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Type: Posts; User: Jethro

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  1. Replies
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    If you use thick enough plexi, it won't be a...

    If you use thick enough plexi, it won't be a problem. But there's a reason why plexi 'windows' are so often done -- less flex from a smaller panel.

    Regarding side-firing, it should not be a...
  2. Thread: Sub Sugestions

    by Jethro
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    6,194

    Well if you don't want our advice, then what the...

    Well if you don't want our advice, then what the heck are you doing asking questions on an internet forum? Really, that makes absolutely no sense.

    If Crutchfield has all the answers, then what do...
  3. Thread: Sub Sugestions

    by Jethro
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    6,194

    A few things... 1. Smaller drivers DO NOT...

    A few things...

    1. Smaller drivers DO NOT automatically equate to tighter bass.
    2. Crutchfield = not really experts.

    If you are set on a 10" Polk, I'd suggest either a single SR104-DVC or a...
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    Qts is a very good indicator of what type of...

    Qts is a very good indicator of what type of enclosure a particular driver is best suited for. I always look at EBP in addition to Qts, just so I have more than one indicator.

    A ported enclosure...
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    6,742

    I'm still trying to figure what high mass has to...

    I'm still trying to figure what high mass has to do with whether or not a driver is suitable for a ported enclosure. I can see that it would be an issue below tuning, without the use of an SSF... but...
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    That is a difference of ~3.4% -- not enough to...

    That is a difference of ~3.4% -- not enough to even worry about. The T/S parameters on a production run of subs will vary more than that from driver to driver, I guarantee it.
  7. Thread: brrrrrrr

    by Jethro
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    1,971

    If this sound only happens at high volume, it is...

    If this sound only happens at high volume, it is most likely clipping. Find a song that does it, and then turn it down a few notches while it's doing it to see if it stops.

    Have you done any...
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    Try bridging the amp to 2 channel (using the SR...

    Try bridging the amp to 2 channel (using the SR x-overs) instead of biamping... that may make a difference.
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    1,470

    Do not look at 'MAX' or 'PEAK' specs, as they are...

    Do not look at 'MAX' or 'PEAK' specs, as they are meaningless.

    If your low-pass filter is set correctly, you will not hear any difference between 'stereo bass' and mono bass. Wiring your subs in...
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    The easy, and correct, thing to do is just buy...

    The easy, and correct, thing to do is just buy amplifiers that were meant to be plugged into your wall outlet.

    I have a 40 amp (50 amp peak) Zurich power supply ($200 shipped) on my test bench,...
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    Going with a box that small will likely...

    Going with a box that small will likely over-emphasize the upper bass frequencies while limiting low frequency performance. It will handle a ton of power mechanically in that small of a box, but at...
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    1,164

    Sealed boxes do not have 'tuning frequencies'...

    Sealed boxes do not have 'tuning frequencies' like ported boxes do. All subwoofer systems (woofer + enclosure) have 'resonant' frequencies, but is not something you necessarily need to tune.

    If...
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    1,740

    Just to nitpick a little here... while polyfill...

    Just to nitpick a little here... while polyfill can help improve the sonics of an undersized sealed enclosure, it will do absolutely nothing to reduce standing waves in a typical car audio subwoofer...
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    If you get an amp that does 1500 @ 4-ohms, make...

    If you get an amp that does 1500 @ 4-ohms, make sure you get the SR104-DVC's and wire the voice coils in a series/parallel configuration.
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    How much power are you going to be running?...

    How much power are you going to be running? Mechanical power handling is dependent on box volume, so plan your box accordingly. With a 24 liter box, 700 watts will put you right at the driver's...
  16. Thread: Sr124 Dvc

    by Jethro
    Replies
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    2,693

    Clipping should not be confused with the sound...

    Clipping should not be confused with the sound 'cutting out abruptly' -- they are not the same thing. A small amount of clipping can be hard to detect, but extreme clipping will make your sub sound...
  17. Thread: amp questions

    by Jethro
    Replies
    74
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    3,876

    It depends on the amp. If the amp only has one...

    It depends on the amp. If the amp only has one set of outputs, then you will hook it up as you described above (called wiring in parallel). If it is a mono amp with two sets of outputs, then you can...
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    I would second that statement 100%. It's just not...

    I would second that statement 100%. It's just not a good idea to mix different drivers - whether it is different models, different sizes, different impedances, different VC configs, etc.
  19. Thread: extra midrange

    by Jethro
    Replies
    4
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    901

    Where do you have your woofers and tweeters...

    Where do you have your woofers and tweeters mounted? If they are far apart, you may also want to try the "midrange extension" switch to see if that helps.

    If the tweeters are mounted in the dash...
  20. Thread: extra midrange

    by Jethro
    Replies
    4
    Views
    901

    Adding a midrange will likely cause more problems...

    Adding a midrange will likely cause more problems than it solves. Even if you could find an exact match to the MM6 midbasses, you would have to either build your own low-pass filter for them, or try...
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    If you go too large, then yes, power handling...

    If you go too large, then yes, power handling will be decreased to a point that SQ will suffer due to over-excursion (typically with Qtc's lower than .577, depending on the driver). But, enclosure...
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    That statement is not totally correct (with...

    That statement is not totally correct (with regard to sealed boxes, anyway). A sub with tight bass typically has excellent transient response without a lot of overhang or ringing. This is usually...
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    Hey, look at that; a little searching and I find...

    Hey, look at that; a little searching and I find what I'm looking for. Sorry if I wasted any of your time.

    Driver Complement
    Woofer 1 - 12" Diameter (30.48cm)
    Concave, Aluminum-clad,...
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    3,345

    Fair enough. It was just a suggestion. I am sorry...

    Fair enough. It was just a suggestion. I am sorry if I confused you at all by using terminology that you were not familiar with.

    Here is a site that explains Qtc:
    Sealed Speaker Enclosure Design...
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    3,345

    My response was directed at this part of the...

    My response was directed at this part of the original post:



    I was offering advice on how to get the best possible SQ out of his system. Your suggestion of replacing a very capable JL driver...
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