The BMF1000D and the BMF600D will reach their potential output into a 1ohm load. However, a lower impedance can send the amplifier into current protection and possibly damage the circuitry. To prevent damage, use the following formulas to help you figure out the load you are placing on the amplifier. If you have any difficulties, please contact your local Crossfire dealer or Crossfire's Technical Assistance at
Impedance Equations
Parallel Wiring | Series Wiring | Series/Parallel Wiring Dual Voice Coil | Parallel Wiring, Dual Voice Coil |
R | A | B | R | A | B |
Equation | A x B | = R | Equation A + B= R |
A + B |
A | B C |
R
Equation | (A + B) x (C + D) | = R |
A + B + C + D |
DA
B C
R 
Equation 
(A x B)(C x D) =R (A + B) + (C + D)
D
MOUNTING
Appropriate mounting is very important for prolonged life expectancy of any amplifier. Select a location of applicable space that allows sufficient airflow and provides protection from moisture. Keep in mind that an amplifier should never be mounted upside down. Upside down mounting will compromise heat dissipation through the heatsink and will engage the thermal protection circuit much sooner. Excessive heat can shorten your amplifier's life. To maximize heat dissipation, be sure to leave at least 2.5 inches of clearance around the amplifier. Fans should be used in correspondence with an escape duct for heat when mounting the amplifier in an enclosed or restricted area.
Avoid slipping and scratching your new Crossfire amplifier by
x Incorrect Mounting
Heat is trapped inside the amplifier, shortening the life of the electronic components.
| LPF |
| SONIC |
| LEVEL | OVER | L | |
OUT | 250 | 50 | SUB | REMOTE | CROSS | |||
IN |
|
|
|
|
|
|
| R |
| 180 | 0 | SLAVE | ON OFF |
|
| LPF FULL HPF |
|
INVERT MASTER | OUT LINE | IN LOW |
O Correct Mounting
Heat is lifted from the amplifier heatsink.
LOW IN | LINE OUT |
|
| MASTER INVERT |
|
| HPF FULL LPF | OFF ON | SLAVE 0 | 180 |
|
R |
|
|
|
| IN |
L | CROSS LEVEL | REMOTE SUB | 50 | 250 | OUT |
| |||||
| OVER | SONIC | LPF |
| |
POWER CONNECTIONS
All Crossfire amplifiers are designed to work within 10.5 to 16 volts DC. Therefore, as a precaution the vehicle's electrical system should be checked for correct voltage supply with the help of a voltmeter. First, connect the test leads of the voltmeter to the battery terminals with the ignition in of the vehicle in the off position. The voltmeter should read no less than 12 volts. Next check the voltage of the battery with the engine running between 1500 and 2000 rpms. The voltmeter should now read between 13.5 and 14.5 volts. If your vehicle's electrical is not up to these specifications, we recommend having it checked by an automotive mechanic before you further the installation.
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