P128DC - Car speaker BOSS - Free user manual and instructions

Product Type	Car Speaker
Brand	Boss
Model	P128DC
Category	Coaxial Speaker
Speaker Size	12 inches
Power Handling (Peak)	300 Watts
Power Handling (RMS)	100 Watts
Impedance	4 Ohms
Sensitivity	90 dB
Frequency Response	35 Hz - 20 kHz
Mounting Depth	3.5 inches
Cutout Diameter	11 inches
Cone Material	Polypropylene
Surround Material	Rubber
Net Weight	3.5 lbs
Dimensions (Diameter x Depth)	12 x 3.5 inches
Recommended Amplifier Power	50-150 Watts RMS
Installation Notes	Mount securely, avoid contact with water
Maintenance	Clean with a dry cloth, avoid solvents
Safety	Disconnect battery before installation; do not exceed power rating
Spare Parts	Contact Boss customer service for replacement parts

Frequently Asked Questions - P128DC BOSS

What is the speaker size of the Boss P128DC?

The Boss P128DC is a 12-inch car speaker, making it suitable for most standard car speaker locations.

What is the power handling of this speaker?

It can handle up to 300 Watts peak and 100 Watts RMS continuous power. Ensure your amplifier output does not exceed the RMS rating for optimal performance.

What is the impedance of the Boss P128DC?

The impedance is 4 Ohms, which is standard for most car audio systems and amplifiers.

What is the frequency response of this speaker?

The frequency response ranges from 35 Hz to 20 kHz, providing a balanced sound across bass, midrange, and treble.

What are the mounting dimensions for the P128DC?

The speaker requires a cutout diameter of 11 inches and has a mounting depth of 3.5 inches. Always verify clearance in your vehicle.

Can I install this speaker in a door or rear deck?

Yes, the P128DC is designed for universal fit and can be installed in doors, rear decks, or custom enclosures as long as the mounting depth and cutout dimensions match.

Does the Boss P128DC come with a grille?

Most packages do not include a grille; you may need to purchase one separately or use existing factory grilles.

How should I clean and maintain the speaker?

Clean the speaker with a soft, dry cloth. Avoid using water, solvents, or abrasive cleaners, as they can damage the cone and surround.

What safety precautions should I take during installation?

Always disconnect the vehicle's battery before working with speakers to prevent electrical shock or short circuits. Ensure all connections are secure and insulated.

Where can I find spare parts for the P128DC?

For spare parts like grilles or mounting hardware, contact Boss customer support or visit their official website for authorized replacements.

USER MANUAL P128DC BOSS

Wiring

Please take every precaution to wire your DVC woofers for the correct impedance

12"(305mm)Subwoofer

(1200 Watts RMS)

■ 12"(305mm)ELECTROPLATE INJECTION CONE BUTYL RUBBER SURROUND
■ DUAL 2.5"(64mm)HIGH TEMPERATURE ALUMINUM VOICE COIL
■ 2400 WATTS PEAK/1200 WATTS RMS
■ FREQUENCY RESPONSE:25Hz-1.5KHz
■ SENSITIVITY:96dB(1WATT/1 METER)
■ IMPEDANCE:DUAL 4OHMS
■ MOUNTING DEPTH:7-1/8"(181mm)
■ MOUNTING DIAMETER:10-2/5"(265mm)

Recommended Enclosures

Please note : Our recommended box volumes are given for internal air requirements.

Frequency

Sealed Enclosure

Box Volume : 1.68 Cu Ft

Technical line drawing of a mechanical component or bracket (no text or symbols)

Box is given as internal air volume including driver displacement

Frequency

Ported Enclosure

Box Volume : 1.95 Cu Ft

Pure technical line drawing of a mechanical component without any text, numbers, or symbols

Box is given as internal air volume including driver displacement

Port Frequency	:	34	Hz
Port Diameter	:	3	Inches
Port Length	:	6	Inches

Product Specifications

Speaker Impedance

Free Air Resonance	(Fs)	34	34
Total Q Driver @ FS including all resistance's	(Qts)	0.303	0.542
Q of the Driver @ FS including non electrical resistance only	(Qms)	4.236	5.711
Q of the Driver @ FS including electrical resistance only	(Qes)	0.326	0.598
The Driver's compliance expressed as an equivalent	(Vas)	54.779	54.864
Volume of all (cubic Ft.)
The Driver's linear displacement (inches)	(Xmax)	0.5	0.5
The DC resistance of the driver's twin voice coils(ohms)	(Re)	1.7	3.4
Thermal Power rating of Driver (Peak / R.M.S.)	(Pe)	2400W/1200W	2400W/1200W
The Driver's sensitivity (dB)	(Sens)	95	95

Calculating Enclosures

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.

It is recommended to build your enclosure from 3/4" thick MDF (medium density fiberboard). Make sure the enclosure is sealed air tight.

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"
2) Next you must convert cubic inches into cubic feet. To do this, You must divide the cubic inch total by 1728". Example 1512 ÷ 1728 = .875 Cubic feet
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; 3/4" x 2"=1.5"
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
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

Calculating Internal Volume