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Digger8 Sub - diggity dig it all the way to 20Hz

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  • kenrhodes
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    I am powering my subwoofer with a pro audio amplifier and a mtx car audio crossover for the "filters" It works well and the amp I have is true full range letting me dip in to some LOW frequencies. Do pay attention as some amps have built in sub sonic filters that will limit how low you can play. Good luck and have fun.

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  • Benji
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    I don't think I'm qualified to to give a definite so take what I say with a pinch of salt but, I would have thought it would be fine and I thought the iNuke series had the ability to configure filters though software?

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  • TKanzler
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Since I'm building two of these for my HT setup, is there any reason not to use a stereo amp instead of a plate amp in each one? Something like the Behringer NU1000 iNUKE with 300 wpc into 4 ohms?

    I realize it won't have a high pass filter built into it, but are there any other downsides? Those BASH amps are a fair bit of change, and I think I'll give them a try with my Acurus A200 (at 300 wpc into 4 ohms) to see how they work before cutting the holes for the amps (and before finishing), but I'm wondering if I can save some money by using a 2-channel amp.

    I got the idea from a recent thread where someone mentioned a 1200W pro amp (can't recall the thread, unfortunately - just stumbled onto it), and realized maybe I can source 300 wpc for half the money of two BASH 300's.

    Am I all wet here?

    Oh, and the Infinity drivers just showed up. :D

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  • DannyG
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    .
    Last edited by DannyG; 04-09-2014, 08:41 PM.

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  • bluejay29560
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Hopefully Ready To Rumble! Digger8 Sub Modified last stages of assembly. Bottom of cabinet w/Infinity 8" sub, inside cabinet, Dayton PR w/29 washers at 1.25 lbs, completed project. Will hopefully be trying it out this weekend. Hope it doesn't explode. Thanks again JSR for your advice....Jaybird4
    Attached Files

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  • jsr
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    You can mount the sub inside but you'll need bolts to hold it in place, unless you use a double thick baffle. Running 2 unmatched subs may cause issues. Due to different responses, there may be reinforcement of frequencies that will make the overall room response quite poor.

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  • bluejay29560
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Jsr, I am making progress with my Digger8 modified(using 1cuFt DIY box with 8" Infinity down firing and 10" opening enlarged to accept 12" Dayton PR). I would like to mount the Infinity inside the box. Is there a problem with this? I notice your box has it mounted on the outside. Also, the top flange of the Infinity seems to have a built-in hard rubber gasket. Can I just use it without adding speaker foam tape? Lastly, I have purchased the Yung 500w no boost amp(got for $149 from Amazon) and will use it external to the Digger8 modified as well as with my HSU 1225 TN(the 15 year old 150w amp is beginning to make a fluttering sound at rest). Both are 4 Ohm and should be about 250w to each. Do you see any problem with this setup? Thank you for your help in the past and any you give me going forward....Jaybird

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  • pecker
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    For anyone wanting to use the Infinity driver, Amazon has them pretty cheap at the moment:
    http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1


    Item(s) Subtotal: $46.16
    Shipping & Handling: $22.99
    Free shipping: -$22.99
    -----
    Total before tax: $46.16
    Estimated tax to be collected: $0.00
    -----
    Grand Total: $46.16

    Leave a comment:


  • TKanzler
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Macros have to be enabled. Doh! :o

    Whether that's the correct response shape or not is another story, but at least I've got something to play with now.
    Attached Files

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  • TKanzler
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    I'm trying to model the Digger8 in J. Bagby's spreadsheet, and something isn't right. I had curves, then they went away. I've been through all the TS parameters for both the driver and the PR, the box dimensions, the 'switches' at the bottom of the first graph (Cone, Raw, and Vent SPL are 'on'), and all I get are a few little bits of color on the SPL axis. With the -3, -6, and -10dB values showing '#NA', it looks like I'm violating the laws of physics, but I can't see where.

    I'm just doing this to try to learn to use the program, as I intend to build it as-designed, so it's not a big deal if I can't match the results. But if anyone can tell me where I've gone off the rails, I'd appreciate it.

    Oh, and the passive radiator is not the CSS APR-15 as it says - I overwrote the values with the Dayton, since I had them handy already. I just didn't save them to the third tab, which I hadn't noticed until I put them in on the first tab.

    Click image for larger version

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  • jsr
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    I knew I forgot something...I updated the post, and just added the revised alignment for the 9x14x17 cab. I think everything's there now.

    I'm surprised my Digger8 is still unfinished MDF and my wife hasn't yelled at me. Unfortunately I don't have any space defined as "mine" on my property. In the garage, I have a small computer desk where I do soldering and electronics assembly and in the house, my work area is under the kitchen table (yes, I crouch on my knees underneath a table where I have some speaker parts and tidbits). I do occasionally drill and screw things here and there, but only until my wife comes to tell me to change my daughter's diaper or something.

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  • TKanzler
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Wow, that was quick. Thanks.

    Leave a comment:


  • TKanzler
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Originally posted by jsr View Post
    It takes up the same floor real estate add the standard Digger8, but it's about 3 in shorter. Not a huge difference unless the lower height plays a role in WAF.
    Everything plays a role in the WAF calculus, but lower height is a move in a positive direction, even though it's a diminutive size to start with. If I trim the height down by 3 inches, what's the tuning? Or does the passive radiator remain the same? I'm planning on the Infinity driver, AE PR, and Bash 300 amp. Twin L/R units, though I'll probably only source the two PR's at the same time, since they are built to order and take the most time. I won't do any finishing unless and until I'm happy with the sound, but I won't be able to leave an unfinished sub sitting around for long (like my son's 12" sub we built a couple of years ago - didn't stay long in the fam. room).

    Originally posted by jsr View Post
    . . . Until my wife yelled at me to turn it down.
    Know the feeling well. :D It's why I soundproofed (to a degree) my basement office, which also serves as my listening room, where I keep the better stuff. :D:D That and my shop are MY spaces; she can have the rest of the house. :D:D:D


    Originally posted by jsr View Post
    I'll update my OP some time with the improvements people have done and options. I kind of mentioned some I think in my OP but I'll try to expand.
    Whatever you can update would be great. Winter is starting to wind down, and spring is not the time for shop work of this sort, so I'm going to start on it and hope I don't run out of cold weather. :rolleyes:

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  • jsr
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    OK, I finally updated the OP. Hope I captured everything to make it easy for people.

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  • jsr
    replied
    Re: Digger8 Sub - diggity dig it all the way to 20Hz

    Sorry I haven't posted any details of V2. It takes up the same floor real estate add the standard Digger8, but it's about 3 in shorter. Not a huge difference unless the lower height plays a role in WAF. The low floor real estate does allow nicely for multiple units spread around the room. Great coverage and minimal room modes then. I watched some Pacific Rim last night and the scene where the little girl holding her shoes was being chased by the monster, when the jets first shoot missiles, that boom hot my chest with some nice oomph. Until my wife yelled at me to turn it down.
    I'll update my OP some time with the improvements people have done and options. I kind of mentioned some I think in my OP but I'll try to expand.

    Leave a comment:

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