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

4-way with dual 21", dual 15" & dual 8" + TPL-150. An IBWWMTM...
4-way with dual 21", dual 15" & dual 8" + TPL-150. An IBWWMTM...
4-way with dual 21", dual 15" & dual 8" + TPL-150. An IBWWMTM... 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 21st January 2020, 10:58 PM   #51
mark100 is offline mark100  United States
diyAudio Member
 
Join Date: Dec 2010
fwiw, Gain staging solved any hiss i had with the DA8 with very high sensitivity bms coax CD's.

another fwiw, QSC amps work, great value especially the used CX series, exceptional manufacturer support .....my strong preference over Crown
  Reply With Quote
Old 22nd January 2020, 12:22 AM   #52
Brett is offline Brett
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Quote:
Originally Posted by Fenalaar View Post
You will be much better off withva NanoDigi and 4 external dacs.
Do you have a suggestion for something decent, not expensive and easy to implement with the NanoDigi now they don't sell the Curryman?
  Reply With Quote
Old 22nd January 2020, 10:47 AM   #53
ZACC is offline ZACC  Sweden
diyAudio Member
 
ZACC's Avatar
 
Join Date: Mar 2005
Location: Gothenburg, Sweden
Second test box glued. This is for one of the 15" midwoofers.
43 x 43 x 43 cm. 30 mm MDF, internal volume 50.65L. This will result in a net volume of about 46L. 2 per side, one 15" in each. Simulations below with Qtc 0,486 show that we are about 5dB down at 100Hz.

Since the crossover between 21" and 15" will be at 80Hz, I think this might work. Question is, what amp will do the job best. Time will tell


15 box.jpg

CB Response Beyma 15P80FeN 46L.gif

CB Impedance Beyma 15P80FeN 46L.gif
__________________
Artificial Intelligence usually beats natural stupidity.
  Reply With Quote
Old Yesterday, 03:58 PM   #54
ZACC is offline ZACC  Sweden
diyAudio Member
 
ZACC's Avatar
 
Join Date: Mar 2005
Location: Gothenburg, Sweden
Question

I'm thinking about changing direction in this build and take the boxes out of the equation completely!

What about building Open Baffle midbass and midrange?
Would that work with these drivers?

The low octaves (21") are already up and running in my IB so that works, check.

80 - 300 Hz in an open baffle with 2 x Beyma 15P80Fe/N, what would the baffle need to be in width? Height? I've not had the time to read up on that yet (OB noob) so I'm just throwing this question out there to see if some OB specialist might answer...

The speakers will stand about 100 - 120 cm from the front wall, side walls are meters away.

From 300 Hz upwards should be alright in any baffle width...

Or... maybe no baffle needed at all? Just attach the drivers to something sturdy and be done with it.
__________________
Artificial Intelligence usually beats natural stupidity.
  Reply With Quote
Old Yesterday, 05:05 PM   #55
Scott L is offline Scott L  United States
diyAudio Member
 
Join Date: Dec 2008
Location: Knoxville, TN
4-way with dual 21", dual 15" & dual 8" + TPL-150. An IBWWMTM...
Quote:
Originally Posted by ZACC View Post
Question

I'm thinking about changing direction in this build and take the boxes out of the equation completely!

What about building Open Baffle midbass and midrange?
Would that work with these drivers?

The low octaves (21") are already up and running in my IB so that works, check.

80 - 300 Hz in an open baffle with 2 x Beyma 15P80Fe/N, what would the baffle need to be in width? Height? I've not had the time to read up on that yet (OB noob) so I'm just throwing this question out there to see if some OB specialist might answer...

The speakers will stand about 100 - 120 cm from the front wall, side walls are meters away.

From 300 Hz upwards should be alright in any baffle width...

Or... maybe no baffle needed at all? Just attach the drivers to something sturdy and be done with it.
Consider this: 80Hz is a 14 foot wavelength. Just how is it, a limited baffle size could support such a wave? Then there's the question of the negative phase back wave meeting your positive pressure wave from the infinite baffle bass. There will be some overlap at and near the crossover point.

I already built an exotic 4 way system, including infinite baffle bass. Never, even for a microsecond, did I consider anything termed, "open baffle".
  Reply With Quote
Old Yesterday, 05:40 PM   #56
Brett is offline Brett
diyAudio Member
 
Brett's Avatar
 
Join Date: Jan 2002
Quote:
Originally Posted by Scott L View Post
Never, even for a microsecond, did I consider anything termed, "open baffle".
Same. I'm 2x21, 2x15 and Unity/ch.

Never heard an OB/omni I even remotely liked, so be sure you hear one you love first. It's also not as easy to get right as you think and you need to be able to have the speakers well off the front wall to work well.
  Reply With Quote
Old Yesterday, 08:08 PM   #57
Adhoc1 is offline Adhoc1
diyAudio Member
 
Join Date: Apr 2012
I have no experience of OB speakers so maybe I shouldn't respond at all but as your room is as large as L 14,5 x W 5,5 m (L 47,5' x W 15,8'), you should have more room distances to "play around with" than many others. Where you want / need to place your sofa should have an impact too of course.

ps if you show up the DIY meeting in Mölnlycke April 4-5, you could ask / get some advice about OBs from Solhaga. He used to have 3x15" / channel (AE's TD15) as OB-speakers. (His new giant AMTs are something really extra ...) HiFiForum.nu - DIY-träff 4 & 5 april i Mölnlycke - utställare

Last edited by Adhoc1; Yesterday at 08:24 PM.
  Reply With Quote
Old Today, 08:37 AM   #58
ZACC is offline ZACC  Sweden
diyAudio Member
 
ZACC's Avatar
 
Join Date: Mar 2005
Location: Gothenburg, Sweden
Quote:
Originally Posted by Scott L View Post
I already built an exotic 4 way system, including infinite baffle bass. Never, even for a microsecond, did I consider anything termed, "open baffle".
After some studies I understand that it's not that easy to get an OB right.
Care to tell me more about your exotic 4 way system?
__________________
Artificial Intelligence usually beats natural stupidity.
  Reply With Quote
Old Today, 08:40 AM   #59
ZACC is offline ZACC  Sweden
diyAudio Member
 
ZACC's Avatar
 
Join Date: Mar 2005
Location: Gothenburg, Sweden
Quote:
Originally Posted by Brett View Post
Same. I'm 2x21, 2x15 and Unity/ch.

Never heard an OB/omni I even remotely liked, so be sure you hear one you love first. It's also not as easy to get right as you think and you need to be able to have the speakers well off the front wall to work well.
I have never listened properly to an OB so that would be a good place to start.
More info on your 2x21, 2x15 and Unity/ch?
__________________
Artificial Intelligence usually beats natural stupidity.
  Reply With Quote
Old Today, 08:44 AM   #60
ZACC is offline ZACC  Sweden
diyAudio Member
 
ZACC's Avatar
 
Join Date: Mar 2005
Location: Gothenburg, Sweden
Quote:
Originally Posted by Adhoc1 View Post
ps if you show up the DIY meeting in Mölnlycke April 4-5, you could ask / get some advice about OBs from Solhaga. He used to have 3x15" / channel (AE's TD15) as OB-speakers. (His new giant AMTs are something really extra ...) HiFiForum.nu - DIY-träff 4 & 5 april i Mölnlycke - utställare
Thanks for the tip on DIY meeting. I have to check my calendar, seems interesting. I'm guessing you're going?
__________________
Artificial Intelligence usually beats natural stupidity.
  Reply With Quote

Reply


4-way with dual 21", dual 15" & dual 8" + TPL-150. An IBWWMTM...Hide 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
Which is the best "sounding" ground connection from PCBs to chassis for a dual mono ygg-it Solid State 0 5th July 2018 11:49 AM
Modding Dual Casstte Deck for tape-less "pass through" ncdrawl Analogue Source 1 9th May 2017 06:27 AM
2-channel regular ground, dual mono or "balanced"/bridged? Neutrality Headphone Systems 19 31st March 2013 01:54 AM
TannoyFS: Monitor Gold 10 Dual Concentric Drivers "IIILZ" cm7 Swap Meet 1 23rd July 2012 07:40 PM
12AX7 dual triode "Signal Enhancer/Conditioner" sampleaccurate Tubes / Valves 2 17th March 2011 05:23 PM


New To Site? Need Help?

All times are GMT. The time now is 12:19 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki