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

[Slicknashville]

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

Thanks for the replies...

No problem on the feet, I have some here I can use off the sub I am retiring.

I can add the additional baffle, have supplies here to do that and yes, it does look better, thanks.

My UPS man still hasn't arrived......so I am sitting here playing (becasue I have had no real training) with subwoofer enclosure software and I can get a good looking graph using Bass Box 6 when I use the port I will have to use until my AE PR arrives, but I can't get the response graph to look anywhere near it when I model the PR in the software.....Does anyone use bass Box 6? Here are the PR parameters I used, direct from AE.

I have also used the EXCEL program Woofer box and Circuit designer 5 .....but it confuses me slightly with the different terminology used for some of the parameters and I don't know the conversions...... I realize someone posted their spreadsheet on here but that was modeled with a different PR. I am just passing my time until my 2 shipments arrive. Thanks to those that are helping me out. If anyone ever modeled the infinity with the AE PR in Bass Box 6 or WIN ISD OR Woofer box and circuit designer 5 and got the graphs to show a -3db point in the low 20's maybe you can post your file and I can see which parameters I have wrong....

Fs: 6Hz
Qms: 74
Vas: 279L
Cms: .7mm/N
Mms: 970g
Rms: .5kg/s
Sd: 530sqcm

[kevin007]

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

I have been lurking on this thread for months and just recently started my Digger 8 build. I went with the Infinity, the Bash 300, and ordered the AE PR 12-970. Knowing the time for the AE would be the unknown variable in the bunch, I built my spec box Saturday and much to my chagrin the BASH AMP was DOA upon its first attempt at playing.

I knew it would sound bad without the PR, but I was ok with putting a large port on it until the PR arrives. So I have already sent back my Bash and am expecting my replacement tomorrow sometime.

I saw someone else use the port for a temp fix until their PR arrives....... Can anyone tell me the port length when using a 2.375 inner diameter port assuming the entire length is OUTSIDE the box. I also have some 4" port lying around, but i only have about 24" of that diameter......and this is just a temp fix for playing in the garage until the AE PR gets here, another 3 weeks is likely.




ALSO>>>> Since my AE PR isn't here, I would like to know is the clearance between the AE and a Bash 300 sufficient in the 20" tall 9"x 14" box design? I fear I may have to make another box and mount the BASH as low as possible......It currently sits about an 1.75" above the bottom of the box (centered on the 9" side, opposite of the 8" woofer)

If you look at my sig you will see that I built two of the digger 8's. I would recommend 2 things.

1. Make the side with the PR 1.5 inch thick. The AE PR is a monster and if you want to flush mount it, it will take a 3/4 deep cut to have it flush.

2. Buy some feet for the box. Mine on carpet stayed in place, but now even with the large rubber feet on vinyl it dances all over the place when LFE is happening in a movie.

The output of these little guys is so great that my wife has not hung pictures on the wall opposite of where the subs are located. And to keep our wedding picture from the great plunge I used a 8 penny nail in a stud and left it sticking out 1 inch at an angle.

One thing that I found out is that the deep bass is kind of wasted on me. I found that I do not hear anything below 30 Hz. I can see the woofers and PR moving but don't hear the bass notes. My oldest son the bass head thinks they are the greatest thing since the hulla hoop and is amazed at how low they go. We have run those woofer burner clips off YouTube and you can see the woofer moving all the way down to 8Hz. It is a killer little sub!

If you are going to watch movies and such using one of these guys it will add so much to your movie experience that I just cant put it to words. You are going to love your digger 8!

Kevin

[pecker]

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

Can anyone tell me the port length when using a 2.375 inner diameter port assuming the entire length is OUTSIDE the box. I also have some 4" port lying around, but i only have about 24" of that diameter......and this is just a temp fix for playing in the garage until the AE PR gets here, another 3 weeks is likely.

I used that driver in a box of approx. the same volume with a slot port whose area was almost the same as your 2.375 port.
It needed about 24" long to tune the box to 25Hz, so you could try one about that long.

Unfortunately the driver did not perform like the model...there is almost no output at 20Hz. Even at the box tuning of 25Hz, though I can feel air pumping out of the port, the main sound I hear at that freq is the driver rattling like a bucket of bolts.

[Slicknashville]

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

I have been lurking on this thread for months and just recently started my Digger 8 build. I went with the Infinity, the Bash 300, and ordered the AE PR 12-970. Knowing the time for the AE would be the unknown variable in the bunch, I built my spec box Saturday and much to my chagrin the BASH AMP was DOA upon its first attempt at playing.

I knew it would sound bad without the PR, but I was ok with putting a large port on it until the PR arrives. So I have already sent back my Bash and am expecting my replacement tomorrow sometime.

I saw someone else use the port for a temp fix until their PR arrives....... Can anyone tell me the port length when using a 2.375 inner diameter port assuming the entire length is OUTSIDE the box. I also have some 4" port lying around, but i only have about 24" of that diameter......and this is just a temp fix for playing in the garage until the AE PR gets here, another 3 weeks is likely.




ALSO>>>> Since my AE PR isn't here, I would like to know is the clearance between the AE and a Bash 300 sufficient in the 20" tall 9"x 14" box design? I fear I may have to make another box and mount the BASH as low as possible......It currently sits about an 1.75" above the bottom of the box (centered on the 9" side, opposite of the 8" woofer)

[TKanzler]

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

Thanks TKanzler for the drawing of the Infinity. The JBL is not as deep if anyone is questioning fitment of the JBL version.

It's the least I could do, being that someone else (you) did all the hard work. ;) I needed it anyway to make sure it'll fit in a down-firing version (sketch below).

Benji - sketches sent.

This is what I'm working on, a down-firing version that otherwise looks the same. I added elliptical feet with spikes to match my PSB towers, and I'll finish in birch veneer and black (finish unknown at this point). The Dayton PR is shown, but the AE will be used, and without it in-hand, I kept the bracing far enough away to not have to sweat it. But I won't do final assembly until the PRs get here, just in case. I also don't know the actual thickness of the PR flange, nor the OD, so the holes will have to wait.

The white 'box' at the lower-right in the side elevation represents a worst-case plate amp, base on the BASH 300 specs, but I think I'll end up with a remote 2-channel amp in the end, and I'll test it with another 2-channel I'll borrow from my music system. The intent is a pair of these subs, left and right, though final placement will take some experimentation of course.



(forgive the sketchy sketch - it's just a scratch sheet, not a finished drawing :rolleyes

[jsr]

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

Cannot remember if I thanked you, JSR - but thank you! Mine will be powered by the 240 amp, along with a host of car amps I have sitting around being tested. It does need some spike feet as it likes to dance on my basement concrete floor. Complements my Hitmakers in my office/man cave/gym quite well; I love it!

Looks great JCSquats! I tried it with a car amp also and works wonderfully.

Thanks TKanzler for the drawing of the Infinity. The JBL is not as deep if anyone is questioning fitment of the JBL version.

[Benji]

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

All walls 0.75in. You can mane the baffle 1.5in to fully countersink the driver. HTH.

Excellent, thank you jsr! Getting so close to assembly! I can't wait!

Based on that comment, I figured I'd better take some measurements before I get too far. Since I needed accurate envelope dimensions of the Infinity driver to make sure the bits all fit without interfering, I made a drawing, which is attached. If anyone wants the AutoCAD or dxf block file, send me a PM with email and I'll forward it. It's simplified, but the outside envelope dimensions are accurate. The largest parts, like the shoulders on the motor rubber cover and the basket, were used to make it a worst-case scenario, and therefore also eliminating orientation issues.

TKanzler! That's awesome! Thank you! Will PM you shortly.

[JCSquats]

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

Cannot remember if I thanked you, JSR - but thank you! Mine will be powered by the 240 amp, along with a host of car amps I have sitting around being tested. It does need some spike feet as it likes to dance on my basement concrete floor. Complements my Hitmakers in my office/man cave/gym quite well; I love it!

[TKanzler]

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

If the Infinity is any deeper than the JBL, you'd have to adjust box dimensions to get them to fit.

Based on that comment, I figured I'd better take some measurements before I get too far. Since I needed accurate envelope dimensions of the Infinity driver to make sure the bits all fit without interfering, I made a drawing, which is attached. If anyone wants the AutoCAD or dxf block file, send me a PM with email and I'll forward it. It's simplified, but the outside envelope dimensions are accurate. The largest parts, like the shoulders on the motor rubber cover and the basket, were used to make it a worst-case scenario, and therefore also eliminating orientation issues.

[rhodesj]

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

I just finished my Digger8 build. A couple notes:

I used a M5x.8 50mm bolt on the Dayton PR for adding washers. A #10-32 bolt would probably work as well; the two are very close in size, and are compatible when there's not a huge amount of thread engagement.

I used 35ish 2" fender washers from McMaster here. Home Depot only had 1.5" fender washers, and it would take a stupid number of those to get the weight you need on the Dayton PR.

I had a Dayton SPA250 plate amp and used it on this build. It's hard to recommend just due to how large the Dayton is. It only barely fit on the side of the amp, with less than 1/4" clearance between it and the JBL driver. If the Infinity is any deeper than the JBL, you'd have to adjust box dimensions to get them to fit. I did make my box 1.5" taller to compensate for the much larger internal volume taken by the Dayton amp.

With all that said, it works and sounds great. I'm using it under my basement workshop/computer desk with my Overnight Sensations.

[TKanzler]

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

All walls 0.75in. You can mane the baffle 1.5in to fully countersink the driver. HTH.

I'm making one side 1-1/2" to recess the AE passive radiator, and the bottom 1-1/2" also, with a down-firing woofer. On legs, to keep it off the floor, of course.

[jsr]

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

All walls 0.75in. You can mane the baffle 1.5in to fully countersink the driver. HTH.

[Benji]

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

I think I've lost this information somewhere or I'm being blind, what thickness should the wood be?

[TKanzler]

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

Thanks. I was thinking an FMOD subsonic filter would be enough, as the AVR supposedly sets the low-pass value in the programming. I believe it's also manually adjustable. The instructions (Yamaha RX-V675 7.2 channel) call for setting the lp filter on a subwoofer plate amp to its highest frequency, presumably so it can take that function over.

The FMOD units are only about $25 for a pair. I don't know if they're even needed, but I'll keep an eye on the subs, FWIW. I suppose filters would be cheap insurance, though.

[jsr]

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

It'll work fine. Just set up the LPF, and if possible a HPF. If no HPF option, just be careful not to over exert the drivers.