Crossfire C7 series - User Manual

C7-sERIESC7-sERIES
SUBWOOFER MANUALSUBWOOFER MANUAL
Thanks for buying our product!
Product information follows; please read it carefully to get the most out of your
subwoofers. Any questions, you can contact technical support:
Phone 972-570-0800; Email: tech@crossfi recaraudio.com
Enjoy!
Subwoofer Power Rating:
Subwoofer Power Rating:
Power handling for subwoofers depends on the conditions used. How loudly you play, what type of music and how hard
you drive the amplifi er are more important than any numbers-but of course, some kind of numeric guideline is necessary for
convenience. Therefore, Crossfi re rates as follows:
Nominal Power Handling:
This amount of RMS amplifi er power should not cause damage to a subwoofer in a
recommended enclosure-so long as the amplifi er is not clipped.*
Maximum Power Handling:
This amount of RMS amplifi er power driving the subwoofer at maximum volume continuously
could cause damage over time and should be used with caution and without clipping the amp.
Notes On Amplifi er Power:
The important rating of an amp is RMS power. If this spec is not exaggerated, it is how many watts the amp can output
continuously without distortion. Other specs (“peak” ; “maximum”) are not very meaningful in most cases. How does this match a
subwoofer’s power rating? Read on...
Notes On Subwoofer Limits:
Subs have two limitations:
mechanical
and
thermal
. Crossfi re combines these into the ratings explained at the top.
Thermal power handling
of the woofer is basically how many watts you can pump into it before it burns or melts:
-Amps’ RMS power similar to the subwoofers rating should a good match providing the amp is not clipped
-Amp’s RMS power much more than subwoofers rating: could damage the sub unless gains are carefully set to prevent the
amplifi ers ever clipping.
-Amp’s RMS power much less than the subwoofers rating: could still damage the sub if the amp is clipped.
Mechanical power handling
means how far the cone can move before physical parts hit or deform (“bottoming out”). At very
low frequencies, it does not take much power to move the subwoofer cone a lot, so even low powered amplifi ers could damage
the subwoofer. The enclosure affects how easy it is to hit the mechanical limits: please see notes on a later page.
*Amplifi er Clipping and Dead Subwoofers:
When “Clipped” the amplifi er tries to put out more power than it is capable of, and the output waveform fl attens out, no longer
following the music. Viewed on an oscilloscope, it looks like the music waveform has had the tops “clipped off” with scissors.
Under these conditions, an amplifi ers could put out over twice it’s rated RMS power, causing a subwoofer to overheat.
Additionally, a clipped amplifi er can generate DC currents which will drive the subwoofers coil out of position: it may burn and/or
hit mechanical limits more easily. A clipping amp will sound highly distorted and crackly. A sub hitting it’s mechanical limits tends
to sound like a jackhammer or woodpecker. These sounds often indicate damage could be imminent.
- Bottom line? If it sounds not merely loud but nasty, TURN IT DOWN before something breaks!

Summary

Power Handling and Subwoofer Limits

Subwoofer Power Rating Explanation

Defines how power handling is rated for subwoofers based on usage conditions.

Nominal vs. Maximum Power Handling

Explains the difference between nominal and maximum RMS power handling for subwoofers.

Amplifier Power Matching

Discusses matching amplifier RMS power to subwoofer limits and avoiding clipping.

Subwoofer Operational Limits

Details mechanical and thermal limitations that can lead to subwoofer damage.

Box Design Notes

Sealed vs. Ported Enclosures

Compares sealed and ported enclosures regarding sound quality, power, and heat management.

Box Stuffing and Port Tuning

Explains stuffing effects on sealed boxes and port design principles for tuning.

Port Design Considerations

Discusses port length, area, and the benefit of rounded port ends for airflow.

Dual Voice Coil Wiring Options

Single Subwoofer Wiring

Illustrates series and parallel wiring for a single dual voice coil (DVC) subwoofer.

Multiple Subwoofer Wiring

Shows parallel wiring for 2-3 subwoofers, detailing impedance results.

Four Subwoofer Wiring

Depicts parallel wiring for 4 subwoofers with impedance calculations for DVCs.

Limited Warranty Information

Warranty Coverage and Claims

Outlines the one-year warranty, transferability, and process for making a claim.

Warranty Exclusions

Lists conditions and damages not covered by the warranty, such as abuse or misuse.

Re-Cone Policy

Explains warranty coverage for subwoofers that have undergone re-coning by Crossfire.

Crossfire C7 series Specifications

General

Brand	Crossfire
Model	C7 series
Category	Subwoofer
Language	English