FMOD ™ Inline Audio Crossover High Pass Filters (Gold Finish)
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FMOD ™ Inline Audio Crossover High Pass Filters (Gold Finish)
Product Details
🇺🇸 MADE IN THE USA 🇺🇸
Standardized at 22K ohms and a -3db frequency point.
Protect your speakers and eliminate distortion with precision. With a 12 dB per octave slope, these plug-and-play Harrison Labs (Red Label) FMOD’s (sold in pairs) are professional passive RCA line level crossovers that filters out unwanted low frequencies before they reach your amplifier. By removing subsonic noise and power-robbing low-end, these inline filters ensure your audio system plays louder, cleaner, and more efficiently. These filters are available in a premium gold finish and the new platinum edition finish, offering the same high-performance engineering in a sleek silver look to match your system’s aesthetic.
Choosing the Right High Pass Frequency
For optimal performance, technical precision is essential. If you are undecided between two frequency values, the professional recommendation is to err on the side of the higher value.
Selecting the higher frequency provides a greater safety margin, protecting your speakers from low-end strain and over-excursion. This ensures a cleaner, more efficient output and superior protection for your professional or car audio system.
Harrison Labs · FMOD Series
Color Code Guide
Every FMOD inline crossover filter is marked with a color band mapped to a standard crossover frequency. Red labels are high pass, black labels are low pass. Tap a band to see its exact −3dB spec at 10K and 47K ohm loads.
20Hz crossover
black band · high pass only
Low Pass
Not offered in this band
High Pass
25Hz @ 10K Ω
17Hz @ 47K Ω
30Hz crossover
2 black bands · high pass only
Low Pass
Not offered in this band
High Pass
37Hz @ 10K Ω
26Hz @ 47K Ω
50Hz crossover
brown band
Low Pass
54Hz @ 10K Ω
46Hz @ 47K Ω
High Pass
62Hz @ 10K Ω
43Hz @ 47K Ω
70Hz crossover
purple band
Low Pass
76Hz @ 10K Ω
64Hz @ 47K Ω
High Pass
87Hz @ 10K Ω
60Hz @ 47K Ω
80Hz crossover
2 purple bands
Low Pass
86Hz @ 10K Ω
74Hz @ 47K Ω
High Pass
100Hz @ 10K Ω
68Hz @ 47K Ω
100Hz crossover
no band
Low Pass
108Hz @ 10K Ω
92Hz @ 47K Ω
High Pass
125Hz @ 10K Ω
85Hz @ 47K Ω
150Hz crossover
2 blue bands
Low Pass
162Hz @ 10K Ω
138Hz @ 47K Ω
High Pass
187Hz @ 10K Ω
128Hz @ 47K Ω
200Hz crossover
blue band
Low Pass
216Hz @ 10K Ω
184Hz @ 47K Ω
High Pass
250Hz @ 10K Ω
170Hz @ 47K Ω
300Hz crossover
2 white bands · high pass only
Low Pass
Not offered in this band
High Pass
375Hz @ 10K Ω
255Hz @ 47K Ω
500Hz crossover
white band
Low Pass
540Hz @ 10K Ω
460Hz @ 47K Ω
High Pass
625Hz @ 10K Ω
425Hz @ 47K Ω
1kHz crossover
light blue band
Low Pass
1.1kHz @ 10K Ω
920Hz @ 47K Ω
High Pass
1.25kHz @ 10K Ω
850Hz @ 47K Ω
2.5kHz crossover
light green band
Low Pass
2.7kHz @ 10K Ω
2.3kHz @ 47K Ω
High Pass
3.13kHz @ 10K Ω
2.13kHz @ 47K Ω
3.5kHz crossover
gray band
Low Pass
3.78kHz @ 10K Ω
3.22kHz @ 47K Ω
High Pass
4.37kHz @ 10K Ω
2.98kHz @ 47K Ω
6.5kHz crossover
orange band
Low Pass
7kHz @ 10K Ω
5.98kHz @ 47K Ω
High Pass
8.12kHz @ 10K Ω
5.5kHz @ 47K Ω
How to read this: the color ring indicates the Harrison Labs standard crossover frequency at the −3dB point, standardized at 22K ohms. Expect an 8% (LP) / 25% (HP) increase at 10K ohms, and an 8% (LP) / 15% (HP) decrease at 47K ohms.
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