rolo95

On 4/14/2022 at 6:06 PM, jay michael said:

While the limiters are basic on the dbx units I think they are enough to get by. I ran a Pa2 for probably close to 7 or 8 years and never burnt up any drivers. The venu360 is a big step up in functionality and sound quality but at that price there should be lots of good options out there. Personally I think if you are running your system into limit hard enough to think your limiter isn't up to the job the problem isn't your limiter, its that you don't have enough system for the job. I haven't needed to run my Skram's or my Danley's into limiting yet, if the day comes that it is required ill just start cutting up more wood 

Im not shure but the ashly proteas and even the peavey digital ones suppose to be better than the DBX entry level, thing is that not anybody can tell the difference on a blind test on a live setup,i wish to have an XTA or BSS lol., there is an EV and a mackie processor also and many guys still use the behringer unit, so i cant tell by myself as i only have the old driverack PA. 

no worries man, 

my current lineup is 1 PLX 3002, 1 XLS 2500 and 1 XLS 2000 , on a dbx driverack pa ( the old one )

i read that even the behringer 2496 is better in the limiters than the dbx pa, what about the miniDSP

i have 4 b52  EV l36 clones that i need to get rid off, i got that from a guy who do not want to DJ anymore

and i get that around 2013, i did not know anything at the time, then start reading the DIY forums

and now i know that the dbx pa suck and the b52 subs suck more., lol. so i need to get something else

btw, the tops were some 80's jbl MR925's  4 of them, they are heavy as F... so i want to change that also

anyway... i need to start from somewhere , cant get rid of all and left without any workable rig

if i had the dough , i think i will get SH50's for tops and tell somebody to build 8 skrams 4 me

with Lab gruppen , for now CVR amplification lol when i swap the old amps

20 hours ago, peniku8 said:

iirc the LaVoces were in a parts express deal for 400 flat or something, 3 years ago.

I paid 410$ for my 21DS115's. Now they're around 650. That's up over 50%...

Imo it makes no sense to build the Skrams if you intend on putting non ideal drivers in it. A good subwoofer is a good subwoofer, but that's the entire system of driver+cabinet. Even if the cabinet design is stellar, it'll make a bad subwoofer if you don't put the right driver in it. That's also how DIY got a bad name over here. And just outright bad designs of course.
Build something else if you wanna use other drivers or design a simple vented cab if you have a specific driver in mind. Designing a vented cab with a slot port is really simple.

I guess, no wonder a danley TH118 are so expensive not to say we are paying the R&D but the 850USD drivers

Speaking of vented cabs, i was looking that the QSC driver in the 

• SP218
• SB7218
• WL218
• GP118W
• GP218SW

subs sells for 144

https://www.fullcompass.com/prod/594076-qsc-xd-000110-02-18-woofer-for-sp218-sb7218-wl218-gp118w-gp218sw

just to get the measurments of one of those boxes and make some   

On 4/13/2022 at 12:31 PM, Ricci said:

I

The lowest cost driver I can recommend for this cab is the Lavoce SAN214.50. It's a shame that prices are up so much. I remember when this driver could be had for about $475. 

If you are really on a budget and looking to try something the Dayton Audio PSS555-8 may be worth a shot. It'll give up some output and power handling to the SAN214.50 but it's $310

 

https://www.parts-express.com/LaVoce-SAN214.50-21-Neodymium-Subwoofer-8-Ohm-293-732

667 as of now to be exact, if if go with the LaVoce, what would be my  limiter settings, i saw a guy who put a 60hz signal in to it and with an RMS fluke AC meter , he adjusted until the voltage was what he want, then adjusted the limiter so no matter how much you raised the fader on the mixer mains, you never go above  whatever voltage you agree with.

On 4/13/2022 at 9:28 AM, jay michael said:

I cant speak for the 18tbx100 option but I have some thoughts on the amplifiers you listed. I have powered my Skrams using the CVR's, a Powersoft K10, an Admark k420 and Wasi w15k's. All of these amps work great and will give similar results. I would rate the CVR, K10 and Wasi so close in performance I doubt you could tell the difference between them in a blind test. Some people have stated that they think the Admark may have a slight advantage over the cvr on tone but I haven't experienced any evidence to support this, but I have only played around with their 4 channel models vs their 2 channel models. I don't think you can go wrong with any of those options.

Hey Jay,

thanks for the reply

do you have any experience with Sanway ?

and.. AYyyyy https://reverb.com/item/19924547-xta-dpa-100-dual-amplifier-with-xta-processing

those are not in my league for now, what would be a decent limiter, i have an old Driverack PA, not the PA2, not the 260, people say that the Ashly digital have a nice limiter, but they are around 999,

i was looking maybe at a MINIDSP, no matter that you need a PC to tweak it, once is set is set it and forget it

On 11/13/2021 at 12:51 PM, jay michael said:

Have a bit of an interesting field use report for my Skrams. I recently added new processing to my system using an XTA DPA 100. It’s a pretty interesting 4 channel amp, which I am using to bi-amp my Danley sh46 cabs. It also featured 4 channels of output control to add processing to my slave sub amplifiers. I used the information within this XTA/MC2 document on limiters to set up protection on my sub amps. 
 

https://audiocore.wpengine.com/wp-content/uploads/2018/05/XTA-Application-Note-DPA-Amps-Limiter-Settings.doc.pdf

using the chart within this document it says to set up the 21sw152 at 86.9 volts for limiting, minus 1db for safety margin. Having always been a little hesitant on knowing just how hard I can safely drive my Skrams I added a 2 wire thermocoupler temperature sensing system to 1 of the cabinets to monitor magnet temperature. 1 wire is mounted on the external circumference of the magnet, the other right next to the vent on the end of the magnet body. 
 

last night I provided sound for a local dubstep crew, 7 hours of continuous deep sine wave bass. Peak volume was held for about the 3 final hours of the night, at maximum I was running about 2db down from where limiting would engage.  Monitoring throughout the night, magnet temperature peaked at 44 degrees Celsius. This was also in a packed sweaty room that was raining condensation from the roof. 
 

pretty interesting to get some real Information about what the drivers are doing deep within the skram cabinets under real world conditions. I had previously come across a statement from Bennet Prescott who works with B&C saying that the 21sw152 can sustain 100 degrees magnet temperature without thermally damaging the coil. Previously I had been limiting these drivers to around 50 volts, it seems that in the Skram alignment we should be able to safely push them beyond that a bit without getting too much temperature build up. This of course may change for other types of music, I will continue to report back when I can speak to temps I’m seeing when doing other types of music shows. Data is beautiful. 
 

Always a pleasure getting to flex these cabinets, in a town where double 18’s rule,  the Skrams are raisins eyebrows and making lots of new fans. 

Thanks for sharing , that XTA pdf is pure gold!! never seen that detailed setup instructions for limiters, and btw, prices for drivers now are trough the roof, i wish have seen this thread in 2019

I just found this thread and get hooked in to it! , i have a couple of questions tough, 

is it possible to modify a little to fit 2 12" drivers or 4 8"? , take my questions

with a grain of salt or 2 i dont have any sub design knowledge

budget 18" drivers like the 18TBX100 possible ?

does anybody  had tested the clones like Sanway, sinbosen and CVR 

https://www.ebay.com/itm/275253000470?epid=12031073806&hash=item40165b7916:g:MHcAAOSwrY5iS0mr

Best.

Rolo.