Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

My New Line Array--It's a Modified CBT24
My New Line Array--It's a Modified CBT24
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th October 2017, 07:46 AM   #11
wesayso is offline wesayso  Netherlands
diyAudio Member
 
wesayso's Avatar
 
Join Date: Jul 2007
Can't wait to see the rest of this journey. What kind of EQ is planned?
Hopefully some FIR experiments along the way?
__________________
Use Science to design your speakers and they will sound like a piece of Art...
  Reply With Quote
Old 26th November 2017, 11:14 AM   #12
Dr1v3n is offline Dr1v3n  United States
diyAudio Member
 
Join Date: Mar 2017
Location: Wake Forest, NC
Any progress Jim?
  Reply With Quote
Old 26th November 2017, 07:12 PM   #13
Jim Griffin is offline Jim Griffin  United States
diyAudio Member
 
Join Date: Jun 2003
Location: Tennessee
Enclosures are in for painting and sub woofers boxes are in work as well. All this is slower than I wanted. I have the internal wiring (3 strings per side for each of the 3 banks) ready for insertion when the boxes are finished.

Thanks for asking.
  Reply With Quote
Old 27th November 2017, 01:35 PM   #14
HankF is offline HankF  United States
diyAudio Member
 
Join Date: Oct 2007
Location: Austin, Texas
Progress is progress. I'm in the process of ordering a couple of Rythmik F12G subs.
  Reply With Quote
Old 15th December 2017, 10:12 AM   #15
Jim Griffin is offline Jim Griffin  United States
diyAudio Member
 
Join Date: Jun 2003
Location: Tennessee
Almost two weeks ago my CBT24 cabinets completed their six weeks visit to the auto body shop for painting. The results are exceptional! The Nebla Gray Pearl paint looks terrific. While dark gray in low lighting, they have highlights when in a brightly lit room or under a spotlight.

I completed the assembly and the wiring process over the last several days. I had pre-built the 3 wiring harnesses for each speaker (each speaker has 3 shading or weighting banks) with 6 different wire colors. The harnesses eased the process plus polarized connector clips and labels helped to prevent any mistakes.

My first listen to the arrays was two days ago. I’m listening in my living room which is 23 feet wide by 32 feet long with a ceiling height that extends to an apex of 18 feet across the center of the room. A Marantz 1602 (50 watts at 8 ohms) receiver currently powers the arrays. Though the arrays have a 4 ohms nominal impedance, this light weight receiver seems to be able to do the job for now. Two 10 inch subs are positioned beside the equipment cabinet which is centered between the CBTs. The sub crossover to the CBTs at 120 Hz while the CBTs have their F3 point near 130 Hz. No equalization for my initial listening.

CBTs have the characteristics preached by Don Keele in his many CBT papers which detail the theory behind their constant beamwidth and constant directivity behavior. They feature near constant coverage cross the sound stage and near constant volume level from front to back within the room. Keele states that a CBT is essentially time aligned and linear phase. A CBT array forms a virtual point source with extremely uniform broadband directional coverage of the CBT.

My first observations are that my CBTs have a real ‘jump’ factor with an easy musical pace. I hear sounds that we didn’t hear during earlier listening sessions with different speakers on these same recordings. I can sit on axis to one array and clearly hear sounds emitted by the other array so their imaging is impressive across the sound stage! Uniformity of the radiation sound from front to back and side to side is there in spades.

I'll have lots of photos and I will post them later.

Jim

Last edited by Jim Griffin; 15th December 2017 at 10:18 AM.
  Reply With Quote
Old 15th December 2017, 10:27 AM   #16
Omholt is offline Omholt  Norway
diyAudio Member
 
Omholt's Avatar
 
Join Date: Jun 2009
My New Line Array--It's a Modified CBT24
Looking forward to pictures Jim :-)
Sounds like you have a great room, spacious.
  Reply With Quote
Old 15th December 2017, 10:54 AM   #17
dziemian is offline dziemian  Poland
diyAudio Member
 
Join Date: Jun 2012
Location: Gdansk
I am eager to see the photos too.
  Reply With Quote
Old 15th December 2017, 09:16 PM   #18
Jim Griffin is offline Jim Griffin  United States
diyAudio Member
 
Join Date: Jun 2003
Location: Tennessee
Try this link to a Modified CBT24 Gallery:

Modified CBT24 - Google Photos
  Reply With Quote
Old 15th December 2017, 10:33 PM   #19
Dr1v3n is offline Dr1v3n  United States
diyAudio Member
 
Join Date: Mar 2017
Location: Wake Forest, NC
They look great Jim! I imagine you still have to listen at lower levels to break in the drivers? I don't think 50 watts is going to cut it at louder levels.
  Reply With Quote
Old 16th December 2017, 08:02 AM   #20
wesayso is offline wesayso  Netherlands
diyAudio Member
 
wesayso's Avatar
 
Join Date: Jul 2007
I'd think the 50 watt will be more than enough as the bottom end is supported by subs.
__________________
Use Science to design your speakers and they will sound like a piece of Art...
  Reply With Quote

Reply


My New Line Array--It's a Modified CBT24Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
CBT24 line array speakers jayce996 Multi-Way 81 24th August 2017 08:39 PM
30 Driver CBT Line array 30 Fountek FE87 driversper array T85matt Planars & Exotics 3 26th December 2016 06:51 PM
Short Line Array (line source) build perceval Full Range 226 4th January 2015 02:08 PM
Help with converting sealed box line array loudspeaker to transmission line enclosure jb0194 Multi-Way 3 7th January 2012 05:08 AM
t-line subs for a DIY line array tom1356 Multi-Way 17 28th December 2002 12:15 AM


New To Site? Need Help?

All times are GMT. The time now is 05:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki