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Ricci's Skram Subwoofer & Files


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This is the long delayed single driver sub similar in design to the Skhorn. Overall the performance goals and criteria were quite similar. Big surprise there! The Skhorn works so well at what it does

So close.  Loading drivers and doing the wiring today 

Ok... report after 3 full days of Skram use.  Josh, thank you for this amazing design! I am simply blown away that this kind of performance can be had through diy designs, you are doing the music worl

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We finally "finished" our two skrams, at least so far, that we could fire them up for the first time, last weekend.

Together with our self designd Top (AMT + double 12" in  CB, also just "finished") this was one of the most stunningly setups I´ve ever heard.

The skrams made the perfect underline for the Tops, wich were designed to produce the cleanest sound possible.

It´s absolutely crazy what output just 2 Skeams have, while the Ipals arent´t even moving.
Looking forward to build 2 more of them (but the next will be made of the good old BB and be Paintet with duratex. No fancy carbon enhanced popplar plates, epoxy logos or acryll glass front)

-Josh, you are my bass-hero :)

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Gig report- very impressed. I didn't have time to do proper measurements/EQ with a mic so I fiddled around in hornrep ahead of time to get a phase match with the keystones. Landed on delaying the Keystones 5.8ms with a phase invert. Based on the rich sound, coverage, and amp levels vs output, I think that must have been reasonably close. We had some issues maintaining voltage with the cable runs and generator capacity, and I was quite conservative running the NX6000 into them since I haven't set up proper limiting, but it was more than enough to prove these cabs are quite capable. Got the same excited feeling of bringing the system up to a brand new level as when I put together the Keystones. Of course, now I've got the itch to pair them with a Powersoft amp...

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20 hours ago, MomoTon said:

We finally "finished" our two skrams, at least so far, that we could fire them up for the first time, last weekend.

Together with our self designd Top (AMT + double 12" in  CB, also just "finished") this was one of the most stunningly setups I´ve ever heard.

The skrams made the perfect underline for the Tops, wich were designed to produce the cleanest sound possible.

It´s absolutely crazy what output just 2 Skeams have, while the Ipals arent´t even moving.
Looking forward to build 2 more of them (but the next will be made of the good old BB and be Paintet with duratex. No fancy carbon enhanced popplar plates, epoxy logos or acryll glass front)

-Josh, you are my bass-hero :)

Haha! Excellent work. I'm glad you like them. 

If you don't do CF/poplar/epoxy logo/acrylic front, they won't match! 😆

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16 hours ago, zryouiki said:

Gig report- very impressed. I didn't have time to do proper measurements/EQ with a mic so I fiddled around in hornrep ahead of time to get a phase match with the keystones. Landed on delaying the Keystones 5.8ms with a phase invert. Based on the rich sound, coverage, and amp levels vs output, I think that must have been reasonably close. We had some issues maintaining voltage with the cable runs and generator capacity, and I was quite conservative running the NX6000 into them since I haven't set up proper limiting, but it was more than enough to prove these cabs are quite capable. Got the same excited feeling of bringing the system up to a brand new level as when I put together the Keystones. Of course, now I've got the itch to pair them with a Powersoft amp...

Cool! Looks like a good time. Where are you located? That's a nice looking chunk of land. 

The Keystones are bigger than I thought. What drivers do you have in them? What drivers in the Skram's? 

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On 6/30/2021 at 11:10 PM, chrapladm said:

So do you have Skrams or just Keystones?

2 of each.

On 7/1/2021 at 8:41 AM, Ricci said:

Cool! Looks like a good time. Where are you located? That's a nice looking chunk of land. 

The Keystones are bigger than I thought. What drivers do you have in them? What drivers in the Skram's? 

Osborn Point out in the Cascades (Washington). Getting out there on the forest service roads is a bit of a challenge, especially with a ton of gear, but the vantage is amazing and you can make as much noise as you like way up there.

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21DS115-4 in the Skrams. Keystones are loaded with some spare OEM ceramic, stamped basket 18s from a friend at a local, well known audio manufacturer. They're no B&Cs but they sim nicely and have stood up to some abuse that is frankly well past the specs I was given for them. They've got a good motor and great excursion capability. I think the excellent driver cooling of the Keystone design helps them stand up to the abuse.

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Good to see some more SKRAMs getting use at outdoor parties! I built my 3rd for a party at easter, still with the 4x 10" car audio drivers as I ran out of time for testing the Dayton 18"s i bought.

Ran for 3 days with 4x Martin W3s for top end and everyone loved it, so many compliments on the sound all weekend!

Will be building a 4th soon to finally test the 18"s so i'll keep everyone updated whenever that happens.

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On 7/1/2021 at 12:09 AM, zryouiki said:

Of course, now I've got the itch to pair them with a Powersoft amp...

 

this should help with your generator issues as the measurements I have seen of Powersoft amps(x4/x8) show sinusoidal in phase mains current whereas reports on the NU/NX6000 indicate large current spikes.

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6 hours ago, kipman725 said:

this should help with your generator issues as the measurements I have seen of Powersoft amps(x4/x8) show sinusoidal in phase mains current whereas reports on the NU/NX6000 indicate large current spikes.

The magic of PFC... love it

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  • 2 weeks later...
On 7/5/2021 at 4:31 PM, peniku8 said:

The magic of PFC... love it

Yep...Definitely helps get what you can from a junk AC supply

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Hello all, first of all thanks to everyone for the knowledge share and specially to Ricci for pusblishing your works. I've been years behind the Othorns and when finally I was able to build them I leaned to the Skram as it seems more reasonable for me in terms of costs (going for the Lavoce) and mobility.

I've been organizing the .dxf files that @dsl1 shared and named them according to the pdf that Ricci shared (Ricci I can send you the files in order to swap them in the front page to ease the work of newbies like me, if dsl1 agrees). I have some questions referring to that:

- The back panel brace (part T) is divided in two, right? (back brace 1 and 2, one having an angle)

- The middle hatch brace (part Q) is removed? I cannot identify it and also I see that there is no dado in the hatch.

Also another question apart from the Skram just to not do a double post, if it's OT please just ignore it. I've seen since the Othorn that plenty of people recommends the 4ohm version of the driver. Apart from power requirements do it sound different from the 8ohm version? I have a Crest 9001 and I planned to put one per channel at 4ohms (amp will deliver 2050w per channel) but thinking on upgrading to 4 subs the crest will be delivering 3000w per channel at 2ohm. 2 cabs per side go up to 3400w so I don't think those 400w will make a difference. But the 8ohm version will allow me to put 3 per side if swapping the amp and also have more resell value just in case. Can't decide about what to pick... been with this thoughts for years, what do you think? In sound terms (musicality, tightness, whatever...) will it make a difference?

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Hello Waipy.

8 vs 4 ohms depends on which driver. There is usually some small difference between 8ohm and 4 ohm models, but it is not enough that it would be very audible in most cases. Usually the 8ohm version will have slightly less motor force and higher Qes/Qts. I do not think you would be able to tell them apart in a blind listening test in most cases. 

Back panel brace T does not have an angle in the original plans. It is not divided in two.

Brace Q is removed if using a plate amplifier. 

These may have been modified in DSL's cnc files. Neither are critical to be exactly the same as the original plans. 

SKRAM Internal bracing.png

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Thanks for the info Ricci, I'll go for the 8ohm option as LaVoce only has 8ohm haha

Regarding the pieces, yes I meant dsl's files. So actually this was a direct question to him. Anyway if they are not critical as you said I suppose that my guessings are correct.

I'll upload some photos when the build begins :)

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