Contact us
Close contact box
Connect ID #
319 028 616 3
Connect ID #
319 028 616 3
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

Our contact center is currently closed.

Please enter your name.  
Please enter a valid email address. Why is this required?
Please enter your US phone number.  

For Tech Support, call 1-888-292-2575

Thank you, !
Our conversation will be emailed to
Chat Advisor Image

Your Advisor,

More about me
Please enter a question  
Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  

Please enter a message  

Calls may be recorded for training and quality control purposes.

We are located in Virginia USA.


In-line crossovers (70 Hz low-pass)

Item # 069900061

Discontinued item

Item # 069900061

About the F-MODS

Simply plug F-MODS crossovers in-line with the patch cords feeding your amplifier. They filter out unwanted frequencies, with a 12 dB per octave slope. Low-pass models let frequencies below the cut-off point through and filter out the highs. High-pass models let frequencies above the cut-off point through and filter out the lows.

What's in the box:

  • 1 Pair of F-Mod crossovers (70 Hz Low Pass)
MFR #900061

Customer reviews

Loading reviews...

F-MODS reviews

Average review:

8 reviews

Thanks for submitting your review

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee purchase (What's this?)



Crutchfield response

<< >>

More details on the F-MODS

Mark G.

Product Research


Overview: The F-Mod (filter module) is an active crossover simulator, made by Harrison Laboratory, that connects in-line with your RCA patch cords. They require no power, and can be combined with other types of crossovers to change the slope and crossover frequency point. F-Mods have virtually no noise or distortion, and do not cause turn-on thumps. F-Mods can handle a maximum signal of 10 volts RMS, and have a slope of 12dB per octave.

Construction: The F-Mod is made of brass with 24 kt gold plating.

Color Codes: The manufacturer's label is silkscreened on the barrel of the device in two colors. A red label indicates a high pass filter, while black indicates a low pass filter. A colored ring near the male RCA end of the barrel indicates the frequency of the filter (-3dB). There is a frequency increase at 10K ohms (8% Low-pass, 25% High-pass) and a frequency decrease (8% Low-pass, 15% High Pass) at a 47K ohm load. A high-pass F-Mod and a low-pass F-Mod can be combined for bandpass operation.

Frequency Codes: The available F-Mods frequencies are:

Frequency Band Color Frequency (Low Pass) Frequency (High Pass)
@10K @47K @10K @47K
50 Hz Brown 54 Hz 46 Hz 62 Hz 43 Hz
70 Hz Purple 76 Hz 65 Hz 87 Hz 60 Hz
100 Hz No Band 108 Hz 92 Hz 125 Hz 85 Hz
200 Hz Blue 216 Hz 184 Hz 250 Hz 170 Hz
500 Hz White 540 Hz 460 Hz 625 Hz 425 Hz

Loading accessories...

Customer Q&A

Loading articles...