Speakerplans.com Homepage
Forum Home Forum Home > Plans > New Projects Forum
  New Posts New Posts RSS Feed - APEX2181
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

APEX2181

 Post Reply Post Reply Page  <1 56789 27>
Author
Message
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7810
Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 4:00pm
As i have said, you have a lot to learn yet.
Take a read on the Ultra festival that has just finished in Miami. Most of the systems were tuned down to 25Hz. And few stages had double 18 reflex boxes doing that. So you are wrong.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
Back to Top
apexaudio View Drop Down
Registered User
Registered User
Avatar

Joined: 22 September 2010
Status: Offline
Points: 208
Post Options Post Options   Thanks (0) Thanks(0)   Quote apexaudio Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 5:09pm
Originally posted by MarjanM MarjanM wrote:

As i have said, you have a lot to learn yet.
Take a read on the Ultra festival that has just finished in Miami. Most of the systems were tuned down to 25Hz. And few stages had double 18 reflex boxes doing that. So you are wrong.

25Hz -10dB with EQ
Mile Slavkovic
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7810
Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 5:17pm
Really?




Edited by MarjanM - 24 March 2013 at 5:18pm
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
Back to Top
apexaudio View Drop Down
Registered User
Registered User
Avatar

Joined: 22 September 2010
Status: Offline
Points: 208
Post Options Post Options   Thanks (0) Thanks(0)   Quote apexaudio Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 6:22pm
There is no picture, but as I read BASSMAXX SP218 response is -10dB@26Hz and for d@b B2 I already post graph.

"This year I returned at the invitation of UMF Audio Chief Terry MacNeil (“Dr. Bassenstein”) to perform alignment work on systems as a couple of the stages.

In particular, a lot of attention gets paid to the subwoofers - there’s a lot of content below 50 Hz, and the subs need to be as “right” as possible. Unfortunately, festival scheduling issues restricted my efforts to a fairly tight window..

Advance Work
The PA vendor for both the main stage and Bayfront stage was Beach Sound . The main stage would be equipped with 32 d&b audiotechnik J8/J12, 16 d&b J-Sub subwoofers flown along the J8s, and 24 d&b B2 subs in three high CSA stacks, four stacks per side.

In addition, BASSMAXX supplied 16 beta test subwoofers currently given the model designation SP218 or the “Dub-ill 18.” These are double 18-inch direct radiating vented subs. The challenge would be integrating the centered BASSMAXX subs with the B2s flanking them."





Edited by apexaudio - 24 March 2013 at 6:33pm
Mile Slavkovic
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7810
Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 6:51pm
Yes that is true, but that is a single box response of BASSMAXX SP218, and boxes used at ultra are MLM218 which are completely different then SP218, and has -3db at 25Hz with -10 being at 20Hz.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
Back to Top
apexaudio View Drop Down
Registered User
Registered User
Avatar

Joined: 22 September 2010
Status: Offline
Points: 208
Post Options Post Options   Thanks (0) Thanks(0)   Quote apexaudio Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 9:38pm
Looks like MLM218 use Yamaha procesing on PA subwoofer Smile

"Advanced YST II Brings You Super Bass
The effectiveness of Advanced YST II (Yamaha Active Servo Technology II) is based upon two principles: the Helmholtz Resonator and negative-impedance drive. 

How does it work? Advanced Yamaha Active Servo Technology (Advanced YST) uses an Active Servo Processing amplifier circuit to achieve zero impedance so the speaker unit has a more linear motion, resulting in tighter bass reproduction and minimizing distortion because everything in the subwoofer moves together smoothly. 

In Advanced YST II, an Advanced Negative Impedance Converter enables the speaker cone to be driven with even tighter control--it can dynamically adjust in order to select the optimum values for speaker impedance variation. The result is more stable and accurate low range response, as well as higher sound pressure levels, for more natural and energetic bass reproduction. "


Mile Slavkovic
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7810
Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 9:53pm
No it uses the Powersoft IPAL technology.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
Back to Top
Ody View Drop Down
Registered User
Registered User


Joined: 20 December 2011
Status: Offline
Points: 36
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ody Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 11:19pm
undefined
What about Coda sc8 sc4 they claim also impressive results as ipal technology in terms of freq responce and group delay between Ultralowfrew and upperlowfreq and they manage to do it in really small enclosures.
  • 2 x Coda Audio 18” extreme high output subwoofer
  • Velocity sensors for feedback loop control
  • Extended frequency range down to 20 Hz (-6 dB), 25 Hz (-3 dB)
  • Ultra low distortion
  • Fast transient response, the upper and the ultra low frequency are time aligned
  • Compact size for reduced labor and transport costs
http://www.codaaudio.com/products/subwoofers/sc-sensor-controlled-subwoofers/sc4/sc4-overview/
Back to Top
apexaudio View Drop Down
Registered User
Registered User
Avatar

Joined: 22 September 2010
Status: Offline
Points: 208
Post Options Post Options   Thanks (0) Thanks(0)   Quote apexaudio Quote  Post ReplyReply Direct Link To This Post Posted: 24 March 2013 at 11:41pm
We go off topic, I do not want discussion about equipments for rental. I give some ideas for new diy projects anybody can use it or leave it, I do not want advertising any brand.
Regards
Mile Slavkovic
Back to Top
MarjanM View Drop Down
Old Croc
Old Croc
Avatar

Joined: 10 February 2005
Location: Macedonia
Status: Offline
Points: 7810
Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2013 at 12:06am
Apex, we do love discussing new technologies here. Understanding the technology can really help in any DIY projects. 

Edited by MarjanM - 25 March 2013 at 12:07am
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
Back to Top
Ody View Drop Down
Registered User
Registered User


Joined: 20 December 2011
Status: Offline
Points: 36
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ody Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2013 at 12:14am
Fair enough mate. Really no intetion on advertising stuff. Its just that technologies like the yamaha you metioned or ipal or sencor controlled they really move in a progressive and alternative way pushing the boundaries. And as the Diy audio community have contribute in signifacant levels in the progression of audio systems design it can be only a good think when new technologies fall on the table of discussion even if they are a bit off topic.

Cheers and respect for the effort and spirit you put in your work.
Back to Top
apexaudio View Drop Down
Registered User
Registered User
Avatar

Joined: 22 September 2010
Status: Offline
Points: 208
Post Options Post Options   Thanks (0) Thanks(0)   Quote apexaudio Quote  Post ReplyReply Direct Link To This Post Posted: 25 March 2013 at 12:28am
Originally posted by Ody Ody wrote:

Fair enough mate. Really no intetion on advertising stuff. Its just that technologies like the yamaha you metioned or ipal or sencor controlled they really move in a progressive and alternative way pushing the boundaries. And as the Diy audio community have contribute in signifacant levels in the progression of audio systems design it can be only a good think when new technologies fall on the table of discussion even if they are a bit off topic.

Cheers and respect for the effort and spirit you put in your work.

It's not advertising if you explan basic princip and use some brand product as example.
Cheers
Marjan I like your idea to made symmetrical scoops.

Mile Slavkovic
Back to Top
 Post Reply Post Reply Page  <1 56789 27>

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.06
Copyright ©2001-2023 Web Wiz Ltd.

This page was generated in 0.078 seconds.