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

Multi-Way Conventional loudspeakers with crossovers

Ultimate Open Baffle Gallery
Ultimate Open Baffle Gallery
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 11th April 2019, 04:12 AM   #2651
perceval is offline perceval  Taiwan
diyAudio Member
 
perceval's Avatar
 
Join Date: Feb 2014
Location: Taiwan
Indeed! Looks great. Nice design, and I also believe it would score WAF points.

But, if you are already using the miniDSP, why do you need the T-Bass circuit?
  Reply With Quote
Old 11th April 2019, 07:03 AM   #2652
bzfcocon is offline bzfcocon  Romania
diyAudio Member
 
Join Date: Mar 2006
Location: Bucharest
Thanks !

Quote:
Originally Posted by perceval View Post
But, if you are already using the miniDSP, why do you need the T-Bass circuit?
This has been a long and heated debate in the original T-Bass thread, with Graham arguing that T-Bass does something you cannot do with EQ alone, namely compensating the time-domain transient response of the large woofer + amplifier combo. The details are in 'T'-bass drive for OB LF drivers.

Personally, I do feel that there is somethig audible to it, so I'm using it together with miniDSP.
__________________
I don't believe in audio believings.
  Reply With Quote
Old 11th April 2019, 08:23 AM   #2653
perceval is offline perceval  Taiwan
diyAudio Member
 
perceval's Avatar
 
Join Date: Feb 2014
Location: Taiwan
Thanks,

I'll have a read over there, but time and phase alignment could be done using RePhase and the FIR filter import in the miniDSP.
  Reply With Quote
Old 11th April 2019, 09:10 PM   #2654
korpberget is offline korpberget  Norway
diyAudio Member
 
Join Date: Mar 2016
Location: Lillehammer
Bzfcocon do you have a schematic or some values for your T-bass circuit?
Read the whole tread. Tempted to do a test myself.

Big caps must also be bipolar, right?
  Reply With Quote
Old 11th April 2019, 09:42 PM   #2655
bzfcocon is offline bzfcocon  Romania
diyAudio Member
 
Join Date: Mar 2006
Location: Bucharest
Quote:
Originally Posted by korpberget View Post
Bzfcocon do you have a schematic or some values for your T-bass circuit?
The schematic is on the first page of the thread. For the Beta 15As I use the following values:
L = 6.8 ohm, 0.26 ohm ferrite core
R1, R1 = 1 ohm
C = 330uF (bipolar) - I am cutting higher
Transformes are toroids, 250 VA 2x 18V (only the secondary is used)

I don't use the low pass filter on the right part of the schematic - that is optional and can be replaced by DSP/crossover.

Warning: you MUST use a 4 ohm capable amplifier. The impedance of the assembly is low. But it does not have to be an expesive one and you don't need a lot of power: with OB you typically run out of Xmax long before you run out of power. I'm using a good old HK 620 and it does the job just great (even at somewhat higher SPLs)
__________________
I don't believe in audio believings.

Last edited by bzfcocon; 11th April 2019 at 09:48 PM.
  Reply With Quote
Old 17th April 2019, 11:51 AM   #2656
korpberget is offline korpberget  Norway
diyAudio Member
 
Join Date: Mar 2016
Location: Lillehammer
Thanx! Trying it out now. NAD C270. Sorry for treadjacking.
  Reply With Quote
Old 6th May 2019, 04:05 PM   #2657
Elnag is offline Elnag  Germany
diyAudio Member
 
Elnag's Avatar
 
Join Date: Oct 2018
Location: Hirschberg an der Bergstrasse
Current and fourth setup after almost four years playing around with open baffle. Line Array Dipole with Corner Woofer. Satisfied for now but final? You never know...

Dipol Width
Dipolplus - Alles über offene Schallwände

Sparse line array
So gehts: Line-Array dimensionieren - Visaton Diskussionsforum
Golomb ruler - Wikipedia

Corner dipole woofer
Corner Dipole Woofer (CDW): info? anyone tried one?

Linearray
8 x Visaton SL7.13
SL 713 - 4 Ohm | Visaton
No power or frequency tapering
Baffle 1840 x 80 x 5 mm - Steel

Corner Woofer
OmnesAudio OBW1506 - 15inch open baffle woofer
8 ohm Qts 1.0, Xmax 12 mm, Sd 835 cm2
Baffle 600 x 600 x 28 mm - Solid beech glued

Active Crossover
Woofer Line Array X-over at 250Hz
Reckhorn DSP-6
https://reckhorn.com/frequenzweichen...frequenzweiche
Attached Images
File Type: jpg dipolv4_all.jpg (412.3 KB, 501 views)
File Type: jpg dipolv4_back.jpg (373.0 KB, 498 views)
File Type: jpg dipolv4_corner_woofer.jpg (509.3 KB, 492 views)
File Type: jpg dipolv4_right_side.jpg (488.2 KB, 481 views)
File Type: jpg line_array_listening_pos.JPG (90.0 KB, 464 views)
File Type: jpg reckhorn_curves.JPG (196.1 KB, 151 views)
  Reply With Quote
Old 17th May 2019, 08:37 PM   #2658
MITsound is offline MITsound  Canada
diyAudio Member
 
MITsound's Avatar
 
Join Date: Jul 2013
Location: Burnaby
Ultimate Open Baffle Gallery
Default Open Frame speaker

Finally had time to finish these, excepting a grill. I'm leaning towards a string one, similar in principle to the Sonus Faber looks. The wood is Acacia, oiled, with a Peerless compression driver in a 511B Altec Lansing horn.
Woofers are Celestion 1525e .
Active crossovers, 1800, and 80 hertz for now, to a sealed 1ft3 cabinet, with a Dayton RSS265HF-4.
Assembling another sub, identical, because 80 hertz is a little low to fill the no baffle bass limits of the 15" woofers.
100-120 hertz sounds much better, but makes the sub easily locatable.
Attached Images
File Type: jpg IMG_20190517_132510.jpg (660.3 KB, 104 views)
__________________
"Aim above morality. Be not simply good; be good for something." HD Thoreau
  Reply With Quote
Old 17th May 2019, 08:43 PM   #2659
heinz1964 is offline heinz1964  Denmark
diyAudio Member
 
Join Date: Jan 2007
Default Better woofers

MIT

Would it not be better to invest in some woofers with a larger Xmax?

The Celestion 1525e has only +/- 3.25 mm

regards

uwe
  Reply With Quote
Old 17th May 2019, 09:03 PM   #2660
MITsound is offline MITsound  Canada
diyAudio Member
 
MITsound's Avatar
 
Join Date: Jul 2013
Location: Burnaby
Ultimate Open Baffle Gallery
Quote:
Originally Posted by heinz1964 View Post
MIT

Would it not be better to invest in some woofers with a larger Xmax?

The Celestion 1525e has only +/- 3.25 mm
Thanks, but I've been a fan of sub sat combos since I had the S100B/V125 Miller Kreisel pairings decades ago.
My intent here is controlled directivity, with dipoles and horns, along with placing the bass transducers where they sound best. In my room, that puts the sub in a front corner, and the satellites about 3 feet from the sidewalls, and about 5 feet from the front wall.
The other objectives are high efficiency for the satellites, to go with my baby class a amps, about 10 watts a channel, and the lowered Doppler distortion that comes with low excursion woofers.
So far so good.
__________________
"Aim above morality. Be not simply good; be good for something." HD Thoreau
  Reply With Quote

Reply


Ultimate Open Baffle GalleryHide 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
Open baffle or no baffle for nearfield full range monitors? mdevelde Full Range 19 18th November 2016 04:26 PM
Ultimate Open baffle for tannoy red 15 inch murphythecat8 Full Range 20 30th January 2013 12:29 AM
Upwards aligned open baffle? ( pop box meets open baffle ) OllBoll Full Range 3 28th March 2011 01:00 AM


New To Site? Need Help?

All times are GMT. The time now is 01:01 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki