CALCULATING LOAD IMPEDANCE

The Series 1 Woofers are used for the sub-bass region, those frequen- cies 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 …

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

 

 

1

 

=

1

 

 

 

1

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

R

R

1

+R

2

+ R …

 

 

 

 

 

 

 

T

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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. The crossovers are available from Authorized Rock- ford Fosgate Dealers.

CALCULATING VOLUME

Calculating volume is merely a matter of measuring the dimensions in inches and using the formula: Volume = Height x Width x Depth. The result is in cubic inches. Convert this to cubic feet by dividing by 1,728 (the number of cubic inches in a cubic foot). If two facing sides are of uneven length, add them together and divide by two to get the average. Using this number will give you the volume without the necessity of calculating the box in sections and adding the sections together. The thickness of the baffle material determines the internal volume. The speaker itself also reduces the internal volume. The amount of air displaced by each model is listed on the specification sheet and should also be subtracted from the gross volume calcula- tion.

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Rockford Fosgate S1-808, S1-815, S1-408, S1-812, S1-410, S1-810, S1-415, S1-412 Calculating Load Impedance, Calculating Volume
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S1-415, S1-808, S1-810, S1-812, S1-408 specifications

Rockford Fosgate, a name synonymous with powerful and high-quality audio solutions, has made a significant impact in the world of car audio with their S-Series subwoofers. The S1-412, S1-410, S1-815, S1-408, and S1-812 models are all designed to deliver exceptional sound performance and reliability, catering to both casual listeners and audiophiles alike.

Starting with the S1-412, this subwoofer offers a robust 12-inch design that provides deep bass and impressive power handling. It is equipped with a dual 4-ohm voice coil allowing for flexible wiring configurations. The S1-412 features a high-temperature voice coil that ensures durability during intense use and a rugged injection-molded cone which contributes to its longevity.

The S1-410, another standout, is a versatile 10-inch subwoofer. It boasts a compact design, making it suitable for smaller installations without sacrificing performance. Its heat-resistant materials and reinforced cone design afford increased reliability. With a power rating that matches its larger counterpart, the S1-410 delivers punchy bass and clarity, making it ideal for varied music genres.

On to the S1-815, this 15-inch subwoofer is designed for those who demand maximum bass output. Its larger size allows for deeper frequencies while its advanced cooling technology prevents overheating, drawing out extended playability. The S1-815 is particularly beneficial for those who want to fill larger spaces with booming bass.

The S1-408 model offers another excellent option. This 8-inch subwoofer fits into tight spaces yet maintains the punchy bass response expected from Rockford Fosgate. The advanced suspension system combined with a flexible voice coil design enhances sound accuracy and responsive performance, making it perfect for smaller vehicles or tight enclosures.

Finally, the S1-812 brings together the performance of a 12-inch subwoofer in a well-engineered package. It features innovative cone design and heavy-duty suspension components, allowing it to handle high wattage without distortion. The S1-812 combines versatility with power, making it an attractive choice for a broad range of audio enthusiasts.

All these models share core Rockford Fosgate technologies such as high-temperature voice coils, durable cone materials, and powerful magnet structures, ensuring fidelity and resilience in every bass note. With their precise engineering, the S Series subwoofers are designed to enhance the overall audio experience, providing an unbeatable blend of power, clarity, and style for car audio systems.
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