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 1 
 on: Today at 10:21:09 am 
Started by Griffen Behm - Last post by Peter Morris
That design has more to do with fitting the drivers in the cabinet than any acoustical performance.

You have to think in terms of wavelengths.  At the wavelengths the cabinet is intended to operate, the dimensions of the "clamshell" are simply to small to make any difference.

A general rule is 1/4 wavelength or larger to make any difference.  Since 50Hz is around 20' long, 1/4 wavelength is 5'.  So things 5' or larger would matter.  The distances in the clamshell are no where near that.

Well ... you will get a bit of gain from the loading caused by the slot, it will behave like a 6th order band pass with one section tuned to about 200Hz and the other 35Hz ... think in terms of 2 - 3 dB at 100Hz and 7 dB at 200Hz

Here is the frequency response plot of the SB1000 and a SIM of a double 18 reflex (grey)  and with a similar sized slot (black)

 2 
 on: Today at 10:09:36 am 
Started by James Paul - Last post by George Friedman-Jimenez
0 to 60 under 2.9 seconds (for the 3 motor version) sounds like there may be some interest among folks who habitually disregard speed limits and don't mind ugly. The flat surfaces look like they were designed to reduce the radar scattering cross section to evade highway radar, so we may have a pending public health problem on our hands. Maybe they should have a built in cockpit breath alcohol detector with a power cutoff switch.

 3 
 on: Today at 09:45:30 am 
Started by brian maddox - Last post by Bill Meeks

I like pfSense and recommend it, I have heard that a major rewrite is either in progress or moved to a testing branch.  I did however go over to the dark side and convert our Ubiquity network with a host of open source thread detection and response tools to a Fortinet solution for better BGP support, centralized config, update and backup management and better threat assessment libraries. 


Only thing I do on FreeBSD is ZFS NAS boxes for virtual machine storage.

The current RELEASE version of pfSense (2.4.5_p1) is based on FreeBSD-11.3/STABLE. The DEVEL version (2.5) is based on FreeBSD-12.1/STABLE. The GUI is PHP with Bootstrap HTML for now.

I have used pfSense privately for years. In my professional vocation I managed Checkpoint firewalls for years. Right as I was retiring my employer made a switch to Palo Alto for most firewalls although there were still some Checkpoints around. I created and now maintain the Suricata package for pfSense, and I took over maintenance of the Snort package on pfSense several years ago.

 4 
 on: Today at 09:33:24 am 
Started by CThompson - Last post by CThompson
We have an Ri8-D connected to an M7CL via SWP1. A single channel on the Ri8-D is producing a pronounced hissing.
  • Ive unplugged all XLR connectors
  • Ive restarted all devices
  • Ive reset all Ethernet cables
  • ive turned off phantom power to the channel
  • Ive turned off all processing on the channel including EQ, gating, and compression
  • Ive tried routing the channel to a different input on the board

After doing the above, the hiss is still present. I believe itís an issue with the Ri8 but I wanted to see if anyone else had come across this problem and what the solution was.

 5 
 on: Today at 09:30:22 am 
Started by Griffen Behm - Last post by Ivan Beaver
i think the clamshell design benefits from the long side against the ground...should couple better.
That design has more to do with fitting the drivers in the cabinet than any acoustical performance.

You have to think in terms of wavelengths.  At the wavelengths the cabinet is intended to operate, the dimensions of the "clamshell" are simply to small to make any difference.

A general rule is 1/4 wavelength or larger to make any difference.  Since 50Hz is around 20' long, 1/4 wavelength is 5'.  So things 5' or larger would matter.  The distances in the clamshell are no where near that.

 6 
 on: Today at 09:22:24 am 
Started by Yoel Klein - Last post by Ivan Beaver
Correct. 
My room is not treated on the floor where a sub would go. it is treated in the middle position.
4" thick rock-board-40 and a 2" gap away from the walls. It's not the most fancy decoration but it surly does the job.
A little bit of spacing (like you have) away from the wall is a good thing.

It extends the effectiveness of the panels down lower.

I tell people when doing treatments (absorption) in a room, try to at least use some furring strips (3/4"), but more is better, to a certain point.

 7 
 on: Today at 09:00:36 am 
Started by Eric Baker - Last post by Eric Baker
So I would like to say the tops are great! Boxes are very solid! But I'm not happy at all about not having these settings. Is it stopping me from using them no! But, I have sent him several times since I placed the order back in May asking for settings. I understand people get busy and forget things. No big deal, but I have emailed him at least 4 times asking for them. He has always replied to the emails, but never has once said anything about the settings. I have even called and talked to him about sending me the setting. He did seems very busy/distracted when I had him on the phone. So I sent him a email after the fact. From what other people say online he is a great guy and very helpful. I have not seen this at all when I called he did not seem to want to give me the time of day. So maybe he will see this and send me a receipt for my purchase and some processor settings. The last email I will ever send him was over ten day ago. With no reply!

 8 
 on: Today at 08:02:22 am 
Started by James Paul - Last post by Mike Monte
FWIW: My QU-16 and QU-24 have been rock solid for me - zero issues.

 9 
 on: Today at 07:50:48 am 
Started by James Paul - Last post by Chris Hindle
^^^  This.  My local PAC losing the Soundcraft Venue II is a spectacular PSU melt down, a PM-3000 hum that turned out to be from severe voltage drop, witnessed H3K automation run amok and will note that the Paragon II's native state was with the bottom covers removed...
Back in Ye Old Days, there was a reason "we" carried dual power supplies on a switcher, NOT plugged in at the same time, and a "lesser status" board for when a HK, PM, SC or whatever "Big Boy Board" got a little upset...
I did a high profile gig on my MC-2404 when we couldn't take the time to troubleshoot the PM-3K "noises".
The broadcast truck was..... ahhh. more than a little surprised at that one....

This new day of quite capable digital boards, wow. You youngins should have been around when a "real" console took 6 guys to lift....
Chris.

 10 
 on: Today at 05:09:49 am 
Started by Helge A Bentsen - Last post by Helge A Bentsen
BTW, booting the bottom octave in favor of subs and running 2220s instead of 2226s made for much better sounding boxes with a crossover at 1k into the HF driver.

Thanks.
I have a pair of BMS 4590 around that should fit on the 2380 horn.
Aiming for a crossover around 5-700hz, need to do some measurements and see what's possible.

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