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Thread: Stereo Integrity Dual HT18-v3 Build

  1. Back To Top    #1
    Noob Jdunk54nl's Avatar
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    Stereo Integrity Dual HT18-v3 Build

    I just finished my build of my stereo integrity HT18-v3's for my home so figured I'd share to give some inspiration to others.

    Edited to fix picture rotations

    Parts list:
    4cu ft flat packs from Parts Express that are technically made for the ultimax.
    SVS sound isolation feet
    R-30 Fiberglass Insulation to line the interior walls
    5lbs Acousti stuff from parts express (per box)
    Deluxe 1/4-20 tnuts from parts express (epoxied in place)
    Speaker gasket tape from parts express
    Landau Foam from local dealer
    White Vinyl from local dealer


    Help from two friends in covering the box!



    Flat Packs arrived
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    Laying out all of the pieces

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    Starting to glue them together

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    Getting SVS feet ready. They use the 1/4-20 tnuts as well.

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    More gluing

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    Sides being glued on
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    Silicone all of the seams to make sure no air leaks. Also siliconed the tnuts since the svs feet bolts were not long enough to go all the way through

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    Silicone Dry

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    I recessed some magnets in the front face on the backside in case I want to add magnetic grills in the future. I wish I would have purchased some stronger magnets for this. These are fairly weak and will require a much stronger magnet on the grill side to work properly.
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    Magnets epoxied in place.

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    I may have issues with excessive clamping...



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    Boxes all glued together
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    Last edited by Jdunk54nl; 11-29-2021 at 04:23 PM.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  2. Back To Top    #2
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    Breaking in and testing different things!

    Test fitting the subs. Unfortunately the flat pack and the SI gasket do not work well together. So I won't be using it and instead just putting some of the gasket tape on the top and bottom of the sub to give it a more finished look. I could have routed out a little more of the box, but figured I would just end up messing more up and it would have required me to buy a new circle jig since I don't have one that goes up to 18.5".

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    Testing placement

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    Last edited by Jdunk54nl; 11-29-2021 at 04:25 PM.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  3. Back To Top    #3
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    I decided to follow the loudspeaker design cookbook and test out some different fill materials.

    I tested the following:

    No fill
    Walmart Poly Fil 5lbs
    Acousta stuf 5lbs
    Sonic Barrier covering the side walls (not sticking because I didn't know if I wanted to use it or not)

    All Results (colors go with individual results below)
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    Close up results (microphone placed 6" away in all tests from center of cone)

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    Sub No Fil

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    Sub Walmart Poly Fil

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    Acousta Stuff

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    Sonic Barrier
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    My results were following the Loudspeaker design cookbook very well
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    So I ended up doing a combination of fiberglass to line the walls and the the acousta stuff to fill in the rest of the area
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    Last edited by Jdunk54nl; 11-29-2021 at 04:26 PM.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  4. Back To Top    #4
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    I also wanted to see if anything "broke in" on these subs.

    I measured them before, after 5 minutes, than after about 3 hours.

    There was something that broke in within the 5 minutes, but no changes after that. You can see the impedance curve shifted to the left a little bit and it stayed this way from every measurement here on out. I bet if I would have tested after 30 seconds, 1 minute, etc, this would have been "broken in')

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    Last edited by Jdunk54nl; 11-29-2021 at 04:27 PM.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  5. Back To Top    #5
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    Finally the finishing of the box in the white vinyl

    Thanks to Rick and Curt for their help in this process!


    Landau Foam covering all sidesAttachment 16540
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    Vinyl Cut and my sewing marks to follow as I sewed
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    Sewing machine
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    Close up of my stitch pattern for the back. The top only has a single stitch shown to make it look cleaner.
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    Bottom getting stretched and stapled
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    One Done
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    Close up of back of box
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    Feet on and some hide-it to hide the seem on the bottom
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    Both done and back in my garage
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    Testing sub fit

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    final placement of one (the other is similar on the other side)

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    Last edited by Jdunk54nl; 11-29-2021 at 04:41 PM.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  6. Back To Top    #6
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    Now I just need to run some REW and SMAART to properly integrate the subs with the mains.

    I have some buckeye amps that should be delivered right around Christmas coming. 6 channels of 502mp (for 5 main speakers and Voice of God speaker) and 4 channels of 252mp (for in ceiling speakers).

    I also have some Philharmonic Audio BMR towers for Left and right and a BMR for center ordered and should be in sometime in January. For surround/VOG I have Philharmonic Mini Monitors that he offered for one round. I luckily got the last 2 pairs of those.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  7. Back To Top    #7
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    I fixed the rotation issues and the final picture issues. I don't know why they weren't showing up and just said attachment with no attachment.
    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

  8. Back To Top    #8

    Re: Stereo Integrity Dual HT18-v3 Build

    Awesome build. Great job!!!

  9. Back To Top    #9

    Re: Stereo Integrity Dual HT18-v3 Build

    Those look awesome.
    I'm actually surprised at the quality of the PE kit, those are well designed.

    Good job following up not only with stuffing them, but following a perfect process to figure out which were worth a damn.
    I learned that Acousta-Stuff is measurably superior to polyfill - after all these years just using polyfill because I could buy it local and "it's all just blown poly fibers anyway"
    Are you sure you stuffed the same densities? That was interesting to see.

    And AWESOME job actually doing legitimate upholstery. I've personally never used sewing (or owned a sewing machine that could do vinyl or leather), but I suppose that led me to become a master of stretching over the years

    I seriously love the clean, professional look those have with the stitching around them.

    What was it that made the sub gasket not work? Were the cutouts undersized for your sub? Not that you need a gasket with the vinyl, provided you have a good surface-to-surface mating, anyway.

    Sent from my LM-G820 using Tapatalk

  10. Back To Top    #10
    Noob Jdunk54nl's Avatar
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    Re: Stereo Integrity Dual HT18-v3 Build

    The gasket was just slightly too big and I didn’t feel like routing it out. It would have required a bigger circle jig and some finesse to mount a board perfectly in the center.
    Click image for larger version. 

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    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

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