ChikoRomantiko

On 9/1/2022 at 12:48 PM, Alexlel said:

Using 3 boxes for the 25hz-220hz seems counterproductive to me, especially if you didn't put them properly in phase.

Funktion One Dance Stack

On 9/1/2022 at 12:48 PM, Alexlel said:

Hello Alexlel,

If you ever use this setup again, you shouldn't use the mini scoops and just cross your Skrams way higher.
If those BPHs are ES18, you can (and should) probably cross them at 80hz directly with the Skrams.
Using 3 boxes for the 25hz-220hz seems counterproductive to me, especially if you didn't put them properly in phase.

If you build 2 more Skrams, even if the boxes don't have the same drivers inside, let them play together, the phase should be pretty similar, you will win more than using them crossed separately

 

I agree with everything you said and I believe that 4 Skrams will do the job!
Otherwise, we only put bph above the skrams and they do all of the above!
I like sound system and I like to play with it so that in the end you understand keep it simple and smaart but the way to get there is fun  
There were no problems with the phases, in fact the best so far. Skram brings an earthquake and mini pushes it

similar words came from Ricci when I posted the first picture, in short, this is how I got strength that I wouldn't have otherwise and it was needed! , unfortunately we didn't have time to make two additional skrams (they are finished now) so this was a really good replacement.

Hello again!
I don't know what the weather is like in your place, but it's still hot here in Croatia.

A week ago we took the sound system out to the festival, but unfortunately we didn't have 4 SKRAM as planned.

Otherwise, what I would try is that the lower SKRAM work from 25HZ to 60HZ and the upper two from 60HZ to 110HZ..
Why is that, since in one box we have 21B&C SW152 which would be for the lower range and 21RCF N551 which would be for the upper range(personally). Normally, we'll try how it would be if both boxes worked at the same frequency range and one more thing we didn't try is to close two more output ports from the lower SKRAM to get the depth, even though they still go quite low and sounds nice.

Currently, as you can see in the picture, instead of SKRAM, we put mini scoops that did a great job.
I can't wait to do it  , listen and measure the boxes to see what happens with the phase between the different drivers and how its sound overall with 2 more but I think it will be much better because as Ricci said, it is better to have more same boxes like this that work the whole range from 30 to 110HZ than for example like in the picture with mini scoops. 
I need to hear that combination to be able to make a comparison but I think it will better w SKRAM since there are no different boxes although this was very mellow tight and clean  

Other two almost finished !

SKRAM 21' RCF N551 (25-55) "MC2 E45 Bridged"

MINI SCOOPS 18' 18SOUND LW2400 (55-105) MC2 E45 Bridged

BPH 18' 18SOUND LW1200 (105-220) "MC2 E25 Bridged"

F1-DS210 (220-18K) "MC2 E15"

On 12/20/2021 at 8:44 PM, Ricci said:

Did you try listening to music that has deep bass <40Hz? You should hear a huge difference. 

Everyone has their preferences for sound but personally I'm not a fan of running a 4 or 5 way rig with the bandwidth split up into tiny segments in the bass range. When I see the picture of the stack with the Skrams you posted...I think that 1 or 2 more Skrams sitting in place of the MBM's and running the whole bandwidth would be better. That's just me though. 

Hi, I agree with you @Ricci that two extra skram would do the job without bph kicks. I connected it to a D&B amplifier and put it to work as 21S SUB the same of them (since there is no setup but the model is chosen) and oh how it works well the whole range up to 105Hz - (-5db) with their settings,
Unfortunately the problem is that we currently have them two and no money for other two and in this situation I sacrifice the SPL to go low, an additional two skram could then do both but as SME and Peniku stated many times the basses are cut and the music is listened to without skram and at one point the magic just appears : D

On 12/20/2021 at 8:44 PM, Ricci said:

Interesting comparison...I'm not surprised that the scoops sound totally different. Scoops are really efficient over a narrow bandwidth. The trade off for the efficiency is peaky response, limited bandwidth, limited low frequency output and BIG size. Most of them are huge cabs but really only have LF extension to 40-45Hz. What 's the dimensions for those scoops? Those look BIG. I've never seen any in depth measurements of a good scoop design. 

This is the box made for PD2150-(636,1320,798), it is quite big and not modified for b & c 21 ds115 .. If you are interested I have a slightly different scoop design that I modified for 21ds115 and I am currently waiting for a colleague to make it but as it started I will before: D this is from hornresp .. of course his purpose is to go low and have a spl -  mine is 636x1466x836(w-h-d)
 

6 hours ago, peniku8 said:

Wow, dedicated MBMs with Skrams and horn loaded tops! Do you even need those? That's a lot of upper bass.

Since it is a soundsystem culture and bass music is played the most (DUB / DNB) it is necessary, especially when you have tms4 over 30 years old I made measurements before in the room where we keep the sound and this is how it would look like ... Someone will say no you are crazy, someone that Skram can do range these boxes above them etc ... I agree but I put less strain on him like this and gave him more power for the range that works (29 - 55/60) bph works from (60 - 100) ) and 18 from tms works (100-240) low mid which is otherwise harder to get to sound right and not wonky..
Measurements were made in the room and this is so you can imagine what I think..smoothing 1/24

Hello everyone! A few days ago we pulled the speakers into town and enjoyed a little bit (some yes some no)  
unfortunately I didn't have time to do the measurements, but the only thing missing were two more boxes :D 
The difference between these two sounds is in the years. Tms4 are 35 years old and still work impressively, far from being loud for "today's standard", but during that time, respect 🙏 The kicks were modified BPH with 18Sound and Skram with RCF. Other sound are scoop from Rog 21 'loaded w B&C , Kickbin C2D-15' w B&C  and the top box is not finished and loaded w 18Sound.
A comparison between these two box. Scooper have more SPLs and up cut off i higher than in Skram, but for my ear Skram is much more tonal and works better overall, for some people scoop is better, they don't have the depth that Skram have and these days I'll switch them to DSP from K10 and make my cut off freq. and do comparison again hopefully outside w measurement, because now are connected to Ligwa Preamp (only Skram).

On 4/14/2021 at 5:24 PM, Ricci said:

Chiko,

I'd suggest putting some damping in there behind the drivers. It should clean up the top end a bit and "tighten" the sound. 

Thank you, know i need since i read about skhorn.. we don't have money at the moment as we want to do everything in one purchase (handles, connectors, paint for those and others  boxes and some other things like protective angles etc ..) also think i will close two ports and see outcoming as the main purpouse of the Skram will be 30 - 65Hz
can’t wait for a little warmer weather to take the whole sound out and test it properly!
We need to make two more Skram and a party in the village : D

Ricci what do you think about Paraflex C-2E 1x21 ? 

On 4/8/2021 at 6:08 PM, jordy said:

hi Choko, I could not make clear out of your poosts if you use them at home or PA purpose. 

As for the speakers I used b&c 21sw152 is more beastly but to me personally ds115 is much more tonal sounds nicer and softer in lower frequencies .. why I chose rcf because it is sharper, much more aggressive about 60hz than all the others, and if I put 4 the skram will go deep enough to cover that small flaw that it has unlike these two .. if we look at the PA purpose and the sound to me personally of these three rcf is the one that meets my needs.

I use them primarily for my own pleasure: D hehe
for PA purposes, I have my own sound system DIY (DUB / Bass music) and also work for rental company .. I put two Skram with rcf speakers inside connected to the k10 with DSP (but48_30HZ-65HZ_but30) main purpose, because we also have a bass section with which I cover most of it (270hz)  ...
I also used skram of 30-110 hz with RCF HDL 26A and they work really really nicely !!
with 4 scrams covering 500 people concert for sure!

unfortunately I haven't played with port tuning yet and I also haven't dumped the skram with anything inside, meaning just a speaker and bare wood!

Greetings!
After listening to "Skram" for a long time(3mon), I can say that the box works very nicely and controls the speaker very well .. I tried to put it inside B&C 21DS115-8 // B&C21SW152-8 // RCF 21N551-8
I am currently using Rcf and staying with it because it is raw and tight, and the overall performance is better , better spread over octaves than with two b&c SW152 is deeper and stronger but therefore more muddy or undefined, ds115 sounds even more beautiful to me in terms of softness and bass, but it lacks "strength" compared to these two before ..

 

The frequency response is taken from the original pdf 451 and 551

Greetings...
Thanks Ricci for the box design and free plans!

After a lot of reading about these boxes, I decided to make them for a project I have with a friend! so far we’ve made two and I’m looking forward to turning them on, measuring them and adding them to the rest of the sound.
My question is related to the speakers I would use and if anyone can explain to me the difference between these two frequency responses (RCF551 and 451) and why is such a curve at 451.

551
451

I've seen that with the b & c driver 18ds115 which we currently use in the scoops box and it sounds great!
I have a chance to take two new 551 and I think they would work better in this box than a 451,  maybe I'm wrong :)?


Thanks in advance!
Chiko