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Thread: Bought the Civic Hatch lease out, so rebooting the install thread

  1. Back To Top    #11

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    That's good to know - I only have used that foil tape on ducts and damn it sticks. This foil backing on the ccf is... Eh. It's so thin and feels more like plastic.

    I changed my mind on a strategy back there at any rate:
    I was hoping to avoid mass-loaded vinyl back there just for the weight savings, but... hatchback.

    It's shocking how much sound the compressed carpet of the factory hatch panels actually blocks - but I need more. MLV doesn't heat form well... and you can see the curves back there.

    So I'm still rubbing my chin. On the "research alternatives" list.


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  2. Back To Top    #12
    Noob BenevolentDictator's Avatar
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    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Those look great. I ordered a pair for my rear doors this past week so I'm anxiously awaiting them. You're far ahead of me on everything so I'm curious to hear your impressions of them.


    Quote Originally Posted by geolemon View Post
    A little speaker porn strip tease...

    First off, "four" seems like the right quantity to order these in. I received one full box, packed inside another box, nicely padded with Styrofoam chunks.


    Carrying these in from my porch - my first impression is "damn these are heavy!" It's impressive, but I'm glad they'll be low in my door because I like the handling of my light, fun car.


    You can see why - these are XBL^2 midbass drivers. The top plate needs to be thick, similar to an underhung driver, even - the only difference being there's a circumferencial deep groove circling the inside, changing the magnetic field... allowing BL to stay constant across huge excursion when paired with a voice coil of correct length.

    They took all interesting approach - machining two half-top-plates and stacking them (one inverted), to keep costs down. Smart.


    Going to set two up in little sealed test cabinets and park those on the floor roughly where my door speakers would be, for now.


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    Man cannot remake himself without suffering....for he is both the sculptor and the statue.

  3. Back To Top    #13

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Quote Originally Posted by BenevolentDictator View Post
    Those look great. I ordered a pair for my rear doors this past week so I'm anxiously awaiting them. You're far ahead of me on everything so I'm curious to hear your impressions of them.
    They are monsters - wait until you hold them - and be sure you prep those rear doors well!

    I mentioned some unusual circumstances (including that annual Rust Kote spray) that are leading me to the more difficult challenge of "enclosures"...
    Normally I'd take the route of sheet metal/self tappers (thin weatherstrip tape in the overlap), damping material and probably MLV... just seal the door cavity up.

    With drivers with such low-end potential, it would be a shame to not do that, see all the excursion - and not get the bass. Not that it's not a shame with lesser drivers too

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  4. Back To Top    #14
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    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Those anarchy's are decent drivers. more sub than mb though and I have one in a 25hz tapped horn (not in the car lol). They work "OK" in a door style IB setup but really want a small enclosure to perform.

    Unfortunately the RF of new is not the RF of old. I'm sure those amps will do just fine in your application and class D amps these days are way ahead of class D amps from the 90's. If you can't find the Helix amp/dsp combo, Arc Audio has a similar setup, with built in PS8 Pro and JL has a line of amps with their built in DSP as well. All three are excellent choices.

    I intend to do a similar mock up for my next project as well, and for pretty much the same reasons.
    MASQ partner and judge
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  5. Back To Top    #15

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Quote Originally Posted by pocket5s View Post
    Unfortunately the RF of new is not the RF of old. I'm sure those amps will do just fine in your application and class D amps these days are way ahead of class D amps from the 90's...
    I'm 100%with you in some ways.
    When I was managing an RF dealer in the '00s, they had just introduced the P1, P2, P3 subs - and had the audacity to bring cutaways to CES. It was an "emperor has no clothes" moment. All flash and money spent on the outside - no visible tech going on inside. This was back when XBL was pushing excursion and reducing distortion, and the JL W7 even affirmated the XBL approach by cross-drilling their pole piece.in the seems spot as the XBL groove for the same effect...
    And here's RF I swear using them to vet out buyers who don't know what they are looking at.
    I've been pretty actively disenfranchised (if that's a thing) ever since.

    But...
    They (to my knowledge) have always had some of the industry's top talent in amp engineers, who are still there today. I haven't seem their amp quality fall off. And if you see teardown videos of these, the engineers marks are printed into the PCBs - like design signatures. So - little clues that they still have the same amp engineers.

    I also have a little comfort buffer in that the RF amps not only have more rated power headroom as a buffer (100w per channel vs 75w of the Helix), but they significantly under-rate them still.
    So I'm speculating that if you normalized them both to 75w per channel via some conservative gain setting on the RF amps, I'd bet they'd be comparable in SQ also.

    But I'm equally confident in the Helix, also compact - waiting for a vendor to get back to me. RF I can get locally... Helix I can't.

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  6. Back To Top    #16
    Noob BenevolentDictator's Avatar
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    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Yeah I have a journey ahead of me. I was definitely planning to firm all four doors up as best as I can and go from there. I am hoping they are done the justice they deserve so my mids hammer.



    Quote Originally Posted by geolemon View Post
    They are monsters - wait until you hold them - and be sure you prep those rear doors well!

    I mentioned some unusual circumstances (including that annual Rust Kote spray) that are leading me to the more difficult challenge of "enclosures"...
    Normally I'd take the route of sheet metal/self tappers (thin weatherstrip tape in the overlap), damping material and probably MLV... just seal the door cavity up.

    With drivers with such low-end potential, it would be a shame to not do that, see all the excursion - and not get the bass. Not that it's not a shame with lesser drivers too

    Sent from my LM-G710 using Tapatalk
    Man cannot remake himself without suffering....for he is both the sculptor and the statue.

  7. Back To Top    #17

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Minor update:

    Took advantage of some Parts Express sales.

    Previously had ordered a UMM-6 for the basement PC.
    Can't pass that up for $69, and has its own calibration file, individual to this mic.



    I got that set up with the calibration file input into REW...
    ...then realized I didn't have a headphone-to-RCA cable long enough to reach from my PC to the Yamaha tuner I'm using to power my setup for this testing.
    So... One of those is headed my way now.

    Today, this box of goods showed up - even added an extra hunk of braided sheithing to get me to the $100 free shipping mark.



    Six passive filters in this box-
    Two 500hz high pass
    Two 500hz low pass

    I'm hoping I'll be able to run lower points than this, but this was the only prebuilt option and it would cost more time and money to build filters... to what frequency? Would be a total guess, and this will be fine for my playing with image placement.

    But for the hell of it, even though they don't sell corresponding low-pass, I picked up two 300hz high pass filters to see if I can extend that low.



    In car, I'll have a DSP and infinite flexibility on filters, so these are just to get a reasonable mock-up for experimenting.


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  8. Back To Top    #18

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Couldn't help myself, so I mounted and wired things up before dinner.

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  9. Back To Top    #19

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    Some construction progress. Two steps forward, one step back (and I don't mean with my fiancee who surely will have some questions for me on this beauty in our basement ...

    The good - success building side window frames to give the right angle and hold some plastic at a curve that simulates the curve and angle of car windows.



    The bad - I tried to get off cheap with a florescent light panel, which is textured on one side and glassy smooth on the other. I need the smooth side for the inside - to be acoustically reflective. And it's not going to work out because I impulse bought at a Lowes run without thinking it through - and cutting and rotating leaves me with... two right windows. Doh.



    So I now have a 24" x 48" polycarbonate panel headed my way. Easy fix.

    On to making the dash top a decent acoustical equivalent.
    Last edited by geolemon; 1 Day Ago at 08:31 PM.

  10. Back To Top    #20

    Re: Bought the Civic Hatch lease out, so rebooting the install thread

    I had some scrap hardboard from adding a wall of whiteboard to my shop, some scraps of plywood...
    Should be a good enough acoustical analog for my dashboard.

    You can see spaces I left on the sides -
    Those holes are there so I can experiment with speaker orientations - some of them are going to be in that corner dash top location. Easy to cover up for alignments that don't use them.



    I can't mock up fake A-pillars until my polycarbonate shows up and I install windows again.

    I have a ridiculously thick fake fur rug from Ikea right next to me as I type this... That will go under this rig eventually to mock the acoustic absorption of the car carpet. Another thing my fiancee will love...
    Bad enough I've stuck this in the rec area of the basement, now I'm going to steal the rug.

    Here's my actual dash for comparison.

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