PCB XLR Fmod ™ Low Pass Filters (platinum Edition)
$82.50
Low Pass Frequency Range Options
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Please Select Connector Option
Please Select Channel Option (2 units Required for Balanced Stereo System)
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PCB XLR Fmod ™ Low Pass Filters (platinum Edition)
Product Details
🇺🇸 MADE IN THE USA 🇺🇸
Harrison Labs Parametric XLR FMOD Patch Board | Balanced Audio Crossover
Standardized at 22K ohms and a -3db frequency point.
Note: Two boards are required for a balanced stereo system to prevent signal loss and ensure proper balance.
The Harrison Labs Parametric XLR FMOD Patch Board is a professional-grade, balanced signal interface designed for precision frequency management. Engineered for high-performance audio environments, this board allows for the seamless integration of passive FMOD filters into an XLR signal path without the need for external power or active electronics.
High-Performance Audio Engineering
• True Balanced Architecture: Built with professional XLR inputs and outputs to ensure maximum noise rejection and signal integrity. Because each board manages a single balanced channel, two units are necessary for full stereo applications.
• Passive Signal Processing: Features dedicated sockets for FMOD modules, providing clean, hiss-free crossover and filtering with zero added distortion or electronic floor noise.
• Modular Tuning: Offers the flexibility to instantly swap or combine different FMOD frequencies, allowing you to customize your system’s response for specific acoustic environments or speaker configurations.
• Durable Routing Hub: Functions as a rugged patch point for distributing filtered signals to multiple amplifiers or components from a single, centralized location.
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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