Coustic 401SE, 601SE TROUBLE-SHOOTING Section, Bass Boost Control Boost, Symptom Probable Cause

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Figure 13: 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 23 of its maximum output.

3.Turn the balance control of the source unit to its center position.

4.Leave the tone (bass/treble) controls at their usual position.

5.Play a CD or tape track with wide dynamic range.

6.Use the Bass Boost Control to enhance the bass performance (if desired).

7.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 counter clockwise slightly to minimize the distortion.

8.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.

BASS BOOST CONTROL (BOOST)

Select a boost level between 0dB and +18dB to enhance the bass performance for your sound system. BASS BOOST is NOT free! Every 3dB of boost costs you twice as much in power. Make sure to set the final gains . . . after setting the Bass Boost to work best with your subwoofer/ enclosure combination. More is NOT always better!

SETTING UP & USING REMOTE SUBWOOFER GAIN CONTROL (R S)

If you are using the R S control, make sure to take this into account during set-up procedures of the subwoofer amplifier. You should set the system up with the R S plugged in, and with the level knob turned all the way down (counter clockwise).

NOTE: the R S ONLY works when you’ve selected the LPF (low-pass) crossover configuration.

 

 

COUSTIC.COM

 

 

 

 

TROUBLE-SHOOTING SECTION

SYMPTOM

PROBABLE CAUSE

1.

No power

Check connections to the amplifier's Ground, B+ & Remote

 

 

terminals. Check connection at "+" terminal of the battery.

 

 

Check the remote turn-on terminal. Ensure it receives power

 

 

when the source is turned on (or when the switch is turned

 

 

on). Refer to the Installation Section. Check the power line

 

 

fuse: if fuse is blown, replace it; if fuse continues to blow,

 

 

check the power wire and also the amplifier for a short. If the

 

 

short is in the power wire, fix it; if the short is in the amplifier

 

 

itself, see your Coustic dealer.

 

 

Check the voltage at the amplifier, and the remote ON/OFF

 

 

lead. The voltage should measure between 11 V - 15 V. If the

 

 

measurement is beyond this range, have the source unit

 

 

checked out by an authorized dealer.

2.

Power without sound with

Turn the amplifier off, and Check all input & output signal

 

red power/protection

cables and connections. Check the speakers for short with

 

indicator on

a VOM (volt meter) or by connecting them to another audio

 

 

system. After making sure everything is normal, turn the ampli-

 

 

fier on again.

3.

Power without sound with

The continuous red light of the power indicator signals a

 

red power indicator on

high internal operating temperature, which results in the

 

 

amplifier switching off temporarily; when the amplifier cools

 

 

down to a safe level, the amp will automatically restart.

4.

No sound from one side

Check balance control.

 

 

Check speaker connections.

 

 

Check signal input connection.

5.

Very low sound from

Check your radio's fader control.

 

both radio & tape

Check the amplifier's Input Sensitivity Level.

6.

Frequent automatic

This indicates that the amplifier is operating at a continually

 

amplifier shut down

undesirable high internal temperature. High operating temper-

 

 

ature caused by inadequate ventilation: Refer to the sub-sec-

 

 

tion titled LOCATION for better amplifier location.

High operating temperature caused by an excessively low impedance load, say below 2 ohms stereo or 4 ohms bridged: Check for bad speakers and/or electronic crossover, proper passive crossover components; if all else fails, try rewiring the entire system.

High operating temperature can be caused by an incorrect input sensitivity level: refer to sub-section titled INPUT SENSI- TIVITY ADJUSTMENTS for correct setting.

7."Motorboating": The amplifier power indicator going off repeatedly when the audio system is on

8.Whining noise when engine is running with noise varying with the accelerator (noise level varies with source unit volume control)

Check the amplifier's connection to the battery. Check battery voltage. If low, recharge or replace battery. Check all ground connections.

Reroute power cable from battery to source unit directly, bypassing the battery terminal in the fuse box. Check power connections to be sure they areclean. Check ground connections to be sure the ground wire is in direct contact with the bare metal surface of the chassis (with that spot scraped clean of any paint, rust or grease).

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Contents Mode D’EMPLOI Features WelcomeCONTROLS, INDICATORS, and Terminals Input PanelMounting InstallationLocation BI-AMPLIFICATION Typical Multi-amplifier systemFor Stereo Mode For Bridged Mono ModeInput Connections Speaker ConnectionsAdjustments TROUBLE-SHOOTING Section Setting UP & Using Remote Subwoofer Gain Control R SSymptom Probable Cause Bass Boost Control BoostSpecifications SymptomBienvenu CaractéristiquesCONTRÕLES, Indicateurs ET Connecteurs Panneau des entrées et des réglagesEmplacement MontageInstallation traditionnelle Connexion DU Signal Connexion DES Câbles HAUT-PARLEURSRéglages EN CAS DE Difficulté Caractéristiques Techniques AttetionCoustic Limited Warranty Important Notice to ConsumerU 0 0 0 7 6 8 R e v B 1 / 0