Focal BombA 27 V1 User manual

6
Congratulations on choosing Focal automobile speakers.
To gain the best results from your speakers, please ensure you follow these recommendations,
and keek carefully this user manual so that you can consult it later. If not followed correctly any fault
observed may not be covered by the guarantee.
Precautions
For the subwoofer to perform at its best, we recommend to use it in a location where temperature
doesn’t go below 5°C.
• The location must also be dry and offer adequate ventilation.
• The supply voltage requirement is 12VDC (13.8VDC) with the negative connection grounded.
Please make sure that the characteristics of your vehicle correspond with this requirement before
connecting the equipment.
• For safe driving, we recommend that you operate your sound equipment at a listening level that does
not conceal traffic noise.
Warning!
The performance of the Focal BombA 27 V1 allows high sound pressure levels to be generated.
We remind you that sustained listening beyond 110dB SPL can permanently and irreversibly damage
your hearing. We recommend that you adjust the level of your equipment correspondingly.
For safety reasons, it is essential that you securely fix the subwoofer enclosure in the boot (make sure
you do not drill through the petrol tank if you fix it with screws).
Mounting kit included:
- 2 x nylon straps
- 4 x metal roll bar
- 8 x fixing screws
- 1 x template
The Focal guarantee only applies if page 11 is
returned to us within 10 days of purchase.
BombA 27 V1 User Manual

Mounting
A power supply kit dedicated to the BombA cabling will shortly be available at your supply.
• Unplug the «+» from the battery
• Make sure you follow the car manufacturer instructions (airbag, alarm system, computer,
immobiliser ...).
• Always use battery lead connections.
Cable routing
The 12V supply cables should be passed down one side of the vehicle and the signal cables down the
other. These cables must be suitably protected to avoid any damage to the insulation, especially when
feeding the cable through from the engine compartment to the passenger cabin.
Power supply 
(+) The 12V cable must be connected to the battery with a cable of appropriate quality and size,
8mm2(7AWG) . Protect the installation with a 30A fuse on this cable fitted less than 40cm (16”) away
from the battery.
(-) The ground wire must be connected to the chassis of your vehicle with a perfect electrical
connection (remove some paint to reveal bare metal if necessary) and with a cable of the same specifica-
tion as used for the + feed.
Connect the remote cable to the electrical aerial output or to the remote output of your radio.
Low level input (RCA) 
Connect to the RCA output of the radio
High-level input 
Connect to the loudspeaker outputs of the radio.
Never connect the RCA and the high-level inputs together.
Adjusting the Volume 
The volume setting allows you to match the level of the BombA with the level of the front system.
Setting: - Turn the gain on the BombA down completely
- Turn the radio up to a normal listening level.
- Turn the gain up on the BombA until you get the required balance.
Bass-boost 
3 settings: -Classic
- Techno
- Pop
Note that these settings should be used together with the level adjustment.
7
BombA 27 V1 User Manual

Phase inverter 
It allows you to phase the subwoofer (generally advised) or unphase it.
The right setting is determined by listening and finding the one (matching with the front system)
that provides the most bass.
Adjustable cut-off frequency 
An electronic crossover removes medium and high frequencies beyond a point set by the user. The ideal
is to extend the bass frequencies in an even and continuous manner from where the front system rolls
off. In general, a cut-off frequency located between 80 and 100Hz should be suitable for most systems.
This setting becomes more critical when the BombA is used within a high-end hi-fi system.
The idea cut-off frequency will only be found after extensive listening to a wide range of musical.
Warning! Very few recordings possess real bass frequencies. Bass notes such as those found in Rock,
Techno, Ragga music etc. are rarely located within the extreme bass area, but more likely in the high
bass band.
As a consequence, it is recommended to select a cut-off frequency between 100 and 120Hz for these
styles of music. However, you may prefer a lower cut-off frequency for classical music.
It is possible to set the cut-off frequency anywhere between 40 and 160Hz
This adjustment should be made in reference to the listening position and with your preferred type of
music.
For a more precise adjustment, your retailer may use an analyzer (RTA).
Dimensions :
8
A = 12-3/16” - 310mm
B = 14-5/8” - 371mm
C = 6-11/16” - 170mm
L = 18-1/3” - 466mm
BombA 27 V1 User Manual

Amplifier setting and connections
guide
9
Low level inputs
(4V compatible)
3 bass-boost settings
- Classical
- Techno
- Pop
Adjustable cut-off
40 - 160Hz
at 18dB/oct
Adjustable level
Phase settings
(o°/180°)
High level imputs
for compatibility
with all types of installation
Power
Protection fuse
Integrated Subsonic Filter 24dB/oct
+SPL +Extreme Bass +Quality …







Issue Cause Solution
Can’t switch on the
BombA
No +12V on the supply
Ground not properly connected
Fuse broken
Check connections to battery
Check connection
Change fuse
The BombA is on,
but no signal
No signal
No remote
Level control ineffective
Check signal cable
Check power on the remote
Turn up the volume on the source.
Output distorted Source level too high
Gain of the amplifier too high
Turn down the source level
Turn down the gain of the amplifier
Fuses blown Output levels too high Turn the volume down
BombA 27 V1 User Manual

Due to constant technological advances, Focal reserves its right to modify specifications without notice. Images may not conform exactly to specific product. ©Focal-JMlab
Focal®is a trademark of Focal-JMlab®
B P 3 7 4 - 1 0 8 , r u e d e l ' Av e n i r - 4 2 3 5 3 L a Ta l a u d i è r e c e d e x - Fr a n c e - w w w. f o c a l - f r. c o m
T é l . 0 0 3 3 4 7 7 4 3 5 7 0 0 - Fa x 0 0 3 3 0 4 7 7 3 7 6 5 8 7
Tecnical specifications
Guarantee
All Focal loudspeakers are covered by guarantee drawn up by the official Focal distributor
in your country.
Your distributor can provide all details concerning the conditions of guarantee. Guarantee cover extends
at least to that granted by the legal guarantee in force in the country where the original purchase invoice
was issued.
10
BombA 27 V1
Subwoofer 27cm (11")
Height 310mm (12-3/16")
Base width 371mm (14-5/8")
Lenght 466mm (18-1/3")
Built-in amplifier 150 Wrms / 300W max.
Frequency response 36Hz-160Hz
BombA 27 V1 User Manual