Rockford-fosgate RFA-410 User Manual download pdf (Page 6)

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USING THE PUNCH AUDIOPHILE WOOFERS

Speakers are built in different sizes to optimize their performance in

different frequency bands. Crossovers are used to route the different

frequency bands for each appropriate speaker. There are two opera-

tional types of crossovers, active and passive. An active crossover is

an electronic filter which is placed before the amplifier and separates

the signal fed to different amplifiers in the system. A passive crossover

is positioned after the amplifier and separates the signal fed to each

speaker in the system. Active crossovers offer the accuracy and

flexibility needed for a sophisticated system and are used in complex

multiple amp designs. Passive crossovers (capacitors and inductors)

allow the use of multiple speakers in a simple system which can easily

be expanded over time. We recommend using a 6dB per octave,

100Hz low pass crossover for the Punch Audiophile Woofers when

used with a passive system.

To customize the installation, try adjusting the crossover point one

octave up or down to optimize the system staging.

The Punch Audiophile Woofers are used for the sub-bass region,

those frequencies below 100Hz. This is the foundation for the music

and the frequency range you feel. Before selecting the passive

crossover it is necessary to calculate the load impedance of the

speaker system. In a series circuit the impedance is determined by

the formula:

= R

+ R

+ etc.

In a parallel circuit the impedance is determined by the formula:

Where R

is the total speaker load and R

, R

, etc. represent each

speaker in the system.

The crossover is connected in line to the positive terminal of the

speaker system. Crossovers are available from Authorized Rockford

Fosgate Dealers.

1 1 1 1 1

=++++ etc.

CALCULATING LOAD IMPEDANCE

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Rockford-fosgate RFA-410 User Manual Page 6