ARC Audio ARC 12D2 Specyfikacja - Strona 2

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SPEAKER SPECIFICATIONS

8D2

8D4

10D2

10D4

IMP

1 or 4

2 or 8

1 or 4

2 or 8

.95/3.8

1.95/7.8

.925/3.7

1.95/3.9

22.7Hz

24.7Hz

24.5Hz

25Hz

Qes

.317

.367

.357

.365

Qms

3.331

3.572

4.56

5.12

Qts

.289

.332

.331

.341

Vas (cuft)

1.7

1.55

2.0

2.25

Xmax (mm)

15mm

Sd (cm2)

231 cm2

350 cm2

SPL (dB)

85.4dB

85.6dB

87dB

RMS Power

150 W

250 W

MAX Power

300 W

500 W

ENCLOSURE RECOMMENDATIONS

8D2

8D4

SEALED ENCLOSURES

.35cuft

Optimum Sealed

Small Sealed

.2cuft

PORTED ENCLOSURES

Volume

.6cuft

Port Frequency

34Hz

Port Quantity

Port Area and Length

2"d X 12"L

PHYSICAL DIMENSIONS

Displacement

.04cuft

Cutout Diameter

7.125"

Mounting Depth

4.75"

12D2

12D4

15D2

15D4

Impedance

1 or 4

2 or 8

1 or 4

2 or 8

.975/3.9

1.75/7.0

.90/3.6

1.8/7.2

DC Resistance

Resonant Frequency

21Hz

22Hz

20.4Hz

20.5Hz

Electrical "Q"

.298

.317

.443

.431

Mechanical "Q"

4.29

4.35

2.462

2.762

.278

.317

.375

.373

4.76

4.41

9.99

9.88

Equivalent Volume

One way Linear

16mm

18mm

530 cm2

840 cm2

Cone Area

89.dB

89dB

89.dB

89dB

1 watt @ 1 meter

Continuous

350 W

750 W

700 W

1500 W

10D2

10D4

12D2

12D4

15D2

.65cuft

.90cuft

2.25cuft

.5cuft

.65cuft

1.5cuft

.9cuft

1.30cuft

3.0cuft

32Hz

30Hz

32Hz

3"d X 15"L

3"d X 12"L

4"d X 18"L

.05cuft

.07cuft

.17cuft

9.25""

11.125""

5.5"

6.0"

8.0"

Useful Information

Ultimately the enclosure you build determines the performance

of your subwoofer. The size and vent tuning frequency, if you're

using a ported box, determine the low-frequency extension and

output of the subwoofer. We have designed the ARC Audio

subwoofer to perform well when used in both sealed and ported

enclosures.

The acoustics of your vehicle also influence bass response. The

small interior size of most cars and trucks boosts low

frequencies dramatically. You will need to use a smaller

enclosure then normal to achieve a flat bass response. As a

rule, below 50Hz (depending on cabin size), bass response

increases at about 12dB per octave as the frequency

decreases. This "Cabin Gain" adds significant bass output to the

Total "Q"

subwoofer system.

We have given you two enclosure recommendations that are

listed on the previous page. One sealed and one ported. The

sealed enclosure design will, in most cases, give you the best

sound quality and take up less space in your vehicle. The ported

box design will offer more output then the sealed enclosure

(about 3 - 4 dB more), but it will reduce the power handling and

require more space to install. The recommended ported

enclosure is not designed for "competition SPL" performance, it

is designed for normal listening. It will increase the low

frequencies output and increase the overall volume while still

sounding good when properly tuned and installed.

Music

A Note About Power Handling

ARC Audio woofers are designed to perform for years without

any problems. The RMS power noted under the specifications is

the recommended continuous power for long term use. All

woofers make heat. It is possible to dissipate only so much of

this heat. The woofer can handle as much as twice its rated

RMS power for short periods. This is the MAX power rating.

15D4

Continued use of this woofer at greater then the RMS power

rating will result a damaged (burnt) voice coil. This damage is

considered abuse and is NOT covered under the warranty.

2.25cuft

Small Amp Myth

Under powering a woofer is fine. This woofer will suffer no

damage from a 100 watt amp if it is correctly tuned. However,

1.5cuft

even a small amp that is being over driven (clipped) can destroy

a sub. Use your power wisely. Clipping can be heard as a dull

thud or a popping sound. If you hear any change in the tone of

your subwoofer this is a danger sign. TURN IT DOWN. If you

3.0cuft

want more volume get a bigger amp or add another woofer.

32Hz

Physics

"Energy cannot be created or destroyed, only change forms".

What does this mean? Your amp does not make power, it takes

power from your battery and converts it into a different form.

4"d X 18"L

The subwoofer is just another kind of converter. It changes AC

voltage from the amp into changes in air pressure (that's all

sound is) and HEAT. The more energy being converted the

more heat. A speaker can not reproduce DC voltage (produced

.17cuft

when an amp clips) but this energy must go somewhere. It is all

converted into heat. This is why clipping is so dangerous to a

11.125""

speaker.

8.0"

ARC Audio 4719 Greenleaf Cir #4 Modesto CA 95356 Phone:209-543-8706

A great deal of energy can also be lost in the enclosure. If your

box is not strong enough the sides will flex. It takes energy to

flex the box. This energy is not being converted into sound. In

short, the stronger the box the less energy will be lost.

So build it Strong.

This same thing can happen to the car body. Sound deaden, it

will sound better and hit harder.

Building an Enclosure

It is recommended that you use 3/4" MDF (Medium Density

Fiberboard) to build an enclosure. Glue all your joints with

yellow glue and secure then with screws or nails.

Make sure the enclosure will fit and that you have adequate

room to get it in and out of the vehicle.

Calculating Enclosure Volume

It is difficult to give exact box dimensions that are universal

for all cars and trucks. It is for this reason that you must be

able to calculate the space in which you have available in

order to achieve the proper air volume required.

Calculating External Volume

1) To calculate box volume, measure the outside Width x

Height x Depth of the enclosure.

Example 12" x 14" x 9" = 1512 cubic inches.

2) Next you must convert cubic inches into cubic feet. To do

this, you must divide the cubic inch total by 1728 .

Example 1512 cu in 1728 = .875 Cubic feet.

Calculating Internal Volume

1) To calculate the internal (net) volume of the above box you

must first multiply the thickness of the wood you are using by

Two (2).

Example: ¾" x 2 = 1 1/2"

2) Next subtract 1.5" from each of the outside measurements

of the box. Width 12" -1.5" = 10.5" . Height 14" -1.5" = 12.5" .

Depth 9" -1.5" = 7.5"

3) Multiply the new totals (H x W x D)

Example: 10.5" x 12.5" x 7.5" = 984.375 cubic inches.

4) Next you must convert cubic inches into cubic feet. To do

this, you must divide the cubic inch total by 1728.

Example 984.375

1728 = .5696 cubic feet.

For additional information call ARC Audio Tech support at:

209-543-8706