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Reload Thread: Anyone fancy helping me - Hertz ML2500 10"

  1. #46
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    The sealed ML2500 way back in an FG box in my A4 Avant




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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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  3. #47
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    keep_hope_alive is offline Acoustics Engineer keep_hope_alive is a Supporting Member of the forum!



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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Keep in mind the $900 ML is being replaced with. $250 SXX. Output capability and overall performance suffer.

    Rich V.



    got a question? shoot me a PM. Matthew 6:9-15 - YouTube Channel: https://www.youtube.com/channel/UCkYUo2EShW9lgtrfXiDvLNQ/videos
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    Anyone fancy helping me - Hertz ML2500 10"

    True, the Hertz is a truly quality bit of kit. In the 0.5cu ft sealed box it really shone and kept my trunk space open for my bike and kids stuff.

    However, being SVC 4ohm it was at its limit and my amps limit in the new car I have more space and I wanted to be able to get down to <2ohm to get the most out of the KAC9104D



    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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    Re: Anyone fancy helping me - Hertz ML2500 10"

    It is for sale locally and at only 90 I have local Chavs wanting to give me 50 for it like the rest of the cheap crap on Craigslist


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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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    Anyone fancy helping me - Hertz ML2500 10"

    Box is out and under re-construction.

    With the internal port out the volume is back up to about 34 L (1.2 cuft)

    Got a new 4 post terminal plate, flushed it into the side
    Soldered on the '8ga' power wire on, it's the same thickness as the new 12ga speaker wire


    Made the new external port, tune is about 35Hz




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    Last edited by Alex JB; 12-23-2016 at 02:35 PM.



    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Port on, put it in the car and made a cardboard template of the baffle.




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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

  8. #52
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Neat!

    Sent from my SGH-T999 using Tapatalk



    Gain on an amplifier to meant to be matched to the output voltage of your headunit. Think 3 volt, 4 volt, 5 volt pre out specs you see on headunit specs. This is how gain works for a given pre out(5 volt) theoretically. However most head units clip(start to distort) at around 80% of your volume so your 5 volt pre out wont give 5 volts Cleanly. You will most likely get 4 volts out at something like 33/40 on your volume knob and would thus set your gain to 4 volts. (these things can be measured with a GOOD Multimeter. )
    80% of your total volume is (max volume) X 0.8.
    Example is 40(is your max volume so, 40 X .8=32


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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Some paint and sub back in, merry Christmas to me!




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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

  10. #54
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Some of the weirdest enclosures I've ever seen. Looks kinda small for that 12.



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    Re: Anyone fancy helping me - Hertz ML2500 10"

    It is a little, Re spec is 1.5cuft net for the 'compact' design and I'm more like 1.2

    I will run it for a while like this, will be wired to 1ohm so amp spec is 900rms, no idea if it will actually do close to that.
    Will see how the SXX and the amp (KAC9104D) play together.
    I may have access to a Massive Audio P1500.1D if I do get hold of it I will see how that sounds, if it seems worth it I may then build another box with Re's other recommend size 1.9cuft net


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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

  12. #56
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Box is in and the 12ga speaker wire is crimped up and in too.





    Sent from my iPhone using Tapatalk



    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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    Re: Anyone fancy helping me - Hertz ML2500 10"

    First 1/2 hour out in the car with no kids...
    The box is much flatter through the lows now, it feels louder and the (admittedly poor) IPhone dB meter has it up from 122 to 124.3 on the same extended note in the same track as before.

    The plot from the box calculator app is in agreement, getting the 3L back and tuning a bit lower flattens it out.


    I have also wired each VC to the speaker outs on the amp as the diagram below, I'm not sure if it's now loading the amp to 2ohm or 1ohm?




    Sent from my iPhone using Tapatalk



    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Should I bridge +ve to +ve and -ve to -ve to make sure it's parallel and presenting a 1ohm load?


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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Is sub d2?



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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Yes Re SXX 12" D2


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    JL 6.5's in the front doors
    AP1040 bridged driving them.
    2 Sundown E8's in 1.1cu ft tuned to 30Hz.
    700rms @ 2Ohm Cadence... let's see what the the E8's can take

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