Manuals & Resources

Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA

FMODs™ feature a 12 dB per octave crossover slope and are compatible with all RCA type input amps. Sold in pairs.
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Part # 266-250

Product Details

Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA

What is an FMOD™? The FMOD™ is an active crossover simulator. It is better than a much more expensive electronic crossover that requires power to operate. FMODs™ are packaged in pairs and can be combined with other FMODs™ to obtain bandpass ranges or with other types of crossovers to change the slope and crossover frequency point. FMODs™ feature a 12 dB per octave crossover slope and are compatible with all RCA type input amps...simply place the FMOD™ in-line with the patch cable running between the source (head unit) and the amplifier. 24kt gold over brass construction, 10 volts maximum RMS input. One-year manfacturer warranty. Made in the U.S.A.

Product Specifications
  • Crossover TypeLow Pass
  • ConfigurationInline Line Level
Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA
  • BrandHarrison Labs
  • Part Number266-250
  • UPC844632053139
  • Product CategoryIn-Line Crossovers
  • Unit of MeasurePR
  • Product Rating
    (5 Reviews)
  • Weight0.0908 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA
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Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA
Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA is rated 4.8 out of 5 by 5.
Rated 5 out of 5 by from Works as advertisedHave the 50Hz low pass on my sub. The gradual slope makes the sub blend well with the main speakers, IMO. Let me clear up one mystery: these are directional. There is some debate whether these are directional or not, and they are. Flipping them over and plugging them in to the preamp output changed the sound quality negatively. The male side should face down stream at the end of your interconnects.
Date published: 2015-03-24
Rated 5 out of 5 by from WorksBought the 50’s and 70’s – taking out the honkieness from my added subwoofer on my car. Though tough the amp had a low-pass, it was preset at 120Hz, way too high allowing too much mid bass. Went with the 50’s – much happier now.
Date published: 2013-12-09
Rated 5 out of 5 by from Great productGood price and fast shipping. will buy again.
Date published: 2009-08-19
Rated 5 out of 5 by from These are a MUST OWN for anyone with bass shakers!Since these come as a pair, I doubled them up and now they do an amazing job at filtering out all the unwanted shake during movies. After installing these I can crank up the bass shakers and now they only come on during the high tension/ high action parts of movies. 5 STAR Product all around and 5 star service from Parts Express!
Date published: 2009-02-23
Rated 4 out of 5 by from Best solution for the costCut out 70-80% of what I wanted, maybe more. Some of the higher frequencies are still there, just considerably lower volume and very muddled. Helped me turn my three-way cabinet into a subwoofer only. For the money, it was the best way to go.
Date published: 2008-04-21
  • 2015-11-27T06:27CST
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  • cp_1, bvpage1
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  • loc_en_US, sid_266-250, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

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Harrison Labs FMOD Inline Crossover Pair 50 Hz Low Pass RCA

I currently have the 50Hz low pass on my subs. If I add 50Hz high pass on my mains, will that create a smooth crossover? Or should I try 30Hz high pass? Do the high pass ones affect the sound at all? I don't want to decrease the clarity of my system.

Asked by: KBob
The actual effect will really depend on the speakers in room response, but I think I would go with the 50 Hz high pass over the 30 Hz, I usually try and keep the crossover points consistent.
Answered by: Chrisf
Date published: 2015-04-02

How are these oriented?  Does it matter?  Is the input the female end, and the output the male end?  Or the other way around?  I may need a gender changer depending on how this hooks up.

Asked by: compaudiopro
In my experience the orientation matters. They are directional. Input is female end so that they are on the end of the interconnects going to the subwoofer amp. I tried flipping them over and plugging them to the output of my pre but that destroyed the soundstage and degraded the sound quality due to too much hf going to the sub.
Answered by: KBob
Date published: 2015-03-24

How does it work using them with a 1-to-2 Y-cable?

If I use a mono-to-stereo RCA cable and put one FMOD each on the L/R stereo ends, is that the same as stacking 2 end-to-end, doubling the slope to 24dB/octave? Thanks in advance!
Asked by: SamH
Unfortunately no, the FMODs much be stacked in order for the slope to increase.
Answered by: MattP
Date published: 2013-06-11

if i use 2 f mods 50hrz low pass together will it now become 25hrz?

Asked by: raymondeast
No, I believe 1 F-Mod has a 12db per Octave slope, if you use 2, it will still be 50hz, but it will be at a 24db per Octave slope.
Answered by: Rickskal
Date published: 2014-12-29
  • 2015-11-27T06:51CST
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  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_4
  • loc_en_US, sid_266-250, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational
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