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F-MOD crossover - good idea?

Discussion in 'Audio & Video' started by KRich, Feb 24, 2009.

  1. Feb 24, 2009 at 1:23 AM
    #1
    KRich

    KRich [OP] Well-Known Member

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    Hi all,

    Recently added an amp to my 6-disc non-JBL system using a LOC off the front speaker inputs. I am using the amp to drive a pair of Alpine SPR-17S components in my front doors. The frequency response of these speakers is 65Hz - 27kHz but the built in HPF of my amp (Kenwood KAC-7201) cuts everything below 150 HZ off. I am thinking of purchasing a pair of the Harrison Labs F-MODs 70Hz HPF crossovers http://www.crutchfield.com/p_069900075/F-MODS-70-Hz-high-pass.html?search=F-MOD&tp=117
    I will put these on the RCAs before they go into the amp and am hoping that this will allow me to get the full "safe" potential out of my speakers without having to turn the bass right down on the factory HU. Anyone have any thoughts or input? Thanks!
     
  2. Feb 25, 2009 at 12:04 AM
    #2
    Mr Marv

    Mr Marv 1-831-383-0308 Vendor

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    Safe? Yes, "full potential"? Only if 70hz at 12db just happens to be the ideal crossover point and slope for your specific application however the only way to know that is if you have other crossover points/slopes to compare it to!
     
  3. Feb 25, 2009 at 1:58 AM
    #3
    KRich

    KRich [OP] Well-Known Member

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    Thanks for your reply Marv! I've seen a lot of your posts around here and used one of your guides for putting my front speakers in. I am not sure if the 70 Hz FMODS will be right for my application but I do like the ease of them as compared to putting an active crossover in. I'm really hoping to hear from someone who has tried them but most likely I will end up just having to try them myself.
     
  4. Feb 25, 2009 at 10:41 AM
    #4
    Mr Marv

    Mr Marv 1-831-383-0308 Vendor

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    You're welcome and glad you found something I posted useful! I have used these for folks who didn't want to go to the trouble of an active crossover and they work fine for protecting the speakers. Acoustic wise however there really is no way to tell if they will be "perfect" for your system but I'd say go ahead and try them since they aren't that costly. If you'd like, once you get them in give me a call and I'll be happy to guide you through a couple of "tricks of the trade" to help you get the most out of them! :)
     
  5. Feb 25, 2009 at 1:13 PM
    #5
    KRich

    KRich [OP] Well-Known Member

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    Good to hear that you have actually seen them in action. My situation is that I do eventually plan to put a sub in the truck but not for awhile. I would like to get as much bass out of these speakers (without losing all the mids and highs of course) as I can without hurting them. My next upgrade will most likely be the head unit, the one I am looking at (Alpine W505) has a built in HPF but the closest setting that would work for me is at 80 Hz. If these FMODs worked well, I would consider leaving them in even after I possibly got this head unit so I could continue to get the lower frequencies. In your experience, did the FMODs affect the sound in a negative way? Do you think I would notice a big change in the sound from what I have now? Sorry for all the questions, I will definitely take you up on your offer to give you a call if I do get them.
     
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