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

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    Re: Anyone fancy helping me - Hertz ML2500 10"

    DEFINITELY need to load it against something. You'll get much better output with it closer to the trunk lid.

    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"

    It's in the car now.
    It's definitely extending the <50hz stuff, as you would expect going from 15L sealed to 25L ported.
    The punch has suffered a little, but this may be that the continuous tones are louder.
    I played with a signal generator and the peak seems to be more 35-40hz compared to around 50 before.

    I will try pulling the box to the back of the trunk space to load it, if it really helps I may have to consider doing something different.
    I really need it to go in the dead space of the trunk, so I may have to face the sub into the back of the seat to load it


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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"



    Left is trunk lid. right is opening into cabin. You can gain alot cleaner sounding bass by facing the sub into the cabin and sealing it off completely, But only by sealing it off completely will you get it. Otherwise, you introdoce cancellation issues.



    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"



    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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    Anyone fancy helping me - Hertz ML2500 10"

    Is it worth actually adding a loading pannel?
    My side profile sketch is p1ss poor but maybe you get the gist.



    The fixed parcel shelf has the OEM sub in it and on the other side a big hole so that's the best passage into the car.
    The seat backs fit snug and there is no ski hatch

    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"

    Plans have changed.
    I came across a deal for a RE SXX 12 that I couldn't refuse so the Hertz is out.




    As my amp is 500rms (only a value from the manual) @ 4 ohm and 900 at 2 ohm and >900 at 1ohm, I wanted to go to a DCV and get more out of it.
    The SXX is dual 2, currently wired to 4 ohm at exactly the same settings it's a lot cleaner than the Hertz.
    Will be going down to 1 ohm after a few days listening.


    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"

    The box designer app spat out a suggested box size of over 79 litres for the SXX 12,
    Re recommended is 45 L
    I don't have 80 L, but if I take out the internal port and the MDF that was recessing the 10 back from the baffle then I will be back up to 34 L net.
    Throwing 34 L in the app and comparing it to the 80 L it suggests, looks terrible below 60Hz.
    Is there any way to make a compromise with the external port?




    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

  8. #38
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    New RE stuff is junk.


    Ask us for suggestions instead of keep buying subs.



    97 4 dr. Tahoe
    Optima redtop
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    Polk Audio MM6501 coming soon...
    Soundstream Rubicon 1.2500D & 4.500 amps
    2 Sundown Audio X 15's Tuned @ 30Hz.

  9. #39
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    If I add Re's recommended box size (43L) the calculator does look better than my tiny box (no surprise there) but it doesn't look like Re suggest in their tech sheet




    What calculator works on a win64 computer or iPhone that can give out believable curves so I can see what box and port size I can use to maximise the use of the space I have without just building the Re website cube it suggests?



    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"

    Don't use RE's calculator. Others' on here have pointed out they're way off.



    97 4 dr. Tahoe
    Optima redtop
    Alpine 9835
    Polk Audio MM6501 coming soon...
    Soundstream Rubicon 1.2500D & 4.500 amps
    2 Sundown Audio X 15's Tuned @ 30Hz.

  11. #41
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    What's up with liter and mm? We use cubic ft and inches in America. U should get a real box design and will be blown away. That box u built is is just crazy in all sense




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    Re: Anyone fancy helping me - Hertz ML2500 10"

    how much for the ML2500 if you're going RE?

    i've done a few sealed boxes for the ML2500 and I run a ML3000 sealed. I followed the mfr specs for the ML2500 with great results, corner loaded.

    your box design is neat for the for the application but i'd want a much larger port since the sub can move a lot of air.

    as mentioned, if you move that box into a rear corner (facing the corner) you'll hear a HUGE improvement in output. you built a neat box but it was destined to fail simply due to location.




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    Re: Anyone fancy helping me - Hertz ML2500 10"

    here are some locations i've tested with my ML3000. I started with a dual flared port and changed to sealed (same airspace). This increased Q from .7 to .85 which is still acceptable SQ.

    ranked best to worst (i compete in IASCA SQL with #1 )

    1.

    2.

    3.

    4.

    5.

    in the works:



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

    Quote Originally Posted by Hertz Mafia View Post
    What's up with liter and mm? We use cubic ft and inches in America. U should get a real box design and will be blown away. That box u built is is just crazy in all sense
    I used to live in Chicago and that's when I started to use this site, I've since moved back to UK and moved back to metric!
    Cu-ft is good to, I'll make sure I go imperial from now on


    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

  15. #45
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    Re: Anyone fancy helping me - Hertz ML2500 10"

    Quote Originally Posted by keep_hope_alive View Post
    here are some locations i've tested with my ML3000. I started with a dual flared port and changed to sealed (same airspace). This increased Q from .7 to .85 which is still acceptable SQ.
    Thanks for this fella, some nice work on the differing setups.

    ML2500 is for sale, but as I'm in the U.K., it's unlikely to be cost effective to get it to you if you are in the Lower 48.

    I can move the box a few inches forward and re-mount the Re 12 in the box facing the seat back.
    Doing this, would you face the port the same way or another direction?



    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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