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

[bluejay29560]

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

Thanks again JSR. I know that the down-firing active driver design is not yours, but do you think that 1.5" rubber feet will give enough height to allow the Infinity to "breathe" properly? I looked at the Outlaw 8" ported down-firing sub and it appears to use 1.5" rubber feet. Merci....Bluejay

[jsr]

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

1.5in is fine. I'd like a bit of margin so I'd see if I could find 2-2.5in personally but 1.5in will work fine.

[Pete Basel]

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

Has anyone measured the input impedance to the woofer on a
completed closed up system?

[jsr]

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

I only have the sim. If anyone has measured it, please post. Thanks.

[TKanzler]

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

I have another revision that is smaller than the current design while providing the same performance. I just don't have time to confirm fitment. The smaller (more space efficient) design costs more than the original Digger8 but costs are the same as the improved versions that many are making. Perhaps some generous person with time and money for some mdf and cutting can help me confirm fitment to get this smaller version out.

I haven't been able to find the new and improved version anywhere. Did you post any details somewhere?

I'd like to give it a go, either the original, or the improved version. Space (well, WAF actually) is tight, so small is good, and more than one may be better, and shouldn't pluck the wrong nerve. :rolleyes:

[jsr]

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.

[jsr]

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.

[TKanzler]

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

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).

. . . 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

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:

[TKanzler]

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

Wow, that was quick. Thanks.

[jsr]

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.

[TKanzler]

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.

[TKanzler]

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.

[pecker]

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/B002GHBUFY/ref=oh_details_o00_s00_i00?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

[bluejay29560]

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

[jsr]

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.