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    Bass blocker cut off frequency help

    Hello. I am a complete newbie to car audio, but basically im replacing my stock toyota avalon speakers with Alpine SPS-10C2 (only 4" in the front and back) and im also adding a Kenwood KSC-SW1 compact subwoofer (I realize that this wont add earth-shattering base, but I just want some bass for a cheap price without taking up space in my trunk)..

    my question is basically, do i need bass blockers for my four alpine speakers?? (Im pretty sure my alpine speakers dont have a crossover and I don't want them to pop when im listening to music with heavy bass)..

    secondly, if i do get bass blockers (which im pretty sure i will considering the speaker size is only 4" in the front and back)..what should the cutoff frequency be for them? Crutchfield advises to get 600Hz for 4" speakers..but I think thats way too high. I was thinking of getting 300Hz for the front and 150Hz for the back (only bc the kenwood subwoofer frequency range is only up to 150Hz, and that's the reason I didnt want to get 300Hz bass blockers for the back, bc then it seems to me that I wouldnt hear any frequencies between 150-300Hz)..

    do you guys agree? or should i do 150Hz bass blockers for both front and back? or 300Hz for both front and back? or something totally different? any input is appreciated.

    these were the bass blockers i was looking at:

    http://www.crutchfield.com/S-juvrNFH...A2&cc=01&g=761

    Thanks!







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    Re: Bass blocker cut off frequency help

    are you running this off of a factory deck? if not, most HU's have HPF on them. If not, I would cut off safely at around 200, remember, in frequencies, it isn't a sharp "oh no frequencies below 200 will play" type of thing. The frequencies will still play, just at a reduced volume. I would do them at 200.



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    Re: Bass blocker cut off frequency help

    Thanks for the response starkfu. I am running the speakers off a factory deck. Ill take ur advice and buy bass blockers that have a cutoff at 200Hz (I knew 600Hz sounded alittle too high).

    Thanks again!




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    Re: Bass blocker cut off frequency help

    no problem.



    - IF you are going to do it..... do it RIGHT the first time.
    - IF you have a question on what product to buy - buy alpine

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    • KCE-300BT
    • TR-7 video bypass
    • peswiakjc
    • SBS-05DC
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    Re: Bass blocker cut off frequency help

    at 6db/octave rolloff, 600hz is a better option. That is NOT a sleep roll off, even with 600hz bass blockers, the 4" speakers are going to be noticibly playing down to 80-100hz. I would say 200 with a 6db/oct rolloff is going to KILL those 4"ers playing any bass heavy songs. Just for reference I have my 6.5" crossed at 160hz 12db/oct and they still are at almost full excursion during very bass heavy songs at full volume...

    I really recommend at least 300. Or, for $10 more buy both 150 and 600 and see which one's do better




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    Re: Bass blocker cut off frequency help

    he is running the factory deck..... with 4 4", at that level of crossover, it won't even reach 200hz @6db/octave. I think 300 is conservative for his application, 200 being the better choice. otherwise you are missing out on a large range of sound. Assuming the sub is crossed at 80-100hz.



    - IF you are going to do it..... do it RIGHT the first time.
    - IF you have a question on what product to buy - buy alpine

    '07 explorer (W.I.P.)(all alpine at the moment)
    • IVA-D105
    • KCE-300BT
    • TR-7 video bypass
    • peswiakjc
    • SBS-05DC
    • PKG-RSE2

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    Re: Bass blocker cut off frequency help

    I've seen the bass blockers blow the outputs in decks before and they were hooked up properly....




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    Re: Bass blocker cut off frequency help

    Quote Originally Posted by starkfu View Post
    he is running the factory deck..... with 4 4", at that level of crossover, it won't even reach 200hz @6db/octave. I think 300 is conservative for his application, 200 being the better choice. otherwise you are missing out on a large range of sound. Assuming the sub is crossed at 80-100hz.
    That's assuming the stock deck has a xover, and not just a bass blocker on the stock speakers with full range signal. If it does have a xover, then yeah, i agree 200hz would be fine. I just rather not assume that




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    Re: Bass blocker cut off frequency help

    Thanks for all the responses guys. This forum has been really helpful. So I guess if I have a "xover" (Im not sure what that is) on my stock head unit, then 200Hz is fine. If not, then I should go with 600Hz. The problem is, does anyone know any website or resource where I can find out if I have a xover or not? I guess if I can't find out or no one knows, Ill just play it safe and go with the 600Hz bass blockers.

    Thanks alot guys!




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