Infinity 310a Manuale utente

Reference Series

310a

311a

1 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev2aa10/2005

- CONTENTS -

SPECIFICATIONS ………………………………….……..1

FEATURES/TEST CONDITIONS……..…………………2

CONTROLS/CONNECTIONS………….……..…...…..…3

INSTALLATION………………….……...……..…...…...…5

BASIC TROUBLESHOOTING..…….…….………………7

TYPICAL SYSTEM WIRING..…….…….……………..…8

EXPLODED VIEW/PARTS LIST…….….….…………....9

MECHANICAL PARTS LIST……………..…………......10

AMPLIFIER BLOCK DIAGRAM…………………………11

P.C.B. DRAWINGS….…………………………………….12

ELECTRICAL PARTS LIST ……………………………. 15

REF 311a ELECTRICAL PARTS LIST ADDENDUM….…….….18

IC/TRANSISTOR PINOUTS..…………………………….19

REF 310a SCHEMATICS………..……….…….………..22

REF 311a SCHEMATICS………..……….……….……..24

PACKING…………………….…………………………....26

Reference 310a/311a Specifications

Output Power: 116W RMS x 1 channels @ 4 ohms; ≤1% THD + N

(14.4V supply) 312W RMS x 1 channels @ 4 ohms; ≤1% THD + N

Signal-to-noise ratio: 81dBA (reference 1W into 4 ohms)

Dynamic power: 347W @ 2 ohms

Effective damping factor: 6.398 @ 4 ohms

Frequency response: 17Hz – 302Hz (–3dB)

Maximum input signal: 6.0V

Maximum sensitivity: Reference 310a - 250mV

Reference 311a - 75mV

DC Offset <50mV (-50%)

Output regulation: .05dB @ 4 ohms

Idle Current 800mA

Input Impedance 22kΩ

Max Current Draw 24A @ 4 ohms

40A @ 2 ohms

Dimensions: 12 x 11 7/16 x 2 11/16” (L x W x D)

(305mm x 290mm x 68mm)

Fuse: 30A

Infinity continually strives to update and improve existing products, as well as create new ones. The specifications and details in

this and related publications are therefore subject to change without notice.

Power Amplifier Reference 310a/311a

Reference 310a/311a

•

If the amplifier’s fuse must be replaced, use

only the same type and rating as that of the

original. Do not substitute another kind.

The Reference amplifiers are capable of

delivering high power levels, and require a

reliable connection to the vehicle’s electrical

system in order to perform optimally. See

Figure 1 for connection location. Please

adhere to the following instructions carefully.

GROUND CONNECTION

Connect the amplifier’s Ground (GND) terminal

to a solid point on the vehicle’s metal chassis,

as close to the amplifier as possible. Refer to the

chart below to determine minimum wire-gauge

size. Sand away any paint from this location; use

a star-type-lock washer to secure the connection.

POWER CONNECTION

Connect a wire (see chart at right for appropriate

gauge) directly to the vehicle’s positive battery

terminal, and install an appropriate fuse holder

within 18" of the battery terminal. Do not

install the fuse at this time. Route the wire to

the amplifier’s location, and connect it to the

amplifier’s positive (+12V) terminal. Be sure to

use appropriate grommets whenever routing

wires through the firewall or other sheet metal.

Failure to adequately protect the positive wire

from potential damage may result in a vehicle

fire. When you are done routing and connecting

this wire to the battery and to the amplifier,

you may install the fuse at the battery.The

fuse value should be selected based on total

amplifier-current draw; see chart at right.

REMOTE CONNECTION

Connect the amplifier’s Remote (REMOTE)

terminal to the source unit’s RemoteTurn-On

lead using a minimum of 18-gauge wire. If your

source unit does not have a remote turn-on

connection, connect the amplifier’s (REMOTE)

terminal to the vehicle’s accessory circuit.

WIRE-GAUGE CHART

Amplifier Maximum Minimum

Model Current Draw Wire Gauge

AWG

310a/311a 40A #8 AWG

AWG

These recommendations assume 7' – 10' wire

runs. If your installation differs markedly, you

will need to adjust the wire gauge accordingly.

SPEAKER CONNECTIONS

Refer to the application guides on the pages

that follow. Speaker connections should be

made using a minimum of 16-gauge wire.

NOTE: When using the low-level or high-level

inputs, the AUX outputs can be used to pass a

full-range line-level signal to another amplifier.

POWER CONNECTIONS

Figure 1.Terminal-connection end plate.

Power Amplifier

Reference 310a/311a

The Reference subwoofer amplifiers are

single-channel amplifiers.There are two sets of

terminals to make it easy to connect multiple

woofers. Either set of (+/–) terminals may be

used when connecting woofers.

To the right are two application diagrams to help

plan your subwoofer system installation. Figures

3 and 4 show how to configure the Reference

subwoofer amplifiers

1210a).

NOTE: For simplicity, Figures 3 and 4 do not

show power, remote and input connections.

NOTE: Minimum speaker load is 2 ohms.

APPLICATIONS – 310a/311a

Figure 3. Reference subwoofer amplifier with two woofer connections.

Figure 4. Reference subwoofer amplifier with one woofer connection.

Power Amplifier

Reference 310a/311a

Figure 13. Control end panel.

SETTING INPUT SENSITIVITY

1. Initially turn the INPUT LEVEL control(s) to

minimum (counterclockwise).

2. Reconnect the (–) negative lead to the vehi-

cle’s battery. Apply power to the audio system

and play a dynamic music track.

3. On the source unit, increase the volume

control to 3/4 volume. Slowly increase the

INPUT LEVEL control(s) toward three o’clock

until you hear slight distortion in the music.

Then reduce the INPUT LEVEL slightly until

distortion is no longer heard.

NOTE: After the source unit is on, blue LEDs (on

the top panel) will light, indicating the amplifier

is on. If not, check the wiring, especially the

remote connection from the source unit. Also

refer to “Troubleshooting” on the page 7.

INSTALLATION AND SETUP

REMOTE LEVEL CONTROL (OPTIONAL)

All three Reference subwoofer amplifiers and

the 5760a amplifier have inputs for an optional

remote level control (100rc).This will allow the

subwoofer level to be adjusted from the listening

position. Connect the optional remote level

control using the RJ-11 jack on the side of the

amplifier. Install the control module in the front

of the vehicle within easy reach of the driver.

Both the underside of the dash and the center

console are suitable locations. Refer to the

mounting instructions accompanying the 100rc.

AUX OUTPUT

Reference amplifiers are equipped

with full-range outputs that can be used to

connect additional amplifiers.

NOTE: When using the low- or high-level inputs,

the AUX outputs can be used to pass a full-range

line-level signal to another amplifier.

Power Amplifier

Reference 310a/311a

STATUS LEDs

Clip: Indicates the amplifier is being overdriven,

and your speakers may be in danger.This

should blink only on musical peaks, and not

be on constantly.

Power: Indicates the amplifier is on.

Protection: Refer to “Troubleshooting” for specific

indications.

Figure 15. LED status.

SETTING DBO™

The Dynamic Bass Optimizer (DBO) is used to

enhance low-frequency reproduction in a vehicle.

Conventional bass-boost circuits only increase

bass at a fixed frequency, and cause the amplifier

to consume considerable power.The DBO allows

you to adjust the frequency (20Hz – 80Hz) as well

as the boost level (up to 12dB; see Figure 14),

allowing you to fine-tune the bass in your system

to optimize performance.

For sealed enclosures, the DBO can be used

to enhance the lower bass region of sealed

enclosures.

For bigger/fuller bass, adjust the HP FREQ

between 35Hz and 45Hz; adjust the BOOST

control according to your preference.

For tighter-sounding bass, adjust the HP FREQ

between 45Hz and 55Hz; adjust the BOOST

control according to your preference.

For vented enclosures, the DBO should be used

as a subsonic filter to reduce overexcursion

of the woofers. Set the HP FREQ control 10Hz

below the tuning frequency of the enclosure

(e.g., 25Hz for a box tuning of 35Hz); adjust the

BOOST control to taste.This will conserve

amplifier power typically wasted on frequencies

below the tuned frequency of the enclosure.

For infinite-baffle applications, set the HP FREQ to

the speaker’s Fs value (reducing overexcursion of

the woofer); adjust the Boost control to taste.

Figure 14. Frequency-response curves show

typical DBO control ranges.

INSTALLATION AND SETUP (CONT.)

-9

-6

-3

-12 20 80 Freq. (Hz)

DBO HP FREQ Control

(adjusts cut-off

frequency)

HP FREQ

100Hz20Hz

-6

-12 20 80 Freq. (Hz)

DBO BOOST Control

(adjusts boost amount

at cut-off frequency)

BOOST

MAXMIN

Power Amplifier

Reference 310a/311a

•

PROBLEM:

No audio (POWER LED is off).

CAUSE and SOLUTION:

No voltage at BATT+ and/or REM terminals, or

bad or no ground connection. Check voltages

at amplifier terminals with VOM.

•

PROBLEM:

No audio (PROTECT LED flashes every

4 seconds).

CAUSE and SOLUTION:

DC voltage on amplifier output. Amplifier may

need service; see enclosed warranty card for

service information.

•

PROBLEM:

No audio (PROTECT LED is on).

CAUSE and SOLUTION:

Amplifier is overheated. Make sure amplifier

cooling is not blocked at mounting location;

verify that speaker-system impedance is within

specified limits.

•

PROBLEM:

No audio (PROTECT and POWER LEDs flash).

CAUSE and SOLUTION:

Voltage less than 9V on BATT+ connection.

Check vehicle charging system.

•

PROBLEM:

No audio (PROTECT LED is on).

CAUSE and SOLUTION:

Voltage greater than 16V or less than 8.5V on

BATT+ connection. Check vehicle charging

system.

•

PROBLEM:

Distorted audio.

CAUSE and SOLUTION:

Input sensitivity is not set properly, or amplifier

or source unit is defective. Check INPUT LEVEL

setting, or check speaker wires for shorts or

grounds.

•

PROBLEM:

Distorted audio (PROTECT LED flashes).

CAUSE and SOLUTION:

Short circuit in speaker or wire. Remove

speaker leads one at a time to locate shorted

speaker or wire, then repair.

•

PROBLEM:

Music lacks “punch.”

CAUSE and SOLUTION:

Speakers are not connected properly. Check

speaker connections for proper polarity.

TROUBLESHOOTING

Power Amplifier

Reference 310a/311a

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