Rat fur refurb
Hi DJK,
can you use existing rat fur as a textured base for a thick layer of paint?
Regards, Ben
Rat Fur (carpet) is expensive, heavy, and gross when it gets dirty or wet.
I just use black paint, and carry a bottle of black shoe dye to touch up scratches.
I have friends that prefer the rat fur, if you do that buy a dark grey color.
Light gray looks OK when new, but shows any dirt after a while.
Hi DJK,
can you use existing rat fur as a textured base for a thick layer of paint?
Regards, Ben
I thought I'd bump this back up a bit since I've accumulated some experience with this SS15 "v2" design. I really like it, and I've built 4 of them now. I'll admit the dimensions are slightly wonky on mine due to trying to build with jbell's v2 sketch before realizing the dimensions are inconsistent/incomplete for the internal panels. This diagram above is more complete and reasonable. Mine have some small errors, like one has the rear of the baffle .75 in lower than it should be. Regardless, i think there is a lot of merit to be found in the slimmer, longer path revision.DISCLAIMER FOR ANYONE BROWSING THIS THREAD: THIS IS NOT THE OFFICIAL JBELL LAYOUT
I built in 3/4 poplar and loaded with 4015lf. I previously built a vanilla SS15 with the 3015lf. I'm really happy with the changes on the new one. It's a heavyass cab now given that both the 3/4 poplar and the 4015lf add significant weight, but it's still very reasonable. Clocks in at 40.4 kg.
The longer path length gives a noticeable drop in the low corner. As jbell said, it will "hit 40hz with authority". Especially if you give it a little boost below 45.
I'm not sure if eminence made physical changes to the 4015lf VC or not, but they recently revised their power rating for the 4015lf to 1200 watt from 700 watt. It could be they use a more advanced adhesive, or it could be that nothing has changed and the original rating was too conservative?
I typically set my inuke limiter at the voltage equivalent of 700w into 8ohm, but the driver only ever gets mildly lukewarm and the excursion is pretty under control. And this is on high duty cycle EDM/trap/rap. I've loosened the limiter occasionally when there's a need for a bit more, and it handles it just fine.
It's been brought up several times before, but I think it would be really cool to see a completed set of HR inputs, plans, specs, test results, and such for the v2 version. It seems to me to be a very good option for people who feel that the 50-55hz corner on the original is a bit too high.
I'll see if I can eventually drag my equipment out to some open space to do response measurements. I finally got a decent measurement mic with my driverack px.
I also put a few pics up of the subs and their most recent outing to the campgrounds of a music festival.
SS15 V2 - Album on Imgur
SS15 V2 - Album on Imgur
Art (Weltersys) reported experiencing distortion issues with the 4015LF in his TH design (the "Keystone"). I'm curious to know if you've experienced the same thing.
Looks like you also have two of the SS15s loaded with a different driver. What driver is that?
3000dsp. One bridged into two cabs.
The two other cabs have the 4ohm Lab15 drivers. Actually works decently well. Doesn't sound too peaky and not a lot of phase problems w/ the 4015s. If anything the only drawback, if hornresp is accurate, is the sensitivity is lower with that driver than the 3/4015. Grabbed em because they were way cheaper than two more 4015lfs which I couldn't get budget for.
I also wouldn't be surprised if the distortion figures are pretty high at high drive levels (700+w equivalent limiter). I'll try to figure out how to do that kind of measurement when I do the frequency response. Probably the price you pay for getting freaking loud with such a small driver. The only sub I've owned that I could compare it to to get an intuitive idea of how much distortion there is is a Mackie SWA1801, which it blows out of the water no question.
The two other cabs have the 4ohm Lab15 drivers. Actually works decently well. Doesn't sound too peaky and not a lot of phase problems w/ the 4015s. If anything the only drawback, if hornresp is accurate, is the sensitivity is lower with that driver than the 3/4015. Grabbed em because they were way cheaper than two more 4015lfs which I couldn't get budget for.
I also wouldn't be surprised if the distortion figures are pretty high at high drive levels (700+w equivalent limiter). I'll try to figure out how to do that kind of measurement when I do the frequency response. Probably the price you pay for getting freaking loud with such a small driver. The only sub I've owned that I could compare it to to get an intuitive idea of how much distortion there is is a Mackie SWA1801, which it blows out of the water no question.
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If possible in the sheet layout, I think it would be better to change the way the baffle board and front panel join so the baffle board overlaps the front panel instead.
2 of 4 of our original ss15's started to fail at this join, with a crack opening up along the glue line from the centre out. I had to add an internal board to re-join the panels, and I added screws to the joint on the other boxes just in case. They have been driven pretty hard at times with hefty ferrite RCF l15p200ak drivers.
The driver pushes the baffle board back and forth pretty hard in the plane of the join, so worth making this join tougher, leaving screws in rather than relying on just glue...
Rich
2 of 4 of our original ss15's started to fail at this join, with a crack opening up along the glue line from the centre out. I had to add an internal board to re-join the panels, and I added screws to the joint on the other boxes just in case. They have been driven pretty hard at times with hefty ferrite RCF l15p200ak drivers.
The driver pushes the baffle board back and forth pretty hard in the plane of the join, so worth making this join tougher, leaving screws in rather than relying on just glue...
Rich
If you use HolmImpulse (free) to do the FR measurements, it will also provide distortion measurements as well.
The 3000DSP is a pretty cool amp (I use one for my small PA system). Have you tried the 6000DSP? Damn - my cousin has two in his club and it's amazing the difference between the two amps.
I thought I recognized the LABs. In your situation, I'd probably measure the cabs and use the parametric EQ in the 3000 to equalize them so there's no difference between the 4015-equipped cab and the Lab15-equipped cab, as least as far as FR is concerned. That should eliminate any minor phase issues as well, at least within the passband. The DSP-equipped amps are IMO the *perfect* power sources for THs, with their built-in parametric EQ, dynamic EQ and filtering. Does this look like the response of a TH?
Attachments
I agree. That's why I bought two for the fraternity and I own one for myself. $280 for 2kw rms of class D power and a very capable DSP? Very good value.
It's said the 6000s are "just" two bridged 3000s stuck in the same case. Hence the inability to drive 2ohm loads. If I was just looking for power I definitely would have gone for it, but I really wanted more than 2 channels of DSP.
My only gripe is that they will go into protect mode quite often for reasons I don't fully understand. I've had it go red-knob driving a 8ohm load with the limiter set at 500w equivalent voltage. Should be a breeze, but it still turns off sometimes. I'm wondering how the limiter might be tied to that. I don't drive the signal straight into the limiter, but hitting it occasionally on peaks.
It also turned off a lot when I tried to push it on the generator, but that's pretty understandable. Probably voltage sag. I just really wish it was more communicative in general on what it's unhappy about. Or at the very least, the user manual should provide a more explicit list of situations that could push the amp into protect mode.
Other than that, considering you can build the 4015 equipped subs like I did for a hair over 300 each and the 3000dsp is a good match for running two of them, it's a hell of a deal. Huge SPL for 900.
Sounds like it's not getting enough power from the mains, or maybe the 8 ohm load is actually quite lower than that. Have you confirmed the load impedance with a meter? Or maybe a faulty driver or cable is shorting. I haven't run into that issue with my 3000DSP.
I wouldn't dare run one of these things directly off a generator. No PF correction in the PSU.
I'm not too concerned. It's a Honda eu2000i. It's in the quality tier of generators I trust to handle tricky loads without any issue. Now something like this, on the other hand...
http://www.amazon.com/950-Watt-Cycle-Portable-Genset/dp/B001QQHG54/ref=sr_1_67
No idea. The schematic was made by jwmbro in an attempt to make sense of jbell's sketch. Perhaps there isn't enough wood to make that top divider any longer.
http://www.diyaudio.com/forums/subwoofers/170771-single-sheet-th-challenge-157.html#post3072210
The V2 design might benefit from a refold, even while keeping the panel sizes the same for the sake of preserving the cutsheet. Or somebody ambitious could dare change the panels and re-balance the cutsheet.
I'm not sure how much care was put into the expansion, but I'm confident that it's at least in the right ballpark as is. Certainly works well enough for me. I still don't have HR inputs to even represent the V2 design, which is partly why I was hoping to spark some interest in going back and looking at the SS15 again. The first version is well documented, but all that exists for this proposed lower frequency sister is a revised cut sheet and two suggestions on approximately where the panels should be.
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The latest info I can find is jbell's post 1499 in this thread and Robin N Zone's work in this link...
http://www.diyaudio.com/forums/subwoofers/232784-best-pa-subdesign-eminence-kappalite-3015lf.html
I am going to build a couple SS15s soon but my thoughts are to use the original design but use some of the suggestions jbell posted in this link...
http://www.diyaudio.com/forums/subw...-eminence-kappalite-3015lf-8.html#post3462832
My plans are to use 4 of these for outdoor live shows. I don't see any reason to mess with the original design beyond adding better bracing. The low cost, weight and size are very attractive to me.
I wouldn't dick with the original SS15, it looks to be taking the 3015lf very close to the max in a box this size/weight and looks to have been used with great success in the real world. If you need anything lower, I think you should look in to a bigger/heavier/more expensive cab.