Rockford Fosgate RFA-408, RFA-812, RFA-810, RFA-412, RFA-410 Using the Punch Audiophile Woofers

Page 6

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.

C A L C U L A T I N G L O A D I M P E D A N C E

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:

RT = R1 + R2 + R3 + etc.

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

 

1

=

1

+

1

+

1

+

1

+ etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RT

R1

R2

R3

R4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Where RT is the total speaker load and R1, R2, 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.

– 3 –

Image 6
Contents Audiophile Woofers Practice Safe Sound Continuous Exposure to Sound Pressure Levels Over 100dBB L E O F C O N T E N T S Epoxy Filled Inverted Dust Caps Dual Input TerminalsIntrodu CTI on Punch Audiophile Woofer Punch Audiophile Woofer manualLOW Frequency Speaker Systems Using the Punch Audiophile Woofers L C U L a T I N G L O a D I M P E D a N C ECA L C U L AT I N G VO L U M E I L D I N G a N E N C L O S U R ECut out two pieces of each panel using 3/4 MDF ConclusionSN OI TA CI FI CE SP WA R R a N T Y in F O R M AT I O N GeneralT E S Rockford Fosgate