dual sub setup

ilikesound
ilikesound Posts: 355
edited March 2007 in Subwoofer Hookup & Bass Management
i have two martin logan dynamo's hooked up to my receiver's LFE input (obviously). one is running directly from the output LFE from the AVR, and the other sub is running sub out from the main sub. my question is this: is the onboard crossover on the subs rendered useless seeing as how the processor's internal crossover is now in place? will the onboard frequency adjustment work, or just double the frequency it is being crossed over at?
At Home:
Panasonic 42'' TC-L42U12 LCD
Pioneer VSX-80TXV
Toshiba HD-XA2
Sony PS3 - psn "metalguitars"
Xbox 360 - gamertag "giggidygiggidy"
Panamax 4300EX
Polk RTi8's
Polk CSi3's
Polk FXi3's. (x2)
Martin Logan Dynamo (x2)
Audioquest interconnects and wires.

Away From Home:
JVC HDR-50
stock system in new car for now:(
Post edited by ilikesound on
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Comments

  • Systems
    Systems Posts: 14,873
    edited March 2007
    Does the ML have a bypass switch?If it does you can disconnect the sub's internal crossover leaving only the AVR's.If it does not have a bypass mode then the two crossovers will be in series.The adjustments will work but the actual slope will be the sum of both.
    Testing
    Testing
    Testing
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  • liordra
    liordra Posts: 152
    edited March 2007
    The sub does not have an "onboard cross Over" , rather it has a low pass filter. If you connect the first sub AVR LFE out -> SUB1 LEF IN, then the low pass filter in not active. ("rendered useless"), if you want to connect a second Dynamo , then your Connection is SUB1 SUB OUT -> SUB2 LFE IN, then the second Dynamo's low pass filter is not active as well.

    To sum up
    in your your configuraiton:
    AVR LFE out ----> SUB1 LFE in , SUB1 out
    > SUB2 LFE in.
    the low pass filter on both subs is not being used, and the AVR handles all the bass processing. (which I think is good)

    PS
    I realy like your Dynamos, congrats :)
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  • Systems
    Systems Posts: 14,873
    edited March 2007
    liordra wrote:
    The sub does not have an "onboard cross Over" , rather it has a low pass filter.

    A low pass filter Is essentially a crossover if only one half.
    And the Sub1 LFE input is exactly what I meant by bypass mode.
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  • ilikesound
    ilikesound Posts: 355
    edited March 2007
    GV#27 wrote:
    Does the ML have a bypass switch?If it does you can disconnect the sub's internal crossover leaving only the AVR's.If it does not have a bypass mode then the two crossovers will be in series.The adjustments will work but the actual slope will be the sum of both.

    meaning the reciever AND the subs? or just both subs?
    At Home:
    Panasonic 42'' TC-L42U12 LCD
    Pioneer VSX-80TXV
    Toshiba HD-XA2
    Sony PS3 - psn "metalguitars"
    Xbox 360 - gamertag "giggidygiggidy"
    Panamax 4300EX
    Polk RTi8's
    Polk CSi3's
    Polk FXi3's. (x2)
    Martin Logan Dynamo (x2)
    Audioquest interconnects and wires.

    Away From Home:
    JVC HDR-50
    stock system in new car for now:(
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  • Systems
    Systems Posts: 14,873
    edited March 2007
    ilikesound wrote:
    meaning the reciever AND the subs? or just both subs?
    Not sure what you are asking but I will try to clarify.
    If you connect the LFE output of your reciever to the LFE input on the subs then ONLY the recievers crossover (or low pass filter) is in use.Connecting to the LFE input on the sub bypasses it's internal crossover.
    Testing
    Testing
    Testing
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