low pass filter

millerman 3732
millerman 3732 Posts: 1,488
edited July 2005 in Basic Hookup/Wiring Questions
i have a kilpch ksw 15 it has a low pass filter the goes from 40hz to 120 hz where should i set the low pass filter and will it make any differance i cant seem to tell also the the low pass on my receiver is set to 80 hz what should i do
Casey
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Post edited by millerman 3732 on
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Comments

  • Mike682
    Mike682 Posts: 2,074
    edited July 2005
    Check your receiver manual for the cutoff. If it doesn't say it in the spec, check in the bass management, sub out section, or under calibration
    Receiver: harmankardon AVR235
    Mains: polk R30
    Center: polk CSi3
    Rear Surrounds: polk R20
    Subwoofer: polk PSW404
    DVD: Panasonic DVD-S29
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  • MaxxuM
    MaxxuM Posts: 31
    edited July 2005
    Like Mike stated, the manual will greatly aid you in setup of your receiver and speakers.

    “Where you should set it” however is an entirely different matter as most of us have to find that sweet spot for ourselves. If your receiver allows you to set a filter (crossover) for the sub you should disable that and just allow the sub to set its own frequency (for you to manually adjust). A good starting point on where to set your subs crossover (40-120) is the same crossover point you set your main speakers to. For instance, if all your speakers have frequency responses from say 50Hz-20kHz a good starting point would be to set their crossovers in the receiver setup for Center, L/R, Surround L/R at 60Hz (so they don’t try to play anything lower than that) – notice how I added 10Hz; its just a margin for error. After that you should use a Sound Level Meter from Radio Shack and the receivers test tones to calibrate your system. But read your manuals completely as it will probably explain in much more detail how to accomplish this.
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  • John K.
    John K. Posts: 822
    edited July 2005
    Miller, since you say that your receiver is doing a 80Hz low-pass to the sub, that means that it's handling the bass management duties and that the sub's internal crossover isn't needed in most cases and might just interfere with the receiver's crossover. Your KSW-15 has an LFE input which should be used and which then completely bypasses the internal sub crossover. If you've already got the sub output on your receiver connected to the sub's LFE input, that might explain why you can't tell any difference when you change the crossover setting on the sub; it's been bypassed and doesn't do anything.
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