPUT SENSITIVITY ADJUSTMENT

The Input Sensitivity Control is located on the Front Panel. The objective of input sensitivity adjustment is to match the output of the source unit with the input of the amplifier. The output voltage of individual source units can vary. For example, some radios have an output of 200 mV, others have 5 Volts or more. To cater to these variations, the 160SE amplifier has an adjustable input sensitivity level that ranges from 100 mV to 5 volts.

Adjusting this control requires some experimenting. Basically you want all the gain at the begin- ning of the system, NOT at the end (amplifier). Turn your headunit volume UP and keep your amplifier gains at the minimum possible settings. This will give you the best sound and lowest signal to noise ratio.

Besides better sonic reproduction, proper input sensitivity also helps to prolong the reliability span of your amplifier by eliminating excessive internal temperature generated by incompatible source unit output and amplifier input.

Note : Turning the input gain UP does NOT indicate MORE power. Just MORE noise. The input gain control IS NOT a power control. REMEMBER that the input gain control has nothing to do with the power output of the amplifier.

NPUT SENSMODE

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CROSSOVER SELECTION

The amplifier has built-in high-pass/low-pass filters that can be defeated by sliding the switch to the OFF position.

1.When the high-pass is selected, the amplifier will be devoted to mid/tweeters.

2.When the low-pass is selected, the amplifier will be used to drive woofers/subwoofers.

3.When the filter is switched off, the amplifier is used as a full range amplifier.

CROSSOVER FREQUENCY SELECTION

Both the high-pass and the low-pass section offer 2 crossover frequencies - 80 and 120 Hz. Choose the setting according to your speaker component specification or to your particular preference.

80Hz - Low-pass selected

SS		MODE	FREQ
	MAXMAX	HPF OFF LPF	80 120

Figure 10: Crossover Frequency Selection

MIN	MAX HPF OFF LPF
5 volts	30
	.1 volt

Figure 9: Input Sensitivity Control

1.	Turn the Input Sensitivity Control all the way down (counter clockwise).
2.	Set the volume control of the source unit to approximately 2/3 of its maximum output.
3.	Turn the balance control of the source unit to its center position.

RCA
outputs	OPTION 1 -RCA Outputs
	CD-328
PWR
+	II
SEL
	DISC
–	TUNE1 2 3 4 5 6

CD527 CD/RECEIVER

and CD CHANGER CONTROL

OPTION 2 -Speaker lead Outputs

(Note: You cannot use both RCA and speaker lead inputs simultaneously!!)

FRONT

speaker lead

outputs

A

B

Battery

B

–	A.S.	+		Auto Aligned				MODE	POWER
				Azimuth System				P. C
								L
	TRACK		P.ME			DIS	PRO	BAN	DIS
							G	D	P
			ASM	LOU		TUNEC
			M	D		70∝	SHUFF D.SCAN DISC D.RPT		70∝ s TPS
				TP			TRACK	ME	AM FM 1 2
1 D. SCAN		2 SHUFF	3 T.	S	5 D. RPT	S			3
				4 T. SCAN		6 P. PLAY			ST
			RPT						LOUD

Anybody’s leased car: high power In dash

4.	Leave the tone (bass/treble) controls at their usual position.
5.	Play a CD or tape track with greater dynamic range
6.	To locate the optimum input sensitivity setting, ask the person assisting you to turn the Input
	Sensitivity Control clockwise until audio distortion starts to develop. Turn the sensitivity
	control backwards slightly to minimize the distortion.
7.	If you constantly switch between CD/tape and radio, you will need further adjustment since
	radio output level differs from that of CD or tape. In this case, you need to locate a balanced
	sensitivity setting which is best for both the output level of radio and that of CD or tape.

option 2	160SE
FRONT speaker	POWER AMPLIFIER
lead Inputs
LoZ	(crossover set at 80Hz)

option 1

FRONT RCA

lead Inputs

HiZ

–

+

HS-652a

6 1/2 inch Co-Axial

–

+

12

A

B

Figure 11. Typical System connection

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